TY - JOUR T1 - Insolation effects on the lunar hydrogen budget; correlated observations of the Lunar Reconnaissance Orbiter's LEND, LOLA and Diviner instruments AN - 1668231483; 2015-027233 AB - In this research we correlate the Lunar Reconnaissance Orbiter's (LRO), Diviner radiometer temperature maps that characterize the Moon's thermal environment with maps derived from the Lunar Exploration Neutron Detector (LEND) and Lunar Orbiting Laser Altimeter (LOLA). In previous research, we found evidence that the Moon's Hydrogen budget was broadly influenced by insolation effects. In that analysis we implemented a transformation of LOLA's topography maps, thereby isolating poleward-facing and equator-facing slopes. We then integrated the LEND epithermal neutron maps over these regions and found that the epithermal neutron count rates were significantly lower in poleward-facing slopes vs. equivalent equator-facing slopes, yielding a localized "epithermal contrast". This result suggests higher H/H (sub 2) O concentrations in poleward-facing slopes vs. comparable equator-facing slopes. It is also consistent with findings in terrestrial and Martian environments indicating similar H/H (sub 2) O slope contrasts. In support of that finding we determined that the epithermal neutron rates over east and west-facing slopes were as predicted equivalent. The above effects were also similar for both North and South Poles. Together, this support indicated surface insolation is an important factor governing the Moon's Hydrogen budget. Temperature effects of insolation are primarily a function of a cosine process a = i cos theta , which predicts the effective solar irradiation a, incident to a given surface as a function of its angular orientation theta , to the source solar irradiation, i. theta is locally a function of several variables including combined: seasonal, diurnal, topographic, latitude and regolith compositional effects which induces locally dependent and time variable temperature conditions. The Moons low obliquity and increased latitude predictably attenuate solar irradiation, which is well correlated with decreased near-surface temperatures towards the poles. Importantly, topographic variance is also a critical factor in theta , that influences a slopes relative orientation to the incident solar irradiation thus inducing localized illumination and temperature conditions. At a given lunar latitude, these factors yield a localized temperature continuum. The temperature differential or 'contrast' between localized poleward-facing and equator-facing slopes approximates the temperature range of this continuum. We extend this research by integrating the Diviner radiometer temperature maps to this analysis. In this effort we will perform a correlative analysis to identify and quantify the temperature contrast between pole-facing and equator-facing slopes used in the LEND analysis. This will allow us to determine the relative contribution of insolation factors e.g. latitude, slope degree and orientation to the poleward direction on epithermal neutron fluences and the Hydrogen budget. JF - American Geophysical Union Fall Meeting AU - McClanahan, Timothy P AU - Mitrofanov, I AU - Boynton, W V AU - Litvak, M AU - Milikh, G M AU - Evans, Larry G AU - Starr, Richard D AU - Livengood, Timothy A AU - Chin, Gordon AU - Harshman, Karl AU - Droege, G AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P43B EP - 1921 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668231483?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Insolation+effects+on+the+lunar+hydrogen+budget%3B+correlated+observations+of+the+Lunar+Reconnaissance+Orbiter%27s+LEND%2C+LOLA+and+Diviner+instruments&rft.au=McClanahan%2C+Timothy+P%3BMitrofanov%2C+I%3BBoynton%2C+W+V%3BLitvak%2C+M%3BMilikh%2C+G+M%3BEvans%2C+Larry+G%3BStarr%2C+Richard+D%3BLivengood%2C+Timothy+A%3BChin%2C+Gordon%3BHarshman%2C+Karl%3BDroege%2C+G%3BAnonymous&rft.aulast=McClanahan&rft.aufirst=Timothy&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Results from the Lunar Reconnaissance Orbiter Mission and plans for the extended science mission AN - 1668231082; 2015-027223 AB - The Lunar Reconnaissance Orbiter spacecraft (LRO), launched on June 18, 2009, began with the goal of seeking safe landing sites for future robotic missions or the return of humans to the Moon as part of NASA's Exploration Systems Mission Directorate (ESMD). In addition, LRO's objectives included the search for surface resources and the measurement of the lunar radiation environment. After spacecraft commissioning, the ESMD phase of the mission began on September 15, 2009 and was completed on September 15, 2010 when operational responsibility for LRO was transferred to NASA's Science Mission Directorate (SMD). The SMD mission was scheduled for 2 years and completed in September of 2012. Under SMD, the Science Mission focused on a new set of goals related to understanding the history of the Moon, its current state, and what it can tell us about the evolution of the Solar System. Having recently marked the completion of the two-year Science Mission, we will review here the major results from the LRO for both exploration and science and discuss plans and objectives for the Extended Science that will last until September, 2014. Some results from the LRO mission are: the development of comprehensive high resolution maps and digital terrain models of the lunar surface; discoveries on the nature of hydrogen distribution, and by extension water, at the lunar poles; measurement of the daytime and nighttime temperature of the lunar surface including temperature down below 30 K in permanently shadowed regions (PSRs); direct measurement of Hg, H (sub 2) , and CO deposits in the PSRs; evidence for recent tectonic activity on the Moon; and high resolution maps of the illumination conditions at the poles. JF - American Geophysical Union Fall Meeting AU - Keller, John W AU - Vondrak, Richard R AU - Petro, Noah E AU - Chin, Gordon AU - Garvin, J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P43B EP - 1911 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668231082?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Results+from+the+Lunar+Reconnaissance+Orbiter+Mission+and+plans+for+the+extended+science+mission&rft.au=Keller%2C+John+W%3BVondrak%2C+Richard+R%3BPetro%2C+Noah+E%3BChin%2C+Gordon%3BGarvin%2C+J%3BAnonymous&rft.aulast=Keller&rft.aufirst=John&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Testing of lunar permanently shadowed regions for water ice; LEND results for about three years of observations AN - 1668230422; 2015-027230 AB - More than 50 years ago, it was suggested that some areas near the lunar poles are sufficiently cold to trap and preserve for a very long time ( approximately Gy) hydrogen bearing volatiles, either primordial or produced at the Moon via solar wind interactions or brought to the Moon as water ice by comets and meteoroids [1,2]. The results of observations made by radar onboard the Clementine spacecraft and by neutron (LPNS) and gamma-ray (LPGRS) spectrometers onboard the Lunar Prospector mission have been interpreted as an enhancement of hydrogen abundance in permanently shadowed regions (PSRs) [3]. Unfortunately, the spatial resolution of these instruments were much broader than the size of any largest PSRs [4] requiring model dependent data deconvolution to resolve signal from PSRs itself. Data Analysis: We would like to present updated results of analysis of Lunar Exploration Neutron Detector (LEND) data for about three years of lunar mapping. Data measured by collimated LEND detectors allows one to look at neutron flux distribution at Moon poles with much better spatial resolution then was achieved at previous space missions. Using the LEND data we had tested the hypothesis that all PSRs are contain a large amount of water ice permafrost and test for hydrogen presents in regolith of regions outside of PSRs. Discussion: Both analyses of individual PSRs and studies of groups of PSRs have shown that these spots of extreme cold at lunar poles are not associated with a strong effect of epithermal neutron flux suppression [5]. We found only three large PSRs, Shoemaker and Cabeus in the South and Rozhdestvensky U in the North, which manifest significant neutron suppression, from -5.5% to -14.9%. All other PSRs have much smaller suppression, no more than few percentages, if at all. Some PSRs even display excess of neutron emission in respect to sunlit vicinity around them. Testing PSRs collectively, we have not found any average suppression for them. Only group of 18 large PSRs, with area >200 km (super 2) , show a marginal effect of small average suppression, approximately 2%, with low statistical confidence. A approximately 2% suppression corresponds to approximately 125 ppm of hydrogen taking into account the global neutron suppression near the lunar poles and assuming a homogeneous Hydrogen distribution in depth in the regolith [6]. References: [1] Arnold, J. R. (1979) JGR, 84, 5659-5668. [2] Watson, K., Murray B. C. and Brown H. (1961) JGR, 66, 3033-3045. [3] Feldman W. C. et al. (2001) JGR, 106, 23231-23252. [4] Maurice S. et al. (2004) JGR, 109, E07S04, 40 PP. [5] Mitrofanov I. G. et al. (2010) Science, 330, 483. [6] Sanin A.B. et al. (2012) JGR, 117, E00H26 JF - American Geophysical Union Fall Meeting AU - Sanin, A AU - Mitrofanov, I AU - Litvak, M AU - Boynton, W V AU - Chin, Gordon AU - Evans, Larry G AU - Garvin, J AU - Golovin, D AU - Harshman, Karl AU - McClanahan, T R AU - Malakhov, A AU - Milikh, G M AU - Sagdeev, R AU - Starr, Richard D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P43B EP - 1918 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668230422?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Testing+of+lunar+permanently+shadowed+regions+for+water+ice%3B+LEND+results+for+about+three+years+of+observations&rft.au=Sanin%2C+A%3BMitrofanov%2C+I%3BLitvak%2C+M%3BBoynton%2C+W+V%3BChin%2C+Gordon%3BEvans%2C+Larry+G%3BGarvin%2C+J%3BGolovin%2C+D%3BHarshman%2C+Karl%3BMcClanahan%2C+T+R%3BMalakhov%2C+A%3BMilikh%2C+G+M%3BSagdeev%2C+R%3BStarr%2C+Richard+D%3BAnonymous&rft.aulast=Sanin&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Water ice permafrost at lunar poles; observational evidence from LEND instrument onboard LRO AN - 1668230158; 2015-027232 AB - Lunar Exploration Neutron Detector (LEND) of LRO measured the flux of epithermal neutrons with high spatial resolution of 10 km for the amplitude of 50 km. The LEND data from the polar caps above 80 degree latitude were tested for the presence of local spots of epithermal Neutron Suppression Regions (NSRs) [1, 2]. Six such spots have been found, five at South pole and one at North pole. One of them, NSR S4 in the Cabeus crater, has been suggested, as the best impact site for direct evaluation of the content of lunar volatiles, including the water, by LCROSS instruments [3]. And indeed, a lot of water has been found in the plume, corresponding to 5.6 +/- 2.4 weight % [4]. Another interesting spot NSR S1 is identified with the crater Shoemaker, which PSR perfectly coincides with the contour of the strong neutron suppression. It was shown [5] that there is very good agreement between the profile of the crater depth and the decrease of the flux of epithermal neutrons. Concluding the LEND data analysis of NSRs, one may present two main results: (1) Only two of NSRs are associated with PSRs (Cabeus and Shoemaker), another large PSRs do not manifest a signature of local neutron suppression. (2) There are several NSRs, which have surface illuminated by Sun light. These results could be interpreted by the model of water ice perma-frost, which suggest that NSRs are associated with spots with permanently cold regolith with stable water ice in the porosity volume. In PSRs, the ice bearing layer is the upper most one. If the surface of NSR is periodically illuminated, the ice bearing layer should lie below the top layer of ice-free regolith. During a night, the cold top layer absorbs water molecules from the exosphere (still illuminated nearby hills could be source of these molecules). During a day, the top layer is heated, and water molecules diffuse from the porosity volume into the both directions: upward to exosphere, and downward to the cold layer of permafrost. Such pumping process might depend on local conditions (presence of heated slops nearby, local density of water molecules, depth of permanently cold layer, surface albedo, etc.): therefore, a spot of water ice permafrost might exist in one particular environment, and might not exist in another one. The question should be understood, what is the origin of the water of lunar permafrost. The model has been discussed (i.e. see [5]) that water could be delivered to the Moon by comets. When comets impact with the lunar surface, the vapor of cometary water from the temporal atmospheres condenses at either at temporal or permanent cold traps at poles. Another model has been proposed (i.e. see [5]), which explains the origin of water by chemical reactions between hydrogen of solar wind with oxygen of lunar regolith. The so-called solar water could be produced at the sunlit surface, and than migrate at permanent or temporal cold traps in the local vicinity from the irradiated spot of origin. References: [1] Mitrofanov I. et al. (2010), Science, 330, 483-486. [2] Mitrofanov I. et al. (2012), JGR-Planets, v.117, CiteID E00H27. [3] Colaprete A. (2010), Science, 330, 463. [4] Boynton W. et al. (2012), 43rd LPSC, Abstract#1659. [5] Vondrak R.R. and Crider D.H. (2003), American Scientist, 91, 322-329. [6] Mazarico E. (2011), Icarus, 211, 2, 1066 - 1081. JF - American Geophysical Union Fall Meeting AU - Mitrofanov, I AU - Sanin, A AU - Litvak, M AU - Boynton, W V AU - Chin, Gordon AU - Evans, Larry G AU - Garvin, J AU - Harshman, Karl AU - McClanahan, T R AU - Milikh, G M AU - Sagdeev, R AU - Starr, Richard D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P43B EP - 1920 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668230158?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Water+ice+permafrost+at+lunar+poles%3B+observational+evidence+from+LEND+instrument+onboard+LRO&rft.au=Mitrofanov%2C+I%3BSanin%2C+A%3BLitvak%2C+M%3BBoynton%2C+W+V%3BChin%2C+Gordon%3BEvans%2C+Larry+G%3BGarvin%2C+J%3BHarshman%2C+Karl%3BMcClanahan%2C+T+R%3BMilikh%2C+G+M%3BSagdeev%2C+R%3BStarr%2C+Richard+D%3BAnonymous&rft.aulast=Mitrofanov&rft.aufirst=I&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Bistatic radar observations of the Moon using the Arecibo Observatory & Mini-RF on LRO AN - 1668228660; 2015-027231 AB - The Mini-RF team is acquiring bi-static radar measurements that will test the hypothesis that permanently shadowed areas near the lunar poles contain water ice. These bistatic observations (where the Arecibo Observatory Planetary Radar (AO) transmits a 12.6 cm wavelength signal, which is reflected off of the lunar surface and received by the Mini-RF instrument on LRO) have produced the first lunar non beta-zero radar images ever collected. Rationale: Typically, orbital radar observations use the same antenna to both transmit and receive a signal. The angle between the transmitted and received signals (the bistatic, or beta angle) for these observations is therefore zero, and they are referred to as monostatic observations. By using the AO radar as the transmitter and Mini-RF as the receiver, we have the opportunity to collect data for the Moon with beta angles other than zero. These measurements provide a new and unique test of the water ice hypothesis for the Moon. A common science product produced using planetary radar is the Circular Polarization Ratio (CPR). CPR is the ratio of the powers of received signal in the same sense transmitted divided by the opposite sense. Typical dry lunar surface has a CPR value less than unity. Higher CPR signals can result from multiple-bounce backscatter from rocky surfaces or from the combined volume scattering and coherent backscatter opposition effects (CBOE) from an ice/regolith mixture. The physics of radar scattering predict that high CPR caused by a rocky surface will be relatively insensitive to the beta angle, whilst high CPR caused by ice will be very sensitive to beta, with elevated CPR values dropping off abruptly at beta angles greater than about 1-2 degrees . Mini-RF monostatic data shows many craters with high CPR values. Most of these features are associated with fresh, young craters and display elevated CPR both inside and outside their rims. Some permanently shadowed craters near both poles show elevated CPR inside the crater rims but low CPR outside the crater rim. This has been interpreted as being consistent with RF backscatter caused by surface roughness in the former case and water ice in the latter. We are imaging both po-lar, and non-polar targets that have high monostatic CPR values. By acquiring non beta zero data of equatorial high-CPR regions (which we can safely assume have high CPR due to the presence of surface rocks) we can confirm the hypothesis that high CPR caused by rocks is reasonably invariant to the beta angle. We are looking to see if monostatic high-CPR polar craters have high or low values in the bistatic data. If we find areas that become low only in the bistatic data then this provides strong supporting evidence that these are ice deposits. Using Arecibo and Mini-RF we are acquiring the first ever planetary bistatic radar images at non beta =0 angles. These data provide a unique new piece of evidence to determine if the Moon's polar craters contain ice. JF - American Geophysical Union Fall Meeting AU - Bussey, B AU - Schulze, R AU - Wahl, D AU - Patterson, Gerald W AU - Nolan, M C AU - Jensen, R AU - Turner, Scott AU - Yocky, D AU - Cahill, Joshua T AU - Jakowatz, J AU - Carter, Lynn M AU - Neish, Catherine AU - Spudis, P AU - Raney, R Keith AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P43B EP - 1919 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668228660?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Bistatic+radar+observations+of+the+Moon+using+the+Arecibo+Observatory+%26amp%3B+Mini-RF+on+LRO&rft.au=Bussey%2C+B%3BSchulze%2C+R%3BWahl%2C+D%3BPatterson%2C+Gerald+W%3BNolan%2C+M+C%3BJensen%2C+R%3BTurner%2C+Scott%3BYocky%2C+D%3BCahill%2C+Joshua+T%3BJakowatz%2C+J%3BCarter%2C+Lynn+M%3BNeish%2C+Catherine%3BSpudis%2C+P%3BRaney%2C+R+Keith%3BAnonymous&rft.aulast=Bussey&rft.aufirst=B&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Filling gaps in the spatial coverage of LOLA terrain models AN - 1668228562; 2015-027237 AB - The Lunar Orbiter Laser Altimeter (LOLA) aboard the Lunar Reconnaissance Orbiter (LRO) has collected over 5.6 billion measurements of surface height with a vertical precision of approximately 10 cm and an accuracy of approximately 1 m. The ability of LOLA to obtain measurements under uniform illumination conditions and in shadowed regions provides an advantage over passive stereoscopic imaging, particularly at high latitudes (> 60 deg) where imaging is hindered by low solar incidence angles. This has allowed LOLA to produce the highest resolution and most accurate polar terrain models to date. However, due to LRO's polar orbit, gaps in the LOLA coverage as wide as approximately 4 km still exist near the equator. Here we present preliminary results of efforts to fill in gaps in LOLA coverage with targeted off-nadir spacecraft slews and by incorporating an independently-derived terrain model into the data post-processing. Recently, the Terrain Camera (TC) aboard the SELENE (Kaguya) spacecraft produced a global digital elevation model (DEM) from stereo imaging with 10-m spatial posting. The TC DEM is a highly complimentary dataset with which to augment the LOLA dataset. We show that the TC DEM can be registered to the LOLA geodetic framework yielding a root-mean-square elevation residual of a few meters. The goal of this work is to produce the most complete global terrain model of the lunar surface by merging both high-resolution datasets while preserving the accuracy of the LOLA data. JF - American Geophysical Union Fall Meeting AU - Barker, Michael K AU - Mazarico, E AU - Neumann, Gregory A AU - Torrence, Mark H AU - Mao, D AU - Jha, Kopal AU - Golder, James AU - Zuber, M T AU - Smith, David E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P43B EP - 1926 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1668228562?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Filling+gaps+in+the+spatial+coverage+of+LOLA+terrain+models&rft.au=Barker%2C+Michael+K%3BMazarico%2C+E%3BNeumann%2C+Gregory+A%3BTorrence%2C+Mark+H%3BMao%2C+D%3BJha%2C+Kopal%3BGolder%2C+James%3BZuber%2C+M+T%3BSmith%2C+David+E%3BAnonymous&rft.aulast=Barker&rft.aufirst=Michael&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-04-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Evidence for a collective dusty plasma at Enceladus AN - 1664439339; 2015-024965 AB - During the numerous passages of Cassini past Saturn's moon, Enceladus, the Langmuir probe on the Radio and Plasma Wave Science (RPWS) system detected two unusual features: 1) An extended region north and south of the moon having a dropout in electron concentration to levels at or below 10% that of the ambient magnetoplasma, and 2) within the southern gas and ice plume, an unexpectedly large increase in ion density. During these passages, the RPWS radio system was detecting dust grain impacts, these having peak flux levels within the plumes. We demonstrate that the Langmuir probe electron observations are confirmed by changes in the plasma waves, especially the local upper hybrid frequency. While the increase in plume ions appears anomalous, we present a scenario to explain the large concentrations. We will demonstrate that the observed dropout in electrons is best explained by the presence of a large concentration of submicron grains, and we will then discuss new implications associated with such a collective dusty-plasma system. JF - American Geophysical Union Fall Meeting AU - Farrell, W M AU - Wahlund, J AU - Morooka, M AU - MacDowall, R J AU - Gurnett, Donald A AU - Kurth, William S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P34C EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664439339?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Evidence+for+a+collective+dusty+plasma+at+Enceladus&rft.au=Farrell%2C+W+M%3BWahlund%2C+J%3BMorooka%2C+M%3BMacDowall%2C+R+J%3BGurnett%2C+Donald+A%3BKurth%2C+William+S%3BAnonymous&rft.aulast=Farrell&rft.aufirst=W&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Contribution of SELENE-2 geodetic measurements to constrain the lunar internal structure AN - 1664439019; 2015-024972 AB - Internal structure and composition of the Moon provide important clue and constraints on theories for how the Moon formed and evolved. The Apollo seismic network has contributed to the internal structure modeling. Efforts have been made to detect the lunar core from the noisy Apollo data (e.g., [1], [2]), but there is scant information about the structure below the deepest moonquakes at about 1000 km depth. On the other hand, there have been geodetic studies to infer the deep structure of the Moon. For example, LLR (Lunar Laser Ranging) data analyses detected a displacement of the lunar pole of rotation, indicating that dissipation is acting on the rotation arising from a fluid core [3]. Bayesian inversion using geodetic data (such as mass, moments of inertia, tidal Love numbers k (sub 2) and h (sub 2) , and quality factor Q) also suggests a fluid core and partial melt in the lower mantle region [4]. Further improvements in determining the second-degree gravity coefficients (which will lead to better estimates of moments of inertia) and the Love number k (sub 2) will help us to better constrain the lunar internal structure. Differential VLBI (Very Long Baseline Interferometry) technique, which was used in the Japanese lunar exploration mission SELENE (Sept. 2007 - June 2009), is expected to contribute to better determining the second-degree potential Love number k (sub 2) and low-degree gravity coefficients. SELENE will be followed by the future lunar mission SELENE-2 which will carry both a lander and an orbiter. We propose to put the SELENE-type radio sources on these spacecraft in order to accurately estimate k (sub 2) and the low-degree gravity coefficients. By using the same-beam VLBI tracking technique, these parameters will be retrieved through precision orbit determination of the orbiter with respect to the lander which serves as a reference. The VLBI mission with the radio sources is currently one of the mission candidates for SELENE-2. We have conducted a preliminary simulation study on the anticipated k (sub 2) accuracy. With the assumed mission duration of about 3 months and the arc length of 14 days, the k (sub 2) accuracy is estimated to be better than 1%, where the uncertainty is evaluated as 10 times the formal error considering the errors in the non-conservative force modeling and in the lander position. We carried out a feasibility study using Bayesian inversion on how well we can constrain the lunar internal structure by the geodetic data to be improved by SELENE-2. It will be shown that such improved geodetic data contribute to narrow the range of the plausible internal structure models, but there are still trade-offs among crust, mantle, and core structures. Preliminary simulation results will be presented to show that the accuracy of core structure estimation will be improved in consequence of better determination of the mantle structure by combining the geodetic data with the seismic data. References [1] Weber et al. (2011), Science, 331, 309-312, doi:10.1126/science.1199375 [2] Garcia eta l. (2011), PEPI, doi:10.1016/j.pepi.2011.06.015 [3] Williams et al. (2001), JGR, 106, E11, 27,933-27,968 [4] Khan and Mosegaard (2005), GRL, 32, L22203, doi:10.1029/2005GL023985 JF - American Geophysical Union Fall Meeting AU - Matsumoto, K AU - Kikuchi, Fuyuhiko AU - Yamada, R AU - Iwata, Takahiro AU - Kono, Yusuke AU - Tsuruta, S AU - Hanada, H AU - Goossens, S J AU - Ishihara, Yoshiaki AU - Kamata, S AU - Sasaki, S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P41A EP - 1880 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664439019?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Contribution+of+SELENE-2+geodetic+measurements+to+constrain+the+lunar+internal+structure&rft.au=Matsumoto%2C+K%3BKikuchi%2C+Fuyuhiko%3BYamada%2C+R%3BIwata%2C+Takahiro%3BKono%2C+Yusuke%3BTsuruta%2C+S%3BHanada%2C+H%3BGoossens%2C+S+J%3BIshihara%2C+Yoshiaki%3BKamata%2C+S%3BSasaki%2C+S%3BAnonymous&rft.aulast=Matsumoto&rft.aufirst=K&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Modal mineralogy of lunar soils AN - 1664433992; 2015-024995 AB - Modal mineralogy of the lunar regolith is fundamentally important. It varies with the composition of underlying bedrock, extent of addition of materials excavated by impact both local and distant, and small-scale reworking by micrometeorite bombardment, so it contains information about local geological history. Determining modal mineralogy of soils provides vital ground truth to remote sensing studies. Mineralogy can be determined by a variety of techniques that provide complementary information: X-Ray Diffraction (XRD), optical point counting, element mapping by scanning electron microscopy (SEM) or electron microprobe (EMP), and normative calculation from a bulk chemical analysis. SEM and EMP element mapping can be converted into mineral modal abundances in a variety of ways, including defining compositional windows for specific minerals and using image processing techniques. XRD provides direct determination of the phases present, but gives little information about the chemical composition of those phases. We have launched a project to determine the modal mineralogy of over 100 lunar soils from all Apollo sites. The goal is to use this quantitative mineralogy and laboratory and remote reflectance spectra of the same soils to improve our ability to extract quantitative mineralogy from remote sensing data. Samples (< 1 mm bulk soils) were dry-sieved and the <150 micron fractions analyzed in a Terra XRD instrument (InXitu, Inc.) using sample sizes of approximately 35 mg. We reduced the data using Reitveld refinement as implemented by the Jade program (Materials Data, Inc.). Glass abundances were determined by choosing a linear background and fitting a broad Gaussian to the scattering hump above background. Quantitative XRD is well established, but usually requires some calibration, in spite of the sophisticated Reitveld refinement and whole-pattern fitting. We calibrated the instrument by using mixtures of terrestrial minerals and results from the Lunar Sample Characterization Consortium (data available at web.utk.edu/ approximately pgi/data.html). Without calibration our results differ (though by < 10% relative) from those of the LSCC. Discrepancies may stem from the uncertainties in assigning a pixel to a specific mineral in the SEM point counting approach, not completely randomized orientations of the mineral grains during analysis by Terra, or shock effects in minerals not being taken into account by the Reitveld method. Data for 30 soils from the Apollo 16 site show that on a glass-free basis plagioclase ranges from 78 to 94 wt%, with the sites on the Descartes Mountains (Stations 4, 11, and 13) tending to contain more plagioclase, consistent with previous conclusions that the Descartes highlands are more feldspathic than the Cayley Plains. The relative abundance among mafic silicates varies throughout the site, although the small abundance of the mafic components leads to uncertainty in the Reitveld analysis. Particularly interesting for using the combination of remote sensing and sample measurements is the observation that modal plagioclase is systematically greater than normative plagioclase (normative/modal plagioclase is 0.83 to 0.95). A difference between modes and norms is not unusual, but this substantial difference indicates that the glass in the Apollo 16 regolith is more mafic than the crystalline material, consistent with the average composition of impact glass in Apollo 16 samples compared to bulk soils. JF - American Geophysical Union Fall Meeting AU - Taylor, J AU - Martel, Linda AU - Lucey, P G AU - Crites, S T AU - Blake, David F AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P41C EP - 05 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664433992?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Modal+mineralogy+of+lunar+soils&rft.au=Taylor%2C+J%3BMartel%2C+Linda%3BLucey%2C+P+G%3BCrites%2C+S+T%3BBlake%2C+David+F%3BAnonymous&rft.aulast=Taylor&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Long-lasting science returns from the Apollo heat flow experiments AN - 1664433990; 2015-025003 AB - The Apollo astronauts deployed geothermal heat flow instruments at landing sites 15 and 17 as part of the Apollo Lunar Surface Experiments Packages (ALSEP) in July 1971 and December 1972, respectively. These instruments continuously transmitted data to the Earth until September 1977. Four decades later, the data from the two Apollo sites remain the only set of in-situ heat flow measurements obtained on an extra-terrestrial body. Researchers continue to extract additional knowledge from this dataset by utilizing new analytical techniques and by synthesizing it with data from more recent lunar orbital missions such as the Lunar Reconnaissance Orbiter. In addition, lessons learned from the Apollo experiments help contemporary researchers in designing heat flow instruments for future missions to the Moon and other planetary bodies. For example, the data from both Apollo sites showed gradual warming trends in the subsurface from 1971 to 1977. The cause of this warming has been debated in recent years. It may have resulted from fluctuation in insolation associated with the 18.6-year-cycle precession of the Moon, or sudden changes in surface thermal environment/properties resulting from the installation of the instruments and the astronauts' activities. These types of re-analyses of the Apollo data have lead a panel of scientists to recommend that a heat flow probe carried on a future lunar mission reach 3 m into the subsurface, approximately 0.6 m deeper than the depths reached by the Apollo 17 experiment. This presentation describes the authors' current efforts for (1) restoring a part of the Apollo heat flow data that were left unprocessed by the original investigators and (2) designing a compact heat flow instrument for future robotic missions to the Moon. First, at the conclusion of the ALSEP program in 1977, heat flow data obtained at the two Apollo sites after December 1974 were left unprocessed and not properly archived through NASA. In the following decades, heat flow data from January 1975 through February 1976, as well as the metadata necessary for processing the data (the data reduction algorithm, instrument calibration data, etc.), were somehow lost. In 2010, we located 450 original master archival tapes of unprocessed data from all the ALSEP instruments for a period of April through June 1975 at the Washington National Records Center. We are currently extracting the heat flow data packets from these tapes and processing them. Second, on future lunar missions, heat flow probes will likely be deployed by a network of small robotic landers, as recommended by the latest Decadal Survey of the National Academy of Science. In such a scenario, the heat flow probe must be a compact system, and that precludes use of heavy excavation equipment such as a rotary drill for reaching the 3-m target depth. The new heat flow system under development uses a pneumatically driven penetrator. It utilizes a stem that winds out of a reel and pushes its conical tip into the regolith. Simultaneously, gas jets, emitted from the cone tip, loosen and blow away the soil. Lab experiments have demonstrated its effectiveness in lunar vacuum. JF - American Geophysical Union Fall Meeting AU - Nagihara, S AU - Taylor, Patrick T AU - Williams, Dave R AU - Zacny, K AU - Hedlund, M AU - Nakamura, Y AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P42A EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664433990?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Long-lasting+science+returns+from+the+Apollo+heat+flow+experiments&rft.au=Nagihara%2C+S%3BTaylor%2C+Patrick+T%3BWilliams%2C+Dave+R%3BZacny%2C+K%3BHedlund%2C+M%3BNakamura%2C+Y%3BAnonymous&rft.aulast=Nagihara&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Returning samples from Enceladus AN - 1660633574; 2015-018357 AB - From the first half century of space exploration, we have obtained samples only from the Moon, comet Wild 2, the Solar Wind and the asteroid Itokawa. The in-depth analyses of these samples in terrestrial laboratories have yielded profound knowledge that could not have been obtained without the returned samples. While obtaining samples from Solar System bodies is crucial science, it is rarely done due to cost and complexity. Cassini's discovery of geysers on Enceladus and organic materials, indicate that there is an exceptional opportunity and science rational to do a low-cost flyby sample return mission, similar to what was done by the Stardust. The earliest low cost possible flight opportunity is the next Discovery Mission [Tsou et al 2012]. Enceladus Plume Discovery - While Voyager provided evidence for young surfaces on Enceladus, the existence of Enceladus plumes was discovered by Cassini. Enceladus and comets are the only known solar system bodies that have jets enabling sample collection without landing or surface contact. Cassini in situ Findings - Cassini's made many discoveries at Saturn, including the break up of large organics in the plumes of Enceladus. Four prime criteria for habitability are liquid water, a heat source, organics and nitrogen [McKay et al. 2008, Waite et al. 2009, Postberg et al. 2011]. Out of all the NASA designated habitability targets, Enceladus is the single body that presents evidence for all four criteria. Significant advancement in the exploration of the biological potential of Enceladus can be made on returned samples in terrestrial laboratories where the full power of state-of-the-art laboratory instrumentation and procedures can be used. Without serious limits on power, mass or even cost, terrestrial laboratories provide the ultimate in analytical capability, adaptability, reproducibility and reliability. What Questions can Samples Address? - Samples collected from the Enceladus plume will enable a thorough and replicated search for chemical biosignatures to understand the habitability potential of the subsurface ocean of Enceladus [Glavin et al. 2011]. By assessing the chiral excess among different amino acids, identifying chains of amino acids, isolate distinct sequences of these chains and the same for nucleic acids, we can formulate a new set of hypotheses to address some of the key science questions required for investigating the stage of extraterrestrial life at Enceladus beyond the four factors of habitability. Criticality of Analyses - For extraterrestrial organic matter analyses such as chirality and compound-specific isotopes, the repeatable robustness of laboratory measurements is a necessity. These analyses require a series of chemical extraction and derivatization steps prior to analysis that is adapted to the sample and procedures results-driven. The Stardust mission is an excellent example of the challenges in the analysis of organics. Confirmation of the cometary origin of the amino acid glycine from comet Wild 2 was obtained 3 years after the samples were returned to Earth. This long period of laboratory development allowed several modifications to the extraction protocol, multiple analytical techniques and instrumentations. Reference: Tsou et al., Astrobiology, in press 2012. McKay et al. Astrobiology 2008. Waite et al. Nature V 460 I 7254, 2009. Postberg et al. EPSC 642P 2011. Glavin et al., LPSC, #5002, 2011. JF - American Geophysical Union Fall Meeting AU - Tsou, Peter AU - Kanik, Isik AU - Brownlee, D AU - McKay, C AU - Anbar, A D AU - Glavin, Daniel AU - Yano, H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P33A EP - 1920 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660633574?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Returning+samples+from+Enceladus&rft.au=Tsou%2C+Peter%3BKanik%2C+Isik%3BBrownlee%2C+D%3BMcKay%2C+C%3BAnbar%2C+A+D%3BGlavin%2C+Daniel%3BYano%2C+H%3BAnonymous&rft.aulast=Tsou&rft.aufirst=Peter&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - The electric potential of the charged dust near the E ring AN - 1660633558; 2015-018315 AB - Recent Cassini observations revealed that the moon Enceladus expels water vapour and ice grains from its south pole and forms a plume that becomes the major source for the E ring and the surrounding neutral gas. The Enceladus' plume and dispersed neutral gas produces a large amount of ionized gas, which become a dominant plasma source for Saturn's magnetosphere. A striking feature is that small grains in the plume and in the E ring are negatively charged and electrically couples to the ambient plasma electrically. Cassini Radio and Plasma Wave Science (RPWS) measurements of the cold plasma properties observed a large ion and electron density difference (Ne/Ni < 0.01-0.5) that is associated with the micro-meter sized dust grains near Enceladus plume and the E ring region. At the same time the ion bulk speed is slowed down to near to the Keplerian speed. The conditions are such that rd << dg << D, where rd, dg and D are the typical grain radius, the inter-grain distance and the plasma Debye length, respectively, a so called "dusty plasma". Large ion and electron density differences (Ne/Ni < 1) can be actually found not only near the Enceladus plume but also in a wide area around Saturn's E ring and the plasma disc. To investigate if the charged dust is collectively coupled to the background plasma (i.e., the dusty plasma state), the electric potential of the dust is an important parameter. We use the RPWS/LP data to statistically investigate the dust electrical potential near the E ring. We will present the characteristics of the dust electric potential and discuss the dust-plasma interaction in the E ring and the plasma disc. JF - American Geophysical Union Fall Meeting AU - Morooka, M AU - Wahlund, J AU - Farrell, W M AU - Gurnett, Donald A AU - Kurth, William S AU - Persoon, A M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P31C EP - 1900 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660633558?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+electric+potential+of+the+charged+dust+near+the+E+ring&rft.au=Morooka%2C+M%3BWahlund%2C+J%3BFarrell%2C+W+M%3BGurnett%2C+Donald+A%3BKurth%2C+William+S%3BPersoon%2C+A+M%3BAnonymous&rft.aulast=Morooka&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Viewing Mercury's surface-bound exosphere from orbit; eighteen months of observations by the Mercury atmospheric and surface composition spectrometer aboard the MESSENGER spacecraft AN - 1660633255; 2015-018350 AB - Prior to the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission, Mercury's surface-bounded exosphere was known to contain H and He, observed by Mariner 10, as well as Na, K, and Ca, observed from the ground. The exosphere is the interface between the planet's surface and the surrounding space environment. Its composition and structure are controlled by interactions among the surface, magnetosphere, solar wind, sunlight, and impacting meteoroids. When species are liberated from the surface with sufficient energy, they can be accelerated by solar radiation pressure to form an anti-sunward tail. During three flybys en route to orbit, the Ultraviolet and Visible Spectrometer (UVVS) channel of the Mercury Atmospheric and Surface Composition Spectrometer (MASCS) aboard MESSENGER discovered Mg in the tail and detected Ca+ in a narrow region centered approximately 2.5 Mercury radii anti-sunward of the planet's terminator. UVVS began routine orbital observations of both the dayside and nightside exosphere on March 29, 2011. It regularly measures altitude profiles for all previously detected neutral species with the exception of He and K. The former has no emission features within the UVVS wavelength range (115-600 nm), and the latter has only one relatively weak feature there. A single component of Ca is usually observed at lower altitudes ( approximately 2000 km) and exhibits the strong equatorial, dawn enhancement observed during the flybys. Mg distributions exhibit two components. The more energetic component has been detected at high altitudes, up to 4000 km above the surface on both the dayside and nightside, and shows a dawn enhancement similar to Ca. Dayside distributions of Na exhibit two components with e-folding heights comparable to profiles above the poles obtained during the third flyby. Concentrations of all three species exhibit seasonal variability. The best studied of these is Na, for which maximum dayside density occurs at a Mercury true anomaly angle of 180 degrees . UVVS also observes H. It is less well studied than Ca, Mg, and Na because signal from the exospheric H is often contaminated by emission from interplanetary hydrogen and sunlight reflected from the surface. O has also been detected near the subsolar point, but its emission is too weak for routine study. UVVS observations also include wavelength scans for neutral species that are known or are predicted to be present in the surface materials (e.g., Si, Al, S, Mn, Fe, and OH), but emissions from these species are not sufficiently bright for detection with current operational scenarios. The UVVS team uses a variety of techniques to relate exosphere composition and structure to source processes, including tomographic inversion and Monte Carlo modeling. Correlations of Mercury's neutral exosphere composition and structure with direct measurements of the space environment from MESSENGER's Magnetometer (MAG) and Energetic Particle and Plasma Spectrometer (EPPS) provide further insight into source processes. JF - American Geophysical Union Fall Meeting AU - McClintock, William E AU - Benna, Medhi AU - Burger, Matthew H AU - Cassidy, Timothy AU - Killen, Rosemary M AU - Merkel, Aimee W AU - Sarantos, Menelaos AU - Solomon, S C AU - Sprague, A L AU - Vervack, Ron J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P32B EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660633255?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Viewing+Mercury%27s+surface-bound+exosphere+from+orbit%3B+eighteen+months+of+observations+by+the+Mercury+atmospheric+and+surface+composition+spectrometer+aboard+the+MESSENGER+spacecraft&rft.au=McClintock%2C+William+E%3BBenna%2C+Medhi%3BBurger%2C+Matthew+H%3BCassidy%2C+Timothy%3BKillen%2C+Rosemary+M%3BMerkel%2C+Aimee+W%3BSarantos%2C+Menelaos%3BSolomon%2C+S+C%3BSprague%2C+A+L%3BVervack%2C+Ron+J%3BAnonymous&rft.aulast=McClintock&rft.aufirst=William&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Mercury polar volatiles; complex hydrocarbons vs water ice AN - 1660633166; 2015-018331 AB - Radiometric measurements by MLA elucidate the emplacement and sequestration of volatiles on Mercury, repeatedly imaged by Earth-based radar. We have reported [Neumann et al., 2012, LPSC, #2651] the presence of MLA-dark deposits coinciding with many of the radar-bright regions thought to indicate the presence of subsurface ice. Thermal models [Paige et al., 2012, LPSC, #2875] suggest that at certain latitudes, maximum temperatures exceed the regime of stability of surface water ice, but average subsurface temperatures allow its persistence there against sublimation. At the highest latitudes, where radar signatures fill large portions of polar craters, measurements by MLA are at the noise limit for measuring reflectance; however, several profiles have been obtained with useful energy data. We explore the working hypothesis that dark, complex organics (common in asteroids & comets) overly water ice, providing an important constraint on thermal models of polar regions. Repeated profiles are being acquired in the extended mission in order to more clearly delineate the boundaries of volatile deposits. A good sampling of craters over the appropriate latitude range will further constrain the composition of volatiles. We will report on further mapping in the MESSENGER Extended Mission to the coldest north polar regions, where the majority of ices lie. JF - American Geophysical Union Fall Meeting AU - Neumann, G A AU - Mazarico, E AU - Zuber, M T AU - Smith, D E AU - Paige, D A AU - Solomon, S C AU - Ernst, Carolyn M AU - Barnouin, O S AU - Mao, D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P31D EP - 08 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660633166?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Mercury+polar+volatiles%3B+complex+hydrocarbons+vs+water+ice&rft.au=Neumann%2C+G+A%3BMazarico%2C+E%3BZuber%2C+M+T%3BSmith%2C+D+E%3BPaige%2C+D+A%3BSolomon%2C+S+C%3BErnst%2C+Carolyn+M%3BBarnouin%2C+O+S%3BMao%2C+D%3BAnonymous&rft.aulast=Neumann&rft.aufirst=G&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Mercury's sodium exosphere; observations during the MESSENGER orbital phase AN - 1660632254; 2015-018351 AB - The MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft entered into orbit about Mercury on March 18, 2011. We now have approximately five Mercury years of data from orbit. Prior to the MESSENGER mission, Mercury's surface-bounded exosphere was known to contain H, He, Na, K, and Ca. The Ultraviolet and Visible Spectrometer (UVVS) began routine orbital observations of both the dayside and nightside exosphere on March 29, 2011, measuring altitude profiles for all previously detected neutral species except for He and K. We focus here on what we have learned about the sodium exosphere: its spatial, seasonal, and sporadic variation. Observations to date permit delineation of the relative roles of photon-stimulated desorption (PSD) and impact vaporization (IV) from seasonal and spatial effects, as well as of the roles of ions both as sputtering agents and in their possible role to enhance the efficiency of PSD. Correlations of Mercury's neutral sodium exosphere with measurements from MESSENGER's Magnetometer (MAG) and Energetic Particle and Plasma Spectrometer (EPPS) provide insight into the roles of ions and electrons. Models incorporating MAG observations provide a basis for identifying the location and area of the surface exposed to solar wind plasma, and EPPS observations reveal episodic populations of energetic electrons in the magnetosphere and the presence of planetary He+, O+, and Na+. JF - American Geophysical Union Fall Meeting AU - Killen, Rosemary M AU - Cassidy, Timothy AU - Vervack, Ron J AU - Burger, Matthew H AU - Merkel, Aimee W AU - Sarantos, Menelaos AU - Sprague, A L AU - McClintock, William E AU - Benna, Medhi AU - Solomon, S C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P32B EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632254?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Mercury%27s+sodium+exosphere%3B+observations+during+the+MESSENGER+orbital+phase&rft.au=Killen%2C+Rosemary+M%3BCassidy%2C+Timothy%3BVervack%2C+Ron+J%3BBurger%2C+Matthew+H%3BMerkel%2C+Aimee+W%3BSarantos%2C+Menelaos%3BSprague%2C+A+L%3BMcClintock%2C+William+E%3BBenna%2C+Medhi%3BSolomon%2C+S+C%3BAnonymous&rft.aulast=Susak+Pitzer&rft.aufirst=Angela&rft.date=2015-01-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=9781321796117&rft.btitle=&rft.title=Exploring+Value+through+Roman+Glass+from+Karanis%2C+Egypt&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Crustal thickness estimates at mercury from MESSENGER line-of-sight gravity AN - 1660632076; 2015-018361 AB - The thickness of the crust on Mercury is a crucial measure for understanding the planet's interior and surface evolution. Measurements of the gravity field and topography made since the MESSENGER spacecraft entered orbit around Mercury in March 2011 can be used to estimate lateral variations in crustal thickness. Mercury Laser Altimeter measurements of topography have yielded a gridded topography model for the northern hemisphere with a grid spacing of approximately 11 km. Doppler tracking of MESSENGER's radio signal for more than 1000 orbits has permitted the determination of a spherical harmonic model of the gravity field of Mercury up to degree and order 50. This model accounts for over 90% of the signal in the observations. However, within the unmodeled signal there are line-of-site (LOS) residuals that are primarily due to the variable spatial resolution of the measurements caused by the highly eccentric orbit of the MESSENGER spacecraft. We estimate variations in crustal thickness with a localized Green's function method and compare our results with crustal thickness estimates derived from a standard spherical harmonic approach. We focus on regions of geophysical interest that are within approximately 30 degrees latitude of MESSENGER's periapsis. First, we perform a local estimation of the Bouguer anomaly by integrating a single-layer Green's function model to calculate the gravity signal at spacecraft altitude from surface topography. We project this Bouguer correction onto the instantaneous line-of-sight direction for differencing with the Doppler signal from the Radio Science Subsystem. We use this difference to invert for the relief on the crust-mantle interface, under the assumptions of no lateral variations in density, a uniform density crust, and an average crustal thickness. We demonstrate the feasibility of this approach with tests that use synthetic gravity data for fully isostatically compensated surface topography, and we examine sensitivity to mean crustal thickness. We find that inversions with LOS residual data and the approach described here can extract the maximum resolution of the crustal thickness estimates from the tracking data. JF - American Geophysical Union Fall Meeting AU - Ritzer, J A AU - Johnson, C L AU - Phillips, R J AU - Hauck, S A AU - Lemoine, Frank G AU - Mazarico, E AU - Neumann, G A AU - Smith, D E AU - Goossens, Sander J AU - Solomon, S C AU - Zuber, M T AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P33B EP - 1935 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632076?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft.genre=dissertations+%26+theses&rft.jtitle=&rft.atitle=&rft.au=Susak+Pitzer%2C+Angela+Pauline&rft.aulast=Susak+Pitzer&rft.aufirst=Angela&rft.date=2015-01-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=9781321796117&rft.btitle=&rft.title=Exploring+Value+through+Roman+Glass+from+Karanis%2C+Egypt&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Mercury's high northern latitude magnetic signature; limitations on an internal source AN - 1660632052; 2015-018360 AB - We determine minimum and maximum limits on small-scale magnetic fields of internal origin in Mercury's crust from the MESSENGER magnetic field observations. We first estimated and removed from the observed fields the contributions from Mercury's offset dipole and its magnetopause, cross-tail current, and cusp. Magnetic fields around Mercury are usually organized in coordinate systems defined by magnetic local time (external fields) or planetary longitude (internal fields). Because of Mercury's negligible obliquity, the Z-axes (i.e., perpendicular to the orbital plane or along the rotation axis) for these two systems are almost identical. From the magnetic field residuals organized in magnetic local time, we determine the average vector fields in bins of size 40' by 5 degrees . The minimum limit on remanent magnetization is set by assuming that the Z component of the residual magnetic fields are of external origin, and the maximum limit is set by assuming that those residual fields are of internal origin. The minimum limit is 11 nT at 300 km altitude, and the residuals can be described as a single feature with a center at 74 degrees N, 37 degrees E, in the vicinity of the northern rise of the Mercury's northern volcanic province. This magnetic field is deduced from both the radial and colatitudinal components of the observations, and the two components are consistent with a common source. We are investigating the robustness of this signature with respect to the range of external magnetic fields at Mercury. The spatial scale of the feature is consistent with an origin either in Mercury's crust or as a small-scale feature in Mercury's core field. If the feature originates in Mercury's crust, the field magnitude and the deduced magnetizations are substantially smaller than those associated with the largest crustal magnetic anomalies on Earth, but they are larger than crustal anomalies on the Moon. The maximum limit is substantially larger, but the magnetic fields deduced from the radial and colatitudinal components of the observation are not consistent with a single source. We conclude that most of the fields organized along the Z-axis are of external origin. JF - American Geophysical Union Fall Meeting AU - Nicholas, Jospeh B AU - Purucker, Michael E AU - Johnson, C L AU - Anderson, Brian J AU - Korth, H AU - Winslow, R M AU - Head, James W AU - Solomon, S C AU - Zuber, M T AU - Slavin, J A AU - Alexeev, I I AU - Phillips, Roger J AU - Paige, D A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P33B EP - 1934 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632052?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Mercury%27s+high+northern+latitude+magnetic+signature%3B+limitations+on+an+internal+source&rft.au=Nicholas%2C+Jospeh+B%3BPurucker%2C+Michael+E%3BJohnson%2C+C+L%3BAnderson%2C+Brian+J%3BKorth%2C+H%3BWinslow%2C+R+M%3BHead%2C+James+W%3BSolomon%2C+S+C%3BZuber%2C+M+T%3BSlavin%2C+J+A%3BAlexeev%2C+I+I%3BPhillips%2C+Roger+J%3BPaige%2C+D+A%3BAnonymous&rft.aulast=Nicholas&rft.aufirst=Jospeh&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Ground penetrating radar field studies of planetary analog geologic settings; impact ejecta, volcanics, and fluvial terrains AN - 1660632050; 2015-018376 AB - Ground-Penetrating Radar (GPR) data from terrestrial analog environments can help constrain models for evolution of the lunar and martian surfaces, aid in interpretation of orbital SAR data, and help predict what might be encountered in the subsurface during future landed scientific or engineering operations. Results and interpretations presented here from impact ejecta (Barringer Meteorite Crater), volcanic deposits (Northern Arizona cinders overlying lavas, columnar-jointed Columbia River flood basalts, Hawaii lava flows), and terrains influenced by fluvial-related activity (channeled scablands megaflood bar, Mauna Kea glacio-fluvial deposits) focus on defining the radar "fingerprint" of geologic materials and settings that may be analogous to those found on the Moon and Mars. The challenge in using GPR in geologic investigations is the degree to which different geologic features and processes can be uniquely identified and distinguished in the data. Our approach to constraining this is to qualitatively and quantitatively characterize GPR signatures of different geological environments and to compare them with "ground-truth" observations of subsurface exposures immediately adjacent or subjacent to our GPR transects. Several sites were chosen in each field area based on accessibility, visual access to the subsurface, and presence of particular geologic features of interest. The interpreted distribution of blocks in impact ejecta at Meteor Crater, using a 400 MHz antenna (wavelength of 75 cm) is 1.5-3 blocks per m (super 3) in the upper 1 m (and 0.5-1 blocks per m (super 3) in the upper two meters), which is close to the in situ measured block distribution of 2-3 blocks larger than 0.25-0.30 m per m (super 3) . This is roughly the detection limit to be expected from the lambda /3 resolution approximation of radar wavelength and indicates that the 400 MHz GPR is characterizing the block population in ejecta. While megaflood bar deposits are also reflector-rich, individual reflectors are in general more easily distinguished. At multiple sites, cinders appear smoothly, regularly layered, and allow for excellent GPR penetration. Consequently, the often rough relief of underlying lava flows is discernable, allowing thickness and volume estimates to be made, as well as giving some idea of structure within/on the buried flow. Alternations of massive and clinkery horizons within a'a' flows are detected, as are features representing the interface of overlapping pahoehoe flows (likely due to relatively high relief and fracturing associated with squeeze-ups, etc). Accumulations of gravel, pebbles, and fines derived from lavas and cinders and emplaced by alluvial and mass-wasting processes (along the margins of Apollo Valley, Mauna Kea) appear similar to the pure cinders, as it is likely the same porosity and grain-size characteristics that cause layered GPR reflections. In any case, such layers allow interpretation of how successive events filled in surface relief of the underlying (lava) substrate. GPR data of the interior fill of western Apollo Valley reveals relatively flat reflectors in the along-valley direction and inter-fingering, pinching-out, and dome- and trough-shaped reflectors in the cross-valley direction, indicating accumulation by multiple overlapping lobes coming down the valley, possibly due to multiple fluvial events over time. JF - American Geophysical Union Fall Meeting AU - Russell, P S AU - Grant, J A AU - Carter, Lynn M AU - Garry, W AU - Williams, K K AU - Morgan, Gareth A AU - Daubar, I AU - Bussey, Ben AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P33C EP - 1952 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632050?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Ground+penetrating+radar+field+studies+of+planetary+analog+geologic+settings%3B+impact+ejecta%2C+volcanics%2C+and+fluvial+terrains&rft.au=Russell%2C+P+S%3BGrant%2C+J+A%3BCarter%2C+Lynn+M%3BGarry%2C+W%3BWilliams%2C+K+K%3BMorgan%2C+Gareth+A%3BDaubar%2C+I%3BBussey%2C+Ben%3BAnonymous&rft.aulast=Russell&rft.aufirst=P&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Impact velocity as a source of variations in crater depth on Mercury AN - 1660632021; 2015-018367 AB - High-resolution images and altimetry of 115 craters obtained by the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission have been analyzed to further the understanding of the formation and subsequent modification on impact craters on Mercury. Measurements derived from altimetry include crater depth (d), rim height, central peak/ring height, and crater wall/terrace width. Images have been used to derive crater diameter (D) and to assess crater degradation state as well as the nature of any observed impact melt. Analyses of the measurements tie these geometrical parameters to the crater characteristics seen in images. An important first observation is that the freshest craters on Mercury are not necessarily the deepest, as is typically inferred in most studies of d/D ratios. Frequently, the heights of the central peak are also smaller. A good example is provided by a comparison of two peak-ring craters of similar size on Mercury: Atget (D = 102 km) and Hokusai (D = 93 km). Hokusai is extremely fresh and has few superposed craters, broadly extensive craters rays, and distal secondaries. Hokusai also possesses substantial amounts of visible impact melt and evidence for a rampart-like structure reminiscent of ejecta observed on Mars. Although not markedly altered by subsequent impacts, Atget crater is slightly older and more degraded. Atget ejecta show no obvious evidence for melt ponds in the ejecta as seen at Hokusai. The younger Hokusai has a smaller d/D value of 0.022 (d = 2.1 km) than Atget's ratio of 0.032 (d = 3.3 km). In other examples, shallower fresh craters also display a central structure with less relief than comparable but less fresh craters of similar size. The Hokusai-Atget comparison suggests that a shallower depth may be associated with a greater volume of impact melt, but calculations indicate that this increased melt volume is probably not directly responsible for the lesser depth. The observed variation in impact melt volume, as well as the difference in crater depth, could alternatively be the result of differences in impact angle, as has been proposed for craters on the Moon, but no oblique impact-angle morphologies are apparent in the data associated with these and other examples. Structural effects that might be associated with the presence of different central structures, such as a central peak ring, are unlikely to be the cause of the observed depth difference because both Atget and Hokusai have peak rings. Target variations are also unlikely to be important, because both craters are in similar volcanic terrain. The observed greater melt generated at Hokusai than at Atget is best explained by the broad range of impact velocities expected on Mercury, which can range from 15 to 75 km/s. A larger impact velocity will not only generate more impact melt volume, an indicator of higher impact velocity, but from laboratory data a higher velocity will also produce shallower transient craters that can form shallower final craters. JF - American Geophysical Union Fall Meeting AU - Barnouin, Olivier S AU - Susorney, H C AU - Ernst, Carolyn M AU - Neumann, Gregory A AU - Johnson, C L AU - Balcerski, Jeff AU - Hauck, S A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P33B EP - 1941 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632021?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Impact+velocity+as+a+source+of+variations+in+crater+depth+on+Mercury&rft.au=Barnouin%2C+Olivier+S%3BSusorney%2C+H+C%3BErnst%2C+Carolyn+M%3BNeumann%2C+Gregory+A%3BJohnson%2C+C+L%3BBalcerski%2C+Jeff%3BHauck%2C+S+A%3BAnonymous&rft.aulast=Barnouin&rft.aufirst=Olivier&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Hematite bearing ridge as evidence for anoxic water discharge in Gale Crater AN - 1656038237; 2015-014351 AB - Mars Reconnaissance Orbiter CRISM hyperspectral imaging data covering the northern flank of Mount Sharp and acquired with pixels spatially oversampled have been processed to retrieve high signal to noise single scattering albedo spectra from 0.45 to 2.6 mu m with enhanced spatial resolution. Using these data and coordinated HiRISE images, a approximately 200 m wide and 6.5 km long ridge to the north of a large channel system emanating from Mount Sharp was identified and mapped. The ridge is composed of finely layered strata dipping to the north and exhibits a strong spectral signature of crystalline hematite. To the west, the ridge transitions to an escarpment overlain by younger strata; to the east, debris flows from Mount Sharp cover and obscure the ridge. The ridge is stratigraphically directly above the clay bearing strata. We interpret the ridge to be formed by erosion associated with outflow from the channel that preferentially stripped away flanking strata not as well cemented by hematite. We hypothesize that the hematite accumulated where anoxic groundwater discharged and came into contact with an oxidizing Martian atmosphere. Anoxic water may have originated as precipitation that percolated through the mound, leaching Fe2+ from the overlying sulfate layers until encountering the clay aquiclude. Alternatively, anoxic Fe2+-rich waters at Gale could have originated by groundwater discharge near the base of the mound. In this scenario, dissolved Fe2+ could be leached from an underlying basaltic aquifer or possibly the clay layer. Given that iron oxidation reactions on Earth may be mediated by chemolithotrophic microorganisms, the ridge provides a compelling site for a detailed measurement campaign by the Mars Science Laboratory Curiosity rover. JF - American Geophysical Union Fall Meeting AU - Fraeman, A A AU - Arvidson, R E AU - Catalano, J G AU - Morris, R V AU - Murchie, S L AU - Seelos, F P AU - Seelos, K D AU - McGovern, A AU - Viviano, C E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P11B EP - 1831 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656038237?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hematite+bearing+ridge+as+evidence+for+anoxic+water+discharge+in+Gale+Crater&rft.au=Fraeman%2C+A+A%3BArvidson%2C+R+E%3BCatalano%2C+J+G%3BMorris%2C+R+V%3BMurchie%2C+S+L%3BSeelos%2C+F+P%3BSeelos%2C+K+D%3BMcGovern%2C+A%3BViviano%2C+C+E%3BAnonymous&rft.aulast=Fraeman&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Icebreaker; Mars drill and sample delivery system AN - 1656038205; 2015-014389 AB - We report on the development and testing of a one meter class prototype Mars drill and cuttings sample delivery system. The IceBreaker drill consists of a rotary-percussive drill head, a sampling auger with a bit at the end having an integrated temperature sensor, a Z-stage for advancing the auger into the ground, and a sampling station for moving the augered ice shavings or soil cuttings into a sample cup. The drill is deployed from a 3 Degree of Freedom (DOF) robotic arm. The drill demonstrated drilling in ice-cemented ground, ice, and rocks at the 1-1-100-100 level; that is the drill reached 1 meter in 1 hour with 100 Watts of power and 100 Newton Weight on Bit. This cor-responds to an average energy of 100 Whr. The drill has been extensively tested in the Mars chamber to a depth of 1 meter, as well as in the Antarctic and the Arctic Mars analog sites. We also tested three sample delivery systems: 1) 4 DOF arm with a custom soil scoop at the end; 2) Pneumatic based, and 3) Drill based enabled by the 3 (DOF) drill deployment boom. In all approaches there is an air-gap between the sterilized drill (which penetrates subsurface) and the sample transfer hardware (which is not going to be sterilized). The air gap satisfies the planetary protection requirements. The scoop acquires cuttings sample once they are augered to the surface, and drops them into an instrument inlet port. The system has been tested in the Mars chamber and in the Arctic. The pneumatic sample delivery system uses compressed gas to move the sample captured inside a small chamber integrated with the auger, directly into the instrument. The system was tested in the Mars chamber. In the third approach the drill auger captures the sample on its flutes, the 3 DOF boom positions the tip of the auger above the instrument, and then the auger discharges the sample into an instrument. This approach was tested in the laboratory (at STP). The above drilling and sample delivery tests have shown that drilling and sample transfer on Mars, in ice cemented ground with limited power, energy and Weight on Bit, and collecting samples in discrete depth intervals is possible within the given mass, power, and energy levels of a phoenix-size lander and within the duration of a phoenix-like mission. JF - American Geophysical Union Fall Meeting AU - Mellerowicz, B L AU - Paulsen, G L AU - Zacny, K AU - McKay, C AU - Glass, B J AU - Dave, A AU - Davila, A F AU - Marinova, M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P11E EP - 1881 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656038205?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Icebreaker%3B+Mars+drill+and+sample+delivery+system&rft.au=Mellerowicz%2C+B+L%3BPaulsen%2C+G+L%3BZacny%2C+K%3BMcKay%2C+C%3BGlass%2C+B+J%3BDave%2C+A%3BDavila%2C+A+F%3BMarinova%2C+M%3BAnonymous&rft.aulast=Mellerowicz&rft.aufirst=B&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Thermal infrared emission measurements of iron sulfate and phosphate samples for application to Mars AN - 1656037788; 2015-014379 AB - Iron sulfate and phosphate minerals have been identified on Mars through the integration of data from multiple instruments on the Mars Exploration Rovers (MERs). In order to more thoroughly study the MER Mini-Thermal Emission Spectrometer (Mini-TES) and Mars Global Surveyor TES data sets, suites of iron sulfate minerals and phosphate minerals have been collected; the chemistry of each sample has been verified by X-ray diffraction analysis and thermal emission spectra have been obtained. Obtaining pure, well-characterized samples has been arduous, but the spectra to be presented were acquired of chemically verified samples. Iron sulfate and phosphate minerals consist of XO4 tetrahedra (where X is S and P, respectively) polymerized with MO6 polyhedra (where M is a metal cation) in various configurations. These mid-infrared iron sulfate and phosphate spectra are dominated by features associated with the X-O vibrations of the SO4 and PO4 tetrahedra, similar to non-iron-bearing sulfates. Many of the iron sulfate chemistries studied include bound water (OH and/or H2O), hence their iron sulfate spectra exhibit a water bending feature that lies between approximately 1700 and 1630 cm (super -1) . Typically, the phosphate spectra are less hydrous. Within their mineral classes, iron sulfate and phosphate spectra exhibit similarities, which generally align by Strunz groups. These well-characterized spectra will enable further analysis of spectral data sets from Mars. JF - American Geophysical Union Fall Meeting AU - Lane, M D AU - Bishop, J L AU - Dyar, M D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P11E EP - 1871 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656037788?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Thermal+infrared+emission+measurements+of+iron+sulfate+and+phosphate+samples+for+application+to+Mars&rft.au=Lane%2C+M+D%3BBishop%2C+J+L%3BDyar%2C+M+D%3BAnonymous&rft.aulast=Lane&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - SAM-like evolved gas analysis of Mars analog samples from the Arctic Mars analog Svalbard expedition; implications for analyses by the Mars science laboratory AN - 1656037490; 2015-014407 AB - The Arctic Mars Analog Svalbard Expeditions (AMASE) have investigated a range of geologic settings on Svalbard, using methodologies and techniques being developed for Mars missions, such as the Mars Science Laboratory (MSL). The Sample Analysis at Mars (SAM) instrument suite on MSL consists of a quadrupole mass spectrometer (QMS), a gas chromatograph (GC), and a tunable laser spectrometer (TLS), which analyze gases created by pyrolysis of samples. During AMASE, a Hiden Evolved Gas Analysis-Mass Spectrometer (EGA-QMS) system represented the EGA-QMS capability of SAM. Another MSL instrument, CheMin, will use x-ray diffraction (XRD) and x-ray fluorescence (XRF) to perform quantitative mineralogical characterization of samples. Field-portable versions of CheMin were used during AMASE. Here we discuss the SAM-like EGA-QMS analyses of a selected subset of samples acquired during several field seasons, together with AMASE CheMin team results. The results enable insight into organic content, organic-mineral associations, and mineralogy. Organic materials evolved from all samples over a range of temperatures. In general, this can indicate that the organics have a range of thermal maturity and/or are bound in different ways to their matrix. Most often, organics that were outside of mineral grains were the dominant pool of organic material inferable from the EGA-QMS, but organics encapsulated within mineral grains, including possibly methane, were also inferred. Organic-mineral associations can influence organic preservation potential and detection. Constraints on these associations, and overall sample organic chemistry, enabled by our SAM-like EGA-QMS analog analyses demonstrate the potential to understand the organic chemical characteristics in materials sampled by MSL, even when utilizing EGA-QMS, the simplest type of solid sample experiment SAM will perform. Any organic chemical information inferred from EGA-QMS analysis could then also be followed by detailed SAM EGA-GCMS and/or EGA-TLS. AMASE analog studies also indicate that SAM EGA-QMS can be expected to support and, in some cases, supplement, CheMin-derived mineralogical analyses of martian surface materials sampled by MSL. Key potential contributions include additional constraints on minor abundances of volatile-bearing minerals or additional insights into the crystallinity of clays or clay mineraloid phases detected. Overall, the types of secondary minerals in a martian assemblage, as well as the nature (e.g., crystallinity) of those phases, can help constrain alteration conditions. Our detailed comparisons between SAM-like and CheMin-like analyses of Mars analogs should provide information that will be directly relevant to interpretation of MSL flight data. JF - American Geophysical Union Fall Meeting AU - McAdam, A AU - Stern, J C AU - Mahaffy, P R AU - Blake, D F AU - Morris, R V AU - Ming, D W AU - Bristow, T AU - Steele, A AU - Amundsen, H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P12A EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656037490?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=SAM-like+evolved+gas+analysis+of+Mars+analog+samples+from+the+Arctic+Mars+analog+Svalbard+expedition%3B+implications+for+analyses+by+the+Mars+science+laboratory&rft.au=McAdam%2C+A%3BStern%2C+J+C%3BMahaffy%2C+P+R%3BBlake%2C+D+F%3BMorris%2C+R+V%3BMing%2C+D+W%3BBristow%2C+T%3BSteele%2C+A%3BAmundsen%2C+H%3BAnonymous&rft.aulast=McAdam&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Geochemical analysis of layered outcrops using laser-induced breakdown spectroscopy (LIBS); implications for Mars exploration AN - 1656037304; 2015-014387 AB - The chemistry and the stratigraphy of sedimentary, evaporative, and other types of deposits are indicators of their depositional environment and climate, and the evolution of these over time. Over the past eight years, the Mars Exploration Rovers (MER) have investigated several outcrops at Meridiani Planum and Gusev Crater. Compared to the MER, the capabilities of Curiosity to investigate outcrops and other deposits are enhanced because the rover incorporates a stand-off laser-induced breakdown spectroscopy (LIBS) instrument within the ChemCam suite. ChemCam's LIBS instrument has the capability to obtain chemical information from a large variety of targets at various distances, up to 7 m, including targets at a distance within stratigraphic layers non-accessible to other payload elements. In this work we demonstrate that semi-quantitative chemical stratigraphy can be very rapidly obtained by performing LIBS measurements on visually distinct layers within an outcrop at a terrestrial Mars analogue: the Atacama Desert, Chile. Such semi-quantitative chemical stratigraphy provides very valuable information on the distribution of elements within the analyzed layers, which can be used for tactical mission planning purposes. We performed laboratory laser-induced breakdown spectroscopy (LIBS) and laser Raman spectroscopy measurement on field samples from a layered outcrop from the Atacama Desert, Chile. This layered outcrop is a good terrestrial morphological analogue for similar formations that will likely be investigated by the Mars Science Laboratory on Gale crater. Our results demonstrate that LIBS can generate semi-quantitative chemical profiles in less than 1 min using automated data processing tools, and therefore the LIBS instrument can become an invaluable tactical tool on MSL for rapid geochemical survey of layered outcrops. The derived chemical profile at the terrestrial analog is consistent with the range of minerals identified by Raman spectroscopy. In the framework of planetary exploration, LIBS can be used during MSL daily tactical operations for rapid geochemical survey of layered outcrops. Morphologically analogous sub-meter layered outcrops exist in Gale crater, and will be potential scientific targets during the MSL mission due to their high relevance to the mission's objectives. On the other hand, a combined Raman/LIBS investigation may provide a rapid mineralogical/chemical evaluation of the target that can be very useful for selecting samples to be eventually collected for sample return purposes or sample sites to be drilled in the search for astrobiology-related species. JF - American Geophysical Union Fall Meeting AU - Sobron, P AU - Lefebvre, C AU - Leveille, R J AU - Koujelev, A AU - Haltigin, T AU - Hongwei, D AU - Wang, A AU - Cabrol, N A AU - Zacny, K AU - Craft, J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P11E EP - 1879 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656037304?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Geochemical+analysis+of+layered+outcrops+using+laser-induced+breakdown+spectroscopy+%28LIBS%29%3B+implications+for+Mars+exploration&rft.au=Sobron%2C+P%3BLefebvre%2C+C%3BLeveille%2C+R+J%3BKoujelev%2C+A%3BHaltigin%2C+T%3BHongwei%2C+D%3BWang%2C+A%3BCabrol%2C+N+A%3BZacny%2C+K%3BCraft%2C+J%3BAnonymous&rft.aulast=Sobron&rft.aufirst=P&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Search for organic molecules on Mars with the gas chromatograph-mass spectrometer of the sample analysis at Mars experiment onboard the MSL 2011 Curiosity Rover AN - 1656035618; 2015-014339 AB - In past times, life might have emerged under Martian conditions milder than the present ones, and left some remnants at the surface. Even if this did not happen, prebiotic molecules may have been preserved in the soil, and they might be similar to those that prevailed on the Earth surface some 3.5 to 4 billion years ago. NASA's MSL2011 rover Curiosity will explore the surface and subsurface of Mars, seeking traces of prebiotic or biological activity. Organic signatures are among the main signatures of interest in this frame, and they will be among the main targets of the Gas Chromatograph Quadrupole Mass Spectrometer (GC-QMS) which constitutes the core of the Sample Analysis at Mars (SAM) analytical laboratory, developed by the NASA/GSFC in collaboration with the University of Paris (Fr) and the JPL. The main goal of this instrumentation is indeed to determine molecular abundances and isotopic ratios of organic molecules present in the collected samples, by analyzing gases either sampled from the atmosphere, or obtained from soil processing, either by physical heating or chemical reactions. In order to prepare for the interpretation of the data obtained in situ with the GCQMS of SAM, and due to the complexity of this instrumentation, a number of calibrations are required to determine the exact behavior of each part of this instrumentation, that is required to correctly treat the signal and obtain a correct interpretation of it. In order to prepare the SAM-GC in situ results treatment and interpretation, it is necessary: (1) to determine the instrument ability to detect targets molecules under the instrument operating conditions and (2) to create data bases to help for the identification and quantification of the molecules that could be detected with SAM. With this aim we first selected molecules which might be analyzed with SAM-GC using the following criteria: (1) abundance at the Mars surface (2) astrobiological interest, (3) formation during the sample preparation. Then we characterized these target molecules with laboratory instrumentation using discrete spare components of the GC flight model; in a second step, we used a SAM-GC spare model, in a vacuum chamber roughly reproducing the environmental conditions inside the Curiosity rover. A following step will be to carry out similar experiments with the whole SAM testbed located at the NASA/GSFC. This paper will present an overview of the analytical capabilities of the GC-QMS, with a focus on the GC part, relying on the calibration described previously. In addition, we will present analyses done on Atacama soil samples, Mars soil analog, to get an evaluation of the SAM GC performances with a natural sample. JF - American Geophysical Union Fall Meeting AU - Szopa, C AU - Francois, P AU - Coll, P J AU - Cabane, M AU - Coscia, D AU - Teinturier, S AU - Stalport, F AU - Buch, A AU - Mahaffy, P R AU - Glavin, D P AU - Freissinet, C AU - Eigenbrode, J L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P11B EP - 1819 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656035618?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Search+for+organic+molecules+on+Mars+with+the+gas+chromatograph-mass+spectrometer+of+the+sample+analysis+at+Mars+experiment+onboard+the+MSL+2011+Curiosity+Rover&rft.au=Szopa%2C+C%3BFrancois%2C+P%3BColl%2C+P+J%3BCabane%2C+M%3BCoscia%2C+D%3BTeinturier%2C+S%3BStalport%2C+F%3BBuch%2C+A%3BMahaffy%2C+P+R%3BGlavin%2C+D+P%3BFreissinet%2C+C%3BEigenbrode%2C+J+L%3BAnonymous&rft.aulast=Szopa&rft.aufirst=C&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-02-19 N1 - CODEN - #07548 ER - TY - JOUR T1 - Improvements to the crustal dynamics data information system AN - 1648909076; 2015-008755 AB - NASA's space geodesy archive, the Crustal Dynamics Data Information System (CDDIS), provides data archiving and distribution support to a global research community. The archive consists of GNSS, laser ranging, VLBI, and DORIS data sets and products derived from these data. The CDDIS is one of NASA's Earth Observing System Data and Information System (EOSDIS) distributed data centers; EOSDIS data centers serve a diverse user community and are tasked to provide facilities to search and access science data and products. The CDDIS data system and its archive are vital components to many national and international science communities, in particular several of the operational services within the International Association of Geodesy (IAG) and its project the Global Geodetic Observing System (GGOS), including the International DORIS Service (IDS), the International GNSS Service (IGS), the International Laser Ranging Service (ILRS), the International VLBI Service for Geodesy and Astrometry (IVS), and the International Earth Rotation Service (IERS). Several activities are nearing completion at the CDDIS to aid users in data discovery, both within the international space geodesy community and beyond. The CDDIS has completed enhancements to its implementation of the Geodetic Seamless Archive Centers (GSAC). The service provides web services to facilitate data discovery within and across participating archives. The CDDIS is currently implementing modifications to the metadata extracted from incoming data and product files pushed to its archive to permit information about CDDIS archive holdings to be made available through other data portals such as Earth Observing System (EOS) Clearinghouse (ECHO). The CDDIS hopes to soon install an Ntrip broadcast relay to support the activities of the IGS Real-Time Pilot Project (RTPP) and the future Real-Time IGS Service. This poster will include background information about the system and its user communities, archive contents and updates, enhancements for data discovery, new system architecture, and future plans. JF - American Geophysical Union Fall Meeting AU - Noll, C E AU - Dube, M P AU - Michael, B P AU - Pollack, N AU - Tyahla, L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract IN43B EP - 1515 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1648909076?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aabiglobal&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Accounting+%26+Economics&rft.atitle=Corporate+Performance+and+Managerial+Remuneration%3A+An+Empirical+Analysis&rft.au=Murphy%2C+Kevin+J&rft.aulast=Murphy&rft.aufirst=Kevin&rft.date=1985-04-01&rft.volume=7&rft.issue=1-3&rft.spage=11&rft.isbn=&rft.btitle=&rft.title=Journal+of+Accounting+%26+Economics&rft.issn=01654101&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-29 N1 - CODEN - #07548 ER - TY - JOUR T1 - The hydrogen distribution of the Gale crater; Mars Odyssey Neutron Spectrometer AN - 1645575566; 2015-005522 AB - The Mars Science Laboratory carries the most advanced suite of scientific instruments ever sent to the surface of Mars. Its main objective is to study whether Mars has been habitable at any point of its history. Such studies include the analysis of surficial soils and rocks to understand their mineralogical and chemical make up, additionally, the distribution of hydrogen in the top approximately 30 cm of the surface at some locations of the Gale crater. Mars Odyssey carries a Neutron Spectrometer that has been gathering information for more than a decade. Such information maps the global hydrogen in the top few decimeters of the martian surface and is complementary to the one that will be collected by MSL. Recently, Maurice et al. (2011) has re-analyzed the MONS epithermal data and significantly lowered the statistical systematic uncertainties that plagued previous versions of the data. However, MONS counting-rate data have a FWHM of approximately 550 km, which is sufficiently broad to contain several Gale craters in it. In this study, we choose the PIXON numerical deconvolution technique (Pina 2001, Eke 2001). This algorithm removes the point spread function without introducing spurious features in the presence of noise. We have previously carried out a detailed study of the martian polar regions applying such a methodology to Martian epithermal neutrons near both poles (e.g. Teodoro 2010, 2011) and have been able to reach a resolution of approximately 45 km. In the present study, we will apply this technique to the latest MONS epithermal data at an area centered around the Gale crater. JF - American Geophysical Union Fall Meeting AU - Teodoro, L F AU - Feldman, W C AU - Elphic, R C AU - Eke, V AU - Maurice, S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P21C EP - 1860 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645575566?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+hydrogen+distribution+of+the+Gale+crater%3B+Mars+Odyssey+Neutron+Spectrometer&rft.au=Teodoro%2C+L+F%3BFeldman%2C+W+C%3BElphic%2C+R+C%3BEke%2C+V%3BMaurice%2C+S%3BAnonymous&rft.aulast=Teodoro&rft.aufirst=L&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Synergism of Saturn, Enceladus and Titan and formation of HCNO exobiological molecules AN - 1645575287; 2015-005550 AB - Saturn as a system has two very exotic moons Titan and Enceladus. Titan with energy input from Saturn's magnetosphere, solar UV irradiation, and galactic cosmic rays (GCRs) can make HCN based molecules. Space radiation effects at both moons, and as coupled by the Saturn magnetosphere, could lead to the evolution of biological models at Titan composed of HCNO with oxygen as the new ingredient. The "Old Faithful" model by Cooper et al. (2009) suggests that Enceladus, highly irradiated by Saturn magnetospheric electrons, has episodic ejections of water vapor into Saturn's magnetosphere. At Titan Cassini discovered keV oxygen ions, evidently from Enceladus, bombarding Titan's upper atmosphere (Hartle et al., 2006a,b) and abundant heavy positive and negative ions within Titan's upper atmosphere (Coates et al., 2007). Heavy ion formation in Titan's upper atmosphere can be due polymerization of aromatics such as Benzenes to make polycyclic aromatic hydrocarbons (PAH) (Waite et al., 2007) and/or the polymerization of carbon chains from acetylene to make fullerenes (Sittler et al., 2009). Fullerenes, which are hollow carbon shells, can trap the keV oxygen ions. Clustering of fullerenes, PAHs and PAHNs can form larger aerosols enriched in trapped oxygen which can then precipitate down to Titan's surface. GCRs will chemically process aerosol materials at the surface and provide sufficient energy for processing them into more complex organic forms such as amino acids. We have developed an advanced model of GCR interaction with Titan's atmosphere, surface and sub-surface. This allows one to estimate dose rates at the surface and below and then using laboratory results by Hudson et al. (2008) to estimate abundances of the amino acid such glycene to approximately 100 ppb over time periods relatively short compared to solar system timescales. Therefore, the Saturn system can provide pathways for the accumulation of prebiotic chemicals on Titan's surface. JF - American Geophysical Union Fall Meeting AU - Sittler, E C AU - Cooper, J F AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P21F EP - 1904 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1645575287?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Synergism+of+Saturn%2C+Enceladus+and+Titan+and+formation+of+HCNO+exobiological+molecules&rft.au=Sittler%2C+E+C%3BCooper%2C+J+F%3BAnonymous&rft.aulast=Sittler&rft.aufirst=E&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2015-01-01 N1 - PubXState - DC N1 - Last updated - 2015-01-15 N1 - CODEN - #07548 ER - TY - JOUR T1 - Comparison of the electrical response of dry and hydrosaturated gabbro as a function of uniaxial stress AN - 1637543456; 2014-101197 AB - Suggestions that substantial charge generation occurs in the Earth's crust as a result of tectonic loading and variations in this loading prior to earthquakes have been controversial because the presence of fluids in crustal materials is thought to preclude the storing of charge. A series of laboratory experiments was set up to investigate the charge response during repetitive step loading of a suite of dry and saturated rocks. The dry rocks include those with possible semiconductor properties (granite, sandstone, gabbro) and those without (marble, limestone). Saturated samples (gabbro) were prepared by firstly vacuum removing all fluids and gas from open pores, microcracks and fractures and then saturating them for several months with fluids similar to those observed in and around fault zones. Brine with an electrical conductivity matched to that observed in and near fault zones (2 S/m) was obtained by preparing a 0.56 molar NaCl solution. Electrical response from dry rocks during repeated loading cycles from a pedestal stress of 5.6 MPa to 22.7 MPa and back to 5.6 MPa indicates 1) a short-term transient current response of a few tens of pA during loading and unloading with decay time constants of seconds consistent with generation and decay of electrical charge from various alternative physical processes, 2) a net negative current with increasing load in most cases of a few pA or less, and 3) a similar response for rocks with and without semiconductor properties. For the fluid-saturated sample tested, resistance was much lower as expected, and the resistance was increased such that it was on par with the dry sample with a 100 Mohm padding resistor. The baseline was slowly drifting, and continuous currents were observed from self-potential (SP) and electrokinetic effects, but step-loading and unloading produced no observable changes in current generation. This is consistent with self discharge expected in the electrically conductive crust near active faults during tectonic loading. Voltage was also observed to change as a 3 to 4 mV offset from the baseline in the positive direction when stress was applied to the sample. JF - American Geophysical Union Fall Meeting AU - Dahlgren, R AU - Johnston, M J AU - Freund, Friedemann T AU - Nakaba, R N AU - Vanderbilt, Vern C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract NH41B EP - 1609 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637543456?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Comparison+of+the+electrical+response+of+dry+and+hydrosaturated+gabbro+as+a+function+of+uniaxial+stress&rft.au=Dahlgren%2C+R%3BJohnston%2C+M+J%3BFreund%2C+Friedemann+T%3BNakaba%2C+R+N%3BVanderbilt%2C+Vern+C%3BAnonymous&rft.aulast=Dahlgren&rft.aufirst=R&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/NH/sessions/NH41B/abstracts/NH41B-1609.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Extreme precipitation and high-impact landslides AN - 1637542799; 2014-101246 AB - It is well known that extreme or prolonged rainfall is the dominant trigger of landslides; however, there remain large uncertainties in characterizing the distribution of these hazards and meteorological triggers at the global scale. Researchers have evaluated the spatiotemporal distribution of extreme rainfall and landslides at local and regional scale primarily using in situ data, yet few studies have mapped rainfall-triggered landslide distribution globally due to the dearth of landslide data and consistent precipitation information. This research uses a newly developed Global Landslide Catalog (GLC) and a 13-year satellite-based precipitation record from Tropical Rainfall Measuring Mission (TRMM) data. For the first time, these two unique products provide the foundation to quantitatively evaluate the co-occurence of precipitation and rainfall-triggered landslides globally. The GLC, available from 2007 to the present, contains information on reported rainfall-triggered landslide events around the world using online media reports, disaster databases, etc. When evaluating this database, we observed that 2010 had a large number of high-impact landslide events relative to previous years. This study considers how variations in extreme and prolonged satellite-based rainfall are related to the distribution of landslides over the same time periods for three active landslide areas: Central America, the Himalayan Arc, and central eastern China. Several test statistics confirm that TRMM rainfall generally scales with the observed increase in landslide reports and fatal events for 2010 and previous years over each region. These findings suggest that the co-occurrence of satellite precipitation and landslide reports may serve as a valuable indicator for characterizing the spatiotemporal distribution of landslide-prone areas in order to establish a global rainfall-triggered landslide climatology. This research also considers the sources for this extreme rainfall, citing teleconnections from ENSO as a likely source for regional precipitation variability. This work demonstrates the potential for using satellite-based precipitation estimates to identify potentially active landslide areas at the global scale in order to improve landslide cataloging and quantify landslide triggering at daily, monthly and yearly time scales. JF - American Geophysical Union Fall Meeting AU - Kirschbaum, Dalia B AU - Adler, R F AU - Peters-Lidard, Christa D AU - Huffman, George J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract NH43C EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637542799?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Extreme+precipitation+and+high-impact+landslides&rft.au=Kirschbaum%2C+Dalia+B%3BAdler%2C+R+F%3BPeters-Lidard%2C+Christa+D%3BHuffman%2C+George+J%3BAnonymous&rft.aulast=Kirschbaum&rft.aufirst=Dalia&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/NH/sessions/NH43C/abstracts/NH43C-02.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Detection and analyses of traveling ionospheric disturbances from two successive earthquakes and tsunami waves AN - 1637542672; 2014-101185 AB - Traveling ionospheric disturbances (TIDs), induced by acoustic-gravity waves (AGWs) in the neutral atmosphere, are observable in trans-ionospheric Global Navigation Satellite System (GNSS) measurements. Previous studies on the GNSS-derived ionospheric disturbances have been presented for studying the interactions between ionospheric perturbations associated with the 2011 Japan Tohoku Earthquakes and Tsunamis. Three different types of TIDs were observed. Short-period disturbances (2-8 minutes) with speeds up to 2300 km/s were observed in the near-field, and the long-period (8-22 minutes) disturbances with speeds (195-354 m/s) were identified in both near- and far-fields. In this study, identification and classification of ionospheric disturbances was conducted using a wavelet detection method in combination with a cross-correlation technique estimating the propagation speeds and directions of atmosphere wave-induced disturbances in dual frequency IEC time series collected form GNSS networks near the epicenter of the March 11, 2011 Japan Tohoku earthquake and the subsequent tsunami induced by it. Through the use of the wavelet detection process, we are able to find major wave trains, present in the data collected from these networks, with two dominate frequency bands corresponding to the disturbances from two successive earthquakes and tsunami propagations. Additionally, the comparative observations and model predictions, including ground motions and tsunami propagations calculated by JPL using the MOST model are used to understand and perceive the dominant properties (propagation speeds, directions, periods and occurrence times) of the GPS-derived ionospheric disturbances. This analysis is demonstrated on data from 1235 stations in the Japanese GEONET GPS network. A comparison between GNSS-derived disturbances, ground motions and tsunami propagations shows that the propagation directions and speeds of short-period disturbances are consistent with the acoustic waves triggered by the main-shock and aftershock with different epicenters. The propagation directions and speeds of the long-period disturbances are in agreement with the tsunami propagations. JF - American Geophysical Union Fall Meeting AU - Yang, Oscar Y AU - Garrison, J L AU - Komjathy, Attila AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract NH41A EP - 1595 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637542672?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Detection+and+analyses+of+traveling+ionospheric+disturbances+from+two+successive+earthquakes+and+tsunami+waves&rft.au=Yang%2C+Oscar+Y%3BGarrison%2C+J+L%3BKomjathy%2C+Attila%3BAnonymous&rft.aulast=Yang&rft.aufirst=Oscar&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/NH/sessions/NH41A/abstracts/NH41A-1595.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - A new model for long-period tidal variations in length of day AN - 1637533257; 2014-103820 AB - The standard IERS model for tidal variations in length of day (LOD), covering the band from one week to 18.6 years, stems from a 30-year-old paper by Yoder, Williams, and Parke. Their original table has been updated in the latest adopted standards by modifying only a few constituents: four constituents were adjusted for effects of mantle anelasticity and two constituents for effects of ocean tides. We here present a new, consistent, and comprehensive model. While Yoder et al. employed 62 tidal spectral lines, we employ 80, most of the new lines being higher frequency lines that are now detectable, or nearly detectable, in LOD measurements. We employ an anelastic model of Wahr and Bergen consistently to all lines throughout the entire long-period band, although there remains uncertainty in extrapolating to the lowest frequencies. Our model of ocean tides builds on recent experience modeling the fortnightly Mf tide (Ray and Egbert, Geophys. J. Int., 2012), for which good observational data allow extensive testing of both the numerical ocean model and the Wahr-Bergen anelastic model. Ocean model improvements now appear adequate to remove our dependence on data assimilation for Mf (at least for Earth-rotation effects), which is a critical requirement before extending to other frequencies that lack reliable observational constraints. We have run the model for 12 major long-period constituents. The ocean-tide admittance at these 12 frequencies is then interpolated smoothly to all other lines, while relaxing to self-consistent equilibrium for the node tide. Application of this new model to a modern time series of space-geodetic LOD measurements shows a significant reduction in variance compared with the current IERS model. For example, in the 10-70 cpy band, the variance is reduced by 8%. JF - American Geophysical Union Fall Meeting AU - Ray, R D AU - Erofeeva, S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G53C EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637533257?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=A+new+model+for+long-period+tidal+variations+in+length+of+day&rft.au=Ray%2C+R+D%3BErofeeva%2C+S%3BAnonymous&rft.aulast=Ray&rft.aufirst=R&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - In-depth analysis and evaluation of GSFC GRAIL gravity field models AN - 1637530924; 2014-100911 AB - The Gravity Recovery and Interior Laboratory (GRAIL) spacecraft were launched on September 10, 2011, and conducted their primary mapping mission from March 1 until May 29, 2012. Primary mission data have been processed at NASA/GSFC using the GEODYN software, resulting in high-resolution (degree and order 420 in spherical harmonics) gravity field models of high accuracy. Here, we present an in-depth analysis of the GRAIL gravity field determination at GSFC. We especially focus on the Ka-band range-rate (KBRR) data, and on the use of GRAIL gravity models on tracking data of other spacecraft. We also investigate to what extent the addition of other tracking data (especially Lunar Prospector data) can help to further enhance the lunar gravity field models. Since the orbit of the GRAIL spacecraft was not constant during the primary mission and sensibly elliptical at the beginning and end of the science phase (20 by 80 kilometers, in altitude above lunar surface), there are areas on the Moon where the spacecraft altitude was relatively low compared to the global average. This results in remaining signal in especially the KBRR data that is not necessarily captured by the global models expressed in spherical harmonics. We explore the performance of the GRAIL gravity field models over certain regions with low-altitude KBRR data, and we also investigate analysis methods to estimate local adjustments to the gravity field models. JF - American Geophysical Union Fall Meeting AU - Goossens, Sander J AU - Lemoine, Frank G AU - Mazarico, E AU - Rowlands, David D AU - Sabaka, Terence J AU - Nicholas, Joseph B AU - Neumann, Gregory A AU - Zuber, M T AU - Smith, David E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G32A EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637530924?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=In-depth+analysis+and+evaluation+of+GSFC+GRAIL+gravity+field+models&rft.au=Goossens%2C+Sander+J%3BLemoine%2C+Frank+G%3BMazarico%2C+E%3BRowlands%2C+David+D%3BSabaka%2C+Terence+J%3BNicholas%2C+Joseph+B%3BNeumann%2C+Gregory+A%3BZuber%2C+M+T%3BSmith%2C+David+E%3BAnonymous&rft.aulast=Goossens&rft.aufirst=Sander&rft.date=2012-12-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Asia's changing water resources; trends from GRACE and implications for water management AN - 1637530908; 2014-100921 AB - Over half of the world's population is located in the Asian continent. Water resources in the region are vital not only for basic human water consumption, but also to support agriculture, energy development, and industrial growth. In this work, we use 10 years of observations from the Gravity Recovery and Climate Experiment (GRACE) satellite mission to evaluate freshwater storage trends in the Asian continent. We calculate the specific trends in crucial river basins by averaging GRACE data into defined river basin boundaries. In addition, we calculate trends in the major groundwater aquifers in the region by combining GRACE data with land-surface model output to isolate the groundwater component of the GRACE signal. Several "hotspots" of water storage decline or increase are also emerging in the Asian continent. Our results illustrate a complex picture of water resources in Asia, and point to the need for a more detailed understanding of the hydrologic dynamics of the region. In particular, improved knowledge of the changes in the Himalayas, which act as the headwaters for the majority of the surface water in the continent and where the changes in glaciers may have profound impacts on downstream water availability, is needed. Finally, this study acts as a snapshot of the trends in Asia's water resources and the broad trends in the region can be used to inform water management and policy decisions to ensure human, food, and energy security in the region. JF - American Geophysical Union Fall Meeting AU - Voss, K AU - Famiglietti, J S AU - Reager, J T AU - Lo, M AU - Ho, S AU - de Linage, Caroline AU - Rodell, M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G33A EP - 0939 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637530908?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Asia%27s+changing+water+resources%3B+trends+from+GRACE+and+implications+for+water+management&rft.au=Voss%2C+K%3BFamiglietti%2C+J+S%3BReager%2C+J+T%3BLo%2C+M%3BHo%2C+S%3Bde+Linage%2C+Caroline%3BRodell%2C+M%3BAnonymous&rft.aulast=Voss&rft.aufirst=K&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - The soil-plant-atmosphere system; past and present AN - 1637530847; 2014-100955 AB - Plants with stomata, roots and a vascular system first appeared on earth about 415 million years ago. This evolutionary innovation helped to set in motion non-linear feedback mechanisms that led to an acceleration of the hydrologic cycle over the continents and an expansion of the climate zones favorable for plant (and animal) life. Skeletal soils that developed long before plants came onto the land would have held water and nutrients in their pore space, yet these resources would have been largely unavailable to primitive, surface-dwelling non-vascular plants due to physical limitations on water transport once the surface layer of soil dries. Plants with roots and a vascular system that could span this dry surface layer could gain increased and prolonged access to the water and nutrients stored in the soil for photosynthesis. Maintenance of the hydraulic connections permitting water to be drawn through the vascular system from deep in the soil to the sites of evaporation in the leaves required a cuticle and physiological regulation of stomata. These anatomical and physiological innovations changed properties of the terrestrial surface (albedo, roughness, a vascular system and control of surface conductance) and set in motion complex interactions of the soil - plant - atmosphere system. We will use coupled physiological and meteorological models to examine some of these interactions. JF - American Geophysical Union Fall Meeting AU - Berry, J A AU - Baker, I T AU - Randall, D A AU - Sellers, P J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H32E EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637530847?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+soil-plant-atmosphere+system%3B+past+and+present&rft.au=Berry%2C+J+A%3BBaker%2C+I+T%3BRandall%2C+D+A%3BSellers%2C+P+J%3BAnonymous&rft.aulast=Berry&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - High degree and order gravity fields of the Moon derived from GRAIL data AN - 1637527494; 2014-100910 AB - The Gravity Recovery and Interior Laboratory (GRAIL) spacecraft conducted the mapping of the gravity field of the Moon from March 1, 2012 to May 29, 2012. The twin spacecraft acquired highly precise K Band range-rate (KBRR) intersatellite ranging data and Deep Space Network (DSN) data during this prime mission phase from altitudes of 15 to 75 km above the lunar surface over three lunar months. We have processed these data using the NASA GSFC GEODYN orbit determination and geodetic parameter estimation program, and we have determined gravity fields up to degree and order 420 in spherical harmonics. The new gravity solutions show improved correlations with LOLA-derived topography to high degree and order and resolve many lunar features in the geopotential with a resolution of less than 30 km, including for example the central peak of the crater Tycho. We discuss the methodology used for the processing of the GRAIL data, the quality of the orbit determination on the GRAIL satellites and the derivation of the solutions, and their evaluation with independent data, including Lunar Prospector. We show that with these new GRAIL gravity solutions, we can now fit the low altitude, extended mission Lunar Prospector tracking data better than with any previous gravity model that included the LP data. JF - American Geophysical Union Fall Meeting AU - Lemoine, Frank G AU - Goossens, Sander J AU - Sabaka, Terence J AU - Nicholas, Joseph B AU - Mazarico, E AU - Loomis, B D AU - Chinn, Douglas S AU - Caprette, D AU - McCarthy, J J AU - Neumann, Gregory A AU - Zuber, M T AU - Smith, D E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G32A EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637527494?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=N%2850%29+Crater+Retention+Ages+for+an+Expanded+Inventory+of+Lunar+Basins%3A+Evidence+for+an+Early+Heavy+Bombardment+and+a+Late+Heavy+Bombardment%3F&rft.au=Frey%2C+Herbert%3BBurgess%2C+Emily&rft.aulast=Frey&rft.aufirst=Herbert&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Characteristics of recent megathrust earthquakes in the decade-long global gravity observations from GRACE AN - 1637527251; 2014-100926 AB - We report GRACE satellite observations of "ongoing" gravitational potential changes after recent megathrust earthquakes of the 2004 Mw 9.2 Sumatra-Andaman Islands, 2010 Mw 8.8 Maule (Chile), and 2011 Mw 9.0 Tohoku-Oki (Japan) ruptures. The 10-year time-series (since April 2002) of global gravitational potential data are characterized consistently with not only coseismic (episodic) offsets but also postseismic (gradual) relaxation, when localized at the respective area of each earthquake. The recently available Release-05 (RL05) global gravity data (Level-2 data) show ongoing postseismic changes prevailing over other signals and noise, nearly 8 years after the 2004 rupture, and 1 and 2 years after the 2011 and 2010 ruptures, respectively. The abrupt changes in the time-series are consistent with the predicted gravity changes from various seismic solutions, when the centroids locate within the crustal layers (24 km deep or less) with a specific range of compressibility, ruling out the deeper centroid sources. The transient or steady-state changes after all three earthquakes, evident in a decade-long time-series, may imply viscoelastic mantle flow triggered by megathrust ruptures and, ultimately, constrain the asthenosphere rheology and viscosity. For all three megathrust ruptures, the GRACE gravity observations consistently show large-scale interior deformation associated with density change (dilatation). The GRACE observations represent averages over a time window much longer than accessible from seismic data and over a spatial scale much broader than covered by conventional 'geodetic' data. Therefore, GRACE will convey the behavior of the earthquakes on temporal and spatial scales transgressing the seismic and geodetic spectrum. The future GRACE follow-on mission equipped with enhanced instrumentation should allow us to exploit gravitational potential data in the analysis of smaller, and thus more frequent seismic events. JF - American Geophysical Union Fall Meeting AU - Han, S AU - Riva, R E AU - Sauber, J M AU - Okal, E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G33A EP - 0947 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637527251?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Characteristics+of+recent+megathrust+earthquakes+in+the+decade-long+global+gravity+observations+from+GRACE&rft.au=Han%2C+S%3BRiva%2C+R+E%3BSauber%2C+J+M%3BOkal%2C+E%3BAnonymous&rft.aulast=Han&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Basin ring faults and giant dikes on the Moon revealed by GRAIL gravity gradiometry AN - 1637527099; 2014-100915 AB - Gravity gradiometry makes use of the second spatial derivatives of the potential field (the first derivatives of the acceleration), which can be directly measured by surface, aerial, or satellite-based gradiometers or can be derived from the potential field itself. Gravity gradiometry is particularly well suited for identifying discrete structures in the subsurface such as faults cutting across density interfaces and dikes of different density from the host rock. With new high-resolution gravity data from the Gravity Recovery and Interior Laboratory (GRAIL) mission, gravity gradiometry techniques can now be applied to the Moon. We here use the second horizontal derivatives of the lunar potential field derived from GRAIL to investigate the structure of lunar multiring basins. The potential is first separated into surface (terrain, derived from the topography) and subsurface (Bouguer) components. The horizontal gradient tensor is then used to calculate the eigenvalues and eigenvectors, from which the local radial and azimuthal gradients around the basins are calculated. The gradients of the terrain component of the potential field are dominated by the surface expression of the rings, whereas the gradients of the Bouguer component of the potential reveal the presence of ring faults in the subsurface. These subsurface anomalies may arise at the intersection of the faults with either the Moho or an intracrustal density interface separating the upper and lower crust. In many instances, the subsurface expressions of the ring structures in the Bouguer gradients are more prominent than the surface expressions in the terrain gradients. For the Orientale basin, the subsurface expression of ring faults is detected in association with both the Outer Rook and Cordillera rings, supporting a tectonic origin for both rings. The subsurface manifestations of the rings are displaced inward toward the basin center relative to their surface expressions, consistent with the expectation for inward-dipping normal faults. Some contribution to the Bouguer anomalies from dikes intruded along the ring faults is also possible. The spacing between the surface and subsurface expressions of the rings varies widely from one basin to another. These differences can be attributed to either variations in the dip of the ring faults or lateral variations in the vertical density structure of the lunar crust. In addition to the basin rings, a number of large linear anomalies that are not associated with basins are observed in the gravity gradient maps. Four such anomalies are observed with lengths of 500-1000 km, following great circle paths. The Bouguer anomalies and Bouguer gradients associated with the large linear anomalies are consistent with predictions for the gravitational expression of giant dikes or elongated magma chambers. Preliminary analysis has found no surface expression of the large linear anomalies in topographic or image data. We interpret these anomalies as the manifestations of giant dikes, dike swarms, or elongated magma chambers formed early in lunar history. These results demonstrate the utility of gravity gradiometry in planetary applications and reveal new details of the subsurface structure of the Moon. JF - American Geophysical Union Fall Meeting AU - Andrews-Hanna, J C AU - Zuber, Maria T AU - Smith, David E AU - Melosh, H J AU - Neumann, Gregory A AU - Phillips, Roger J AU - Solomon, Sean C AU - Wieczorek, M A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G32A EP - 08 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637527099?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Basin+ring+faults+and+giant+dikes+on+the+Moon+revealed+by+GRAIL+gravity+gradiometry&rft.au=Andrews-Hanna%2C+J+C%3BZuber%2C+Maria+T%3BSmith%2C+David+E%3BMelosh%2C+H+J%3BNeumann%2C+Gregory+A%3BPhillips%2C+Roger+J%3BSolomon%2C+Sean+C%3BWieczorek%2C+M+A%3BAnonymous&rft.aulast=Andrews-Hanna&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Bouguer gravity anomalies associated with lunar craters; initial results from the GRAIL mission AN - 1637526983; 2014-100914 AB - During its primary mapping phase, the Gravity Recovery and Interior Laboratory (GRAIL) mission has mapped the gravity field of the Moon to unprecedented resolution, providing a spherical harmonic model of degree and order 420 and quantitatively useful results to a spatial resolution of at least 20 km. Anomalies associated with impact craters, from large mascon basins down to crater diameters less than 30 km, are the dominant features of a GRAIL degree (l) 420 free-air gravity map of the Moon. Here we focus on the Bouguer gravity anomalies associated with intermediate-sized craters, in the diameter range of approximately 30-230 km. Results from Apollo-era gravity and topography data analyses suggested that the behavior of crater Bouguer anomalies is age-dependent, but the crater database used then was extremely sparse (12 craters). With the GRAIL gravity field we have a vastly larger set of craters to work with and to date have examined approximately 200 craters. We calculate a finite-amplitude Bouguer correction with a semi-analytical spatial Green's function sampling a spherical harmonic representation of the lunar shape matched to the gravity bandwidth used (l = 2-300). The resulting crater Bouguer anomalies, averaged over the inner part of each crater, fall in a range of approximately -40 to +40 mGal. We compare Bouguer anomalies against lunar age, crater diameter, regional elevation, geographical locale, and geological setting. Results are interpreted in terms of processes that have operated in the lunar crust and upper mantle. JF - American Geophysical Union Fall Meeting AU - Phillips, Roger J AU - Zuber, M T AU - Smith, David E AU - Konopliv, A S AU - Park, Ryan S AU - Wieczorek, M A AU - Lemoine, Frank G AU - Neumann, Gregory A AU - Melosh, H J AU - Thomason, C J AU - Egan, Anthony F AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G32A EP - 07 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637526983?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=Surface+Textures+and+Features+Indicative+of+Endogenous+Growth+at+the+Mccartys+Flow+Field%2C+Nm%2C+as+an+Analog+to+Martian+Volcanic+Plains&rft.au=Bleacher%2C+Jacob%3BCrumpler%2C+Larry%3BZimbelman%2C+James%3BGarry%2C+W%3BSelf%2C+Stephen%3BAubele%2C+Jayne&rft.aulast=Bleacher&rft.aufirst=Jacob&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - GRAIL gravity observations of peak-ring basins on the Moon; implications for basin formation AN - 1637526815; 2014-100935 AB - Reassessment of the formation of peak-ring basins on the Moon using image and altimetry data from the Lunar Reconnaissance Orbiter has yielded a number of morphometric properties of these basin types that are helping to constrain the processes leading to their formation and the formation of larger multi-ring basins [1,2]. These analyses demonstrate the importance of the volume and depth of impact melting in modifying the interior morphology of large impact craters. At the onset diameter of peak-ring basins, the depth of the basin's melted zone approaches the depth of the transient crater, creating a strengthless interior melt cavity that facilitates gravitational collapse of the transient crater. The melt cavity suppresses central peak formation, and peak rings are formed outward from the melt zone boundary by the interaction of deep-seated rotational faults in the collapsing wall of the transient crater and huge vertical uplifts in the central portions of the basin. The final configuration of the peak-ring basin has a kilometers-thick slab of cooled residual impact melt resting on an uplifted mantle plug with little or no unmelted crustal material. Highly faulted and fractured, dilatant and possibly thickened crust should occur below and outward from the peak ring due to inward and upward translation of collapsed transient crater rim material. As a result of this configuration, the gravity structure should reflect an anomalously high density, uplifted impact melt plus mantle zone spatially confined to within the peak ring. Surrounding this should be a highly fractured, low density zone of possibly thickened crust. Bouguer gravity anomalies derived from Gravity Recovery and Interior Laboratoy (GRAIL) gravity data and Lunar Orbiter Laser Altimeter (LOLA) altimetry data show spatial patterns that are consistent with those predicted by the formation model briefly outlined above. Nearly all 17 peak-ring basins that have been cataloged on the Moon show positive Bouguer gravity anomalies that are spatially confined within the peak ring. The magnitudes of the anomalies are variable, but appear to be less prominent in the smallest peak-ring basins. These observations are consistent with enhanced crustal densities resulting from thinned crust and extreme uplift of the interior melt zone and mantle below. In many of the basins, the annulus between the peak ring and rim crest shows a Bouguer gravity anomaly that is reduced relative to crust exterior to the rim crest. This is consistent with low density, highly faulted and fractured, dilatant crust resulting from the collapse of the transient cavity and formation of the peak ring. The peak rings show gravity anomalies intermediate between the positive central anomaly and reduced gravity annulus, suggesting that peak rings form at the boundary of the uplifted melt plus mantle plug and the zone of highly fractured or thickened crust. Further quantification of the gravity anomalies and comparisons with the predicted density and crustal structure below peak-ring basins will help to better constrain the preliminary observations presented here. References: [1] Baker et al. (2011) Icarus, 214, 377-393. [2] Baker, D.M.H. et al. (2012) J. Geophys. Res., 117, E00H16. JF - American Geophysical Union Fall Meeting AU - Baker, David M AU - Head, James W AU - Neumann, Gregory A AU - Smith, David E AU - Zuber, M T AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G33B EP - 0959 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1637526815?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=GRAIL+gravity+observations+of+peak-ring+basins+on+the+Moon%3B+implications+for+basin+formation&rft.au=Baker%2C+David+M%3BHead%2C+James+W%3BNeumann%2C+Gregory+A%3BSmith%2C+David+E%3BZuber%2C+M+T%3BAnonymous&rft.aulast=Baker&rft.aufirst=David&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-18 N1 - CODEN - #07548 ER - TY - JOUR T1 - Mineral controls on microbial niche space in subsurface serpentinites of the Coast Range Ophiolite, Northern California AN - 1629946647; 2014-092676 AB - Serpentinites on Earth are excellent candidate environments for the origin of life and continue to serve as an outstanding model system for study of modern selection pressures (such as gradients in temperature, pressure, aqueous geochemistry, oxidation-reduction potential) on microbial communities. Recent coring (August 2011) in the Coast Range Ophiolite near Lower Lake, CA resulted in the establishment of two sets of reference continental serpentinite cores (to 30 and 42 m depth, respectively) and the installation of eight monitoring wells drawing from different depths. Six of these wells plumb serpentinizing waters, with characteristic high pH (up to 12.5), high calcium loads (10-200 ppm), and methane concentrations that are at or near one-atmosphere saturation, while hydrogen levels are orders of magnitude lower than is typically observed in other similar systems. Low hydrogen levels are cryptic; they may reflect consumption by microbial communities or possibly a pressure- or temperature-related solubility response. Two reference wells provide access to quasi-parallel, shallower groundwater flow regimes with near neutral pH values and surface-related major element and organic acid inventories. Many environmental parameters pertinent to microbiological communities active in serpentinites (such as dissolved hydrogen, methane, and other gas concentrations, redox status, ambient pH, and ionic strength) are largely controlled by host rock mineralogy and, thus, the temperature and progress of serpentinization. Since iron partitioning between co-existing minerals in serpentinites is strongly linked to the evolution of hydrogen (McCollom and Bach, 2009), we report here on mineralogy, bulk geochemistry, and selected mineral chemistry data for the serpentinite cores in order to constrain the production of hydrogen, the dominant bioenergetic driving force in this land-based deep biosphere setting. Parallel microbiological analyses of the same drill cores have shown the predominance of putative hydrogen-oxidizing bacteria. Together these data seek to link the mineralogy of microbial habitats in the serpentinite subsurface to the communities they support, which may have important implication for the study of both active and ancient serpentinizing ecosystems. JF - American Geophysical Union Fall Meeting AU - Cardace, D AU - Carnevale, D AU - Schrenk, M O AU - Twing, K I AU - McCollom, T M AU - Hoehler, T M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B43G EP - 0511 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629946647?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Mineral+controls+on+microbial+niche+space+in+subsurface+serpentinites+of+the+Coast+Range+Ophiolite%2C+Northern+California&rft.au=Cardace%2C+D%3BCarnevale%2C+D%3BSchrenk%2C+M+O%3BTwing%2C+K+I%3BMcCollom%2C+T+M%3BHoehler%2C+T+M%3BAnonymous&rft.aulast=Cardace&rft.aufirst=D&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Numerical quantification of habitability in serpentinizing systems AN - 1629946553; 2014-092673 AB - The likely presence of liquid water in contact with olivine-bearing rocks on Mars, the detection of serpentine minerals and of methane emissions possibly consistent with serpentinization, and the observation of serpentine-associated methane-cycling communities on Earth have all led to excitement over the potential of such systems to host life on Mars, even into the present day. However, the habitability of subsurface serpentinizing systems on Mars does not necessarily follow from these qualitative observations. In particular, while the production of H2 during serpentinization could provide methanogens with a needed substrate, the alkaline conditions and corresponding potential for carbon limitation that arise in concert are negatives against which H2 supply must be balanced. We considered this balance via a coupled geochemical-bioenergetic model that weighs the outputs of serpentinization against the metabolic requirements of methanogenesis, in an energetic frame of reference. Serpentinization is modeled using the "Geochemist's Workbench" (GWB) whereby ultramafic harzburgite rocks are reacted with oxygen and sulfate depleted seawater. Reaction kinetics are not explicitly considered, but comparable effects of partial reaction are approximated by assuming post-reaction dilution of equilibrated fluids. The output of GWB serves as the input to the bioenergetic model, which calculates methanogenic energy yields based on spherically-symmetrical diffusion of substrates to a cell followed by reaction at the diffusion-limited rate. Membrane selectivity for substrate transport is explicitly considered. Results will be report updates for two scenarios: (i) High temperature serpentinization followed by cooling and transport of equilibrated fluid to a lower temperature regime accessible to biology; (ii) Serpentinization within the biologically-tolerated range of temperatures. Such coupled models demonstrate that environmental variability with respect to both water-rock reaction, temperature, and biologically-mediated methanogenesis drive orders of magnitude variability in the energy available in methanogenic metabolism. JF - American Geophysical Union Fall Meeting AU - Som, S AU - Alperin, M J AU - Hoehler, T M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B43G EP - 0508 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629946553?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Opposite+Behaviors%3F+Arctic+Sea+Ice+Shrinks%2C+Antarctic+Grows&rft.au=Maria-Jose+Vinas+for+NASA%27s+Earth+Science+News&rft.aulast=Maria-Jose+Vinas+for+NASA%27s+Earth+Science+News&rft.aufirst=&rft.date=2012-11-05&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - SAR-based estimation of glacial extent and velocity fields on Isanotski Volcano, Aleutian Islands, Alaska AN - 1629945320; 2014-095589 AB - Global studies show that Earth's glaciers are losing mass at increasing rates, creating a challenge for communities that rely on them as natural resources. Field observation of glacial environments is limited by cost and inaccessibility. Optical remote sensing is often precluded by cloud cover and seasonal darkness. Synthetic aperture radar (SAR) overcomes these obstacles by using microwave-frequency electromagnetic radiation to provide high resolution information on large spatial scales and in remote, atmospherically obscured environments. SAR is capable of penetrating clouds, operating in darkness, and discriminating between targets with ambiguous spectral signatures. This study evaluated the efficacy of two SAR Earth observation methods on small (< 7 km2) glaciers in rugged topography. The glaciers chosen for this study lie on Isanotski Volcano in Unimak Island, Aleutian Archipelago, USA. The local community on the island, the City of False Pass, relies on glacial melt for drinking water and hydropower. Two methods were used: (1) velocity field estimation based on Repeat Image Feature Tracking (RIFT) and (2) glacial boundary delineation based on interferometric coherence mapping. NASA Uninhabited Aerial Vehicle SAR (UAVSAR) single-polarized power images and JAXA Advanced Land Observing Satellite Phased Array type L-band SAR (ALOS PALSAR) single-look complex images were analyzed over the period 2008-2011. UAVSAR image pairs were coregistered to sub-pixel accuracy and processed with the Coregistration of Optically Sensed Images and Correlation (COSI-Corr) feature tracking module to derive glacial velocity field estimates. Maximum glacier velocities ranged from 28.9 meters/year to 58.3 meters/year. Glacial boundaries were determined from interferometric coherence of ALOS PALSAR data and subsequently refined with masking operations based on terrain slope and segment size. Accuracy was assessed against hand-digitized outlines from high resolution UAVSAR power images, yielding 83.0% producer's accuracy (errors of omission) and 86.1% user's accuracy (errors of commission). These results represent a refinement of a decades-old entry from the USGS National Hydrography Dataset (NHD). The information gained from this study could strengthen management practices by helping decision makers understand the ecological and economic consequences of glacial change. This procedure could be repeated in similar locations worldwide to provide communities with accurate, quantitative information about their changing glacial resources. JF - American Geophysical Union Fall Meeting AU - Sousa, D AU - Lee, A AU - Parker, O P AU - Pressler, Yamina AU - Guo, S AU - Osmanoglu, B AU - Schmidt, Cynthia L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract ED11A EP - 0718 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629945320?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=SAR-based+estimation+of+glacial+extent+and+velocity+fields+on+Isanotski+Volcano%2C+Aleutian+Islands%2C+Alaska&rft.au=Sousa%2C+D%3BLee%2C+A%3BParker%2C+O+P%3BPressler%2C+Yamina%3BGuo%2C+S%3BOsmanoglu%2C+B%3BSchmidt%2C+Cynthia+L%3BAnonymous&rft.aulast=Sousa&rft.aufirst=D&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Future response of the Greenland and Antarctic ice sheets; the SeaRISE experiments AN - 1629945288; 2014-095495 AB - Atmospheric, oceanic, and subglacial forcing scenarios from the Sea-level Response to Ice Sheet Evolution (SeaRISE) project are applied to ten three-dimensional thermomechanical ice-sheet models to assess Greenland and Antarctic ice sheets sensitivity over a 500 year timescale and to inform future modeling and field studies. Here, an analysis of the spatial response of the Greenland and Antarctic ice sheets is presented and summarized. Although the modeled responses are not always homogeneous, consistent spatial trends emerge from the ensemble analysis, indicating distinct vulnerabilities of the Greenland and Antarctic ice sheets. There are clear response patterns associated with each forcing, and a similar ice mass loss (or sea-level rise) at the global scale will result in different mass losses at the regional scale. We show that distinct thickness changes occur with each type of external forcing: increased basal lubrication and warmer ocean conditions affect mainly outlet glaciers, while the impacts of atmospheric forcings affect the entire ice sheet. JF - American Geophysical Union Fall Meeting AU - Nowicki, S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C43F EP - 09 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629945288?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Future+response+of+the+Greenland+and+Antarctic+ice+sheets%3B+the+SeaRISE+experiments&rft.au=Nowicki%2C+S%3BAnonymous&rft.aulast=Nowicki&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - The perennial firn aquifer as a storage mechanism on the Greenland ice sheet AN - 1629945262; 2014-095422 AB - Liquid water retained throughout the winter in the southeast Greenland ice sheet firn layer was discovered while drilling two cores below 1600 m elevation in April 2011. Ground penetrating radar traces the top of this water table to lie between 8 and 25 m. A radar segment driven over the core sites matches the in situ water depth measurements. Airborne radar data from NASA's Operation IceBridge (OIB) acquired 11 days prior to the ground observations and output of a high-resolution coupled regional atmosphere-firn model are used to outline the horizontal extent, depth and temporal evolution of the water layer. This perennial firn aquifer (PFA) is concentrated in the southern ice sheet areas where snow accumulation rate and melt intensity are high. The estimated mass of retained liquid water for April 2011 is 17 +/- 1 Gt. The PFA represents a new storage mechanism for the ice sheet, and needs to be considered in ice sheet hydrology, mass, and energy budget calculations. JF - American Geophysical Union Fall Meeting AU - Forster, R R AU - Box, J E AU - van den Broeke, M R AU - Miege, C AU - Burgess, E W AU - van Angelen, J AU - Lenaerts, J AU - Koenig, L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C42B EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629945262?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+perennial+firn+aquifer+as+a+storage+mechanism+on+the+Greenland+ice+sheet&rft.au=Forster%2C+R+R%3BBox%2C+J+E%3Bvan+den+Broeke%2C+M+R%3BMiege%2C+C%3BBurgess%2C+E+W%3Bvan+Angelen%2C+J%3BLenaerts%2C+J%3BKoenig%2C+L%3BAnonymous&rft.aulast=Forster&rft.aufirst=R&rft.date=2012-12-01&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Basin-scale ice mass balance estimates from GRACE, radar altimetry, InSAR, GPS, and RCM data AN - 1629942907; 2014-098034 AB - Several studies have investigated mass trends for Antarctica using radar altimetry, mass budget calculations and GRACE. Each of these approaches has various limitations, particularly when applied to less well constrained sectors of the ice sheet. In general, however, the error properties are weakly correlated between methods. Here, we present a mass balance trend estimate for two Antarctic drainage basins, covering part of the Peninsula and Siple Coast, employing a rigorous combination of the three methods. The basins were selected to fully exercise the approach and are for regions where errors due to GIA or sampling are high. The mass balance estimate is derived from a combination of satellite, in-situ and climate model data sets. GRACE mass observations, ICESat altimetry data, GPS bedrock elevation trends, InSAR ice flow velocities as well as precipitation data from the ERA Interim forced regional climate model RACMO for the 2003-2010 period are combined using a data assimilation approach to minimise the error covariances. The dynamic versus accumulation driven contributions to the mass trends over the 7 year period as well as rigorous, consistent uncertainties in the mass trends are resolved. Spatial and temporal error characteristics and sampling limitations are taken into account. Additionally, we provide a solution for GIA that is consistent with all the observations but which requires no assumptions about mantle viscosity or ice sheet history. JF - American Geophysical Union Fall Meeting AU - Schoen, N AU - Mangion, A AU - Bamber, J L AU - Luthcke, S B AU - van den Broeke, M R AU - King, M AU - Davis, C H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C53B EP - 0843 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629942907?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Basin-scale+ice+mass+balance+estimates+from+GRACE%2C+radar+altimetry%2C+InSAR%2C+GPS%2C+and+RCM+data&rft.au=Schoen%2C+N%3BMangion%2C+A%3BBamber%2C+J+L%3BLuthcke%2C+S+B%3Bvan+den+Broeke%2C+M+R%3BKing%2C+M%3BDavis%2C+C+H%3BAnonymous&rft.aulast=Schoen&rft.aufirst=N&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Integration of ground-based and airborne LiDAR data for improved terrain model generation AN - 1629942557; 2014-093020 AB - Airborne Laser Scanning (ALS) and Terrestrial Laser Scanning (TLS) have recently seen increased use in studies of earth surface processes. Theory and real-world results indicate that ALS surveys produce reduced accuracy in areas of steep terrain due to beam spread and horizontal geolocation errors. TLS systems, with higher resolution and different incidence angles, offer a method of validation and bias correction for ALS surveys. We present results from the inaugural Airborne Snow Observatory campaign exploring the integration of ALS and TLS technologies in the mountainous Uncompahgre River in southwest Colorado and the Tuolumne River in the Sierra Nevada, California. JF - American Geophysical Union Fall Meeting AU - Deems, J S AU - Finnegan (CRREL), David C AU - Fowler, A AU - Painter, Thomas H AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract G23A EP - 0888 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629942557?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Integration+of+ground-based+and+airborne+LiDAR+data+for+improved+terrain+model+generation&rft.au=Deems%2C+J+S%3BFinnegan+%28CRREL%29%2C+David+C%3BFowler%2C+A%3BPainter%2C+Thomas+H%3BAnonymous&rft.aulast=Deems&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - The GEO water strategy; advances in monitoring, modeling, and predicting groundwater variations at regional to local scales AN - 1629942166; 2014-093358 AB - Groundwater remains one of the most important freshwater resources, especially during droughts and as global warming increases. For informed decisions on managing these resources sustainably, it is important to have sound assessments of the current state of groundwater resources as well as future predictions. This requires reliable groundwater quantity and quality data. However global access to this data is limited. As part of the GEOSS Water Strategy, the International Groundwater Assessment Centre (IGRAC) is therefore implementing the Global Groundwater Monitoring Network (GGMN). The GGMN facilitates periodic assessments of changes in groundwater quantity and quality by aggregating data and information from existing groundwater monitoring networks and regional hydrogeological knowledge. The GGMN is a participatory process that relies upon contributions from regional and national networks of groundwater experts. Such observation data, along with local well data, surface displacements observed by and GPS data and InSAR, and local in situ gravity data, are necessary for evaluation and simulation of groundwater, leading to improved understanding and prediction of groundwater variations. In conjunction with these observations, regional scale groundwater variations are derived as a residual from land surface-groundwater models through extraction of the total mass of water using geo-rectified Gravity Recovery and Climate Experiment (GRACE) data. Such model-based studies have quantified overdraft and regions at risk of groundwater depletion in parts of Asia, US, and Africa. We provide an overview of these systems, planned missions, and new model-based approaches toward local-scale methods for assimilation of well data for several regions. JF - American Geophysical Union Fall Meeting AU - Miller, N L AU - Heinrich, Lena AU - Kukuri, Neno AU - Plag, H AU - Famiglietti, J S AU - Rodell, Matthew AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H12C EP - 08 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629942166?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+GEO+water+strategy%3B+advances+in+monitoring%2C+modeling%2C+and+predicting+groundwater+variations+at+regional+to+local+scales&rft.au=Miller%2C+N+L%3BHeinrich%2C+Lena%3BKukuri%2C+Neno%3BPlag%2C+H%3BFamiglietti%2C+J+S%3BRodell%2C+Matthew%3BAnonymous&rft.aulast=Miller&rft.aufirst=N&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/H/sessions/H12C/abstracts/H12C-08.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Surface processes on a mud-dominated Mars analogue alluvial fan, Atacama Desert, northern Chile AN - 1629941961; 2014-098062 AB - We characterize surface processes on highly unusual terrestrial alluvial fans, which we interpret as a strong analogue for large fans on Mars. The Mars fans date to post-Noachian periods when the martian climate was dominated by cold, hyperarid conditions. Some of the martian fans are differentially eroded to leave their distributary channels in positive relief. This inversion, along with the lack of boulders visible on most fan surfaces, reveals that the dominant grain size of the fans is fine enough for the overbank deposits to be stripped by wind. Degradation, image resolution, and lack of ground truthing all act to obscure the nature of the past flow processes. The fans in the Pampa de Tamarugal of the Atacama Desert of northern Chile are excellent potential Mars analogues for a number of reasons: 1. Hyperaridity, with approximately 2 mm/y rainfall over the fans themselves, resulting in 2. very little vegetation, 3. no fluvial erosion on the fans themselves, and 4. wind-driven erosion of the fan surfaces; 5. equivalent fan scale (tens of km); 6. similar fan gradient (low); 7. low channel branching density; 8. runoff fed from adjacent, much steeper terrain receiving more precipitation ( approximately 500 km (super 2) drainages receiving 0.1-1 m/y precipitation in the High Andes, crater walls and interpreted orographic effects on Mars). Both the modern channels and the preserved stratigraphy are dominated by debris flow-like sheetflow mud deposits. Channels are leveed by concrete-like mass-supported deposits of granules and sand suspended in a silt and clay matrix, often overtopping the channel margins and forming up to 150 m wide levees and km-length sheet flows. This leveeing strongly constrains the aggrading channel, which is typically dominated by better sorted and imbricated fluvial deposits. We infer that the wetter tail of mudlfows sorts the deposits, keeping the central channel unblocked by mud. Relatively few channels are active at any time, but aggradation triggers occasional avulsions. The older, inactive parts of the Atacama fan surface develop partially inverted topography, leaving paleochannels in positive relief. Lack of direct rainfall onto the fan itself means the fan surface is not locally fluvially incised, and the dominant degradation process is aeolian stripping of overbank deposits. Low granular ripples with approximately 1 m spacing are common on the low surfaces, presumably moving by reptation, and part of a partially mobile desert pavement derived primarily from the channel deposits and channel-marginal overbank sediments. Both development of a coarse grain lag on paleochannel ridge crests and cementation of ridge flanks by halite produce the erodability contrast necessary for inversion. JF - American Geophysical Union Fall Meeting AU - Hobley, D E AU - Howard, A D AU - Morgan, A M AU - Matsubara, Y AU - Moore, J M AU - Parsons, R AU - Williams, R M AU - Burr, D M AU - Hayes, A G AU - Dietrich, W AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract EP41C EP - 0809 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629941961?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Surface+processes+on+a+mud-dominated+Mars+analogue+alluvial+fan%2C+Atacama+Desert%2C+northern+Chile&rft.au=Hobley%2C+D+E%3BHoward%2C+A+D%3BMorgan%2C+A+M%3BMatsubara%2C+Y%3BMoore%2C+J+M%3BParsons%2C+R%3BWilliams%2C+R+M%3BBurr%2C+D+M%3BHayes%2C+A+G%3BDietrich%2C+W%3BAnonymous&rft.aulast=Hobley&rft.aufirst=D&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Contribution of groundwater depletion to global mean sea level rise AN - 1629941593; 2014-098291 AB - The contribution of groundwater depletion to Global Mean Sea Level Rise (GMSLR) is an important topic and source of great uncertainty in the GMSLR budget. This research uses gridded GRACE Tellus satellite data to quantify changes in total land water storage, including those of groundwater. Global Land Data Assimilation System land components such as soil moisture, canopy moisture, and snow, are subtracted from the GRACE data to isolate the groundwater component. The resulting trends show that most continents are gaining in groundwater storage, which is consistent with GRACE-based estimates of zero-to-increasing changes in total land water. Results indicate a negative contribution to GMSLR for the GRACE time period, which is in contrast to the positive contribution identified in recent studies. JF - American Geophysical Union Fall Meeting AU - Lambinicio, A AU - An, K AU - Reager, J T AU - Druffel-Rodriguez, R E AU - Richey, A S AU - Famiglietti, J S AU - Rodell, M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract H31F EP - 1186 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629941593?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Contribution+of+groundwater+depletion+to+global+mean+sea+level+rise&rft.au=Lambinicio%2C+A%3BAn%2C+K%3BReager%2C+J+T%3BDruffel-Rodriguez%2C+R+E%3BRichey%2C+A+S%3BFamiglietti%2C+J+S%3BRodell%2C+M%3BAnonymous&rft.aulast=Lambinicio&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - The application of unmanned aerial systems (UAS) in geophysical investigations of geothermal systems AN - 1629938328; 2014-096109 AB - Investigations of geothermal systems typically involve ground-based geological and geophysical studies in order to map structures that control and facilitate fluid flow. The spatial extent of ground-based investigations can be limited, however, by surficial hot springs, dense foliage, and roadless or private lands. This can result in data gaps in key areas, particularly around active hydrothermal springs. Manned aircraft can provide access to these areas and can yield broad and uniform data coverage, but high-resolution surveys are costly and relatively inflexible to changes in the survey specifications that may arise as data are collected. Unmanned aerial systems (UAS) are well suited for conducting these surveys, but until recently, various factors (scientific instrumentation requirements, platform limitations, and size of the survey area) have required the use of large UAS platforms, rendering unmanned aerial surveys unsuitable for most investigations. We have developed and tested a new cesium magnetometer system to collect magnetic data using two different small-platform UAS that overcomes many of the challenges described above. We are deploying this new system in Surprise Valley, CA, to study the area's active geothermal field. Surprise Valley is ideally suited to testing UAS due to its low population density, accessible airspace, and broad playa that provides ample opportunity to safely land the aircraft. In combination with gravity and topographic data, magnetic data are particularly useful for identifying buried, intra-basin structures, especially in areas such as Surprise Valley where highly magnetic, dense mafic volcanic rocks are interbedded with and faulted against less magnetic, less dense sedimentary rock. While high-resolution gravity data must be collected at point locations on the ground, high-resolution magnetic data can be obtained by UAS that provide continuous coverage. Once acquired, the magnetic data obtained by the UAS will be combined with high-resolution airborne lidar data in order to correlate subsurface structures with subtle surface features, to identify possible conduits for, or barriers to, geothermal fluid circulation. Our September 2012 mission will deploy NASA's SIERRA UAS platform to perform a reconnaissance survey of the entire valley. Results from ground and flight tests indicate that magnetic "noise" from the SIERRA platform is low, and can be effectively compensated to provide data comparable with high-resolution commercial methods. A second mission will be flown in summer 2013 using the SWIFT platform, which will analyze data from its onboard sensors to continuously optimize its flight path in real-time to autonomously investigate regions of interest such as steep magnetic gradients or abrupt changes in anomaly amplitudes and wavelengths. The SWIFT also has the advantage that it can be flown as a glider, further reducing magnetic noise of the platform arising from the engine. This innovative use of UAS and intelligent automation in geophysical investigations offers the ability to obtain higher-resolution and more comprehensive and targeted data at a lower cost than is presently possible, expanding our ability to explore a wide variety of geothermal systems. JF - American Geophysical Union Fall Meeting AU - Glen, J M AU - Egger, Anne E AU - Ippolito, Corey A AU - Phelps, G A AU - Berthold, Randall W AU - Lee, Ritchie AU - Spritzer, J M AU - Tchernychev, Misha AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V23F EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 29A:Economic geology, geology of energy sources UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629938328?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+application+of+unmanned+aerial+systems+%28UAS%29+in+geophysical+investigations+of+geothermal+systems&rft.au=Glen%2C+J+M%3BEgger%2C+Anne+E%3BIppolito%2C+Corey+A%3BPhelps%2C+G+A%3BBerthold%2C+Randall+W%3BLee%2C+Ritchie%3BSpritzer%2C+J+M%3BTchernychev%2C+Misha%3BAnonymous&rft.aulast=Glen&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-12-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Meandering channels without vegetation; examples from Nevada and Chile AN - 1623273400; 2014-088028 AB - We report on a study motivated by the occurrence of highly sinuous, actively migrating paleochannels on Mars. Highly sinuous, unconfined meanders require small aspect ratios, which in turn require cohesive channel banks. This cohesion is obtained most commonly by vegetation cover coupled with high suspended sediment loading. The dominant role of vegetation in meandering is reflected in the difficulty in creating highly sinuous channels in flume experiment without introduction of vegetation. The occurrence of strongly meandering channels on Mars suggests meanders can develop in the absence of vegetation. The main objective of our study is to understand the processes of meander evolution in non-vegetated surfaces. We have studied two terrestrial sites in which meandering channels form where vegetation is sparse and has little influence on bank erodibility or point-bar deposition, indicating that there must be other mechanisms creating bank cohesion. One mechanism is stabilization of point-bar deposits by mud drapes. The Quinn River in Nevada is a sinuous channel that flows through fine lacustrine sediments on the floor of paleolake Lahontan resulting in the river having both bed and bank composed of sediment containing least 40% silt/clay. In addition to abundant mud, high salt content of the river water encourages flocculation and settling of fine sediment; thus both high clay/silt content and salt work together at the Quinn River to maintain a small aspect ratio. In contrast to the Quinn River, meandering channels on alluvial fans in the Atacama Desert in northern Chile are deposited by flows originating from the foothills of the Andes Mountains where sediments are coarser and more variable in size. Like Quinn River both fine sediments and salts contribute to meandering. The bank cohesion is provided by mudflows or hyperconcentrated flows creating bank drapes as well as extensive overbank levees which harden to adobe-like consistency. The Atacama Desert is rich in precipitated salts forming salt crusted deposits, and because grains are coarser, we speculate that these salts may possibly be playing a much more direct role in providing the cohesion than they do in the Quinn River. We are using chemical analyses and Scanning Electron Microscope (SEM) images of sediment samples to investigate cementation mechanisms. JF - American Geophysical Union Fall Meeting AU - Matsubara, Y AU - Howard, A D AU - Burr, D M AU - Williams, R M AU - Moore, Jeff M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract EP53H EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 23:Geomorphology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623273400?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Meandering+channels+without+vegetation%3B+examples+from+Nevada+and+Chile&rft.au=Matsubara%2C+Y%3BHoward%2C+A+D%3BBurr%2C+D+M%3BWilliams%2C+R+M%3BMoore%2C+Jeff+M%3BAnonymous&rft.aulast=Matsubara&rft.aufirst=Y&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/EP/sessions/EP53H/abstracts/EP53H-02.html LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Caterpillar-like flow of the Greenland ice sheet; observations of basal control on ice motion AN - 1623262912; 2014-087867 AB - Varying basal motion due to episodic basal water supply is a long-established component of ice flow. However, the physical processes that govern the role of water in basal motion still remain only weakly understood. We instrumented four boreholes at two sites with sensor systems to better understand the processes controlling seasonal flow velocity variations in the marginal zone of the Greenland Ice Sheet. We present measurements of borehole deformation, subglacial water pressure and surface motion during one year (July 2011 to September 2012). Subglacial water pressure and ice deformation show periodic variations on several time scales which are delayed by up to half a period, depending on sensor depth. These observations are interpreted as ice motion in a caterpillar-like fashion, as opposed to the conventionally assumed shear flow. Using a time-dependent, Full-Stokes ice flow model we find that spatially and temporally varying basal motion can explain the observed variations in deformation, and the delayed reaction at different depths. These new data show that the reaction to basal motion is not uniform throughout the ice column, but varies with depth. JF - American Geophysical Union Fall Meeting AU - Ryser, C AU - Luethi, M P AU - Funk, M AU - Catania, G A AU - Andrews, L C AU - Hawley, R L AU - Neumann, T AU - Hoffman, M J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C33B EP - 0662 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623262912?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Caterpillar-like+flow+of+the+Greenland+ice+sheet%3B+observations+of+basal+control+on+ice+motion&rft.au=Ryser%2C+C%3BLuethi%2C+M+P%3BFunk%2C+M%3BCatania%2C+G+A%3BAndrews%2C+L+C%3BHawley%2C+R+L%3BNeumann%2C+T%3BHoffman%2C+M+J%3BAnonymous&rft.aulast=Ryser&rft.aufirst=C&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Preliminary development of digital elevation and relief models for ICESat-2 onboard processing AN - 1623261019; 2014-090317 AB - ATLAS (Advanced Topographic Laser Altimeter System) is a photon-counting laser ranging instrument that will fly onboard NASA's ICESat-2 mission to collect global altimetry data for the primary purpose of determining volumetric changes in the Polar Regions. While photon-counting systems provide the advantage of using small, low power lasers, they are typically much more susceptible to noise and require the use of sophisticated algorithms both onboard and in ground based processing to ensure capture of valid data and production of accurate data products. An onboard receiver algorithm is being developed for ATLAS to ensure that valid data is returned while adhering to the 577 Gb/day limit on data telemetry. The onboard receiver algorithm makes use of multiple onboard databases, two of which are the DEM (Digital Elevation Model) and the DRM (Digital Relief Map). The DEM provides start and stop times for software-induced range gating on the ATLAS detectors, and is a nested, three-tiered grid to account for a 6 km overall constraint on the allowable limit for ranging acquisition. The DRM contains the maximum values of relief seen across 140m- and 700m-long flight path segments, which are used in statistically determining the presence of a valid surface return and in deciding which bands to telemeter. Both onboard databases are to be primarily constructed from existing digital elevation models and must provide global coverage referenced to latitude and longitude. Production of the grids is complicated by the lack of global data products of sufficient resolution and accuracy such that preliminary analysis is required for DEM selection and usage in addition to the determination of how to intelligently merge differing data sets. This initial investigation is also focused on determining the impact of the selected DEM quality on the ICESat-2 onboard algorithms as well as the precipitated error induced on the DRM. These results are required in order to determine the expected acquisition and downlink protocols. Preliminary accuracy studies using ICESat point elevations indicate that regional accuracy affects the accuracy of the DRM to a greater extent than data resolution, and that the accuracy of the DRM is directly correlated to magnitude of relief. The DEM and DRM grids will have a significant impact on the ability of ATLAS and ICESat-2 to acquire and return valid science data, thus it is imperative that they capture the full range of topography in any given area while still keeping with the telemetry constraints on data volume. JF - American Geophysical Union Fall Meeting AU - Leigh, H W AU - Magruder, L A AU - Carabajal, C C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C21C EP - 0605 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623261019?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Preliminary+development+of+digital+elevation+and+relief+models+for+ICESat-2+onboard+processing&rft.au=Leigh%2C+H+W%3BMagruder%2C+L+A%3BCarabajal%2C+C+C%3BAnonymous&rft.aulast=Leigh&rft.aufirst=H&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/10.1130%2FGES00807.1 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-11-13 N1 - CODEN - #07548 ER - TY - JOUR T1 - Impact melt emplacement on the Moon; new results from mini-RF on LRO AN - 1618134813; 2014-083944 AB - Flow-like deposits of impact melt are commonly observed on the Moon, typically around young fresh craters. These flows are thought to be mixtures of clasts and melted material that are emplaced during the late stages of impact crater formation. Lunar impact melts have been primarily studied at optical wavelengths, but complementary information can be obtained by observing impact melts at radar wavelengths. Radar data is sensitive to surface and subsurface roughness, and thus can highlight these features even when they are not easily seen in optical data due to burial or imperfect lighting conditions. Impact melts have been identified in radar data on the lunar near side, but they have yet to be studied in depth on the lunar far side, given the lack of global radar data prior to the launch of NASA's Mini-RF instrument on the Lunar Reconnaissance Orbiter (LRO). We have therefore undertaken a global mapping project to identify impact melt flows in the Mini-RF data set. We seek to use this data to determine how the emplacement of melt deposits is influenced by pre-existing topography and impact direction. We have thus far identified fourteen new impact melt flow candidates, ranging in diameter from 2.8 to 37 km, and confirmed these as impact melt in corresponding LRO NAC imagery. Of the known lunar impact melt flows (those reported here combined with those reported in the literature), over 90% of complex crater flows and 55% of simple crater flows have directions that are within 45 degrees of rim crest low. In comparison, only 50% of complex crater flows and 25% of simple crater flows have directions that are within 45 degrees of the downrange direction of impact. This suggests that for many of these melt flows, pre-existing topography plays an important role in final melt flow morphology. This is likely a result of movement during crater modification (complex craters) or a breached crater rim causing melt to escape and flow outwards (simple craters). JF - American Geophysical Union Fall Meeting AU - Neish, C AU - Carter, L M AU - Bray, V J AU - Hawke, B R AU - Giguere, T AU - Osinski, G R AU - Cahill, J T AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P13D EP - 08 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134813?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Impact+melt+emplacement+on+the+Moon%3B+new+results+from+mini-RF+on+LRO&rft.au=Neish%2C+C%3BCarter%2C+L+M%3BBray%2C+V+J%3BHawke%2C+B+R%3BGiguere%2C+T%3BOsinski%2C+G+R%3BCahill%2C+J+T%3BAnonymous&rft.aulast=Neish&rft.aufirst=C&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Microbial diversity within Juan de Fuca Ridge basement fluids sampled from oceanic borehole observatories AN - 1618134797; 2014-083686 AB - Three generations of sampling and instrumentation platforms known as Circulation Obviation Retrofit Kit (CORK) observatories affixed to Ocean Drilling Program (ODP) and Integrated Ocean Drilling Program (IODP) boreholes are providing unrivaled access to fluids originating from 1.2-3.5 million-years (Myr) old basaltic crust of the eastern flank of the Juan de Fuca ridge. Borehole fluid samples obtained via a custom seafloor fluid pumping and sampling system coupled to CORK continuous fluid delivery lines are yielding critical insights into the biogeochemistry and nature of microbial life inhabiting the sediment-covered basement environment. Direct microscopic enumeration revealed microbial cell abundances that are 2-41% of overlying bottom seawater. Snapshots of basement fluid microbial diversity and community structure have been obtained through small subunit ribosomal RNA (SSU rRNA) gene cloning and sequencing from five boreholes that access a range of basement ages and temperatures at the sediment-basement interface. SSU rRNA gene clones were derived from four different CORK installations (1026B, 1301A, 1362A, and 1362B) accessing relatively warmer (65 degrees C) and older (3.5 Myr) ridge flank, and one location (1025C) accessing relatively cooler (39 degrees C) and younger (1.2 Myr) ridge flank, revealing that warmer basement fluids had higher microbial diversity. A sampling time-series collected from borehole 1301A has revealed a microbial community that is temporally variable, with the dominant lineages changing between years. Each of the five boreholes sampled contained a unique microbial assemblage, however, common members are found from both cultivated and uncultivated lineages within the archaeal and bacterial domains, including meso- and thermophilic microbial lineages involved with sulfur cycling (e.g Thiomicrospira, Sulfurimonas, Desulfocapsa, Desulfobulbus). In addition, borehole fluid environmental gene clones were also closely related to uncultivated lineages recovered from both terrestrial and marine hydrothermal systems (e.g. Candidatus Desulforudis, Candidate Phylum OP8) as well as globally distributed marine sediments (e.g. Miscellaneous Crenarchaeotic Group, JTB35). This analysis provides a framework for future research investigating the evolutionary and functional diversity, population genetics, and activity of the poorly understood habitat. These ongoing sampling expeditions greatly benefit from improvements to both CORK observatories and evolving sampling equipment including microbiologically-friendly materials and dependable access to pristine fluids from the ocean crust. JF - American Geophysical Union Fall Meeting AU - Jungbluth, S AU - Bowers, R M AU - Lin, H AU - Hsieh, C AU - Cowen, J P AU - Rappe, M S AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract B42C EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - East Pacific KW - biodiversity KW - Quaternary KW - Northeast Pacific KW - Integrated Ocean Drilling Program KW - paleoecology KW - Cenozoic KW - Tertiary KW - marine sediments KW - North Pacific KW - Juan de Fuca Ridge KW - Neogene KW - Pacific Ocean KW - sediments KW - Pliocene KW - Ocean Drilling Program KW - 12:Stratigraphy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134797?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geological+Society+of+America+Bulletin&rft.atitle=Fluvial+features+on+Titan%3B+insights+from+morphology+and+modeling&rft.au=Burr%2C+Devon+M%3BPerron%2C+J+Taylor%3BLamb%2C+Michael+P%3BIrwin%2C+Rossman+P%2C+III%3BCollins%2C+Geoffrey+C%3BHoward%2C+Alan+D%3BSklar%2C+Leonard+S%3BMoore%2C+Jeffrey+M%3BAdamkovics%2C+Mate%3BBaker%2C+Victor+R%3BDrummond%2C+Sarah+A%3BBlack%2C+Benjamin+A&rft.aulast=Burr&rft.aufirst=Devon&rft.date=2012-11-21&rft.volume=125&rft.issue=3-4&rft.spage=299&rft.isbn=&rft.btitle=&rft.title=Geological+Society+of+America+Bulletin&rft.issn=00167606&rft_id=info:doi/10.1130%2FB30612.1 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2015-03-19 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - biodiversity; Cenozoic; East Pacific; Integrated Ocean Drilling Program; Juan de Fuca Ridge; marine sediments; Neogene; North Pacific; Northeast Pacific; Ocean Drilling Program; Pacific Ocean; paleoecology; Pliocene; Quaternary; sediments; Tertiary ER - TY - JOUR T1 - Antarctic surface elevation changes caused by variations in the accumulation rate and the firn-compaction rate AN - 1618134772; 2014-083800 AB - In polar ice sheets, short-term variations in the surface elevation are driven by variations in accumulation rate and variations in the rate of firn compaction, which are driven by variations in both temperature and accumulation rate. These short-term variations are superimposed on the long-term changes and are of great importance in the determination of the mass balance of the sheets and changes with time from satellite altimetry. Variations in accumulation rate cause changes in mass, while the affects of both accumulation and temperature on firn-compaction do not involve changes in mass and are applied as corrections to observed elevations. Using our time-dependent firn densification model forced by the near three decades (1982-2011) satellite (AVHRR) observed surface temperature and the accumulation rate, approximated by the p-s (precipitation minus sublimation), from ERA-interim, we calculate the corresponding components of the elevation changes over the Antarctica ice sheet. We also calculate the changes driven by the variations in accumulation rate that is based on the sensitivity (5%/K) of the accumulation to temperature changes for comparison. Results show a general warming in the two periods of altimetry measurements (1992-2001 and 2003-2008) over Antarctica, causing approximately 3 mm a-1 decrease in the surface elevation over the ice sheet from enhanced firn compaction. However, the changes driven by the p-s show an overall decrease of 5 mm a-1 and an increase of 3 mm a-1 for the two periods, with striking differences in West Antarctica. With the advantage of the feature in the treatment of accumulation rate impact on the firn compaction in our model, we have separated the correction part in the elevations changes caused by the accumulation rate variation. JF - American Geophysical Union Fall Meeting AU - Li, Jun AU - Zwally, Jay AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C13F EP - 0684 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134772?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Antarctic+surface+elevation+changes+caused+by+variations+in+the+accumulation+rate+and+the+firn-compaction+rate&rft.au=Li%2C+Jun%3BZwally%2C+Jay%3BAnonymous&rft.aulast=Li&rft.aufirst=Jun&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - The LCROSS ejecta plume revealed; first characterization from Earth-based imaging AN - 1618134564; 2014-083942 AB - On October 9, 2009, the Lunar Crater Observation and Sensing Satellite (LCROSS) struck the floor of Cabeus crater. We observed the LCROSS impact site at 0.5-second intervals throughout the time of impact in the V-band (491 to 591 nm) using the Agile camera on the 3.5 m telescope at the Apache Point Observatory. Our initial analysis of these images showed that the ejecta plume could be no brighter than 9.5 magnitudes/arcsec (super 2) . (Chanover et al. 2011, JGR). We subsequently applied a Principal Component Analysis (PCA) technique to filter out time-varying seeing distortions and image registration errors from an 8-minute sequence of images centered on the LCROSS impact time and unambiguously detected the evolving plume below the noise threshold. This is the first and only reported image detection of the LCROSS plume from ground-based instruments. Our detection is consistent with an ejecta plume that reaches peak brightness between 12 and 20 seconds after impact and fades to an undetectable level within 90 seconds after impact. This is consistent with in situ observations made by the LCROSS Shepherding Satellite (LCROSS S/SC) and the Lunar Reconnaissance Orbiter (LRO) that observed the impact from above (Colaprete et al., and Hayne et. al., 2010, Science). To test our detection method, we compared the brightness profiles derived from our impact image sequence to those extracted from a sequence with a simulated ejecta pattern. We performed 3-D ballistic simulations of trial impacts, starting with initial particle ejection angles and velocities derived from laboratory measurements made with the NASA Ames Vertical Gun of impacts of hollow test projectiles (Hermalyn et. al., 2012, Icarus). We extracted images from these simulations at 0.5-second intervals, combined them with a computer generated lunar landscape, and introduced image distortions due to time-varying seeing conditions and instrumental noise sources to produce a synthetic ejecta image sequence. We then re-extracted the synthetic plume brightness profiles using the identical PCA filtering algorithm used to detect the LCROSS plume and compared results. With this method, we found that the LCROSS plume reached a peak brightness as viewed from Earth of approximately 9.8 magnitudes/arcsec (super 2) . By varying initial particle ejection angles and velocities in our synthetic plume simulations, we were able to create a family of possible brightness profiles to compare to the detected plume. This comparison yielded constraints on the maximum initial plume particle velocities and ejection angles. We present the results of our LCROSS plume detection and discuss the range of constraints on plume initial conditions implied by our model simulations. These ground-based observations provide a unique and complementary view of the LCROSS impact ejecta compared to that provided by LCROSS S/SC and LRO, which observed the plume from above. This Earth-based data set provides a cross-sectional view and therefore provides unique information necessary to constrain initial conditions of the LCROSS ejecta and, by inference, properties of the lunar regolith on the floor of Cabeus crater. JF - American Geophysical Union Fall Meeting AU - Miller, C AU - Chanover, N J AU - Hermalyn, B AU - Strycker, P D AU - Hamilton, R T AU - Suggs, R M AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P13D EP - 06 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134564?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+LCROSS+ejecta+plume+revealed%3B+first+characterization+from+Earth-based+imaging&rft.au=Miller%2C+C%3BChanover%2C+N+J%3BHermalyn%2C+B%3BStrycker%2C+P+D%3BHamilton%2C+R+T%3BSuggs%2C+R+M%3BAnonymous&rft.aulast=Miller&rft.aufirst=C&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Hot as you like it; models of the long-term temperature history of Earth under different geological assumptions AN - 1618134492; 2014-083930 AB - The long-term temperature history of the Earth is a subject of continued, vigorous debate. Past models of the climate of early Earth that utilize paleosol constraints on carbon dioxide struggle to maintain temperatures significantly greater than 0 degrees C. In these models, the incoming stellar radiation is much lower than today, consistent with an expectation that the Sun was significantly fainter at that time. In contrast to these models, many proxies for ancient temperatures suggest much warmer conditions. The surface of the planet seems to have been generally free of glaciers throughout this period, other than a brief glaciation at nearly equal 2.9 billion years ago and extensive glaciation at nearly equal 2.4 billion years ago. Such glacier-free conditions suggest mean surface temperatures greater than 15 degrees C. Measurements of oxygen isotopes in phosphates are consistent with temperatures in the range of 20-30 degrees C; and similar measurements in cherts suggest temperatures over 50 degrees C. This sets up a paradox. Models constrained by one set of geological proxies cannot reproduce the warm temperatures consistent with another set of geological proxies. In this presentation, we explore several potential resolutions to this paradox. First, we model the early Earth under modern-day conditions, but with the lower solar luminosity expected at the time. The next simulation allows carbon dioxide concentrations to increase up to the limits provided by paleosol constraints. Next, we lower the planet's surface albedo in a manner consistent with greater ocean coverage prior to the complete growth of continents. Finally, we remove all constraints on carbon dioxide and attempt to maximize surface temperatures without any geological constraints on model parameters. This set of experiments will allow us to set up potential resolutions to the paradox, and to drive a conversation on which solutions are capable of incorporating the greatest number of geological and geochemical constraints. JF - American Geophysical Union Fall Meeting AU - Domagal-Goldman, S AU - Sheldon, N D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P13B EP - 1936 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 12:Stratigraphy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134492?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Hot+as+you+like+it%3B+models+of+the+long-term+temperature+history+of+Earth+under+different+geological+assumptions&rft.au=Domagal-Goldman%2C+S%3BSheldon%2C+N+D%3BAnonymous&rft.aulast=Domagal-Goldman&rft.aufirst=S&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Organic contaminants library for the sample analysis at Mars AN - 1618134469; 2014-083900 AB - A library containing mass spectra for Sample Analysis at Mars (SAM) materials has been developed with the purpose of contamination identification and control. Based on analysis of the Gas Chromatography-Mass Spectrometric (GCMS) data through thermal desorption, organic compounds were successfully identified from material samples, such as polymers, paints and adhesives. The library contains the spectra for all the compounds found in each of these analyzed files and is supplemented by a file information spreadsheet, a spreadsheet-formatted library for easy searching, and a Perfluorotributylamine (PFTBA) based normalization protocol to make corrections to SAM data in order to meet the standard set by commercial libraries. An example of the library in use can be seen in Figure 1, where the abundances match closely, the spectral shape is retained, and the library picks up on it with an 88% identification probability. Of course, there are also compounds that have not been identified and are retained as unknowns. The library we have developed, along with its supplemental materials, is useful from both organizational and practical viewpoints. Through them we are able to organize large volumes of GCMS data, while at the same time breaking down the components that each material sample is made of. This approach in turn allows us straightforward and fast access to information that will be critical while performing analysis on the data recorded by the SAM instrumentation. In addition, the normalization protocol dramatically increased the identification probability. In SAM GCMS, PFTBA signals were obfuscated, resulting in library matches far away from PFTBA; by using the normalization protocol we were able to transform it into a 92% probable spectral match for PFTBA. The project has demonstrated conclusively that the library is successful in identifying unknown compounds utilizing both the Automated Mass Spectral Deconvolution & Identification System (AMDIS) and the Ion Fingerprint Deconvolution (IFD) software. JF - American Geophysical Union Fall Meeting AU - Misra, P AU - Garcia-Sanchez, R AU - Canham, J AU - Mahaffy, P R AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P13A EP - 1893 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134469?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Organic+contaminants+library+for+the+sample+analysis+at+Mars&rft.au=Misra%2C+P%3BGarcia-Sanchez%2C+R%3BCanham%2C+J%3BMahaffy%2C+P+R%3BAnonymous&rft.aulast=Misra&rft.aufirst=P&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Observations of subglacial water pressure and velocity in the ablation region of Greenland AN - 1618134297; 2014-083732 AB - Subglacial water pressure in boreholes has been correlated with surface speeds on many alpine glaciers with the idea that increases in water pressure reduce the effective pressure, which allows for the ice to decouple from the bed causing sliding. We examine surface and borehole data from the ablation region of the Greenland Ice Sheet to investigate the relationship between water pressure and ice speed. We find that water pressure in boreholes is out of phase with velocities and that water pressure measured in a nearby moulin is in phase with velocities. We explore the possibility that the change of phase between moulin and borehole water pressure is related to two possible processes: 1) diffusion of the pressure wave from the moulin to the borehole sensor (located 150 m away) or 2) sliding near the moulin causes growth of subglacial cavities which permits a pressure drop in the adjacent boreholes. JF - American Geophysical Union Fall Meeting AU - Catania, G A AU - Andrews, L C AU - Hawley, Robert L AU - Hoffman, M J AU - Luethi, M P AU - Neumann, Thomas AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C11A EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134297?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Observations+of+subglacial+water+pressure+and+velocity+in+the+ablation+region+of+Greenland&rft.au=Catania%2C+G+A%3BAndrews%2C+L+C%3BHawley%2C+Robert+L%3BHoffman%2C+M+J%3BLuethi%2C+M+P%3BNeumann%2C+Thomas%3BAnonymous&rft.aulast=Catania&rft.aufirst=G&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Twenty years of changes in Greenland from aircraft laser altimetry collected by Ice Bridge and the PARCA program AN - 1618134079; 2014-083739 AB - In spring of 2012 Operation Ice Bridge, using the NASA P3 aircraft, flew one of the largest airborne surveys of Arctic regions that has ever been accomplished. Many of these flights repeated previous surveys made by the NASA Airborne Topographic Mapper (ATM) in the NASA PARCA Program dating back to the early 1990's. Other flights repeated ICESat-I satellite ground tracks from the past decade. These extensive data sets permit a comprehensive examination of changes and change trends in the Greenland Ice Sheet. Results from comparing these new data with the historical records will be presented. JF - American Geophysical Union Fall Meeting AU - Krabill, William B AU - Martin, C F AU - Sonntag, John G AU - Fredrick, Earl B AU - Manizade, Serdar S AU - Yungel, James K AU - Russell, Robbie AU - Krabill, Kyle A AU - Linkswiler, Matthew A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract C12B EP - 04 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134079?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Twenty+years+of+changes+in+Greenland+from+aircraft+laser+altimetry+collected+by+Ice+Bridge+and+the+PARCA+program&rft.au=Krabill%2C+William+B%3BMartin%2C+C+F%3BSonntag%2C+John+G%3BFredrick%2C+Earl+B%3BManizade%2C+Serdar+S%3BYungel%2C+James+K%3BRussell%2C+Robbie%3BKrabill%2C+Kyle+A%3BLinkswiler%2C+Matthew+A%3BAnonymous&rft.aulast=Krabill&rft.aufirst=William&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - On-going laboratory efforts to quantitatively address clay abundance on Mars AN - 1618134072; 2014-083912 AB - Data obtained at visible and near-infrared wavelengths by OMEGA on MarsExpress and CRISM on MRO provide definitive evidence for the presence of phyllosilicates and other hydrated phases on Mars. A diverse range of both Fe/Mg-OH and Al-OH-bearing phyllosilicates were identified including the smectites, nontronite, saponite, and montmorillonite. In order to constrain the abundances of these phyllosilicates spectral analyses of mixtures are needed. We report on our on-going effort to enable the quantitative evaluation of the abundance of hydrated-hydroxylated silicates when they are contained in mixtures. We include two component mixtures of hydrated/hydroxylated silicates with each other and with two analogs for other martian materials; pyroxene (enstatite) and palagonitic soil (an alteration product of basaltic glass). For the hydrated-hydroxylated silicates we include saponite and montmorillonite (Mg- and Al-rich smectites). We prepared three size separates of each end-member for study: 20-45, 63-90, and 125-150 mu m. As the second phase of our effort we used scanning electron microscopy imaging and x-ray diffraction to characterize the grain size distribution, and structural nature, respectively, of the mixtures. Visible and near-infrared reflectance spectra of the 63-90 mu m grain size of the mixture samples are shown in Figure 1. We discuss the results of our measurements of these mixtures. JF - American Geophysical Union Fall Meeting AU - Roush, T L AU - Bishop, J L AU - Brown, A J AU - Blake, D F AU - Bristow, T F AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P13A EP - 1905 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134072?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=On-going+laboratory+efforts+to+quantitatively+address+clay+abundance+on+Mars&rft.au=Roush%2C+T+L%3BBishop%2C+J+L%3BBrown%2C+A+J%3BBlake%2C+D+F%3BBristow%2C+T+F%3BAnonymous&rft.aulast=Roush&rft.aufirst=T&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Characterising antarctic and Southern Ocean lithosphere with magnetic and gravity imaging of East Antarctic rift systems AN - 1618132164; 2014-086109 AB - Since the International Geophysical Year (1957), a view has prevailed that the lithospheric structure of East Antarctica is relatively homogeneous, forming a geological block of largely cratonic nature, consisting of a mosaic of Precambrian terranes, stable since the Pan-African Orogeny approximately 500 million years ago. Recent recognition of a continental-scale rift system cutting the East Antarctic interior indicates that this is incorrect, and has crystallized an alternative view of much more recent geological activity with important implications for tectonic reconstructions and controls on ice sheet formation and stability. The newly defined East Antarctic Rift System appears to extend from at least the South Pole to the continental margin at the Lambert Rift, a distance of 2500 km. This is comparable in scale to the well-studied East African rift system. New analysis of RadarSat data pioneered by Golynsky & Golynsky indicates that further rift zones may extend the East Antarctic Rift System into widely distributed extension zones within the continent. We have carried out a pilot study, using a newly developed gravity inversion technique with existing public domain satellite data, which shows that East Antarctica consists of distinct crustal thickness provinces with anomalously thick areas separated by thin, possibly rifted crust and overall high average thickness. Understanding the nature of crustal thickness in East Antarctica is critical because: 1) Better understanding of crustal thickness in Antarctica, especially along the ocean-continent transition (OCT), will make it possible to improve the plate reconstruction fit between Antarctica, Australia and India in Gondwana and also refine constraints on how and when these continents separated; 2) crustal thickness provinces can be used to aid supercontinent reconstructions and provide new assessments of the influence of basement architecture and mechanical properties on rifting processes; 3) tracking rift zones through East Antarctica will identify the plate-scale geometry of zones of crustal and lithospheric thinning; 4) understanding when and how East Antarctica acquired its thick crust and high elevation, and why it is so thick and elevated, will place new constraints on models of Cenozoic ice sheet formation and stability. The crustal thickness map for East Antarctica will make it possible to produce a multi-dataset-based geothermal heatflux map for the continent. Estimating the heat flux in the Gamburtsev Subglacial Mountains (GSM) region is particularly critical because: 1) The GSM likely acted as key nucleation point for the East Antarctic Ice Sheet (EAIS); 2) the region may contain the oldest ice of the EAIS--a prime target for future ice core drilling; 3) geothermal heat flux is important to understand proposed ice accretion at the base of the EAIS in the GSM and its links to sub-ice hydrology; 4) an integrated multi-dataset-based geothermal heatflux model for East Antarctica will resolve the wide range of estimates previously published using single datasets. JF - American Geophysical Union Fall Meeting AU - Vaughan, A P AU - Kusznir, N J AU - Ferraccioli, F AU - Jordan, T A AU - Purucker, M E AU - Golynsky, A V AU - Rogozhina, I AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract T41B EP - 2583 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618132164?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Characterising+antarctic+and+Southern+Ocean+lithosphere+with+magnetic+and+gravity+imaging+of+East+Antarctic+rift+systems&rft.au=Vaughan%2C+A+P%3BKusznir%2C+N+J%3BFerraccioli%2C+F%3BJordan%2C+T+A%3BPurucker%2C+M+E%3BGolynsky%2C+A+V%3BRogozhina%2C+I%3BAnonymous&rft.aulast=Vaughan&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Toward a taxonomy of asteroid spectra in the 3-mu m region AN - 1618131869; 2014-084012 AB - Introduction and observations: The 3-mu m spectral region is critical for measuring the presence and distribution of volatiles. On asteroids, absorptions due to OH in minerals and H2O as ice have been reported in this spectral range by several worker since the 1970s (for instance, [1-5]) With the installation of the SpeX instrument at the NASA IRTF [6], observations of asteroids in the 2-4 mu m region ("LXD mode") are now commonplace. As a result of the ease of observations, a de facto SpeX LXD-mode asteroid survey has been ongoing for the past decade. At this writing, 97 low-albedo asteroids (C complex, D and T asteroids, and low-albedo members of the X complex), which are the focus of this work, have been observed 142 times. Band shapes and classes: A range of 3-mu m band shapes is seen in the asteroid population. Several "Type examples" of the 3-mu m classes have been identified: "Pallas types", with roughly linear band shapes and band minima in the 2.5-2.85 mu m region (where atmospheric water vapor precludes ground-based observations), "Ceres types" with a narrow band centered near 3.05 mu m, and "Themis types" with a broader, rounded absorption near 3.1 mu m. Both Ceres and Themis have had compositional fits made to their spectra [4,12], but while we expect objects with similar spectra to share similar compositions, formal fits to other Ceres- and Themis-type objects remain future work. Takir and Emery find similar band shapes in their sample, though they use different names for their groupings [5]. We are moving toward developing more quantifiable criteria for classifications. One possible approach involves the band depths at 3.2 and 2.9 mu m. When these are plotted against each other, an array of points with similar band shapes but differing band depths is found in both the asteroid data and mineralogical and meteoritical spectra [13,14], all appearing as Pallas types by inspection. In addition to that array, a second cluster of points is found where the 3.2 mu m band depth > or = 2.9 mu m band depth: the non-Pallas types. There is an excellent correlation between the Ch asteroids in the Bus-DeMeo taxonomy and the Pallas types: 29 of 31 Ch objects in the sample are clearly Pallas-types, with the remaining two ambiguous but likely Pallas-types. Future Work: The use of band depth plots shows promise of separating these spectral types from one another, but more work is required to identify the optimal wavelengths. In addition, we have begun exploring the use of principal component analysis (PCA), as has been done for shorter-wavelength data. We also hope to use data from other asteroids and perhaps icy satellites to help guide our analysis. JF - American Geophysical Union Fall Meeting AU - Rivkin, A AU - Howell, E S AU - Emery, J P AU - Volquardsen, E L AU - DeMeo, F E AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract P31A EP - 1878 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618131869?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Toward+a+taxonomy+of+asteroid+spectra+in+the+3-mu+m+region&rft.au=&rft.aulast=&rft.aufirst=&rft.date=2012-11-30&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=CONSTELLATION+PROGRAM%2C+BREVARD+AND+VOLUSIA+COUNTIES%2C+FLORIDA%3B+HANNCOCK+COUNTY%2C+MISSISSIPPI%3B+ORLEANS+PARISH%2C+LOUISIANA%3B+HARRIS+COUNTY%2C+TEXAS%3B+MADISON+COUNTY%2C+ALABAMA%3B+CUYAHOGA+AND+ERIE+COUNTIES%2C+OHIO%3B+HAMPTON%2C+VIRGINIA%3B+SANTA+CLARA+COUNTY%2C+CALIFORNIA%3B+DONA+ANA+AND+OTERO+COUNTIES%2C+NEW+MEXICO%3B+AND+BOX+ELDER+AND+DAVIS+COUNTIES%2C+UTAH+%28ADOPTION+OF+THE+NASA+FINAL+PROGRAMMATIC+EIS+OF+JANUARY+2008%29.&rft.title=CONSTELLATION+PROGRAM%2C+BREVARD+AND+VOLUSIA+COUNTIES%2C+FLORIDA%3B+HANNCOCK+COUNTY%2C+MISSISSIPPI%3B+ORLEANS+PARISH%2C+LOUISIANA%3B+HARRIS+COUNTY%2C+TEXAS%3B+MADISON+COUNTY%2C+ALABAMA%3B+CUYAHOGA+AND+ERIE+COUNTIES%2C+OHIO%3B+HAMPTON%2C+VIRGINIA%3B+SANTA+CLARA+COUNTY%2C+CALIFORNIA%3B+DONA+ANA+AND+OTERO+COUNTIES%2C+NEW+MEXICO%3B+AND+BOX+ELDER+AND+DAVIS+COUNTIES%2C+UTAH+%28ADOPTION+OF+THE+NASA+FINAL+PROGRAMMATIC+EIS+OF+JANUARY+2008%29.&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-30 N1 - CODEN - #07548 ER - TY - JOUR T1 - Seismic rate changes associated with seasonal, annual, and decadal changes in the cryosphere AN - 1612262858; 2014-080011 AB - Near the Bering Glacier Global Fiducial Program (GFP) in southern Alaska large cryospheric fluctuations occur in a region of upper crustal faulting and folding associated with collision and accretion of the Yakutat terrane. In this study we report constraints on seasonal, annual and decadal cryospheric changes estimated over the last decade from field, aircraft and satellite measurements and we evaluate the influence of cryospheric changes on the background seismic rate. Multi-year images from the Bering Glacier GFP are available since mid-2003 to constrain changes in extent of the Bering Glacier and to discern feature changes in the glacial surface. Starting around the same time, satellite gravimetric measurements from the Gravity Recovery and Climate experiment (GRACE) commenced. Large spatial-scale mass change calculated from the GRACE mascon solution of Luthcke et al. [2012] indicate a general trend of annual ice mass loss for southern Alaska but with large, variable seasonal mass fluctuations. Since 2007 the station position of a continuous GPS site near Cape Yakataga (Alaska EarthScope PBO site, AB35) has been available as well. In addition to changes in the geodetic position due to tectonic motion, this GPS station shows large seasonal excursions in the detrended vertical and horizontal position components consistent with snow loading in the fall and winter and melt onset/mass decrease in the spring/summer. To better understand the timing of processes responsible for the onset of cryospheric mass loss documented in the GRACE data, we examined changes in the snow cover extent and the onset of melt in the spring. We calculated the elastic displacements of the solid Earth and theoretical earthquake failure criteria associated with these annual and seasonal ice and snow changes. Additionally, we compared the seismic rate (M>1.8) from a reference background time period against other time periods with variable ice or tectonic change characteristics to test the significance of seismic rate changes. Our earlier results suggest statistically significant changes in the background seismic rate associated with large seasonal mass changes. JF - American Geophysical Union Fall Meeting AU - Sauber, J M AU - Luthcke, S B AU - Hall, D K AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract ED34A EP - 06 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1612262858?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Seismic+rate+changes+associated+with+seasonal%2C+annual%2C+and+decadal+changes+in+the+cryosphere&rft.au=Sauber%2C+J+M%3BLuthcke%2C+S+B%3BHall%2C+D+K%3BAnonymous&rft.aulast=Sauber&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-16 N1 - CODEN - #07548 ER - TY - JOUR T1 - The response of ozone and nitrogen dioxide to the eruption of Mt. Pinatubo at southern and northern midlatitudes AN - 1566816109; 2014-077768 AB - Observations have shown that the global mass of nitrogen dioxide decreased at midlatitudes in both hemispheres in the year following the eruption of Mt. Pinatubo, indicating an enhanced heterogeneous chemistry due to the presence of the volcanic aerosol. In contrast, the observed ozone response at southern and northern midlatitudes was largely asymmetrical with respect to the equator, with a general decrease at northern midlatitudes and little change and even a small increase at southern midlatitudes. Simulations including enhanced heterogeneous chemistry but no other direct effects of the volcanic aerosol reproduce a decrease of ozone in both hemispheres, contrary to observations. Our simulations show that the heating due to the volcanic aerosol enhanced both the tropical upwelling and, subsequently, the extratropical downwelling. The enhanced extratropical downwelling, combined with the time of the eruption relative to the phase of the Brewer-Dobson circulation, increased the ozone in the southern hemisphere and counteracted the ozone depletion due to heterogeneous chemistry on volcanic aerosol. JF - American Geophysical Union Fall Meeting AU - Aquila, Valentina AU - Oman, Luke D AU - Stolarski, R S AU - Douglass, Anne R AU - Newman, Paul A AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract A53P EP - 0424 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566816109?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+response+of+ozone+and+nitrogen+dioxide+to+the+eruption+of+Mt.+Pinatubo+at+southern+and+northern+midlatitudes&rft.au=Aquila%2C+Valentina%3BOman%2C+Luke+D%3BStolarski%2C+R+S%3BDouglass%2C+Anne+R%3BNewman%2C+Paul+A%3BAnonymous&rft.aulast=Aquila&rft.aufirst=Valentina&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-10-02 N1 - CODEN - #07548 ER - TY - JOUR T1 - Lava-substrate heat transfer; laboratory experiments and thermodynamic modeling AN - 1560083285; 2014-067143 AB - We have performed laboratory experiments and numerical modeling to investigate the heat transfer from a lava flow into various substrate materials, focusing on the effects of the differing thermophysical properties of substrate materials. Initial motivation for this project developed from the desire to understand the loss of solar wind volatiles embedded in lunar regolith deposits that were subsequently covered by a lava flow. The Moon lacks a significant atmosphere and magnetosphere, leaving the surface regolith exposed to bombardment by solar flare and solar wind particles, and by the cosmogenic products of galactic cosmic rays. Preservation of particle-rich regolith deposits may have occurred by the emplacement of an active lava flow on top of the regolith layer, provided the embedded particles survive heating by the lava. During future expeditions to the lunar surface, ancient regolith deposits could be sampled through surface drilling to extract the extra-lunar particles, revealing a history of the solar activity and galactic events not available on the Earth. This project also has important implications for terrestrial lava flows, particularly in the prediction of lava flow hazards. Lava erupted on Earth may be emplaced on various substrates, including solid lava rock, volcanic tephra, sands, soils, etc. The composition, grain size, consolidation, moisture content, etc. of these materials will vary greatly and have different effects on the cooling of the flow. Accounting for specific properties of the substrate could be an important improvement in lava flow models We have performed laboratory experiments in collaboration with the Department of Art and Art History at the University of Hawaii at Manoa in which approximately 5-6 kg of basalt, collected at Kilauea Volcano, Hawaii, is melted to approximately 1200 degrees C. The lava is poured into a device constructed of calcium silicate sheeting that has been filled with a solid or particulate substrate material and embedded with thermocouples. Internal temperatures are monitored by the thermocouple array, while external temperatures are monitored by a Forward Looking Infrared Radiometer (FLIR) video camera. The experimental data thus describe the cooling rates of the system, and reveal the release of latent heat of crystallization within the cooling lava. These experiments have been conducted in conjunction with numerical simulations of the heat transfer from a lava flow into various substrates, to quantify the depth reached by the heat pulse as it penetrates the substrate. Models include material-specific, temperature-dependent thermophysical properties, including thermal conductivity, specific heat capacity, and latent heat of crystallization. We find that particulate materials, such as lunar regolith, sand, and soils will be heated to depths shallower than solid materials. In addition, the particulate materials will act as insulators, shielding the lava flow from basal cooling and maintaining high temperatures in the flow core. These results suggest that lava flows emplaced on a dry particulate terrain will remain above solidus for a longer duration, allowing the lava to flow further than when emplaced on a solid substrate. JF - American Geophysical Union Fall Meeting AU - Rumpf, M AU - Fagents, Sarah A AU - Hamilton, C W AU - Wright, R AU - Crawford, I AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V11B EP - 2764 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1560083285?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Lava-substrate+heat+transfer%3B+laboratory+experiments+and+thermodynamic+modeling&rft.au=Rumpf%2C+M%3BFagents%2C+Sarah+A%3BHamilton%2C+C+W%3BWright%2C+R%3BCrawford%2C+I%3BAnonymous&rft.aulast=Rumpf&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-09-05 N1 - CODEN - #07548 ER - TY - JOUR T1 - Dispersion of volcanic aerosol from Mt. Nabro (2011) in the UTLS using CALIPSO observations and trajectory mapping AN - 1553089979; 2014-063504 AB - We use cloud-filtered nighttime measurements of scattering ratio from CALIOP, and a Lagrangian trajectory model to study the dispersion of volcanic aerosol from the eruption of Mt. Nabro (Ethiopia/Eritrea) in June 2011. The CALIOP observations show that the volcanic plume reached the low stratosphere within 2 days of the main eruption, with the bulk of material between 380-420K potential temperature. Cloud top brightness temperatures from SEVIRI/Meteosat-9 indicate a direct injection of volcanic material into the low stratosphere from the eruption. AIRS/Aqua measurements show a significant enhancement of SO2 in the plume. Volume depolarization ratios from CALIOP indicate a mixture of ash and newly formed sulfate aerosol. Much of the plume was entrained initially into the Asian summer anticyclone, which extends from the Mediterranean to China. Detrainments from the anticyclone in early July followed two principal transport pathways: (1) westward across the Atlantic, in tropical easterlies, and (ii) eastward across the Northern Pacific in westerly winds, leading to dispersion of the plume throughout Northern mid-latitudes by August. We use our trajectory-mapped analyses of CALIOP data to interpret observations made from ground-based and airborne lidars, and to compute estimates of aerosol optical depth, top-of-atmosphere radiative forcing, and heating profile contributions, associated with the dispersed plume. JF - American Geophysical Union Fall Meeting AU - Fairlie, T D AU - Vernier, Jean-Paul AU - Thomason, L W AU - Natarajan, Murali AU - Minnis, Patrick AU - Bedka, Kristopher M AU - Palikonda, Rabindra AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract A21K EP - 08 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553089979?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Dispersion+of+volcanic+aerosol+from+Mt.+Nabro+%282011%29+in+the+UTLS+using+CALIPSO+observations+and+trajectory+mapping&rft.au=Fairlie%2C+T+D%3BVernier%2C+Jean-Paul%3BThomason%2C+L+W%3BNatarajan%2C+Murali%3BMinnis%2C+Patrick%3BBedka%2C+Kristopher+M%3BPalikonda%2C+Rabindra%3BAnonymous&rft.aulast=Fairlie&rft.aufirst=T&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 ER - TY - JOUR T1 - Measurement based analysis of physical, chemical, morphological, and optical properties of dust over the Indo-Gangetic Basin AN - 1553089732; 2014-063561 AB - A study is conducted in campaign mode at Kanpur (26.52N, 80.23E), India, during April to July 2011, to study the physical, chemical, optical, and morphological properties of dust over the Indo-Gangetic basin. The main objectives are to study various characteristic properties of mineral dust, modification in these properties due to long-range transport and mixing with pollution, and to identify dust proxies based on chemical analysis. The duration of campaign witnesses heavy dust storms and the onset of South West Indian Monsoon. AERONET measured Aerosol Optical Depth (AOD) at 500 nm during April to June is observed to vary from 0.2 to 1.2. The aerosol types encountered are classified among Dust, Polluted Dust, Burning, and Continental categories which represent the prevalent aerosol scenario in the region during this period. As reflected in the measured aerosol size distributions, burning generated aerosols have bimodal distribution, whereas Dust and Polluted Dust have trimodal distribution. Based on HYSPLIT calculated 10-day back trajectory analysis, Nepal and the desert regions of NW India are identified as sources of aerosols associated with burning events and dust dominated days respectively. MPLNET derived aerosol extinction profiles show that during dusty days, particles reach up to a height of approximately 5 km. In June and July, surface measured Absorption Coefficient reduced nearly half the value in April and May, while surface measured Extinction Coefficient almost gets doubled. From pre-monsoon to monsoon period, SSA increased from 0.76 to 0.95, while Bext showed three times growth. High values of SSA (Greater than average, 0.83-0.87) are observed on dust events. SEM images of collected aerosol samples show different particle shapes e. g., rhombic, platelets, and parallelepiped. XRF analyses of aerosol samples show the presence of Al, Ti, Fe, Ca, Mg, and K in PM10 samples collected on dust dominated days, and high S content in PM2.5 for burning events. A noticeable characteristic of this analysis is higher Ca/Fe ratio and high K/Al ratio for dust and burning events, respectively. Dominance of SO (sub 4) (super 2-) is observed in ion analysis (Na+, NH4+, K+, Ca2+, Mg2+, Cl-, NO3-, SO (sub 4) (super 2-) ) of the PM2.5 and PM10 samples as per the average concentration. JF - American Geophysical Union Fall Meeting AU - Misra, A AU - Gaur, A AU - Bhattu, D AU - Ghosh, S AU - Dwivedi, A K AU - Dalai, Rosalin AU - Paul, D AU - Gupta, Tarun AU - Mishra, S K AU - Singh, S AU - Welton, Ellsworth J AU - Tripathi, S N AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract A33D EP - 0197 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553089732?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Measurement+based+analysis+of+physical%2C+chemical%2C+morphological%2C+and+optical+properties+of+dust+over+the+Indo-Gangetic+Basin&rft.au=Misra%2C+A%3BGaur%2C+A%3BBhattu%2C+D%3BGhosh%2C+S%3BDwivedi%2C+A+K%3BDalai%2C+Rosalin%3BPaul%2C+D%3BGupta%2C+Tarun%3BMishra%2C+S+K%3BSingh%2C+S%3BWelton%2C+Ellsworth+J%3BTripathi%2C+S+N%3BAnonymous&rft.aulast=Misra&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 ER - TY - JOUR T1 - Injection of water into the stratosphere by moderate volcanic eruptions AN - 1553087842; 2014-063547 AB - Three soundings of water vapor using cryogenic frostpoint hygrometers launched in June 2011 at Beltsville, MD, USA; Lindenberg, Germany; and Sodankyla, Finland, show layers of strongly enhanced water vapor in the stratosphere. This enhancement was up to 30% above the mean value or 1 ppmv above the largest value previously observed at these stations. Trajectory analysis traces these events back to a volcanic eruption which took place at Grimsvotn volcano Iceland on 21-28 May 2011. Observations of the initial eruption plume indicated plume top altitudes exceeding 20 km. The eruption of Grimsvotn may have had ample supply of water especially in the early phase of the eruption, due to caldera geothermal water or meltwater from its ice cap. Thus, this moderate Plinian eruption may have injected significant amounts of water vapor well into the stratosphere and may thus be contributing to the source term of stratospheric water vapor. Simultaneous observations of aerosol backscatter at Lindenberg indicate the absence of particles, implying that volcanic particles were injected to this altitude were too large and fell out over the time of transport, or that their concentration was too low. Volcanic injections of water vapor into the lower and middle stratosphere may go unnoticed by observing systems other than in situ observations and may therefore be underestimated due to lack of available data. JF - American Geophysical Union Fall Meeting AU - Voemel, Holger AU - Whiteman, David N AU - Kivi, Rigel AU - Petersen, G AU - Arason, P AU - Wienhold, Frank AU - Demoz, B AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract A31A EP - 0010 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1553087842?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Injection+of+water+into+the+stratosphere+by+moderate+volcanic+eruptions&rft.au=Voemel%2C+Holger%3BWhiteman%2C+David+N%3BKivi%2C+Rigel%3BPetersen%2C+G%3BArason%2C+P%3BWienhold%2C+Frank%3BDemoz%2C+B%3BAnonymous&rft.aulast=Voemel&rft.aufirst=Holger&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-08-14 N1 - CODEN - #07548 ER - TY - JOUR T1 - First results from the CheMin, DAN and SAM instruments on Mars Science Laboratory AN - 1549621318; 2014-056994 AB - One of the principal goals of the Mars Science Laboratory rover Curiosity is to identify and characterize the early habitable environments of Mars, as recorded in the stratified rocks and soil of Gale crater. The suite of instruments aboard Curiosity will make measurements useful for determining the presence and lateral/vertical distribution of hydrated phases, the mineralogy and "preservation potential" of sediments and rocks, and the identity and isotopic composition of organic and other carbon containing molecules, should such be present. Three of Curiosity's instruments, DAN ("Dynamic Albedo of Neutrons," a soil hydrogen detector), CheMin ("Chemistry and Mineralogy," a mineralogy instrument) and SAM ("Surface Analysis at Mars," an organic molecule and isotopic analysis instrument) are uniquely suited to this purpose. DAN consists of a pulsed neutron generator and neutron detector that will measure the hydrogen content (i.e., hydrated phases, water ice) in the upper meter of the soil. Both passive and active measurements will be obtained, resulting in a meter-scale resolution transect map of near-surface hydrogen along the path of the rover. These measurements will provide context for the mineralogical and organic measurements of drilled and scooped samples analyzed by CheMin and SAM. CheMin, a powder X-ray Diffraction (pXRD) instrument, will determine the mineralogy of scooped soils and powders obtained from drilled rocks. Hydrated minerals will be identified, along with whole-rock mineralogy for characterizing the environment of formation and preservation potential for organic molecules. SAM consists of a sample handling system, a gas chromatograph, a mass spectrometer, and a tunable laser spectrometer. SAM will accept the same powdered rock and soil samples as CheMin, and will measure and identify organic carbon in these samples as well as evolved inorganic gases such as CO2, CH4, and H2O. Isotopic composition of noble gases and several light elements are measured in these gases and in those sampled from the atmosphere. First measurements from these instruments will be obtained subsequent to (and in some cases in concert with) rover commissioning activity tests, during the first 30-60 days of the mission. We anticipate that measurements of subsurface hydrogen from DAN, atmospheric gas measurements from SAM, and mineralogical measurements of the first scooped or drilled surface material will be obtained during this period. JF - American Geophysical Union Fall Meeting AU - Blake, David F AU - Mahaffy, Paul R AU - Mitrofanov, Igor AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract U13A EP - 03 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621318?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=First+results+from+the+CheMin%2C+DAN+and+SAM+instruments+on+Mars+Science+Laboratory&rft.au=Blake%2C+David+F%3BMahaffy%2C+Paul+R%3BMitrofanov%2C+Igor%3BAnonymous&rft.aulast=Blake&rft.aufirst=David&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/U/sessions/U13A/abstracts/U13A-03 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - The Mars science laboratory mission: early results from Gale Crater landing site AN - 1549621211; 2014-056992 AB - The Mars Science Laboratory rover, Curiosity, landed at Gale Crater on August 5th (PDT) and initiated an investigation of modern and ancient environments. The 155-km diameter Gale Crater was chosen as Curiosity's field site based on several attributes: the interior Mount Sharp preserves a succession of flat-lying strata extending almost 5 km above the elevation of the landing site; the lower few hundred meters of the mound show a progression with relative age from clay-bearing to sulfate-bearing strata, separated by an unconformity from overlying likely anhydrous strata; the landing ellipse is characterized by a mixture of alluvial fan and high thermal inertia/high albedo stratified deposits; and a number of stratigraphically/geomorphically distinct fluvial features. Gale's regional context and strong evidence for a progression through multiple potentially habitable environments, represented by a stratigraphic record of extraordinary extent, ensure preservation of a rich record of the environmental history of early Mars. Curiosity has an expected lifetime of at least one Mars year ( approximately 23 months), and drive capability of at least 20 km. The MSL science payload was specifically assembled to assess habitability and includes a gas chromatograph-mass spectrometer and gas analyzer that will search for organic carbon in rocks, regolith fines, and the atmosphere (SAM); an x-ray diffractometer that will determine mineralogical diversity (CheMin); focusable cameras that can image landscapes and rock/regolith textures in natural color (MAHLI, Mastcam); an alpha-particle x-ray spectrometer for in situ determination of rock and soil chemistry (APXS); a laser-induced breakdown spectrometer to remotely sense the chemical composition of rocks and minerals (ChemCam); an active/passive neutron spectrometer designed to search for water in rocks/regolith (DAN); a weather station to measure modern-day environmental variables (REMS); and a sensor designed for continuous monitoring of background solar and cosmic radiation (RAD; Cruise measurements began on December 6, 2011). The MARDI descent camera is being evaluated for use in the surface mission. The Sample Acquisition, Processing, and Handling (SA/SPaH) subsystem is responsible for the acquisition of rock and soil samples from the Martian surface and the processing of these samples into fine particles that are then distributed to the analytical science instruments (CheMin and SAM). The SA/SPaH subsystem is also responsible for the placement of the two contact instruments (APXS, MAHLI) on rock and soil targets. SA/SPaH consists of a robotic arm and turret-mounted devices on the end of the arm, which include a drill, brush, soil scoop, sample processing device, and the mechanical and electrical interfaces to the two contact science instruments. SA/SPaH also includes two spare drill bits, five organic check material samples, and an observation tray, which are all mounted on the front of the rover, and inlet cover mechanisms that are placed over the SAM and CheMin solid sample inlet tubes on the rover top deck. Recent mission results will be discussed. The first month or two of the mission is designed as a Commissioning Activity Period (CAP) in which each science instrument and rover subsystem is tested in sequence, but done in a fashion that insures science measurements also are obtained. JF - American Geophysical Union Fall Meeting AU - Grotzinger, J P AU - Blake, David F AU - Crisp, J A AU - Edgett, K S AU - Gellert, R AU - Gomez-Elvira, J AU - Hassler, D M AU - Mahaffy, Paul R AU - Malin, M C AU - Meyer, Michael A AU - Mitrofanov, Igor AU - Vasavada, Ashwin R AU - Wiens, R C AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract U13A EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549621211?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+Mars+science+laboratory+mission%3A+early+results+from+Gale+Crater+landing+site&rft.au=Grotzinger%2C+J+P%3BBlake%2C+David+F%3BCrisp%2C+J+A%3BEdgett%2C+K+S%3BGellert%2C+R%3BGomez-Elvira%2C+J%3BHassler%2C+D+M%3BMahaffy%2C+Paul+R%3BMalin%2C+M+C%3BMeyer%2C+Michael+A%3BMitrofanov%2C+Igor%3BVasavada%2C+Ashwin+R%3BWiens%2C+R+C%3BAnonymous&rft.aulast=Grotzinger&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/U/sessions/U13A/abstracts/U13A-01 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Origin and mixing timescale of Earth's late veneer AN - 1549620176; 2014-057209 AB - Experimental studies on the partitioning behavior of highly siderophile elements (HSE) between silicate and metallic melts imply that the Earth's mantle should have been highly depleted in these elements by core formation in an early magma ocean. However, present HSE contents of the Earth's mantle are approximately 3 orders of magnitude higher than that expected by experiments. The apparent over-abundance of HSE has commonly been explained by the addition of meteoritic material in the "late veneer" which describes the exogenous mass addition following the moon forming impact and concluding with the late heavy bombardment at approximately 3.8-3.9 Ga. The strongest evidence for this theory is that the platinum group element (PGE) contents in today's mantle are present in chondritic relative abundances, as opposed to a fractionated pattern expected with metal-silicate partitioning. Archean komatiites indicate that the PGE content of the Earth's mantle increased from about half their present abundances at 3.5 Ga to their present abundances at 2.9 Ga. This secular increase in PGE content suggests a progressive mixing of the late veneer material into the Earth's mantle. However, this time scale also implies that the whole mantle was relatively well mixed by 2.9 Ga. We use a compilation of existing isotopic and trace element data in order to constrain the origin and composition of the late veneer. We use PGE abundances, W abundances and W isotopic compositions in chondritic meteorites and the primitive upper mantle to compute the amount of mass delivered during the late veneer and find the late veneer mass to be approximately 0.6% the mass of the bulk silicate Earth (consistent with earlier estimates). We also use the (super 187) Re- (super 187) Os and (super 190) Pt- (super 186) Os systems to constrain the composition and timing of delivery of the impacting population. We model the efficiency of mantle mixing in this time frame by using 3-dimensional numerical geodynamical simulations and geochemical constraints. Initial parameters include the amount of mass delivered in the late veneer and the Archean internal heating which is at least 4 times higher than the present values, due to the higher abundance of radioactive elements. Another important parameter is the mechanism of mass addition to the Earth. We test three end-member scenarios: (1) a single very large impactor accounting for the entire mass addition, (2) sprinkling of a large number of small impactors over the whole Earth which then mix into the mantle, or (3) by using a size/frequency distribution estimated from the lunar cratering record and corrected for the difference in gravitational cross section of the Earth and the Moon. This project results from collaborations begun at the CIDER II workshop held at KITP, UCSB, 2012. JF - American Geophysical Union Fall Meeting AU - Prescher, Clemens AU - Allu Peddinti, Divya AU - Bell, E A AU - Bello, Lea AU - Cernok, Ana AU - Ghosh, N AU - Tucker, J AU - Wielicki, M M AU - Zahnle, K J AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V51B EP - 2775 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620176?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Origin+and+mixing+timescale+of+Earth%27s+late+veneer&rft.au=Prescher%2C+Clemens%3BAllu+Peddinti%2C+Divya%3BBell%2C+E+A%3BBello%2C+Lea%3BCernok%2C+Ana%3BGhosh%2C+N%3BTucker%2C+J%3BWielicki%2C+M+M%3BZahnle%2C+K+J%3BAnonymous&rft.aulast=Prescher&rft.aufirst=Clemens&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - Overview of the atmosphere and environment within Gale Crater on Mars AN - 1549619959; 2014-056993 AB - Curiosity's mission at Gale Crater places a number of highly capable atmospheric and environmental sensors within a dynamic setting: next to a 5-km mountain within a 150-km diameter impact crater whose floor is -4.5 km. Curiosity's scientific payload was chosen primarily to allow a geologic and geochemical investigation of Mars' environmental history and habitability, as preserved in the layered sediments on the crater floor and mound. Atmospheric and environmental sensors will contribute by measuring the bulk atmospheric chemical and isotopic composition, the flux of high-energy particle and ultraviolet radiation after modification by the atmosphere, and modern processes related to meteorology and climate over at least one Mars year. The Sample Analysis at Mars instrument will analyze the atmosphere with its mass spectrometer and tunable laser spectrometer. The former is capable of providing bulk composition and isotopic ratios of relevance to planetary evolution, such as nitrogen and noble gases. The latter is designed to acquire high-precision measurements of atmospheric species including CH4, CO2, and H2O, and key isotope ratios in H, C, and O. An important goal will be to compare CH4 abundance and time variability over the mission with the reported detections from the Mars Express orbiter and ground-based observations. The Radiation Assessment Detector (RAD) measures a broad spectrum of high-energy radiation incident at the surface, including secondary particles created via interactions of galactic cosmic rays and solar protons with Mars' atmospheric constituents. Curiosity's Rover Environmental Monitoring Station (REMS) carries six ultraviolet sensors, spanning 200-380 nm. For the first time, both the high-energy and ultraviolet radiation measured at the surface can be compared with measurements above the atmosphere, acquired by other platforms. Modern meteorology and the climatology of dust and water will be studied using the rover's cameras and REMS instrument package. The Mast Cameras are equipped with filters to allow optical measurements of dust and water ice aerosol opacity. Sky images and video clips will illuminate winds (via aerosols) and the dynamics of water ice and dust, including dust devils and dust storms. REMS can measure wind speed and direction in three dimensions, atmospheric pressure, air temperature, ground temperature, and humidity around the clock, independent of the rover's wake/sleep cycles. The meteorological measurements of REMS will be especially interesting given the setting at Gale Crater. Mesoscale modeling of the site indicates a strong influence of the regional topography. As the rover traverses toward Mount Sharp, it will sample different portions of a complex wind field forced by diurnal heating of the surface, ascending and descending catabatic flows from the crater wall and Mt. Sharp, and influences of local variations in albedo, thermal inertia, and topography. The combination of a broad meteorological package, a mobile rover, and a topographically diverse site will provide a wealth of raw data for understanding joint influences of the atmosphere and the surface. For example, orbital imagery indicates active dune migration at the margins of Mt. Sharp. REMS will illuminate the present-day surface stress of winds as a function of position, time, and season. Such correlations are key to understanding the geologic processes that have shaped Mount Sharp and Gale Crater. JF - American Geophysical Union Fall Meeting AU - Vasavada, A R AU - Grotzinger, J P AU - Crisp, J A AU - Gomez-Elvira, J AU - Mahaffy, P R AU - Webster, C R AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract U13A EP - 02 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549619959?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Overview+of+the+atmosphere+and+environment+within+Gale+Crater+on+Mars&rft.au=Vasavada%2C+A+R%3BGrotzinger%2C+J+P%3BCrisp%2C+J+A%3BGomez-Elvira%2C+J%3BMahaffy%2C+P+R%3BWebster%2C+C+R%3BAnonymous&rft.aulast=Rumpf&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/U/sessions/U13A/abstracts/U13A-02 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-31 N1 - CODEN - #07548 ER - TY - JOUR T1 - An observed negative trend in West Antarctic accumulation rates from 1975 to 2010; evidence from new observed and simulated records AN - 1545408848; 2014-054525 AB - Snow accumulation rate observations from five new firn cores show a statistically significant negative trend over the past several decades across the central West Antarctic ice sheet. A negative temporal trend in accumulation rates is unexpected in light of rising surface temperatures as well as model simulations predicting higher accumulation rates for the region. Both the magnitude of the mean accumulation rates and the range of interannual variability observed in the new records compares favorably to older records collected from a broad area of the West Antarctic ice sheet. The observed negative trend in accumulation is likely the result of a shift in low pressure systems over the Amundsen Sea region, dominated by changes in the austral fall season. Regional-scale climate models and reanalysis data do not capture the strong negative accumulation rate trend observed in these firn cores. Nevertheless the models and reanalyses agree well in both accumulation rate means and interannual variability, with no single model or dataset standing out as significantly more skilled at capturing the observed magnitude of and trend in accumulation rates in this region of the West Antarctic ice sheet. JF - American Geophysical Union Fall Meeting AU - Burgener, L K AU - Rupper, S AU - Koenig, L AU - Forster, R R AU - Christensen, W F AU - Williams, J AU - Koutnik, M R AU - Miege, C AU - Steig, E J AU - Riley, L AU - Keeler, D AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract PP33A EP - 2071 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1545408848?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Preliminary+development+of+digital+elevation+and+relief+models+for+ICESat-2+onboard+processing&rft.au=Leigh%2C+H+W%3BMagruder%2C+L+A%3BCarabajal%2C+C+C%3BAnonymous&rft.aulast=Leigh&rft.aufirst=H&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - http://abstractsearch.agu.org/meetings/2012/FM/sections/PP/sessions/PP33A/abstracts/PP33A-2071 LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-17 N1 - CODEN - #07548 ER - TY - JOUR T1 - Models for interpreting tungsten isotope anomalies in the Earth's crust AN - 1542644676; 2014-047622 AB - There have been several reports of positive tungsten isotope anomalies of about +15 ppm in rocks from Nuvvuagittuq (4.3 Ga), Isua (3.8 Ga) and Kostomuksha (2.8 Ga) that challenge models of differentiation and mantle mixing. Here, we employ constraints from experimental partitioning of W between metal and silicate, and from partial melting models, to evaluate the production and preservation of these W isotope anomalies in the Earth's earliest crust. We will also provide a revised interpretation of the Kostomuksha W isotope anomalies based on flow differentiation and metamorphism of komatiites. Two sets of models are produced. Model Set 1: Because D(metal-silicate) for W diminishes with increasing depth, the deep mantle has a higher W abundance, and a lower Hf/W ratio and consequently evolves a negative anomaly in W while the upper mantle evolves a complementary positive anomaly. Subsequent solid-state convection (4.55-2.8 Ga) mixes away the complementary W isotope anomalies to yield the modern mantle null value. This set of models predicts that the complementary negative anomalies in W should eventually be discovered in ancient magmatic rocks of deep mantle origin such as komatiites. Model Set 2: Tungsten is significantly more incompatible (like U, Th and Ba) than Hf, the latter being similar in compatibility to Sm. Our results show that extraction of low-degree partial melts (<2%) leaving a Hadean depleted mantle that can have Sm/Nd approximately 20% higher than chondrites also creates a f(Hf/W) approximately 2-3, sufficient to generate the anomalies observed in Archean rocks. These models increase Hf/W and Sm/Nd ratios in a correlated fashion explaining the tendency of positive W isotope anomalies to occur in rocks with positive Nd isotope anomalies. Recycling of the complementary Hadean crust would result in negative anomalies in later plume lavas, while partitioning of W into an enriched "hidden reservoir" would not. Nd isotope anomalies indicate a melting event around 35-75 Ma after solar system formation, the upper end of which is consistent with our models of Hf/W fractionation, that also yield a depleted mantle composition consistent with DMM. Production of the anomalies is accompanied by the need to preserve the anomalies. We argue that the most effective means of preserving the W isotope anomalies is by crustal storage, and we hypothesize that W is efficiently recycled back to juvenile crust during subduction zone processing. Eventually, the addition of juvenile W from the mantle will dilute the positive W isotope anomalies stored in the early crust. The amount of juvenile W required to be added is about a factor of 4 or more, and it is likely that this occurred during the late Archean crustal growth phase (2.5 Ga), so that positive W isotope anomalies are not likely to occur in much younger rocks. A secular decline in crustal W isotope anomalies is predicted. JF - American Geophysical Union Fall Meeting AU - Humayun, M AU - Brandon, A D AU - Righter, Kevin AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract V53G EP - 05 PB - American Geophysical Union, Washington, DC VL - 2012 KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1542644676?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Models+for+interpreting+tungsten+isotope+anomalies+in+the+Earth%27s+crust&rft.au=Humayun%2C+M%3BBrandon%2C+A+D%3BRighter%2C+Kevin%3BAnonymous&rft.aulast=Humayun&rft.aufirst=M&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-07-04 N1 - CODEN - #07548 ER - TY - JOUR T1 - Source characterization and trend analysis of the Sahelian dust AN - 1529791111; 2014-035817 AB - Dust has significant impacts on human health and the economy, specifically over the Sahel, which is the semi-arid region located south of the Sahara desert. Also, the region is highly vulnerable to future climate changes and especially to a drier and windier climate. Estimating the impact of the Sahelian dust on the local and extended area is complicated because the Sahel itself is an active dust source region and it is located downwind of the Sahara, including the Bodele depression. A previous study estimated that emissions driven by strong surface winds occurring across the Sahel significantly contribute to the total dust load over West and North Africa. Another previous study using the ERA-Interim-Reanalysis data concluded that dust emission from the Sahara and subsequent transport of the dust to the Sahel driven by the synoptic patterns is mainly responsible for the formation of the Sahel dust zone. Dust generation in the Sahel is also related to precipitation and human activity. The long-term trend of the Sahelian desert and dust varies depending on analysis methods and periods, and the analyses show either an increasing trend, little change, or a decreasing trend. There is a large gap in models handling the Sahelian dust. A recent review on global dust sources and emission rates indicated that most models do not include emissions from the Sahel. We will present the result of a modeling study on the Sahelian dust using the NASA GOCART model. The dust parameterization has been recently updated with the dynamic source function that utilizes the satellite observed Normalized Difference Vegetation Index. The meteorological fields are taken from the latest version of the NASA GEOS5 system. These recent improvements enable the model to perform more realistic simulations of the Sahelian dust, which has a strong seasonal variation. Specifically our focus in this study is two folds. First, we will attribute the source of dust between the locally emitted dust and the transported dust. Secondly, we will present long-term dust trends in the region produced by the model experiments and compare these model results with observations. JF - American Geophysical Union Fall Meeting AU - Kim, D AU - Chin, M AU - Diehl, T L AU - Anonymous Y1 - 2012/12// PY - 2012 DA - December 2012 SP - Abstract A41L EP - 01 PB - American Geophysical Union, Washington, DC VL - 2012 KW - provenance KW - clastic sediments KW - dust KW - sediments KW - Africa KW - Sahel KW - 06A:Sedimentary petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1529791111?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Source+characterization+and+trend+analysis+of+the+Sahelian+dust&rft.au=Kim%2C+D%3BChin%2C+M%3BDiehl%2C+T+L%3BAnonymous&rft.aulast=Kim&rft.aufirst=D&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - American Geophysical Union 2012 fall meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by, and/or abstract, Copyright, American Geophysical Union, Washington, DC, United States N1 - Date revised - 2014-01-01 N1 - PubXState - DC N1 - Last updated - 2014-05-29 N1 - CODEN - #07548 N1 - SubjectsTermNotLitGenreText - Africa; clastic sediments; dust; provenance; Sahel; sediments ER - TY - RPRT T1 - CONSTELLATION PROGRAM, BREVARD AND VOLUSIA COUNTIES, FLORIDA; HANNCOCK COUNTY, MISSISSIPPI; ORLEANS PARISH, LOUISIANA; HARRIS COUNTY, TEXAS; MADISON COUNTY, ALABAMA; CUYAHOGA AND ERIE COUNTIES, OHIO; HAMPTON, VIRGINIA; SANTA CLARA COUNTY, CALIFORNIA; DONA ANA AND OTERO COUNTIES, NEW MEXICO; AND BOX ELDER AND DAVIS COUNTIES, UTAH (ADOPTION OF THE NASA FINAL PROGRAMMATIC EIS OF JANUARY 2008). AN - 1323793786; 15567 AB - PURPOSE: Conceptual schemes and schematic alternative approaches for the Constellation Program, which aims to allow humans to travel to the Moon, Mars, and beyond, are proposed. In 2004, President George W. Bush announced the Vision For Space Exploration Initiative to return humans to the Moon by 2020 in preparation for the exploration of Mars and points beyond. As a first step toward developing vehicles to achieve the goals of this initiative, the President directed the National Aeronautics and Space Administration (NASA) to develop and fly a new Crew Exploration Vehicle (CEV, since named Orion) by 2014. The associated program would complete the assessment of requirements and plans to enable CEVs to provide crew transport to the International Space Station and to accelerate the development of the CEV design and crew launch systems. Goals would include: the definition of top-level requirements and configurations for crew and cargo launch systems to support the lunar and Martian exploration programs; development of a reference lunar exploration architecture concept to support sustained human robotic lunar exploration operations; identification of key technologies required to enable and enhance these reference exploration systems; and prioritization of near- and long-term technology requirements. Constellation Program components would be implemented at the Johnson Space Center, Marshall Space Flight Center, Michoud Assembly Facility, and Kennedy Space Center and in as yet undetermined research and development facilities. Areas potentially affected by program activities include Brevard and Volusia counties, Florida; Hanncock County, Mississippi; Orleans Parish, Louisiana; Harris County, Texas; Madison County, Alabama; Cuyahoga and Erie counties, Ohio; Hampton, Virginia; Santa Clara County, California; Dona Ana and Otero counties, New Mexico; and Box Elder and Davis counties, Utah. The Federal Aviation Administration has adopted the final programmatic EIS issued by NASA in January 2008. POSITIVE IMPACTS: The proposed program would develop technology for human and robotic exploration of the Solar System and beyond, and promote international and commercial participation in space exploration. NEGATIVE IMPACTS: Potential building modifications and/or new construction at research and development facilities would result in impacts typical of such projects, largely loss of permeable soil and vegetation. Construction activities would be expected at Michoud Assembly Facility, Kennedy Space Center, and Ames Research Center. New hazardous materials processing facilities would be placed at Kennedy Space Center. Orion thermal protection system flight tests would result in the usual impacts of launching spacecraft. Continued use of substances such as HCFC-141b for thermal protection systems would result in the release of these ozone layer-depleting substances into the atmosphere. LEGAL MANDATES: NASA Authorization Act of 2005. PRIOR REFERENCES: For the abstract of the NASA final programmatic EIS, see 08-0065F, Volume 32, Number 1. JF - EPA number: 120372, 498 pages, November 30, 2012 PY - 2012 KW - Research and Development KW - Aerospace KW - Air Quality KW - Buildings KW - International Programs KW - Research KW - Research Facilities KW - Spacecraft KW - Space Shuttles KW - Alabama KW - California KW - Florida KW - Louisiana KW - Mars KW - Mississippi KW - Moon KW - New Mexico KW - Ohio KW - Texas KW - Utah KW - Virginia KW - NASA Authorization Act of 2005, Project Authorization UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1323793786?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/Environmental+Impact+Statements%3A+Digests&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=report&rft.jtitle=&rft.atitle=&rft.au=&rft.aulast=&rft.aufirst=L&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Name - Department of Transportation, Federal Aviation Administration, Washington, District of Columbia; DOT N1 - Date revised - 2013-04-01 N1 - SuppNotes - Final. Preparation date: November 30, 2012 N1 - Last updated - 2013-04-05 ER - TY - JOUR T1 - A reconciled estimate of ice-sheet mass balance AN - 1282821716; 2013-014321 AB - We combined an ensemble of satellite altimetry, interferometry, and gravimetry data sets using common geographical regions, time intervals, and models of surface mass balance and glacial isostatic adjustment to estimate the mass balance of Earth's polar ice sheets. We find that there is good agreement between different satellite methods--especially in Greenland and West Antarctica--and that combining satellite data sets leads to greater certainty. Between 1992 and 2011, the ice sheets of Greenland, East Antarctica, West Antarctica, and the Antarctic Peninsula changed in mass by -152 + or - 49, +14 + or - 43, -65 + or - 26, and -20 + or - 14 gigatonnes year (super -1) , respectively. Since 1992, the polar ice sheets have contributed, on average, 0.59 + or - 0.20 millimeter year (super -1) to the rate of global sea-level rise. JF - Science AU - Shepherd, Andrew AU - Ivins, Erik R AU - A, Geruo AU - Barletta, Valentina R AU - Bentley, Mike J AU - Bettadpur, Srinivas AU - Briggs, Kate H AU - Bromwich, David H AU - Forsberg, Rene AU - Galin, Natalia AU - Horwath, Martin AU - Jacobs, Stan AU - Joughin, Ian AU - King, Matt A AU - Lenaerts, Jan T M AU - Li, Jilu AU - Ligtenberg, Stefan R M AU - Luckman, Adrian AU - Luthcke, Scott B AU - McMillan, Malcolm AU - Meister, Rakia AU - Milne, Glenn AU - Mouginot, Jeremie AU - Muir, Alan AU - Nicolas, Julien P AU - Paden, John AU - Payne, Antony J AU - Pritchard, Hamish AU - Rignot, Eric AU - Rott, Helmut AU - Sorensen, Louise Sandberg AU - Scambos, Ted A AU - Scheuchl, Bernd AU - Schrama, Ernst J O AU - Smith, Ben AU - Sundal, Aud V AU - van Angelen, Jan H AU - van de Berg, Willem J AU - van den Broeke, Michiel R AU - Vaughan, David G AU - Velicogna, Isabella AU - Wahr, John AU - Whitehouse, Pippa L AU - Wingham, Duncan J AU - Yi, Donghui AU - Young, Duncan AU - Zwally, H Jay Y1 - 2012/11/30/ PY - 2012 DA - 2012 Nov 30 SP - 1183 EP - 1189 PB - American Association for the Advancement of Science, Washington, DC VL - 338 IS - 6111 SN - 0036-8075, 0036-8075 KW - polar regions KW - ICESat KW - Arctic region KW - Greenland ice sheet KW - geophysical methods KW - GRACE KW - altimetry KW - satellite methods KW - interferometry KW - ice sheets KW - isostasy KW - Antarctic ice sheet KW - Greenland KW - gravity methods KW - fluctuations KW - Antarctica KW - mass balance KW - glacial geology KW - remote sensing KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282821716?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=A+reconciled+estimate+of+ice-sheet+mass+balance&rft.au=Shepherd%2C+Andrew%3BIvins%2C+Erik+R%3BA%2C+Geruo%3BBarletta%2C+Valentina+R%3BBentley%2C+Mike+J%3BBettadpur%2C+Srinivas%3BBriggs%2C+Kate+H%3BBromwich%2C+David+H%3BForsberg%2C+Rene%3BGalin%2C+Natalia%3BHorwath%2C+Martin%3BJacobs%2C+Stan%3BJoughin%2C+Ian%3BKing%2C+Matt+A%3BLenaerts%2C+Jan+T+M%3BLi%2C+Jilu%3BLigtenberg%2C+Stefan+R+M%3BLuckman%2C+Adrian%3BLuthcke%2C+Scott+B%3BMcMillan%2C+Malcolm%3BMeister%2C+Rakia%3BMilne%2C+Glenn%3BMouginot%2C+Jeremie%3BMuir%2C+Alan%3BNicolas%2C+Julien+P%3BPaden%2C+John%3BPayne%2C+Antony+J%3BPritchard%2C+Hamish%3BRignot%2C+Eric%3BRott%2C+Helmut%3BSorensen%2C+Louise+Sandberg%3BScambos%2C+Ted+A%3BScheuchl%2C+Bernd%3BSchrama%2C+Ernst+J+O%3BSmith%2C+Ben%3BSundal%2C+Aud+V%3Bvan+Angelen%2C+Jan+H%3Bvan+de+Berg%2C+Willem+J%3Bvan+den+Broeke%2C+Michiel+R%3BVaughan%2C+David+G%3BVelicogna%2C+Isabella%3BWahr%2C+John%3BWhitehouse%2C+Pippa+L%3BWingham%2C+Duncan+J%3BYi%2C+Donghui%3BYoung%2C+Duncan%3BZwally%2C+H+Jay&rft.aulast=Shepherd&rft.aufirst=Andrew&rft.date=2012-11-30&rft.volume=338&rft.issue=6111&rft.spage=1183&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/ L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 94 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table, sketch maps N1 - SuppNotes - Related article by Kerr, R. A., on p. 1138 N1 - Last updated - 2013-02-05 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - altimetry; Antarctic ice sheet; Antarctica; Arctic region; fluctuations; geophysical methods; glacial geology; GRACE; gravity methods; Greenland; Greenland ice sheet; ice sheets; ICESat; interferometry; isostasy; mass balance; polar regions; remote sensing; satellite methods DO - http://dx.doi.org/10.1126/science.1228102 ER - TY - JOUR T1 - Making sense of palaeoclimate sensitivity AN - 1328503950; 2013-033556 JF - Nature (London) AU - Rohling, E J AU - Sluijs, A AU - Dijkstra, H A AU - Koehler, P AU - van de Wal, R S W AU - von der Heydt, A S AU - Beerling, D J AU - Berger, A AU - Bijl, P K AU - Crucifix, M AU - DeConto, R AU - Drijfhout, S S AU - Fedorov, A AU - Foster, G L AU - Ganopolski, A AU - Hansen, J AU - Honisch, B AU - Hooghiemstra, H AU - Huber, M AU - Huybers, P AU - Knutti, R AU - Lea, D W AU - Lourens, L J AU - Lunt, D AU - Masson-Demotte, V AU - Medina-Elizalde, M AU - Otto-Bliesner, B AU - Pagani, M AU - Palike, H AU - Renssen, H AU - Royer, D L AU - Siddall, M AU - Valdes, P AU - Zachos, J C AU - Zeebe, R E Y1 - 2012/11/29/ PY - 2012 DA - 2012 Nov 29 SP - 683 EP - 691 PB - Macmillan Journals, London VL - 491 IS - 7426 SN - 0028-0836, 0028-0836 KW - ice cores KW - last glacial maximum KW - Quaternary KW - numerical models KW - paleoatmosphere KW - prediction KW - mathematical models KW - global change KW - Paleogene KW - Paleocene-Eocene Thermal Maximum KW - paleoclimatology KW - climate change KW - carbon dioxide KW - Cenozoic KW - Tertiary KW - sensitivity analysis KW - reconstruction KW - greenhouse gases KW - climate forcing KW - global warming KW - 12:Stratigraphy UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1328503950?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+%28London%29&rft.atitle=Making+sense+of+palaeoclimate+sensitivity&rft.au=Rohling%2C+E+J%3BSluijs%2C+A%3BDijkstra%2C+H+A%3BKoehler%2C+P%3Bvan+de+Wal%2C+R+S+W%3Bvon+der+Heydt%2C+A+S%3BBeerling%2C+D+J%3BBerger%2C+A%3BBijl%2C+P+K%3BCrucifix%2C+M%3BDeConto%2C+R%3BDrijfhout%2C+S+S%3BFedorov%2C+A%3BFoster%2C+G+L%3BGanopolski%2C+A%3BHansen%2C+J%3BHonisch%2C+B%3BHooghiemstra%2C+H%3BHuber%2C+M%3BHuybers%2C+P%3BKnutti%2C+R%3BLea%2C+D+W%3BLourens%2C+L+J%3BLunt%2C+D%3BMasson-Demotte%2C+V%3BMedina-Elizalde%2C+M%3BOtto-Bliesner%2C+B%3BPagani%2C+M%3BPalike%2C+H%3BRenssen%2C+H%3BRoyer%2C+D+L%3BSiddall%2C+M%3BValdes%2C+P%3BZachos%2C+J+C%3BZeebe%2C+R+E&rft.aulast=Rohling&rft.aufirst=E&rft.date=2012-11-29&rft.volume=491&rft.issue=7426&rft.spage=683&rft.isbn=&rft.btitle=&rft.title=Nature+%28London%29&rft.issn=00280836&rft_id=info:doi/10.1038%2Fnature11574 L2 - http://www.nature.com/nature/index.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 99 N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2013-04-19 N1 - CODEN - NATUAS N1 - SubjectsTermNotLitGenreText - carbon dioxide; Cenozoic; climate change; climate forcing; global change; global warming; greenhouse gases; ice cores; last glacial maximum; mathematical models; numerical models; paleoatmosphere; Paleocene-Eocene Thermal Maximum; paleoclimatology; Paleogene; prediction; Quaternary; reconstruction; sensitivity analysis; Tertiary DO - http://dx.doi.org/10.1038/nature11574 ER - TY - JOUR T1 - Infiltration of Martian outflow channel floodwaters into lowland cavernous systems AN - 1429840395; 2013-070392 AB - The hydrosphere of Mars has remained mostly concealed within the subsurface for the past approximately 3.5 Gyr. Localized rupturing of the permafrost-capped crust led to voluminous groundwater discharges that carved some of the largest known channels in the solar system. However, our knowledge of the nature of the flows and their ultimate fate remains incomplete, partly because diagnostic landforms at outflow channel termini have been largely destroyed or buried. The Hebrus Valles outflow channels were excavated by fluid discharges that emanated from two point sources, and they mostly terminate in systems of fractures and depressions within the northern plains. Our investigation indicates that outflow channel floodwaters were captured and reabsorbed into the subsurface in zones where caverns developed within the northern plains. These findings imply that the study region comprises the only known location in the Martian northern lowlands where the fate of outflow channel discharges can be assessed with confidence. We propose that evacuation of subsurface materials via mud volcanism was an important process in cavern formation. Our conceptual model provides a hypothesis to account for the fate of sediments and fluids from some of the Martian outflow channels. It also reveals a mechanism for lowland cavern formation and upper crustal volatile enrichment after the development of the Martian global cryosphere. Abstract Copyright (2012), American Geophysical Union. All Rights Reserved. JF - Geophysical Research Letters AU - Rodriguez, J A P AU - Bourke, Mary AU - Tanaka, Kenneth L AU - Miyamoto, Hideaki AU - Kargel, Jeffrey AU - Baker, Victor AU - Fairen, Alberto G AU - Davies, Richard J AU - Bridget, Lynne AU - Santiago, Rogelio Linares AU - Hernandez, Mario Zarroca AU - Berman, Daniel C Y1 - 2012/11/28/ PY - 2012 DA - 2012 Nov 28 EP - L22201 PB - American Geophysical Union, Washington, DC VL - 39 IS - 22 SN - 0094-8276, 0094-8276 KW - terrestrial planets KW - hydrology KW - planets KW - lowlands KW - surface features KW - floods KW - channels KW - Mars KW - outflow channels KW - discharge KW - hydrosphere KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429840395?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=Infiltration+of+Martian+outflow+channel+floodwaters+into+lowland+cavernous+systems&rft.au=Rodriguez%2C+J+A+P%3BBourke%2C+Mary%3BTanaka%2C+Kenneth+L%3BMiyamoto%2C+Hideaki%3BKargel%2C+Jeffrey%3BBaker%2C+Victor%3BFairen%2C+Alberto+G%3BDavies%2C+Richard+J%3BBridget%2C+Lynne%3BSantiago%2C+Rogelio+Linares%3BHernandez%2C+Mario+Zarroca%3BBerman%2C+Daniel+C&rft.aulast=Rodriguez&rft.aufirst=J+A&rft.date=2012-11-28&rft.volume=39&rft.issue=22&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2012GL053225 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 22 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2013-09-05 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - channels; discharge; floods; hydrology; hydrosphere; lowlands; Mars; outflow channels; planets; surface features; terrestrial planets DO - http://dx.doi.org/10.1029/2012GL053225 ER - TY - NEWS T1 - Total Eclipse of the Sun AN - 1220477948 JF - UPI Space Daily AU - Dr. Tony Phillips for NASA Science News Y1 - 2012/11/28/ PY - 2012 DA - 2012 Nov 28 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220477948?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Total+Eclipse+of+the+Sun&rft.au=Dr.+Tony+Phillips+for+NASA+Science+News&rft.aulast=Dr.+Tony+Phillips+for+NASA+Science+News&rft.aufirst=&rft.date=2012-11-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-11-28 ER - TY - JOUR T1 - Proceedings of the National Academy of Sciences of the United States of America AN - 1629938331; 2014-096359 JF - Proceedings of the National Academy of Sciences of the United States of America AU - Elsila, Jamie E AU - Glavin, Daniel P AU - Dworkin, Jason P AU - Martins, Zita AU - Bada, Jeffrey L Y1 - 2012/11/27/ PY - 2012 DA - 2012 Nov 27 SP - 1 PB - National Academy of Sciences, Washington, DC VL - 109 IS - 48 SN - 0027-8424, 0027-8424 KW - QUE 99177 KW - isomerization KW - stony meteorites KW - biochemistry KW - epimerization KW - Elephant Moraine Meteorites KW - carbonaceous chondrites KW - solubility KW - measurement KW - meteorites KW - alloisoleucine KW - organic compounds KW - organic acids KW - CR chondrites KW - Antarctica KW - racemization KW - amino acids KW - Queen Alexandra Range Meteorites KW - EET 92042 KW - enantiomers KW - chondrites KW - isoleucine KW - 05B:Petrology of meteorites and tektites KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629938331?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.atitle=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.au=Elsila%2C+Jamie+E%3BGlavin%2C+Daniel+P%3BDworkin%2C+Jason+P%3BMartins%2C+Zita%3BBada%2C+Jeffrey+L&rft.aulast=Elsila&rft.aufirst=Jamie&rft.date=2012-11-27&rft.volume=109&rft.issue=48&rft.spage=E3288&rft.isbn=&rft.btitle=&rft.title=Proceedings+of+the+National+Academy+of+Sciences+of+the+United+States+of+America&rft.issn=00278424&rft_id=info:doi/10.1073%2Fpnas.1213261109 L2 - http://www.pnas.org/content/by/year LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 5 N1 - PubXState - DC N1 - SuppNotes - For reference to original see Pizzarello, S., et. al., Proceedings of the National Academy of Sciences of the United States of America, Vol. 109, No. 30, p. 11949-11954, DOI: 10.1073/pnas.1204865109, 2012 N1 - Last updated - 2014-12-04 N1 - CODEN - PNASA6 N1 - SubjectsTermNotLitGenreText - alloisoleucine; amino acids; Antarctica; biochemistry; carbonaceous chondrites; chondrites; CR chondrites; EET 92042; Elephant Moraine Meteorites; enantiomers; epimerization; isoleucine; isomerization; measurement; meteorites; organic acids; organic compounds; QUE 99177; Queen Alexandra Range Meteorites; racemization; solubility; stony meteorites DO - http://dx.doi.org/10.1073/pnas.1213261109 ER - TY - JOUR T1 - Fluvial features on Titan; insights from morphology and modeling AN - 1244690286; 2013-007415 AB - Fluvial features on Titan have been identified in synthetic aperture radar (SAR) data taken during spacecraft flybys by the Cassini Titan Radar Mapper (RADAR) and in Descent Imager/Spectral Radiometer (DISR) images taken during descent of the Huygens probe to the surface. Interpretations using terrestrial analogs and process mechanics extend our perspective on fluvial geomorphology to another world and offer insight into their formative processes. At the landscape scale, the varied morphologies of Titan's fluvial networks imply a variety of mechanical controls, including structural influence, on channelized flows. At the reach scale, the various morphologies of individual fluvial features, implying a broad range of fluvial processes, suggest that (paleo-)flows did not occupy the entire observed width of the features. DISR images provide a spatially limited view of uplands dissected by valley networks, also likely formed by overland flows, which are not visible in lower-resolution SAR data. This high-resolution snapshot suggests that some fluvial features observed in SAR data may be river valleys rather than channels, and that uplands elsewhere on Titan may also have fine-scale fluvial dissection that is not resolved in SAR data. Radar-bright terrain with crenulated bright and dark bands is hypothesized here to be a signature of fine-scale fluvial dissection. Fluvial deposition is inferred to occur in braided channels, in (paleo)lake basins, and on SAR-dark plains, and DISR images at the surface indicate the presence of fluvial sediment. Flow sufficient to move sediment is inferred from observations and modeling of atmospheric processes, which support the inference from surface morphology of precipitation-fed fluvial processes. With material properties appropriate for Titan, terrestrial hydraulic equations are applicable to flow on Titan for fully turbulent flow and rough boundaries. For low-Reynolds-number flow over smooth boundaries, however, knowledge of fluid kinematic viscosity is necessary. Sediment movement and bed form development should occur at lower bed shear stress on Titan than on Earth. Scaling bedrock erosion, however, is hampered by uncertainties regarding Titan material properties. Overall, observations of Titan point to a world pervasively influenced by fluvial processes, for which appropriate terrestrial analogs and formulations may provide insight. JF - Geological Society of America Bulletin AU - Burr, Devon M AU - Perron, J Taylor AU - Lamb, Michael P AU - Irwin, Rossman P, III AU - Collins, Geoffrey C AU - Howard, Alan D AU - Sklar, Leonard S AU - Moore, Jeffrey M AU - Adamkovics, Mate AU - Baker, Victor R AU - Drummond, Sarah A AU - Black, Benjamin A Y1 - 2012/11/21/ PY - 2012 DA - 2012 Nov 21 SP - 299 EP - 321 PB - Geological Society of America (GSA), Boulder, CO VL - 125 IS - 3-4 SN - 0016-7606, 0016-7606 KW - lacustrine features KW - icy satellites KW - valleys KW - sediment transport KW - erosion KW - rainfall KW - drainage patterns KW - suspension KW - radar methods KW - channels KW - landforms KW - atmospheric precipitation KW - satellite methods KW - topography KW - transport KW - SAR KW - fluvial features KW - Titan Satellite KW - terrestrial comparison KW - depositional environment KW - satellites KW - remote sensing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244690286?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geological+Society+of+America+Bulletin&rft.atitle=Fluvial+features+on+Titan%3B+insights+from+morphology+and+modeling&rft.au=Burr%2C+Devon+M%3BPerron%2C+J+Taylor%3BLamb%2C+Michael+P%3BIrwin%2C+Rossman+P%2C+III%3BCollins%2C+Geoffrey+C%3BHoward%2C+Alan+D%3BSklar%2C+Leonard+S%3BMoore%2C+Jeffrey+M%3BAdamkovics%2C+Mate%3BBaker%2C+Victor+R%3BDrummond%2C+Sarah+A%3BBlack%2C+Benjamin+A&rft.aulast=Burr&rft.aufirst=Devon&rft.date=2012-11-21&rft.volume=125&rft.issue=3-4&rft.spage=299&rft.isbn=&rft.btitle=&rft.title=Geological+Society+of+America+Bulletin&rft.issn=00167606&rft_id=info:doi/10.1130%2FB30612.1 L2 - http://www.gsajournals.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 203 N1 - PubXState - CO N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-03-14 N1 - CODEN - BUGMAF N1 - SubjectsTermNotLitGenreText - atmospheric precipitation; channels; depositional environment; drainage patterns; erosion; fluvial features; icy satellites; lacustrine features; landforms; radar methods; rainfall; remote sensing; SAR; satellite methods; satellites; sediment transport; suspension; terrestrial comparison; Titan Satellite; topography; transport; valleys DO - http://dx.doi.org/10.1130/B30612.1 ER - TY - JOUR T1 - Plate margin deformation and active tectonics along the northern edge of the Yakutat Terrane in the Saint Elias Orogen, Alaska, and Yukon, Canada AN - 1270041357; 2013-006121 AB - Structural syntaxes, tectonic aneurysms, and fault-bounded fore-arc slivers are important tectonic elements of orogenic belts worldwide. In this study we used high-resolution topography, geodetic imaging, seismic, and geologic data to advance understanding of how these features evolved during accretion of the Yakutat Terrane to North America. Because glaciers extend over much of the orogen, the topography and dynamics of the glaciers were analyzed to infer the location and nature of faults and shear zones that lie buried beneath the ice. The Fairweather transform fault system terminates by oblique-extensional splay faulting within a structural syntaxis, where thrust faulting and contractional strain drive rapid tectonic uplift and rock exhumation beneath the upper Seward Glacier. West of the syntaxis, oblique plate convergence created a dextral shear zone beneath the Bagley Ice Valley that may have been reactivated by reverse faulting when the subduction megathrust stepped eastward during the last 5-6 Ma. The Bagley fault zone dips steeply through the upper plate to intersect the subduction megathrust at depth, forming a fault-bounded crustal sliver capable of partitioning oblique convergence into strike-slip and thrust motion. Since ca. 20 Ma the Bagley fault accommodated more than 50 km of dextral shearing and several kilometers of reverse motion along its southern flank during terrane accretion. The fault is considered capable of generating earthquakes because it is suitably oriented for reactivation in the contemporary stress field, links to faults that generated large historic earthquakes, and is locally marked by seismicity. JF - Geosphere AU - Bruhn, Ronald L AU - Sauber, Jeanne AU - Cotton, Michelle M AU - Pavlis, Terry L AU - Burgess, Evan AU - Ruppert, Natalia AU - Forster, Richard R Y1 - 2012/11/16/ PY - 2012 DA - 2012 Nov 16 PB - Geological Society of America, Boulder, CO VL - Pre-Issue Publication KW - United States KW - strain KW - uplifts KW - topography KW - seismicity KW - syntaxis KW - tectonics KW - Fairweather Fault KW - faults KW - North America KW - Yakutat Terrane KW - tectonic elements KW - rates KW - orogenic belts KW - deformation KW - Yukon Territory KW - plate convergence KW - plate tectonics KW - Bagley Fault KW - Canada KW - Western Canada KW - Saint Elias Mountains KW - epicenters KW - Alaska KW - earthquakes KW - 19:Seismology KW - 18:Solid-earth geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1270041357?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geosphere&rft.atitle=Plate+margin+deformation+and+active+tectonics+along+the+northern+edge+of+the+Yakutat+Terrane+in+the+Saint+Elias+Orogen%2C+Alaska%2C+and+Yukon%2C+Canada&rft.au=Bruhn%2C+Ronald+L%3BSauber%2C+Jeanne%3BCotton%2C+Michelle+M%3BPavlis%2C+Terry+L%3BBurgess%2C+Evan%3BRuppert%2C+Natalia%3BForster%2C+Richard+R&rft.aulast=Bruhn&rft.aufirst=Ronald&rft.date=2012-11-16&rft.volume=Pre-Issue+Publication&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geosphere&rft.issn=1553-040X&rft_id=info:doi/10.1130%2FGES00807.1 L2 - http://www.gsajournals.org/perlserv/?request=get-archive&issn=1553-040X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 107 N1 - PubXState - CO N1 - Document feature - illus. incl. 2 tables, geol. sketch maps N1 - Last updated - 2014-01-02 N1 - SubjectsTermNotLitGenreText - Alaska; Bagley Fault; Canada; deformation; earthquakes; epicenters; Fairweather Fault; faults; North America; orogenic belts; plate convergence; plate tectonics; rates; Saint Elias Mountains; seismicity; strain; syntaxis; tectonic elements; tectonics; topography; United States; uplifts; Western Canada; Yakutat Terrane; Yukon Territory DO - http://dx.doi.org/10.1130/GES00807.1 ER - TY - NEWS T1 - Dust's Warming Counters Half of its Cooling Effect AN - 1151507411 JF - UPI Space Daily AU - Kathryn Hansen for NASA Earth Science News Y1 - 2012/11/13/ PY - 2012 DA - 2012 Nov 13 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151507411?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Dust%27s+Warming+Counters+Half+of+its+Cooling+Effect&rft.au=Kathryn+Hansen+for+NASA+Earth+Science+News&rft.aulast=Kathryn+Hansen+for+NASA+Earth+Science+News&rft.aufirst=&rft.date=2012-11-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-11-13 ER - TY - JOUR T1 - A Tropospheric Emission Spectrometer HDO/H sub(2)O retrieval simulator for climate models AN - 1257752676; 17425123 AB - Retrievals of the isotopic composition of water vapor from the Aura Tropospheric Emission Spectrometer (TES) have unique value in constraining moist processes in climate models. Accurate comparison between simulated and retrieved values requires that model profiles that would be poorly retrieved are excluded, and that an instrument operator be applied to the remaining profiles. Typically, this is done by sampling model output at satellite measurement points and using the quality flags and averaging kernels from individual retrievals at specific places and times. This approach is not reliable when the model meteorological conditions influencing retrieval sensitivity are different from those observed by the instrument at short time scales, which will be the case for free-running climate simulations. In this study, we describe an alternative, "categorical" approach to applying the instrument operator, implemented within the NASA GISS ModelE general circulation model. Retrieval quality and averaging kernel structure are predicted empirically from model conditions, rather than obtained from collocated satellite observations. This approach can be used for arbitrary model configurations, and requires no agreement between satellite-retrieved and model meteorology at short time scales. To test this approach, nudged simulations were conducted using both the retrieval-based and categorical operators. Cloud cover, surface temperature and free-tropospheric moisture content were the most important predictors of retrieval quality and averaging kernel structure. There was good agreement between the delta D fields after applying the retrieval-based and more detailed categorical operators, with increases of up to 30ppt over the ocean and decreases of up to 40ppt over land relative to the raw model fields. The categorical operator performed better over the ocean than over land, and requires further refinement for use outside of the tropics. After applying the TES operator, ModelE had delta D biases of -8ppt over ocean and -34ppt over land compared to TES delta D, which were less than the biases using raw model delta D fields. JF - Atmospheric Chemistry and Physics AU - Field, R D AU - Risi, C AU - Schmidt, G A AU - Worden, J AU - Voulgarakis, A AU - LeGrande, AN AU - Sobel, AH AU - Healy, R J AD - NASA Goddard Institute for Space Studies, New York, NY, USA Y1 - 2012/11/12/ PY - 2012 DA - 2012 Nov 12 SP - 10485 EP - 10504 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 21 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Surface temperatures KW - Simulators KW - Isotopic composition of water vapor KW - Ocean-atmosphere system KW - Sampling KW - Spectrometers KW - Marine KW - Climate models KW - Chemical composition KW - Climates KW - Climate KW - Cloud Cover KW - Simulation KW - Troposphere KW - Atmospheric circulation KW - Cloud cover KW - Satellite instrumentation KW - Water content KW - Model Studies KW - Satellite data KW - Numerical simulations KW - Profiles KW - Oceans KW - General circulation models KW - Atmospheric chemistry KW - Moisture Content KW - SW 5010:Network design KW - AQ 00006:Sewage KW - M2 551.581:Latitudinal Influences (551.581) KW - Q2 09146:TSD distribution, water masses and circulation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1257752676?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=A+Tropospheric+Emission+Spectrometer+HDO%2FH+sub%282%29O+retrieval+simulator+for+climate+models&rft.au=Field%2C+R+D%3BRisi%2C+C%3BSchmidt%2C+G+A%3BWorden%2C+J%3BVoulgarakis%2C+A%3BLeGrande%2C+AN%3BSobel%2C+AH%3BHealy%2C+R+J&rft.aulast=Field&rft.aufirst=R&rft.date=2012-11-12&rft.volume=12&rft.issue=21&rft.spage=10485&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/10.5194%2Facp-12-10485-2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-12-01 N1 - Last updated - 2016-04-29 N1 - SubjectsTermNotLitGenreText - Chemical composition; Simulators; Atmospheric chemistry; Climate; Ocean-atmosphere system; Troposphere; Simulation; Atmospheric circulation; Water content; Surface temperatures; Satellite data; Climate models; Numerical simulations; Isotopic composition of water vapor; General circulation models; Cloud cover; Satellite instrumentation; Profiles; Oceans; Climates; Cloud Cover; Moisture Content; Sampling; Spectrometers; Model Studies; Marine DO - http://dx.doi.org/10.5194/acp-12-10485-2012 ER - TY - JOUR T1 - On the universality of turbulent axisymmetric wakes AN - 1356933866; 18059132 AB - Direct numerical simulations (DNS) of two time-dependent, axially homogeneous, axisymmetric turbulent wakes having very different initial conditions are presented in order to assess whether they reach a universal self-similar state as classically hypothesized by Townsend. It is shown that an extensive early-time period exists during which the two wakes are individually self-similar with wake widths growing like delta proportional to t super(1/3), as predicted by classical dimensional analysis, but have very different growth rates and are thus not universal. Subsequently, however, the turbulence adjusts to yield, eventually, wakes that are structurally identical and have the same growth rate (also with delta proportional to t super(1/3)) so provide clear evidence of a universal, self-similar state. The former non-universal but self-similar state extends, in terms of a spatially equivalent flow behind a spherical body of diameter d, to a distance of O(3000d) whereas the final universal state does not appear before O(5000d) (and exists despite relatively low values of the Reynolds number and no evidence of a spectral Kappa super(-5/3) inertial subrange). Universal wake evolution is therefore likely to be rare in practice. Despite its low Reynolds number, the flow does not exhibit the sometime-suggested alternative self-similar behaviour with delta proportional to t super(1/2) (as for the genuinely laminar case) at large times (or, equivalently, distances), since the eddy viscosity remains large compared to the molecular viscosity and its temporal variations are not negligible. JF - Journal of Fluid Mechanics AU - Redford, John A AU - Castro, Ian P AU - Coleman, Gary N AD - Aerodynamics and Flight Mechanics Research Group, University of Southampton, Highfield, Southampton SO17 1BJ, UK, Gary.N.Coleman@nasa.gov Y1 - 2012/11/10/ PY - 2012 DA - 2012 Nov 10 SP - 419 EP - 452 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU United Kingdom VL - 710 SN - 0022-1120, 0022-1120 KW - Meteorological & Geoastrophysical Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Growth rate KW - Wakes KW - Temporal variations KW - Turbulent wakes KW - Reynolds Number KW - Growth Rates KW - turbulence KW - Fluid Mechanics KW - Fluid mechanics KW - Dimensional Analysis KW - Yield KW - Eddies KW - Viscosity KW - Numerical simulations KW - Molecular viscosity KW - Reynolds number KW - Initial conditions KW - Eddy viscosity KW - Evolution KW - Q2 09169:Fluid mechanics KW - M2 551.511:Mechanics and Thermodynamics of the Atmosphere (551.511) KW - SW 6010:Structures UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1356933866?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Fluid+Mechanics&rft.atitle=On+the+universality+of+turbulent+axisymmetric+wakes&rft.au=Redford%2C+John+A%3BCastro%2C+Ian+P%3BColeman%2C+Gary+N&rft.aulast=Redford&rft.aufirst=John&rft.date=2012-11-10&rft.volume=710&rft.issue=&rft.spage=419&rft.isbn=&rft.btitle=&rft.title=Journal+of+Fluid+Mechanics&rft.issn=00221120&rft_id=info:doi/10.1017%2Fjfm.2012.371 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-05-01 N1 - Last updated - 2016-03-17 N1 - SubjectsTermNotLitGenreText - Fluid mechanics; Growth rate; Wakes; Temporal variations; Molecular viscosity; Reynolds number; Eddy viscosity; Viscosity; Numerical simulations; Turbulent wakes; Initial conditions; Dimensional Analysis; Yield; Eddies; Reynolds Number; Growth Rates; turbulence; Fluid Mechanics; Evolution DO - http://dx.doi.org/10.1017/jfm.2012.371 ER - TY - CPAPER T1 - Global Response of the Space Shuttle External Tank with the Presence of Intertank Stringer Cracks and Radius Blocks T2 - 2012 ASME International Mechanical Engineering Congress & Exposition AN - 1313073984; 6172802 JF - 2012 ASME International Mechanical Engineering Congress & Exposition AU - Lovejoy, Andrew AU - Rankin, Charles Y1 - 2012/11/09/ PY - 2012 DA - 2012 Nov 09 KW - USA, Connecticut, Hartford Basin, Newark Supergroup, Shuttle KW - space shuttle KW - Pipe stringers UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313073984?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.atitle=Global+Response+of+the+Space+Shuttle+External+Tank+with+the+Presence+of+Intertank+Stringer+Cracks+and+Radius+Blocks&rft.au=Lovejoy%2C+Andrew%3BRankin%2C+Charles&rft.aulast=Lovejoy&rft.aufirst=Andrew&rft.date=2012-11-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2012/ConferenceSchedule.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Evaluation of a Strain-Based Shape Prediction Algorithm for Monitoring of an Uninhabited Air Vehicle T2 - 2012 ASME International Mechanical Engineering Congress & Exposition AN - 1313064237; 6173328 JF - 2012 ASME International Mechanical Engineering Congress & Exposition AU - Alvarenga, Jessica AU - Pena, Francisco AU - Boussalis, Helen Y1 - 2012/11/09/ PY - 2012 DA - 2012 Nov 09 KW - Prediction KW - Mathematical models KW - Algorithms UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313064237?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.atitle=Evaluation+of+a+Strain-Based+Shape+Prediction+Algorithm+for+Monitoring+of+an+Uninhabited+Air+Vehicle&rft.au=Alvarenga%2C+Jessica%3BPena%2C+Francisco%3BBoussalis%2C+Helen&rft.aulast=Alvarenga&rft.aufirst=Jessica&rft.date=2012-11-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2012/ConferenceSchedule.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - On Dynamics of Spinning Structures T2 - 2012 ASME International Mechanical Engineering Congress & Exposition AN - 1313038358; 6171047 JF - 2012 ASME International Mechanical Engineering Congress & Exposition AU - Gupta, Kajal AU - Ibrahim, Adem Y1 - 2012/11/09/ PY - 2012 DA - 2012 Nov 09 KW - Spinning UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313038358?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.atitle=On+Dynamics+of+Spinning+Structures&rft.au=Gupta%2C+Kajal%3BIbrahim%2C+Adem&rft.aulast=Gupta&rft.aufirst=Kajal&rft.date=2012-11-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+ASME+International+Mechanical+Engineering+Congress+%26+Exposition&rft.issn=&rft_id=info:doi/ L2 - http://www.asmeconferences.org/Congress2012/ConferenceSchedule.cfm LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - NEWS T1 - Opposite Behaviors? Arctic Sea Ice Shrinks, Antarctic Grows AN - 1131014234 JF - UPI Space Daily AU - Maria-Jose Vinas for NASA's Earth Science News Y1 - 2012/11/05/ PY - 2012 DA - 2012 Nov 05 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1131014234?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Opposite+Behaviors%3F+Arctic+Sea+Ice+Shrinks%2C+Antarctic+Grows&rft.au=Maria-Jose+Vinas+for+NASA%27s+Earth+Science+News&rft.aulast=Maria-Jose+Vinas+for+NASA%27s+Earth+Science+News&rft.aufirst=&rft.date=2012-11-05&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-11-05 ER - TY - CPAPER T1 - Measuring and Maximizing the Impact of a Federally-Funded Climate Education Portfolio via Strategic Partnerships and Collaborations T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313118436; 6175649 JF - 2012 Annual Meeting of the Geological Society of America AU - Martin, Ann AU - Chambers, Lin AU - Pippin, Margaret AU - Geyer, Andrea AU - Karsten, Jill AU - Baek, John AU - Yue, Sarah Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Portfolios KW - Education KW - Climate UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313118436?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=Measuring+and+Maximizing+the+Impact+of+a+Federally-Funded+Climate+Education+Portfolio+via+Strategic+Partnerships+and+Collaborations&rft.au=Martin%2C+Ann%3BChambers%2C+Lin%3BPippin%2C+Margaret%3BGeyer%2C+Andrea%3BKarsten%2C+Jill%3BBaek%2C+John%3BYue%2C+Sarah&rft.aulast=Martin&rft.aufirst=A&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Antarctic Analog for Dilational Bands on Europa T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313088910; 6175607 JF - 2012 Annual Meeting of the Geological Society of America AU - Hurford, T AU - Brunt, K Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Analogs UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313088910?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=Antarctic+Analog+for+Dilational+Bands+on+Europa&rft.au=Hurford%2C+T%3BBrunt%2C+K&rft.aulast=Hurford&rft.aufirst=T&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Collecting and Processing Rock and Soil Samples on Mars T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313083597; 6174837 JF - 2012 Annual Meeting of the Geological Society of America AU - Anderson, Robert Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Soil UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313083597?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=The+soil-plant-atmosphere+system%3B+past+and+present&rft.au=Berry%2C+J+A%3BBaker%2C+I+T%3BRandall%2C+D+A%3BSellers%2C+P+J%3BAnonymous&rft.aulast=Berry&rft.aufirst=J&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - N(50) Crater Retention Ages for an Expanded Inventory of Lunar Basins: Evidence for an Early Heavy Bombardment and a Late Heavy Bombardment? T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313072727; 6174321 JF - 2012 Annual Meeting of the Geological Society of America AU - Frey, Herbert AU - Burgess, Emily Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Basins KW - Age KW - Craters KW - Inventories UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313072727?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=N%2850%29+Crater+Retention+Ages+for+an+Expanded+Inventory+of+Lunar+Basins%3A+Evidence+for+an+Early+Heavy+Bombardment+and+a+Late+Heavy+Bombardment%3F&rft.au=Frey%2C+Herbert%3BBurgess%2C+Emily&rft.aulast=Frey&rft.aufirst=Herbert&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - High Resolution Gravitational Field of the Moon--Results from the Gravity Recovery and Interior Laboratory Mission T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313072003; 6174318 JF - 2012 Annual Meeting of the Geological Society of America AU - Park, Ryan AU - Asmar, Sami AU - Zuber, Maria AU - Smith, David AU - Konopliv, Alex AU - Watkins, Michael Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Gravity field KW - Gravity UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313072003?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=High+Resolution+Gravitational+Field+of+the+Moon--Results+from+the+Gravity+Recovery+and+Interior+Laboratory+Mission&rft.au=Park%2C+Ryan%3BAsmar%2C+Sami%3BZuber%2C+Maria%3BSmith%2C+David%3BKonopliv%2C+Alex%3BWatkins%2C+Michael&rft.aulast=Park&rft.aufirst=Ryan&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Surface Textures and Features Indicative of Endogenous Growth at the Mccartys Flow Field, Nm, as an Analog to Martian Volcanic Plains T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313047234; 6174099 JF - 2012 Annual Meeting of the Geological Society of America AU - Bleacher, Jacob AU - Crumpler, Larry AU - Zimbelman, James AU - Garry, W AU - Self, Stephen AU - Aubele, Jayne Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Volcanoes KW - Plains KW - Analogs KW - Growth UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313047234?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=Surface+Textures+and+Features+Indicative+of+Endogenous+Growth+at+the+Mccartys+Flow+Field%2C+Nm%2C+as+an+Analog+to+Martian+Volcanic+Plains&rft.au=Bleacher%2C+Jacob%3BCrumpler%2C+Larry%3BZimbelman%2C+James%3BGarry%2C+W%3BSelf%2C+Stephen%3BAubele%2C+Jayne&rft.aulast=Bleacher&rft.aufirst=Jacob&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Geochemical Evidence for Closed- and Open-System Hydrology on Mars T2 - 2012 Annual Meeting of the Geological Society of America AN - 1313040436; 6174598 JF - 2012 Annual Meeting of the Geological Society of America AU - Hurowitz, Joel Y1 - 2012/11/04/ PY - 2012 DA - 2012 Nov 04 KW - Geochemistry KW - Hydrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313040436?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.atitle=Geochemical+Evidence+for+Closed-+and+Open-System+Hydrology+on+Mars&rft.au=Hurowitz%2C+Joel&rft.aulast=Hurowitz&rft.aufirst=Joel&rft.date=2012-11-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+Geological+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - https://gsa.confex.com/gsa/2012AM/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Where Will Curiosity Take Us? AN - 1827928855; PQ0003681146 JF - Astrobiology AU - Voytek, Mary A AD - NASA Headquarters, Washington, DC. Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 1093 EP - 1094 PB - Mary Ann Liebert, Inc., 2 Madison Ave Larchmont NY 10538-1962 United States VL - 12 IS - 11 SN - 1531-1074, 1531-1074 KW - ASFA 1: Biological Sciences & Living Resources; Ecology Abstracts KW - Biology KW - Q1 08202:Geographical distribution UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1827928855?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrobiology&rft.atitle=Where+Will+Curiosity+Take+Us%3F&rft.au=Voytek%2C+Mary+A&rft.aulast=Voytek&rft.aufirst=Mary&rft.date=2012-11-01&rft.volume=12&rft.issue=11&rft.spage=1093&rft.isbn=&rft.btitle=&rft.title=Astrobiology&rft.issn=15311074&rft_id=info:doi/10.1089%2Fast.2012.1022 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-10-01 N1 - Last updated - 2016-12-22 N1 - SubjectsTermNotLitGenreText - Biology DO - http://dx.doi.org/10.1089/ast.2012.1022 ER - TY - JOUR T1 - Global patterns of tectonism on Titan from mountain chains AN - 1477830934; 2014-001780 AB - Several moons in the outer solar system display suggested patterns of global stress fields driven or modified by global forces which affect patterns of tectonism. Europa's tidally induced fracture patterns, Enceladus's tiger stripes, Ganymede's global expansion induced normal faults, and Io's plain ridges are examples of such tectonic patterns. Given its proximity to Saturn, as well as its eccentric orbit, tectonic features and global stresses may be present on Titan as well. Mountain chains observed on Titan's surface by the Cassini RADAR are of possible tectonic origin. The goal of this study is to create a global map of the orientations of mountain chains on Titan in order to identify the sources of tectonic mechanism. The maps used in this research were constructed with ArcGIS using a low resolution cylindrical base map raster, layered with higher resolution Cassini Visual and Infrared Mapping Spectrometer (VIMS) images and Cassini RADAR swaths from the T3 through T69 flybys. We use RADAR imagery to first map Titan's mountain chains; identifying topographically high surface features by a bright-dark pairing and identifying only mountain chains which are inferred to have been formed through endogenic processes. We then used the data obtained within ArcGIS to construct rose diagrams for mountain chain orientations which were then analyzed and compared with stress models. Lastly, we interpret the geophysical implications of the mountain chains and their orientations in order to present a higher-order picture of tectonism on Titan. JF - Abstracts with Programs - Geological Society of America AU - Cook, Casey A AU - Barnes, Jason W AU - Kattenhorn, Simon A AU - Hurford, T A AU - Radebaugh, Jani AU - Stiles, Bryan W AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 328 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - orientation KW - icy satellites KW - imagery KW - patterns KW - global KW - Titan Satellite KW - radar methods KW - tectonics KW - satellites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1477830934?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Global+patterns+of+tectonism+on+Titan+from+mountain+chains&rft.au=Cook%2C+Casey+A%3BBarnes%2C+Jason+W%3BKattenhorn%2C+Simon+A%3BHurford%2C+T+A%3BRadebaugh%2C+Jani%3BStiles%2C+Bryan+W%3BAnonymous&rft.aulast=Cook&rft.aufirst=Casey&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=328&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-01-16 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - global; icy satellites; imagery; orientation; patterns; radar methods; satellites; tectonics; Titan Satellite ER - TY - JOUR T1 - Antarctic analog for dilational bands on Europa AN - 1477830683; 2014-001772 AB - Europa's surface shows signs of extension, which is revealed as lithospheric dilation expressed along ridges, dilational bands and ridged bands. Ridges, the most common tectonic feature on Europa, comprise a central crack flanked by two raised banks a few hundred meters high and each side. Ridges are thought to form along tensile cracks within the ice shell. Dilational bands are usually topographically lower and wider than ridges and display a smooth lineated interior. Some lineaments, ridged bands, have characteristics of both ridges and bands. Together these three classes may represent a continuum of formation in which ridges and dilational bands are end members. A model of ridge formation in which tidal cycling of a crack opens and closes the crack daily, possibly pushing material to the surface and forming a ridge superimposed with a secular dilation of the crack can combine to form the various morphologies described. We will present this model of ridge and band formation, along with an Earth analog from the Antarctic Ross Ice Shelf. Tensile failures in the Ross Ice Shelf exhibit secular dilation, upon which a tidal signal can be seen. From this analog we conclude that the extension model for Europa may be credible and that the secular dilation is most likely from a regional source and not tidally driven. JF - Abstracts with Programs - Geological Society of America AU - Hurford, T A AU - Brunt, K M AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 327 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - models KW - icy satellites KW - Antarctica KW - Europa Satellite KW - lithosphere KW - interplanetary comparison KW - tectonics KW - Galilean satellites KW - satellites KW - dilation KW - extension tectonics KW - 16:Structural geology KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1477830683?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Antarctic+analog+for+dilational+bands+on+Europa&rft.au=Hurford%2C+T+A%3BBrunt%2C+K+M%3BAnonymous&rft.aulast=Hurford&rft.aufirst=T&rft.date=2012-11-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2014-01-01 N1 - PubXState - CO N1 - Last updated - 2014-01-16 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Antarctica; dilation; Europa Satellite; extension tectonics; Galilean satellites; icy satellites; interplanetary comparison; lithosphere; models; satellites; tectonics ER - TY - JOUR T1 - Origin of peak-ring basins on the Moon; implications for crustal structure AN - 1469622041; 2013-097494 AB - Impact basins provide windows into the Moon's crustal structure and stratigraphy. Interpreting the origin of basin materials requires constraints on the processes controlling basin formation and morphology. Peak-ring basins provide important insight into the basin-formation process, as they are transitional between complex craters with central peaks and multi-ring basins. New image and altimetry data from the Lunar Reconnaissance Orbiter have permitted a reassessment of the origin of lunar peak-ring basins. We synthesize new morphometric observations of lunar peak-ring basins to construct a model for their formation via modification of an interior melt cavity. At the onset diameter of peak-ring basins, the volume and depth of melting are great enough to modify the interior morphology of the basin. The depth of this nested melt cavity is near the transient crater depth, creating a strengthless interior cavity that facilitates gravitational collapse of the transient crater. On the Moon, maximum melting depths are near or exceed the crust-mantle boundary; impact melt in peak-ring basins is thus composed primarily of lower crustal material and some mantle material. Peak rings are formed by the interaction of the inward and upward collapse of the rim of the transient cavity, which uplifts the unmelted base of the excavation cavity. The diameter of the melt cavity is about a factor of five to ten smaller than the current peak-ring diameter, suggesting that peak rings are formed from material uplifted between the edge of the melt cavity and rim of the transient crater. This predicts peak-ring sampling depths much shallower than the maximum depth of melting. The final configuration of the peak-ring basin has a several kilometers-thick slab of cooled impact melt on an uplifted mantle plug with little solid crustal material. Highly faulted and fractured and possibly thickened crust should occur below and outward from the peak ring due to inward and upward translation of collapsed transient crater rim material. This formation scenario has important implications for the interpretation of GRAIL gravity data over basins. The gravity structure should reflect a high density, uplifted impact melt plus mantle zone confined within the peak ring, which is surrounded by a highly fractured, low density zone of possibly thickened crust. JF - Abstracts with Programs - Geological Society of America AU - Baker, David M H AU - Head, James W AU - Neumann, Gregory A AU - Smith, David E AU - Zuber, Maria T AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 532 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - processes KW - impact features KW - density KW - Moon KW - Lunar Reconnaissance Orbiter KW - GRAIL KW - melts KW - fractures KW - controls KW - craters KW - basins KW - impact craters KW - Gravity Recovery and Interior Laboratory KW - crust KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469622041?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Origin+of+peak-ring+basins+on+the+Moon%3B+implications+for+crustal+structure&rft.au=Baker%2C+David+M+H%3BHead%2C+James+W%3BNeumann%2C+Gregory+A%3BSmith%2C+David+E%3BZuber%2C+Maria+T%3BAnonymous&rft.aulast=Baker&rft.aufirst=David+M&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=532&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-12-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - basins; controls; craters; crust; density; fractures; GRAIL; Gravity Recovery and Interior Laboratory; impact craters; impact features; Lunar Reconnaissance Orbiter; melts; Moon; processes ER - TY - JOUR T1 - Testing hypotheses of origin for lunar floor-fractured craters; viscous relaxation versus magmatic intrusion and predictions of associated gravity anomalies AN - 1469622002; 2013-097490 AB - Floor-fractured craters are a class of lunar craters characterized by their anomalously shallow, fractured floors [Schultz 1976; Jozwiak et. al. 2012]; two formation mechanisms have been proposed: 1) viscous relaxation 2) magmatic intrusion and sill formation. Recent morphologic and morphometric analysis of floor-fractured craters using Lunar Orbiter Laser Altimeter (LOLA) data [Jozwiak et al. 2012] supports the hypothesis that magmatic intrusion and sill formation is a viable mechanism for creating the range of morphologies observed in floor-fractured craters. To further test this hypothesis, we analyze the mechanics of magmatic intrusion and sill formation beneath crater floors. We then make predictions about the magnitude of gravity anomalies that could be associated with both magmatic intrusions and viscously relaxed craters. These analyses allow us to provide predictions for the Gravity Recovery and Interior Laboratory (GRAIL) mission so that this mission can provide definitive distinctions between the two hypotheses. These predictions will allow for direct investigation of the hypothesis that floor-fractured craters are formed by sub-crater magmatic intrusion and sill formation. If an origin for floor-fractured crater formation via magmatic intrusion and sill formation is confirmed, this would provide new constraints on the thermal evolution of the Moon and indicate the presence of widely distributed intrusive volcanism. Schultz, P., 1976, Floor-Fractured lunar craters: Moon, vol. 15, p. 241-273. Jozwiak, L., Head, J., Zuber, M., Smith, D., and Neumann , G., 2012, Lunar Floor-Fractured Craters: Classification, Distribution, Origin and Implications for Magmatism and Shallow Crustal Structure: Journal of Geophysical Research-Planets, in revision. JF - Abstracts with Programs - Geological Society of America AU - Jozwiak, Lauren AU - Head, James W AU - Zuber, Maria T AU - Smith, David E AU - Neumann, Gregory A AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 531 EP - 532 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - Lunar Orbiter Laser Altimeter KW - Moon KW - government agencies KW - relaxation KW - GRAIL KW - sills KW - lunar craters KW - gravity anomalies KW - fractures KW - intrusions KW - craters KW - volcanism KW - NASA KW - magmas KW - Gravity Recovery And Interior Laboratory KW - testing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469622002?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Testing+hypotheses+of+origin+for+lunar+floor-fractured+craters%3B+viscous+relaxation+versus+magmatic+intrusion+and+predictions+of+associated+gravity+anomalies&rft.au=Jozwiak%2C+Lauren%3BHead%2C+James+W%3BZuber%2C+Maria+T%3BSmith%2C+David+E%3BNeumann%2C+Gregory+A%3BAnonymous&rft.aulast=Jozwiak&rft.aufirst=Lauren&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=531&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 2 N1 - PubXState - CO N1 - Last updated - 2013-12-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - craters; fractures; government agencies; GRAIL; gravity anomalies; Gravity Recovery And Interior Laboratory; intrusions; lunar craters; Lunar Orbiter Laser Altimeter; magmas; Moon; NASA; relaxation; sills; testing; volcanism ER - TY - JOUR T1 - The extreme melt event of 2012 across the Greenland ice surface; a sudden anomaly since the Medieval Warm Period AN - 1469621904; 2013-097290 AB - The Greenland ice sheet (GIS) holds a massive capacity of water equivalent of 6-7 m in sea level rise (SLR) by its complete melt. From satellite remote sensing, we present here the discovery of the 2012 extreme melt across almost the entire GIS surface. This extreme melt event was first observed from Oceansat-2 satellite scatterometer (OS2) near-real-time data, which was rapidly confirmed by Moderate-resolution Imaging Spectroradiometer (MODIS) and subsequently by Special Sensor Microwave Imager/Sounder (SSMIS) satellite measurements. In-situ temperature data and field observations provided further evidence of the melt event. To obtain the most complete melt detectable across the ice sheet, composite melt maps are produced from the combination of OS2/MODIS/SSMIS with a satellite integration algorithm developed under the NASA Science Innovation Fund for Greenland melt research. Satellite results reveal that melt occurred at or near the surface across 97% of the entire GIS extent on 12 July 2012, including the cold polar areas at high altitudes like Summit in the dry snow facies of the ice sheet. This melt event coincided with an anomalous ridge of warm air that became stagnant over Greenland. As seen in melt layers from the ice core record at Summit reported in the published literatures, such a melt event is rare with the last significant one occurring in 1889 and the next previous one approximately 680 years earlier in the Medieval Warm Period (a.k.a. the Medieval Climatic Anomaly). Compared to the 7-century interval between the previous two events, the 2012 extreme melt occurred only over a century from the 1889 event. In this respect, the 2012 event is considered as a sudden anomaly since the Medieval Warm Period. These significant melt events are widely sporadic in different periods of the Holocene, clearly exhibiting their non-stationary behavior. Regarding the implication on SLR, the change in total GIS mass balance is intricately dependent on competitive changes in mass outflux (e.g., snowmelt, glacier calving) and influx (e.g., snow accumulation). Extreme events of snow accumulation can also be observed by satellite remote sensing. Thus, spatially extensive measurements from multiple satellites are critical to closely monitoring the change in GIS mass balance for an accurate estimation of its contribution to SLR. JF - Abstracts with Programs - Geological Society of America AU - Nghiem, Son V AU - Hall, Dorothy AU - Mote, Thomas AU - Tedesco, Marco AU - Albert, Mary AU - Keegan, Kaitlin AU - Shuman, Christopher AU - DiGirolamo, Nick AU - Neumann, Gregory A AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 496 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - ice cores KW - Quaternary KW - geophysical surveys KW - Arctic region KW - Greenland ice sheet KW - satellite methods KW - Holocene KW - ice sheets KW - Cenozoic KW - Greenland KW - melting KW - geographic information systems KW - mass balance KW - surveys KW - information systems KW - glacial geology KW - algorithms KW - Medieval Warm Period KW - remote sensing KW - MODIS KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469621904?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+extreme+melt+event+of+2012+across+the+Greenland+ice+surface%3B+a+sudden+anomaly+since+the+Medieval+Warm+Period&rft.au=Nghiem%2C+Son+V%3BHall%2C+Dorothy%3BMote%2C+Thomas%3BTedesco%2C+Marco%3BAlbert%2C+Mary%3BKeegan%2C+Kaitlin%3BShuman%2C+Christopher%3BDiGirolamo%2C+Nick%3BNeumann%2C+Gregory+A%3BAnonymous&rft.aulast=Nghiem&rft.aufirst=Son&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=496&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-12-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - algorithms; Arctic region; Cenozoic; geographic information systems; geophysical surveys; glacial geology; Greenland; Greenland ice sheet; Holocene; ice cores; ice sheets; information systems; mass balance; Medieval Warm Period; melting; MODIS; Quaternary; remote sensing; satellite methods; surveys ER - TY - JOUR T1 - N(50) crater retention ages for an expanded inventory of lunar basins; evidence for an early heavy bombardment and a late heavy bombardment? AN - 1469621792; 2013-097495 AB - LOLA topography and LOLA-derived crustal thickness data provide evidence for a population of impact basins on the Moon that is likely a factor 2 larger than the classical lists based on photogeology. Frey (2012) determined N(50) crater retention ages (CRAs) for 83 candidate basins > 300 km in diameter by counting LOLA-identified craters superimposed over the whole area of the basins. For some basins identified in topography or model crustal thickness it is not possible to unambiguously identify the crater rim as is traditionally done. Also, Quasi-Circular Depressions (QCDs) > 50 km in diameter are recognizable in the mare-filled centers of many basins. Even though these are not apparent in image data, they likely represent buried impact craters superimposed on the basin floor prior to mare infilling and so should be counted in determining the age of the basin. Including these as well as the entire area of the basins improves the statistics, though the error bars are still large when using only craters > 50 km in diameter. The distribution of N(50) CRAs had two distinct peaks which did not depend on whether the basins were named (based on photogeology) or recognized first in topography or crustal thickness data. It also did not depend on basin diameters (both larger and smaller basins made up both peaks) and both peaks persisted even when weaker candidates were excluded. Burgess (2012, unpublished data) redid the counts for 85 basins but improved on the earlier effort by adjusting the counting area where basins overlap. The two peak distribution of N(50) ages was confirmed, with a younger peak at N(50) approximately 40-50 and an older peak at N(50) approximately 80-90 (craters > 50 km diameter per million square km). We suggest this could represent two distinct populations of impactors on the Moon: one producing an Early Heavy Bombardment (EHB) that predates Nectaris and the second responsible for the more widely recognized Late Heavy Bombardment (LHB). JF - Abstracts with Programs - Geological Society of America AU - Frey, Herbert AU - Burgess, Emily AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 532 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - models KW - Lunar Orbiter Laser Altimeter KW - topography KW - impact features KW - craters KW - Moon KW - inventory KW - basins KW - thickness KW - impact craters KW - crust KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469621792?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=N%2850%29+crater+retention+ages+for+an+expanded+inventory+of+lunar+basins%3B+evidence+for+an+early+heavy+bombardment+and+a+late+heavy+bombardment%3F&rft.au=Frey%2C+Herbert%3BBurgess%2C+Emily%3BAnonymous&rft.aulast=Frey&rft.aufirst=Herbert&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=532&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-12-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - basins; craters; crust; impact craters; impact features; inventory; Lunar Orbiter Laser Altimeter; models; Moon; thickness; topography ER - TY - JOUR T1 - Lunar Orientale Basin; a comprehensive conceptual model for the origin of basin rings and geological units from new spacecraft data AN - 1469621682; 2013-097499 AB - The approximately 930 km diameter Orientale basin, the youngest and least modified multi-ring basin, provides key insights into the nature of basin-forming processes in early lunar and planetary history. New altimetry and image data show that the transition from complex craters to peak-ring basins involves morphometric changes that signal the growth and increasing influence of a nested melt cavity; a major manifestation of this is the change from expanding central peak width in complex craters to peak rings that represent the toes of listric wall collapse thrusting inward and upward to the crater floor. Altimetry data permit calculation of Hevelius Formation ejecta thickness decay and volume. Detrended altimetry data reveal buried craters up to the Cordillera ring but not inside the Outer Rook (OR) ring, and ghosts of secondary crater chains that extend up to the OR; these and related data place the approximate final transient cavity rim crest at the 620 km diameter Outer Rook ring, with the Inner Rook representing the peak ring. The knobby Montes Rook Formation (MRF) is interpreted to represent the collapsed transient cavity rim, consisting of the structurally uplifted rim formed from material underthrust from the adjacent transient cavity, and superposed by a huge load of many kilometers of Orientale basin ejecta; during the cavity modification stage, downward and inward translation of the rim at approximately the outer edge of structural uplift formed the Cordillera listric fault ring, causing rotation and translation of the OR Mountains, and the shedding of ejecta outward from the uplifted massifs into the newly formed trough to create the knobby MRF. The inner depression stepdown is interpreted as the surface of a huge cooled impact melt sea, 10-15 km thick and likely to be differentiated. These observations are consistent with a nested melt-cavity basin formation model in which the OR represents the transient cavity, the melt sea represents the collapsed melt cavity, and the peak-ring plateau and MRF represent manifestations of the gravity-driven rotational collapse of the basin rim crest. This model predicts that the nested melt cavity penetrated many tens of km into the mantle, and that basin collapse involved rapid intrusion of a mantle plug into the crust, facilitated by transient shock weakening of deeper crust/mantle material. JF - Abstracts with Programs - Geological Society of America AU - Head, James W AU - Baker, David M H AU - Neumann, Gregory A AU - Smith, David E AU - Zuber, Maria T AU - Vaughan, William M AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 533 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - models KW - imagery KW - craters KW - Moon KW - Mare Orientale KW - uplifts KW - mantle KW - Montes Rook Formation KW - altimetry KW - ejecta KW - crust KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1469621682?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Lunar+Orientale+Basin%3B+a+comprehensive+conceptual+model+for+the+origin+of+basin+rings+and+geological+units+from+new+spacecraft+data&rft.au=Head%2C+James+W%3BBaker%2C+David+M+H%3BNeumann%2C+Gregory+A%3BSmith%2C+David+E%3BZuber%2C+Maria+T%3BVaughan%2C+William+M%3BAnonymous&rft.aulast=Head&rft.aufirst=James&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=533&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-12-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - altimetry; craters; crust; ejecta; imagery; mantle; Mare Orientale; models; Montes Rook Formation; Moon; uplifts ER - TY - JOUR T1 - Landsat; viewing Earth and teaching 21st century geoscience from a planetary perspective AN - 1464888730; 2013-092858 AB - It is now possible, and appropriate, to teach geologic processes with examples from many planets and to bring this knowledge "home" to more effectively teach terrestrial geoscience in the 21 (super st) century. Observing Earth from space, with image sets such as Landsat, brings new perspectives to the study of our planet and new ways of solving problems for our communities. The Landsat system originated in 1972, and we now have four decades of Landsat images of Earth that can be used to compare and contrast the effects of geologic processes on our own planet. The treasure trove of Landsat data is now available at no cost, and there is no-cost software to use to study landforms and cities, and to analyze change over time. With Landsat, students from elementary through undergraduate, teachers at all levels, and the general public can see and study the effects of forest fires, assess the health of agricultural fields, monitor the growth of cities, and estimate the extent of future natural disasters such as volcanoes and floods. Elementary through high school science and classroom teachers can easily learn how Landsat images are made and to use the "power in the pixel" with an educational program called "Adopt a Pixel." Formal and informal teachers of all grade levels can download and use Landsat scenes of almost anywhere on Earth, especially their students' own state, region, or town. When terrestrial geological processes and planetary analogs are compared with high-resolution planetary images of other planets, for example the Mars Reconnaisance Orbiter HiRISE images, this type of learning tool can: (1) bring the excitement of solar system exploration to learning about Earth; (2) show ways that our understanding of Earth helps us to interpret and understand data about other planets, and ways that our understanding of other planets has influenced our study of Earth; and (3) look for and monitor indicators of global change on Earth. JF - Abstracts with Programs - Geological Society of America AU - Aubele, Jayne C AU - Allen, Jeannie AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 447 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - processes KW - Landsat KW - imagery KW - K-12 education KW - Earth KW - education KW - remote sensing KW - observations KW - 15:Miscellaneous UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464888730?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Landsat%3B+viewing+Earth+and+teaching+21st+century+geoscience+from+a+planetary+perspective&rft.au=Aubele%2C+Jayne+C%3BAllen%2C+Jeannie%3BAnonymous&rft.aulast=Aubele&rft.aufirst=Jayne&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=447&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-12-05 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Earth; education; imagery; K-12 education; Landsat; observations; processes; remote sensing ER - TY - JOUR T1 - Climate change and climate modeling; reaching teachers through an online professional development course AN - 1464885814; 2013-090470 AB - As national and state-level K-12 science education frameworks and standards begin to explicitly incorporate the principles of climate literacy (Climate Literacy: The Essential Principles of Climate Sciences, USGCRP, 2009), teachers are seeking opportunities to enhance their own knowledge of climate science and climate change, as well as data and modeling tools that can enhance their students' classroom experience. To help address this need, the American Museum of Natural History has developed a graduate-level teacher professional development course, Seminars on Science: Climate Change. The 6-week, online-only course covers a broad range of topics, including the fundamentals of the climate system (relevant to earth surface processes); the natural and human causes of climate change; the role of paleoclimate investigations in understanding climate variability; and a discussion of potential consequences and risks of future climate change. An important aspect of AMNH's Seminars on Science: Climate Change is the inclusion of hands-on experience with a full-fledged 3D global climate model (GCM) through a partnership with Columbia University's Educational Global Climate Modeling Project (EdGCM). Through the use of EdGCM, participants are able to work directly with one of the key tools employed in climate change and climate impacts research, an experience that can later be repeated (at appropriate levels of complexity) with their own students. Step-by-step EdGCM exercises walk course participants through the process of simulating climate scenarios and analyzing model output, in a fashion designed to emulate the workflow in scientific research. The EdGCM experience is key to helping the teacher participants to better understand the strengths and limitations of models in climate change research. Together with the other course content, EdGCM provides teachers with the background needed to develop student materials that take a true systems approach to earth science studies. Since AMNH began offering Seminars on Science: Climate Change in 2010, it has become one of the most popular courses offered by the Museum. Although the participants often find the exercises challenging, many report a high level of satisfaction in using EdGCM. JF - Abstracts with Programs - Geological Society of America AU - Randle, David AU - Sohl, Linda E AU - Chandler, Mark A AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 575 EP - 576 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - programs KW - curricula KW - education KW - climate change KW - teacher education KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1464885814?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Climate+change+and+climate+modeling%3B+reaching+teachers+through+an+online+professional+development+course&rft.au=Randle%2C+David%3BSohl%2C+Linda+E%3BChandler%2C+Mark+A%3BAnonymous&rft.aulast=Randle&rft.aufirst=David&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=575&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-12-05 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - climate change; curricula; education; programs; teacher education ER - TY - JOUR T1 - Understanding early volcanism on the terrestrial planets; comparison of lunar cryptomare deposits and intercrater plains on Mercury AN - 1447103911; 2013-083335 AB - Volcanism is a process that can be identified on all of the terrestrial planets. The Moon and Mercury are better able to preserve their most ancient deposits because of their lack of plate tectonics and fluvial and aeolian erosional processes. Knowing the areal extent and spatial distribution of ancient volcanic deposits can aid in our understanding of the thermal history of a planetary body. However, before their spatial extent can be mapped, it is necessary to establish identification criteria in order to distinguish them from non-volcanic plains, such as the lunar light smooth plains deposits formed by impact processes. Studies of the lunar cryptomaria deposits and intercrater plains on Mercury can help to understand and distinguish among the different types of plains units. One important step to understanding the distribution of ancient volcanic deposits is quantifying how ancient terrains fill with volcanic material. Artificial flooding experiments using Lunar Orbiter Laser Altimeter (LOLA) topography data have been conducted on the Moon in heavily cratered terrain and a large basin to determine how they might fill with volcanic material. Map patterns and areal and volume measurements are compared with observed deposits on the Moon and Mercury. Additionally, the Schiller-Schickard region on the Moon represents a lunar analog of the types of stratigraphic relationships possibly present in the intercrater plains on Mercury, because it contains smooth ejecta deposits, maria, and cryptomare deposits. The intercrater plains are among the most heavily cratered terrain on Mercury and are thought to represent an areally substantial series of volcanic resurfacing events. However, some areas mapped as intercrater plains may not have been part of these events and may be impact deposits. Lunar cryptomare identified in the Schiller-Schickard region have likely been formed by Orientale basin ejecta and illustrate relations between volcanic smooth plains and impact-related plains material. Understanding the relationship between these two types of lunar plains materials will aid in understanding the formation of intercrater plains deposits on Mercury. JF - Abstracts with Programs - Geological Society of America AU - Whitten, Jennifer L AU - Head, James W AU - Pieters, Carle M AU - Murchie, Scott L AU - Blewett, David T AU - Denevi, Brett W AU - Neumann, Gregory A AU - Zuber, Maria T AU - Smith, David E AU - Solomon, Sean C AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 276 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - processes KW - Lunar Orbiter Laser Altimeter KW - impact features KW - Moon KW - impacts KW - thermal history KW - maria KW - terrestrial planets KW - spatial distribution KW - planets KW - volcanism KW - identification KW - Mercury Planet KW - interplanetary comparison KW - plains KW - impact craters KW - preservation KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447103911?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Understanding+early+volcanism+on+the+terrestrial+planets%3B+comparison+of+lunar+cryptomare+deposits+and+intercrater+plains+on+Mercury&rft.au=Whitten%2C+Jennifer+L%3BHead%2C+James+W%3BPieters%2C+Carle+M%3BMurchie%2C+Scott+L%3BBlewett%2C+David+T%3BDenevi%2C+Brett+W%3BNeumann%2C+Gregory+A%3BZuber%2C+Maria+T%3BSmith%2C+David+E%3BSolomon%2C+Sean+C%3BAnonymous&rft.aulast=Whitten&rft.aufirst=Jennifer&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=276&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-31 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - identification; impact craters; impact features; impacts; interplanetary comparison; Lunar Orbiter Laser Altimeter; maria; Mercury Planet; Moon; plains; planets; preservation; processes; spatial distribution; terrestrial planets; thermal history; volcanism ER - TY - JOUR T1 - Quantitative comparison of Shoemaker Formation ejecta with Ries Crater breccia and suevite AN - 1447103824; 2013-083342 AB - The rover Opportunity has examined rocks that lie on the rim of the Endeavour impact crater on Mars. These basaltic impact breccias were imaged by Opportunity using its 360 degree panoramic cameras. It is proposed that these rocks are examples of the suevite found at Ries Crater in Germany. Suevite is a breccia characterized by angular clasts of rocks and minerals as well as impact glasses, set in a fine-grained matrix. The objective of this study is to understand the processes under which Endeavour crater formed. The area, perimeter, and circularity of the clasts within the Endeavour ejecta were measured and compared to previously published clast measurements from Ries suevite. Preliminary results show the Endeavour clasts are more evenly distributed over all size ranges, whereas the majority of clasts from Ries suevites lie within a narrow range of sizes. The size "sorting" displayed in the Ries suevites and the even distribution of clasts from Endeavour crater may indicate that the Endeavour rocks were part of the ballistic impact deposits in contrast to the fallout suevite. JF - Abstracts with Programs - Geological Society of America AU - Piazza, Olivia AU - Cohen, Barbara A AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 277 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - Shoemaker Formation KW - breccia KW - impactites KW - Opportunity Rover KW - Moon KW - Bavaria Germany KW - Europe KW - impact breccia KW - clasts KW - ejecta KW - Mars Exploration Rover KW - quantitative analysis KW - Central Europe KW - metamorphic rocks KW - Ries Crater KW - interplanetary comparison KW - suevite KW - Germany KW - Endeavour Crater KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447103824?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Quantitative+comparison+of+Shoemaker+Formation+ejecta+with+Ries+Crater+breccia+and+suevite&rft.au=Piazza%2C+Olivia%3BCohen%2C+Barbara+A%3BAnonymous&rft.aulast=Piazza&rft.aufirst=Olivia&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=277&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-31 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Bavaria Germany; breccia; Central Europe; clasts; ejecta; Endeavour Crater; Europe; Germany; impact breccia; impactites; interplanetary comparison; Mars Exploration Rover; metamorphic rocks; Moon; Opportunity Rover; quantitative analysis; Ries Crater; Shoemaker Formation; suevite ER - TY - JOUR T1 - The contrasting age ranges of large plutons and monotonous intermediates AN - 1447102525; 2013-084573 AB - Monotonous intermediates (MIs) are homogenous crystal-rich dacites that can erupt in very large volumes (e.g., Fish Canyon Tuff (FCT), 5,000 km (super 3) ). Because of the chemical similarity of MIs to large granodiorite plutons some have proposed that the plutons represent MIs that stalled in the crust prior to eruption. Intermediate magma is hypothesized to accumulate incrementally until a large, persistent mush (50+% crystals) is developed. Injection of a mafic magma may rejuvenate the mush resulting in eruption of a crystal-rich ignimbrite. If the mush is not rejuvenated, it will fully crystallize as a granodiorite pluton. Zircon U-Pb ages from intrusive suites consistently yield magmatic fluxes of 10 (super -3) - 10 (super -4) km (super 3) /a. In contrast, zircon data for MIs yield fluxes that are at least an order of magnitude greater than plutonic rocks (10 (super -2) km (super 3) /a). Thus, whereas plutons typically preserve a record of zircon crystallization that spans 10 (super 6) -10 (super 7) a, MIs of comparable volume preserve a crystallization record on the order of 10 (super 5) a. This difference might indicate that the hypothesized link between the two rock types is incorrect, or could be a reflection of the proposed difference in their T-t histories. One possibility is that the rejuvenation events inferred to have affected MIs prior to their eruptions dissolved zircon during reheating (e.g., FCT, 715-760 degrees C). However, simulations based on Watson (1996) suggest that even in the favorable case of reheating over 200 ka in a melt with no dissolved Zr, zircons with radii approximately 100 mu m may survive the event. Events with shorter heating timespans and less Zr undersaturation permit much smaller zircons to survive. These results suggest it is unlikely that zircon evidence for multi-Ma mush growth in MIs would be obliterated--a result that is supported by the occurrence of xenocrystic zircon cores preserved in many MIs. We suggest that the difference in age spans between MIs and plutons is related to different magma accumulation rates. Thus, the information recorded by zircon in MIs is indicative of high flux events that favor large eruptions rather than stalling magma in the crust. JF - Abstracts with Programs - Geological Society of America AU - Frazer, Ryan E AU - Mills, Ryan D AU - Coleman, Drew S AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 322 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - United States KW - silicates KW - volcanic rocks KW - U/Pb KW - igneous rocks KW - Cenozoic KW - dates KW - orthosilicates KW - absolute age KW - dacites KW - zircon group KW - plutons KW - solutes KW - zircon KW - Paleogene KW - nesosilicates KW - Tertiary KW - intrusions KW - saturation KW - magmas KW - eruptions KW - xenocrysts KW - Fish Canyon Tuff KW - Colorado KW - Oligocene KW - 03:Geochronology KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447102525?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+contrasting+age+ranges+of+large+plutons+and+monotonous+intermediates&rft.au=Frazer%2C+Ryan+E%3BMills%2C+Ryan+D%3BColeman%2C+Drew+S%3BAnonymous&rft.aulast=Roush&rft.aufirst=T&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-31 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - absolute age; Cenozoic; Colorado; dacites; dates; eruptions; Fish Canyon Tuff; igneous rocks; intrusions; magmas; nesosilicates; Oligocene; orthosilicates; Paleogene; plutons; saturation; silicates; solutes; Tertiary; U/Pb; United States; volcanic rocks; xenocrysts; zircon; zircon group ER - TY - JOUR T1 - Measuring and maximizing the impact of a federally-funded climate education portfolio via strategic partnerships and collaborations AN - 1447102364; 2013-084591 AB - NASA Innovations in Climate Education (NICE) at Langley Research Center has funded 71 climate education initiatives since 2008. A key component of NICE's program model is a commitment to fostering and facilitating a community among our awardees. Recently, we have prioritized the growth of a parallel community of NICE project evaluators. Face-to-face meetings, dedicated webspace for sharing evaluation-related resources, and quarterly webinars allow project evaluators to leverage prior work and incorporate common or useful instruments and tools. We aim to maximize the impact of the funded portfolio through this community of practice, and further through a tri-agency collaboration with sister initiatives at NOAA and NSF. Along with the benefits this community provides to the funded educational and evaluation activities, these efforts also reflect the commitment of NICE and the tri-agency collaboration to government-wide alignment of STEM education activities and evaluations across Federal agencies (e.g., the recommendations of the National Science and Technology Council (NSTC) Committee on STEM Education). Through the formation of a Tri-Agency Common Evaluation Framework working group, these three agencies are involved in coordination of evaluation across the tri-agency portfolio. In April 2012, the working group, comprising representatives of these agencies, the funded projects, and their evaluators, met in Arlington, VA to take early steps in the development of a framework for the common evaluation of this diverse portfolio. The common framework and nascent draft logic model have taken into consideration common evaluation-related needs, the articulation of common goals and desired impacts, and available or needed instruments and/or methodologies in this field. In late October 2012, this framework and the next steps will be discussed in detail by the environmental evaluation community during the American Evaluation Association annual meeting. This talk will describe NICE's efforts to assemble, synthesize, and share climate literacy-focused evaluation instruments, tools, and resources. We'll also report on updates to the efforts of the tri-agency collaboration to establish a common evaluation framework, and on the feedback received from members of the American Evaluation Association. JF - Abstracts with Programs - Geological Society of America AU - Martin, Ann M AU - Chambers, Lin H AU - Pippin, Margaret R AU - Geyer, Andrea AU - Karsten, Jill AU - Baek, John AU - Yue, Sarah AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 468 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - public awareness KW - education KW - climate change KW - evaluation KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447102364?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Measuring+and+maximizing+the+impact+of+a+federally-funded+climate+education+portfolio+via+strategic+partnerships+and+collaborations&rft.au=Martin%2C+Ann+M%3BChambers%2C+Lin+H%3BPippin%2C+Margaret+R%3BGeyer%2C+Andrea%3BKarsten%2C+Jill%3BBaek%2C+John%3BYue%2C+Sarah%3BAnonymous&rft.aulast=Martin&rft.aufirst=Ann&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=468&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-31 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - climate change; education; evaluation; public awareness ER - TY - JOUR T1 - Online and blended climate change courses for secondary school educators from the American Museum of Natural History AN - 1447101089; 2013-084601 AB - The American Museum of Natural History (AMNH) has created both online and blended climate change education courses directed toward secondary school educators. The online course carries graduate credit and is authored by leading scientists at AMNH and at NASA's Goddard Institute for Space Studies. It focuses on weather and climate; sources of climate change; the response of the climate system to input; modeling, theory and observation; what we can learn from past climates; and potential consequences, risks and uncertainties. The blended course includes an abbreviated version of the online course along with additional activities, many suitable for classroom use. Both the online and blended course experiences will be reviewed, including the use of an educational version of NASA's Global Climate Model. Attendees will be provided with a DVD of Climate Change videos and data visualizations from the American Museum of Natural History. JF - Abstracts with Programs - Geological Society of America AU - Steiner, Robert AU - Kinzler, Rosamond J AU - Contino, Julie AU - Mathez, Edmond A AU - Randle, David AU - Schmidt, Gavin AU - Shindell, Drew AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 470 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - museums KW - curricula KW - American Museum of Natural History KW - climate change KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447101089?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Online+and+blended+climate+change+courses+for+secondary+school+educators+from+the+American+Museum+of+Natural+History&rft.au=Steiner%2C+Robert%3BKinzler%2C+Rosamond+J%3BContino%2C+Julie%3BMathez%2C+Edmond+A%3BRandle%2C+David%3BSchmidt%2C+Gavin%3BShindell%2C+Drew%3BAnonymous&rft.aulast=Steiner&rft.aufirst=Robert&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=470&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-31 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - American Museum of Natural History; climate change; curricula; museums ER - TY - JOUR T1 - Information needs of the U.S. public on climate and global change; a strategy for communication, education, and engagement AN - 1447100886; 2013-084604 AB - Climate science is a complex and challenging area. Yet, it is increasingly important for the public to have a sound scientific understanding of climate and global change decision-making, including uncertainty. Understanding uncertainty is a critical thinking skill and is an element of improved understanding of science. It is important for citizens to consider the limitations of science such that outcomes may have limited predictability. Engaging climate education and communication is a primary role of the U.S. Global Change Research Program (USGCRP), a congressionally mandated consortium of 13 Federal agencies that works to build a sound scientific foundation for global change knowledge, skill, and decision making. The USGCRP strategy for communication, education, and engagement efforts addresses the need for broadening public awareness and understanding of global change through better understanding of citizens' existing knowledge and information needs. The communication and education objectives complement efforts described in other USGCRP strategic goals such as advancing scientific knowledge of the integrated components of the Earth system. JF - Abstracts with Programs - Geological Society of America AU - Suiter, Marilyn J AU - Wood, Karen AU - Wei, Ming-Ying AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 471 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - United States KW - U. S. Global Change Research Program KW - public awareness KW - communication KW - global change KW - education KW - climate change KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1447100886?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Information+needs+of+the+U.S.+public+on+climate+and+global+change%3B+a+strategy+for+communication%2C+education%2C+and+engagement&rft.au=Suiter%2C+Marilyn+J%3BWood%2C+Karen%3BWei%2C+Ming-Ying%3BAnonymous&rft.aulast=Suiter&rft.aufirst=Marilyn&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=471&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-31 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - climate change; communication; education; global change; public awareness; U. S. Global Change Research Program; United States ER - TY - JOUR T1 - Thermal behavior of unusual local-scale features on Vesta AN - 1442375735; 2013-079434 AB - On Vesta, the thermal behavior of areas of unusual albedo seen at the local scale can be related to physical properties that can provide information about the origin of those materials. Dawn's Visible and Infrared Mapping Spectrometer (VIR) hyperspectral cubes are used to retrieve surface temperatures and emissivities, with high accuracy as long as temperatures are greater than approximately 180 K. Data acquired in the Survey phase (23 July through 29 August 2011) show several unusual surface features: 1) high-albedo (bright) and low-albedo (dark) material deposits, 2) spectrally distinct ejecta and "pitted" materials, 3) regions suggesting finer-grained materials. Some of the unusual dark and bright features were re-observed by VIR in the subsequent High-Altitude Mapping Orbit (HAMO) and Low-Altitude Mapping Orbit (LAMO) phases at increased pixel resolution. In particular, bright and dark surface materials on Vesta, and pitted materials, are currently being investigated by the Dawn team. In this work we present temperature maps and emissivities of several local-scale features that were observed by Dawn under different illumination conditions and different local solar times. To calculate surface temperatures, we applied a Bayesian approach to nonlinear inversion based on the Kirchhoff law and the Planck function, and whose results were compared with those provided by the application of alternative methods. Data from the IR channel of VIR show that bright regions generally correspond to regions with lower thermal emission, i.e. lower temperature, while dark regions correspond to areas with higher thermal emission, i.e. higher temperature. This behavior confirms that many of the dark appearances in the VIS mainly reflect albedo variations, and not, for example, shadowing. During maximum daily insolation, dark features in the equatorial region may rise to temperatures greater than 270 K, while brightest features stop at roughly 258 K for similar local solar times. However, "pitted" materials, showing relatively low reflectance, have significantly lower temperatures, as a result of differences in composition and/or structure (e.g, average grain size of the surface regolith, porosity, etc.). To complement this work, we provide preliminary values of thermal inertia for some bright and dark features. JF - Abstracts with Programs - Geological Society of America AU - Tosi, Federico AU - Capria, Maria Teresa AU - De Sanctis, Maria Cristina AU - Palomba, Ernesto AU - Capaccioni, Fabrizio AU - Combe, Jean-Philippe AU - Titus, Timothy AU - Mittlefehldt, David W AU - Li, Jian-Yang AU - Russell, Christopher T AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 376 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - albedo KW - physical properties KW - asteroids KW - Vesta Asteroid KW - thermal properties KW - emissivity KW - temperature KW - Dawn KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442375735?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Thermal+behavior+of+unusual+local-scale+features+on+Vesta&rft.au=Tosi%2C+Federico%3BCapria%2C+Maria+Teresa%3BDe+Sanctis%2C+Maria+Cristina%3BPalomba%2C+Ernesto%3BCapaccioni%2C+Fabrizio%3BCombe%2C+Jean-Philippe%3BTitus%2C+Timothy%3BMittlefehldt%2C+David+W%3BLi%2C+Jian-Yang%3BRussell%2C+Christopher+T%3BAnonymous&rft.aulast=Tosi&rft.aufirst=Federico&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=376&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - albedo; asteroids; Dawn; emissivity; physical properties; temperature; thermal properties; Vesta Asteroid ER - TY - JOUR T1 - A compositional and geological view of fresh ejecta of small impact craters on Asteroid 4 Vesta AN - 1442375304; 2013-079440 AB - Since the arrival of NASA's Dawn spacecraft [1] at Vesta the Visible and InfraRed Imaging Spectrometer (VIR) detects the spectral properties of Vesta's surface between 0.4 and 5 mu m [2, 3]. As part of the analysis of Vesta's surface composition and geology small morphologically fresh impact craters with distinct ejecta blankets offer the possibility to study more or less unweathered surface material. The ejecta appear bright or dark in the visible light with a sharp contrast to the surrounding region. Mostly, the craters themselves are characterized by a similar albedo. Only a few impact craters show bright ejecta and a dark crater floor [4]. In general, bright ejecta exhibit howardite/eucrite-like spectra with relatively deep pyroxene absorptions near 1 and 2 mu m compared to their surroundings. In the case of dark ejecta the pyroxene absorptions are strongly reduced possibly due to the addition of carbonaceous material. Although, the absorption near 2mu m is barely visible at all, the position of the absorption near 1mu m is similar to the position measured for the bright ejecta, which implies no significant changes in the pyroxene composition. Changes in the pyroxene composition indicated by a shift in the band positions could only be identified in the vicinity of one impact crater characterized by bright ejecta and dark crater material, which is directly located at a huge scarp marking the rim of the Rheasilvia impact basin [4]. Both materials show a pronounced pyroxene signature, even if they have different albedos. The bright ejecta show the typical spectral characteristics as mentioned above. The positions of the pyroxene absorptions measured in the crater and slumping material extending from the crater itself, however, occur at shorter wavelength, more characteristic for diogenitic material, and strengthen the thesis that deeper parts of Vesta's subsurface are of more diogenitic composition [4]. We gratefully acknowledge the support of the Dawn Instrument, Operations, and Science Teams and especially T. Roatsch, F. Preusker, J. Sunshine and L. McFadden. References: [1] Russell, C. T et al. (2012) Science, 336. [2] De Sanctis M. C. et al., (2010) Space Sci. Rev. [3] De Sanctis, M. C. et al. (2012) Science, 336. [4] Stephan, K. et al. (2012), ACM, #6300. JF - Abstracts with Programs - Geological Society of America AU - Stephan, Katrin AU - Jaumann, Ralf AU - De Sanctis, Maria Cristina AU - Tosi, Federico AU - Ammannito, Eleonora AU - Matz, Klaus-Dieter AU - Krohn, Katrin AU - Marchi, Simone AU - Raymond, Carol A AU - Russell, Christopher T AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 377 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - albedo KW - surface properties KW - stony meteorites KW - impact features KW - asteroids KW - Vesta Asteroid KW - Rheasilvia Basin KW - diogenite KW - properties KW - ejecta KW - achondrites KW - slumping KW - meteorites KW - mineral composition KW - mass movements KW - composition KW - eucrite KW - impact craters KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442375304?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=A+compositional+and+geological+view+of+fresh+ejecta+of+small+impact+craters+on+Asteroid+4+Vesta&rft.au=Stephan%2C+Katrin%3BJaumann%2C+Ralf%3BDe+Sanctis%2C+Maria+Cristina%3BTosi%2C+Federico%3BAmmannito%2C+Eleonora%3BMatz%2C+Klaus-Dieter%3BKrohn%2C+Katrin%3BMarchi%2C+Simone%3BRaymond%2C+Carol+A%3BRussell%2C+Christopher+T%3BAnonymous&rft.aulast=Stephan&rft.aufirst=Katrin&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=377&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - achondrites; albedo; asteroids; composition; diogenite; ejecta; eucrite; impact craters; impact features; mass movements; meteorites; mineral composition; properties; Rheasilvia Basin; slumping; stony meteorites; surface properties; Vesta Asteroid ER - TY - JOUR T1 - Vesta mineralogy after Dawn global observations AN - 1442375170; 2013-079433 AB - The Dawn mission has completed its mapping phases at Vesta and millions of spectra have been acquired by the Visible and InfraRed Mapping Spectrometer, VIR(1). VIR characterizes and maps the mineral distribution on Vesta--strengthening the Vesta HED linkage--and provides new insights into Vesta's formation and evolution (2,3). VIR spectra are dominated by pyroxene absorptions near 0.9 and 2.0 mu m and large thermal emission beyond 3.5 mu m. Although almost all surface materials exhibit howardite-like spectra, some large regions can be interpreted to be richer in eucritic (basaltic) material and others richer in diogenititic (Mg-orthopyroxenitic) material. The Rheasilvia Basin contains Mg-pyroxene-rich terrains for example. Vesta's surface shows considerable diversity at local scales. Many bright and dark areas (3,4) are associated with various geological features and show remarkably different morphology. Moreover, VIR detected statistically significant, but weak, variations at 2.8 mu m that have been interpreted as indicating the presence of OH-bearing phases on the surface (5). The OH distribution is uneven with large regions lacking this absorption feature. Associations of 2.8 mu m band with morphological structures indicate complex process responsible for OH. Vesta exhibits large spectral variations that often correlate with geological structures, indicating a complex geological and evolutionary history, more similar to that of the terrestrial planets than to other asteroids visited by spacecrafts. This work is supported by an the Italian Space Agency (ASI) grant n degrees I/004/12/0, a DLR grant, and by NASA through the Dawn project and the Dawn at Vesta Participating Scientist grant. Support of the Dawn Instrument, Operations, and Science Teams is grateful acknowledged. References: (1) De Sanctis, M. C. et al., Space Sci. Rev., 2010. (2) Russell, C. T et al., Science, 336, 684 2012. (3) De Sanctis, M. C. et al., Science, 336, 697, 2012 (4) McCord, Nature, submitted (5) De Sanctis, M. C., et al., Science, submitted JF - Abstracts with Programs - Geological Society of America AU - De Sanctis, Maria Cristina AU - Ammannito, Eleonora AU - Capaccioni, Fabrizio AU - Capria, Maria Teresa AU - Frigeri, Alessandro AU - Marchi, Simone AU - Palomba, Ernesto AU - Tosi, Federico AU - Combe, Jean-Philippe AU - Russell, Christopher T AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 375 EP - 376 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - genesis KW - mineral composition KW - asteroids KW - Vesta Asteroid KW - global KW - spectra KW - observations KW - infrared spectra KW - Dawn KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442375170?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Vesta+mineralogy+after+Dawn+global+observations&rft.au=De+Sanctis%2C+Maria+Cristina%3BAmmannito%2C+Eleonora%3BCapaccioni%2C+Fabrizio%3BCapria%2C+Maria+Teresa%3BFrigeri%2C+Alessandro%3BMarchi%2C+Simone%3BPalomba%2C+Ernesto%3BTosi%2C+Federico%3BCombe%2C+Jean-Philippe%3BRussell%2C+Christopher+T%3BAnonymous&rft.aulast=De+Sanctis&rft.aufirst=Maria&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=375&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 5 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - asteroids; Dawn; genesis; global; infrared spectra; mineral composition; observations; spectra; Vesta Asteroid ER - TY - JOUR T1 - Geochemical self-organization and microbially-mediated oxidation of siderite in the Shinarump Member of the Chinle Formation AN - 1442375009; 2013-079363 AB - The Kanab Wonderstone is sandstone (Shinarump member; Chinle Formation) that is variably cemented and stained with iron oxide. Similar features occur in sedimentary rocks all over the world and have been referred to as Liesegang bands. Closer examination reveals that the rocks in each locality are sandstones that host one to 20 mm thick, undulatory bands of iron oxide cement (IOC). The rock between the IOC bands is alternately lightly stained and lacking iron oxide stain (IOS). Both the IOS and IOC crosscut and obscure sedimentary structures. Many of the bands of IOS are arcuate and appear to be truncated by the bands of IOC; mimicking the appearance of cross-stratification. Both the IOC and IOS are related spatially to vertical joints that cut the sandstone at regular intervals. The spacing of bands of IOS is variable but typically follows the Jablczynski spacing law whereas the width of the bands typically increases with distance from a band of IOC. Bands of IOC, on the other hand, exhibit more variable spacing and a weak but significant dependence of band thickness on distance between bands of IOC. The IOS consists of mounds of acicular needles precipitated on quartz grains. The pore-filling IOC comprises both needles and hexagonal plates of iron oxide, but there are also bundles of twisted filaments. At least three filaments occur in each bundle. The bundles are approximately 1 mu m in diameter and 10s of mu m long. The ends of some filaments are anchored to quartz grains. These morphotypes are similar to those exhibited by the microaerophilic iron-oxidizing bacteria Gallionella. We interpret the IOC to be produced by microbially-mediated dissolution of siderite and oxidation of ferrous iron. Iron-oxidizing bacteria colonized the redox interface between siderite-cemented sand and porous sandstone. Microbes oxidized aqueous Fe(II), generating acid that caused siderite dissolution. Bands of IOS largely retain the morphology of reaction fronts, presumably as a result of differential adsorption of aqueous Fe(II) during siderite dissolution. Variations in the width of bands of IOS and in the spacing between these bands is evidence that the IOS is a part of true Liesegang system. The IOC, however, is the product of the geochemical drive for organization combined with microbial activity. JF - Abstracts with Programs - Geological Society of America AU - Kettler, Richard M AU - Loope, David B AU - Niles, Paul B AU - Weber, Karrie A AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 363 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - United States KW - iron oxides KW - Kanab Wonderstone KW - Gallionella KW - sandstone KW - Chinle Formation KW - solution KW - iron KW - sedimentary rocks KW - Western U.S. KW - Triassic KW - oxides KW - Upper Triassic KW - cement KW - geochemistry KW - Eh KW - oxidation KW - Mesozoic KW - ferrous iron KW - siderite KW - precipitation KW - metals KW - bacteria KW - clastic rocks KW - carbonates KW - Shinarump Member KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442375009?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Geochemical+self-organization+and+microbially-mediated+oxidation+of+siderite+in+the+Shinarump+Member+of+the+Chinle+Formation&rft.au=Kettler%2C+Richard+M%3BLoope%2C+David+B%3BNiles%2C+Paul+B%3BWeber%2C+Karrie+A%3BAnonymous&rft.aulast=Kettler&rft.aufirst=Richard&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=363&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - bacteria; carbonates; cement; Chinle Formation; clastic rocks; Eh; ferrous iron; Gallionella; geochemistry; iron; iron oxides; Kanab Wonderstone; Mesozoic; metals; oxidation; oxides; precipitation; sandstone; sedimentary rocks; Shinarump Member; siderite; solution; Triassic; United States; Upper Triassic; Western U.S. ER - TY - JOUR T1 - The geology of the Marcia Quadrangle of Asteroid Vesta; an integrated mapping study using Dawn spacecraft data AN - 1442374834; 2013-079436 AB - We used geologic mapping applied to Dawn data as a tool to understand the geologic history of the Marcia Quadrangle of Vesta. This region hosts a set of relatively fresh craters and surrounding ejecta field, an unusual dark hill named Arisia Tholus, and a orange (false color) diffuse material surrounding the crater Octavia. Stratigraphically, from oldest to youngest, three increasingly larger impact craters named Minucia, Calpurnia, and Marcia make up a snowman-like feature, which is surrounded by a zone of dark material interpreted to consist of impact ejecta and possibly impact melts. The floor of Marcia contains a pitted terrain thought to be related to release of volatiles (1). The dark ejecta field has an enhanced signature of H, possibly derived from carbonaceous chondritic material that accumulated in Vesta's crust (2,3). The dark ejecta has a spectrally distinctive behavior with shallow pyroxenes band depths. Outside the ejecta field this quadrangle contains various cratered terrains, with increasing crater abundance moving south to north away from the Rheasilvia Basin. Arisia Tholus, originally suggested as an ancient volcano, appears to be an impact-sculpted basin rim fragment with a superposed dark-rayed impact crater. There remains no unequivocal evidence of volcanic features on Vesta's surface, likely because basaltic material of the HED meteorite suite demonstrates magmatism ended very early on Vesta (4). Ongoing work includes application of crater statistical techniques to obtain model ages of surface units, and more detailed estimates of the compositional variations among the surface units. Support by J. E. C. Scully, R. A. Yingst, W. B. Garry, T. B. McCord, J. P. Combe, C. M. Pieters, A. Nathues, L. Le Corre, M. Hoffmann, V. Reddy, T. Roatsch, F. Preusker, S. Marchi, G. Neukum, N. Schmedemann, T. Kneissl, H. Hiesinger, A. Frigeri, C. T. Russell, C. A. Raymond, and the Dawn Instrument, Operations, and Science Teams is grateful acknowledged. This work is supported by grants from NASA through the Dawn project and the Dawn at Vesta Participating Scientist Program, and from the German and Italian Space Agencies. References: (1) Denevi, et al., 2012, Science, in revision; (2) Prettyman et al., Science, in revision; (3) McCord, et al., 2012, Nature, in revision; (4) Schiller, et al., 2010, GCA 74, 4844. JF - Abstracts with Programs - Geological Society of America AU - Williams, David A AU - Denevi, Brett W AU - Mittlefehldt, David W AU - Mest, Scott C AU - Schenk, Paul M AU - Jaumann, Ralf AU - De Sanctis, Maria Cristina AU - Ammannito, Eleonora AU - Prettyman, T H AU - Buczkowski, Debra L AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 376 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - Minucia Crater KW - Marcia Quadrangle KW - impact features KW - Calpurnia Crater KW - asteroids KW - Vesta Asteroid KW - Rheasilvia Basin KW - mapping KW - ejecta KW - melts KW - variations KW - volatiles KW - Arisia Tholus KW - mineral composition KW - impact craters KW - Octavia Crater KW - Marcia Crater KW - Dawn KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442374834?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+geology+of+the+Marcia+Quadrangle+of+Asteroid+Vesta%3B+an+integrated+mapping+study+using+Dawn+spacecraft+data&rft.au=Williams%2C+David+A%3BDenevi%2C+Brett+W%3BMittlefehldt%2C+David+W%3BMest%2C+Scott+C%3BSchenk%2C+Paul+M%3BJaumann%2C+Ralf%3BDe+Sanctis%2C+Maria+Cristina%3BAmmannito%2C+Eleonora%3BPrettyman%2C+T+H%3BBuczkowski%2C+Debra+L%3BAnonymous&rft.aulast=Williams&rft.aufirst=David&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=376&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - Number of references - 4 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Arisia Tholus; asteroids; Calpurnia Crater; Dawn; ejecta; impact craters; impact features; mapping; Marcia Crater; Marcia Quadrangle; melts; mineral composition; Minucia Crater; Octavia Crater; Rheasilvia Basin; variations; Vesta Asteroid; volatiles ER - TY - JOUR T1 - Using GRIDVIEW to compare topographic and crustal thickness signatures of large lunar impact basins AN - 1442372767; 2013-081070 AB - The GRIDVIEW computer program has proven to be very useful tool to study the structure of the crust of the Moon and Mars. It was used to map Quasi-Circular Depressions (QCDs) on Mars which represent a very large but buried population of impact craters, and to help identify Circular Thin Areas (CTAs) in model crustal thickness data which indicate the presence of several previously unknown very large impact basins on Mars. More recently GRIDVIEW was used to map QCDs and CTAs for the Moon, which, in combination with the more recent LOLA and LOLA-derived data, indicates a population of impact basins significantly larger than previously thought. Detailed study of these QCDs and CTAs for basins > 300 km in diameter revealed that, for well-known basins, the ring of thickened crust in the CTA signature sometimes was situated well inside the most prominent topographic ring normally taken as the basin diameter. This appears to be especially true of some multi-ring basins but not the case for larger craters 200-300 km in diameter, just below the size cutoff for lunar basins. In order to better understand the relationship between the subsurface crustal structure represented by the model CTA signatures and the surface topographic structure, we began a systematic comparison of the QCD and CTA signatures for basins as a function of diameter, location on the Moon, and multi-ring status. We also noted whether or not mare fill was related to the location of the CTA peak ring compared to the topographic peak ring. These comparisons were done both using the fit-a-ring feature in GRIDVIEW and its profiling tool. We find for basins 1.3. For much larger basins the CTA/QCD diameter approaches 1 again as for the small features. Additional variations appear in our limited preliminary study to depend on the multi-ring nature of basins, but further work is required to understand these trends. JF - Abstracts with Programs - Geological Society of America AU - Jackson, Ryan Steele AU - Frey, Herbert AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 403 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - impact features KW - Moon KW - GRIDVIEW KW - Lunar Reconnaissance Orbiter Altimeter KW - data processing KW - maria KW - lunar craters KW - computer programs KW - topography KW - depressions KW - thickness KW - LOLA KW - impact craters KW - crust KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442372767?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Using+GRIDVIEW+to+compare+topographic+and+crustal+thickness+signatures+of+large+lunar+impact+basins&rft.au=Jackson%2C+Ryan+Steele%3BFrey%2C+Herbert%3BAnonymous&rft.aulast=Jackson&rft.aufirst=Ryan&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=403&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - computer programs; crust; data processing; depressions; GRIDVIEW; impact craters; impact features; LOLA; lunar craters; Lunar Reconnaissance Orbiter Altimeter; maria; Moon; thickness; topography ER - TY - JOUR T1 - GRIDVIEW; a computer program for analyzing planetary gridded data AN - 1442372624; 2013-081071 AB - GRIDVIEW, a product of the Planetary Geodynamics Laboratory at NASA's Goddard Space Flight Center, is a freely available Interactive Data language (IDL) computer program designed to aid researchers in their efforts to study, visualize, measure, and produce graphics of planetary gridded data. It is often used to study gridded topography products from instruments such as the Mars Orbiter Laser Altimeter (MOLA) or the Lunar Orbiter laser Altimeter (LOLA), but also can work well with other gridded data such as magnetic anomaly or gamma ray spectrometry. The application focuses on the visual display of data and includes tools for color adjustments as well as shaded relief that allow users to highlight and enhance areas of interest. The program has many additional features, including measurement and plotting tools that have been successfully used for the mapping of craters and buried basins, as well as the measurement of distance, height, slope, area, and volume of various geomorphological features. For measurement accuracy, diameter constants for the Earth, Mars, and the Moon can be selected or the user can enter an arbitrary value to enable accurate measurement of data from nearly any sized circular body. Other program features include: latitude/longitude/data value tracking, global rotation and zooming, color stretching and contouring, profile plotting, image output, overlay of other data contours, image overlay, advanced area and volume calculation, and an interactive data fly through. Users can load gridded data of various formats into GRIDVIEW, including the Experiment Gridded Data Records (EGDR) ".img" format that NASA's Planetary Data System (PDS) uses to distribute MOLA topographic data, the IDL specific ".sav" format, and the Generic Mapping Tools NetCDF ".grd" format. Users can also load and view JPEG images such as the planetary images that can be created and downloaded from the USGS Map-a-Planet web site. GRIDVIEW is freely available for download at http://geodynamics.gsfc.nasa.gov/gridview and can run on any computer platform supported by IDL or the IDL Virtual Machine, available at http://www.exelisvis.com/. JF - Abstracts with Programs - Geological Society of America AU - Roark, James H, Jr AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 403 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - digital data KW - impact features KW - Moon KW - GRIDVIEW KW - computer languages KW - Lunar Reconnaissance Orbiter Altimeter KW - data processing KW - magnetic anomalies KW - mapping KW - lunar craters KW - measurement KW - computer programs KW - visualization KW - topography KW - LOLA KW - MOLA KW - impact craters KW - accuracy KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442372624?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=GRIDVIEW%3B+a+computer+program+for+analyzing+planetary+gridded+data&rft.au=Roark%2C+James+H%2C+Jr%3BAnonymous&rft.aulast=Roark&rft.aufirst=James&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=403&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - accuracy; computer languages; computer programs; data processing; digital data; GRIDVIEW; impact craters; impact features; LOLA; lunar craters; Lunar Reconnaissance Orbiter Altimeter; magnetic anomalies; mapping; measurement; MOLA; Moon; topography; visualization ER - TY - JOUR T1 - GRIDVIEW image manipulation using LOLA data AN - 1442372365; 2013-081068 AB - GRIDVIEW is an IDL compatible software application designed to aid researchers in their efforts to analyze, measure, and visualize gridded data products such as planetary topography. It is free, easy to use, and is also available for teachers and students to conduct research in the classroom, or by the general public who may be interested in such innovative technology. IDL, short for Interactive Data Language, is a programming language used for data analysis. It is popular in particular areas of science, such as in astronomy imaging. The instrument data is collected in a way very similar to a spreadsheet, with values occurring in a tabular manner. These tabular data are then converted into images based on the values assigned to intensities. For example, we use GRIDVIEW for manipulating images of the topography of the Moon and Mars. The topographical data for Moon that GRIDVIEW works is topographical data collected in values determined by the timing between the pulse and return bounce of laser beams sent to the lunar surface from the Lunar Reconnaissance Orbiter instrument called LOLA (Lunar Reconnaissance Orbiter Altimeter) and returned to the spacecraft. So, simply stated, the IDL program takes data values and, in conjunction with GRIDVIEW, converts the data into a visual image based on the data. Once an image is created with the IDL software, GRIDVIEW allows you to manipulate parameters to zoom in, zoom out, crop, and change layers in the images created. There are many other options for manipulating the images in GRIDVIEW to enhance research initiatives in geomorphology of the Moon and Mars. The free IDL data in association with GRIDVIEW is currently available for Moon and Mars only. JF - Abstracts with Programs - Geological Society of America AU - Millham, Rosemary A AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 402 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - digital data KW - imagery KW - Moon KW - GRIDVIEW KW - computer languages KW - spreadsheets KW - data processing KW - Mars KW - measurement KW - terrestrial planets KW - computer programs KW - visualization KW - planets KW - topography KW - LOLA KW - Lunar Reconaissance Orbiter Altimeter KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442372365?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=GRIDVIEW+image+manipulation+using+LOLA+data&rft.au=Millham%2C+Rosemary+A%3BAnonymous&rft.aulast=Millham&rft.aufirst=Rosemary&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=402&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - computer languages; computer programs; data processing; digital data; GRIDVIEW; imagery; LOLA; Lunar Reconaissance Orbiter Altimeter; Mars; measurement; Moon; planets; spreadsheets; terrestrial planets; topography; visualization ER - TY - JOUR T1 - Using GRIDVIEW to better understand the early bombardment history of the Moon, Mars and Earth AN - 1442372073; 2013-081069 AB - For more than a decade we have used GRIDVIEW to help analyze topographic and related data for Mars and more recently for the Moon. Our focus has been to employ the stretching, contouring, profiling, circle-fitting and other capabilities of GRIDVIEW to search for Quasi-Circular Depressions (CTAs) in MOLA, LOLA and other topographic data, and for Circular Thin Areas (CTAs) in Mars and Moon model crustal thickness data. Both QCDs and CTAs likely represent buried or obscured impact craters not readily visible in image data. We found clear evidence for a much larger population of buried impact craters in the northern lowlands of Mars (Frey et al. 2002), suggesting that part of the Red Planet is not significantly younger than the southern highlands. Edgar and Frey (2008) found that the N(300) crater retention ages of both areas were essentially identical, a conclusion confirmed by Wyatt (unpublished data) using more recent crustal thickness data for Mars. MOLA topographic data and MOLA-derived crustal thickness data were used to both identify a large number of previously unrecognized very large impact basins (D> 1000 km) on Mars and to determine relative crater retention ages for them (Frey, 2008). The distribution of N(300) CRAs suggested most formed in a relatively short interval of time. This dating also suggested the main magnetic field of Mars disappeared during this period (Lillis et al., 2008), because only the youngest basins systematically lack a remagnetized signature. Similar QCD and CTA analysis of first Clementine (Frey, 2011) and more recently LOLA topographic and LOLA-derived crustal thickness data for the Moon (Frey et al., 2011) revealed a significantly larger population of impact basins > 300 km in diameter than previously known. N(50) CRAs suggest a two-peak distribution of ages (Frey, 2012). An improved counting process confirms the two peaks, perhaps indicating both a pre-Nectaris Early Heavy Bombardment (EHB) as well as a Late Heavy Bombardment (LHB) on the Moon (Frey and Burgess, 2012, this meeting), with obvious implications for the early bombardment history of the Earth. JF - Abstracts with Programs - Geological Society of America AU - Frey, Herbert AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 402 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - Earth KW - impact features KW - Moon KW - GRIDVIEW KW - data processing KW - Mars KW - impacts KW - lunar craters KW - terrestrial planets KW - models KW - computer programs KW - planets KW - topography KW - thickness KW - impact craters KW - crust KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1442372073?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Using+GRIDVIEW+to+better+understand+the+early+bombardment+history+of+the+Moon%2C+Mars+and+Earth&rft.au=Frey%2C+Herbert%3BAnonymous&rft.aulast=Frey&rft.aufirst=Herbert&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=402&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - computer programs; crust; data processing; Earth; GRIDVIEW; impact craters; impact features; impacts; lunar craters; Mars; models; Moon; planets; terrestrial planets; thickness; topography ER - TY - JOUR T1 - Accelerating sea level rise and stakeholder response AN - 1438970539; 2013-077221 AB - The region between Cape Hatteras and Cape Cod is experiencing accelerating sea level rise. This paper will discuss the evidence for and predictions of sea level rise followed by the needs of stakeholders such as regional planners and civil engineers. Sallenger, Doran and Howd (2012) and Ezer and Corlett (personal communication) have shown strong evidence for the acceleration of sea level rise in the 0.05-0.1 mm y (super -2) range rather than a simple linear increase. They attribute this to changes in the dynamic sea level rise component such as wind field and North Atlantic Ocean dynamic features such as the Gulf Stream (Ezer, 2001). Sweet, Zervas and Gill (2009) attributed the anomalously high sea level along the mid-Atlantic in 2009 to dynamic SLR. These accelerations suggest that the higher estimates of SLR in IPCC reports may be better estimates. Even if the strength and frequency of storms remains steady, rising sea level will result in increased damage. We will give several examples of how stakeholders are dealing with increased flooding risk due to sea level rise: cities, NASA facilities, and shipyards. Regional planners and engineers require estimates of local sea level out 50 to 100 years as that is the lifetime of coastal infrastructure: docks, piers, levees, etc.. They also require error bars on these estimates. Studies of dynamic SLR are required to provide this information. Emergency managers also need short term predictions of flooding risk. In 2009 sea level along the Northeast U.S. coastline remained around 0.3 m above predicted for months. Rising sea level will acerbate the effects of these short term fluctuations. Predicting such shorter term variations in sea level just as we observe and predict the ENSO cycle may become necessary for disaster preparation. Finally we will discuss how flood insurance rates are subsidized and do not reflect the true risk of coastal flooding and do not incorporate the likelihood of future sea-level rise. JF - Abstracts with Programs - Geological Society of America AU - Atkinson, Larry P AU - Ezer, Tal AU - DeYoung, Russell AU - McShane, Michael AU - McFarlane, Benjamin AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 360 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - United States KW - preparation KW - geologic hazards KW - prediction KW - rates KW - docks KW - levees KW - fluctuations KW - sea-level changes KW - El Nino Southern Oscillation KW - transgression KW - piers KW - planning KW - natural hazards KW - floods KW - risk assessment KW - Atlantic Coastal Plain KW - 30:Engineering geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1438970539?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Accelerating+sea+level+rise+and+stakeholder+response&rft.au=Atkinson%2C+Larry+P%3BEzer%2C+Tal%3BDeYoung%2C+Russell%3BMcShane%2C+Michael%3BMcFarlane%2C+Benjamin%3BAnonymous&rft.aulast=Atkinson&rft.aufirst=Larry&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=360&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-03 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Atlantic Coastal Plain; docks; El Nino Southern Oscillation; floods; fluctuations; geologic hazards; levees; natural hazards; piers; planning; prediction; preparation; rates; risk assessment; sea-level changes; transgression; United States ER - TY - JOUR T1 - Hematite bearing ridge as evidence for anoxic water discharge in Gale Crater AN - 1434008357; 2013-072032 AB - Mars Reconnaissance Orbiter CRISM hyperspectral imaging data covering Mount Sharp's northern flank and acquired with pixels spatially oversampled have been processed to retrieve high signal to noise single scattering albedo spectra from 0.45 to 2.6 mu m. The spectral characteristics of a approximately 200 m wide and 6.5 km long ridge at the northern end of a large channel system emanating from Mount Sharp were examined using this data. The ridge is composed of finely layered strata dipping to the north and exhibits a strong spectral signature of crystalline hematite. To the west, the ridge transitions to an escarpment overlain by younger strata and occasionally exposed through erosional windows; to the east, debris flows from Mount Sharp cover and obscure the ridge. The ridge is stratigraphically directly above the clay bearing strata. We interpret the ridge to be formed by erosion associated with outflow from the channel that preferentially stripped away flanking strata that were not as well cemented by hematite. We hypothesize that the hematite accumulated where anoxic groundwater discharged and came into contact with an oxidizing Martian atmosphere. Anoxic water may have originated as precipitation that percolated through the mound, leaching Fe (super 2+) from the overlying sulfate layers until encountering the clay acquiclude. Alternatively, anoxic Fe (super 2+) -rich waters at Gale could have originated by groundwater discharge near the base of the mound. In this scenario, dissolved Fe (super 2+) could be leached from an underlying basaltic aquifer or possibly the clay layer. Given that iron oxidation reactions on Earth may be mediated by chemolithotrophic microorganisms, the ridge provides a compelling site for a detailed measurement campaign by the Mars Science Laboratory Curiosity rover. JF - Abstracts with Programs - Geological Society of America AU - Fraeman, Abigail A AU - Arvidson, Raymond E AU - Catalano, Jeffrey G AU - Morris, Richard V AU - Murchie, Scott L AU - Seelos, Frank P AU - Seelos, Kimberly D AU - McGovern, J Andy AU - Viviano, Christina AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 189 EP - 190 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - terrestrial planets KW - planets KW - hematite KW - oxides KW - Mars KW - Mars Orbiter Camera KW - discharge KW - Mount Sharp KW - Gale Crater KW - exploration KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434008357?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Hematite+bearing+ridge+as+evidence+for+anoxic+water+discharge+in+Gale+Crater&rft.au=Fraeman%2C+Abigail+A%3BArvidson%2C+Raymond+E%3BCatalano%2C+Jeffrey+G%3BMorris%2C+Richard+V%3BMurchie%2C+Scott+L%3BSeelos%2C+Frank+P%3BSeelos%2C+Kimberly+D%3BMcGovern%2C+J+Andy%3BViviano%2C+Christina%3BAnonymous&rft.aulast=Fraeman&rft.aufirst=Abigail&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=189&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-09-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - discharge; exploration; Gale Crater; hematite; Mars; Mars Orbiter Camera; Mount Sharp; oxides; planets; terrestrial planets ER - TY - JOUR T1 - Evidence for lacustrine carbonates and clays within McLaughlin Crater, Mars AN - 1434007577; 2013-071917 AB - McLaughlin Crater is a large ( approximately 90 km diameter), ancient (> 3.7 Ga), deep ( approximately 2.5 km) impact crater on Mars. Along the eastern interior wall of the crater are a number of channels that terminate at an elevation approximately 500 meters above the modern crater floor. This observation could suggest the presence of a former base level at the surface of lake that once filled the crater. Also along the east interior of the crater is a broad terrace that might have formed from deposition of fluvial sediment into standing water. Within the floor of the crater are layered sediments that contain spectroscopic features similar to Mg-rich carbonates and Fe-Mg-rich clay minerals. In addition, impact ejecta from a younger, nearby crater (Keren Crater) deposited into Mclaughlin appears to have flow-like morphologies that are consistent with deposition in a wet environment. In fact, a number of possible debris flow units are present on the floor of McLaughlin. Finally, Keren's ejecta are not altered where they are found outside of McLaughlin (based on thermal infrared spectroscopy), but are altered within the basin, below the proposed base level. Taken together, these observations point to the former presence of a lacustrine environment within McLaughlin Crater, which may have experienced episodes of rapid deposition that would be advantageous for the preservation of organic matter if any was present at the time. The source of the water within the crater could have been groundwater from the deep crust. McLaughlin Crater is among the most likely places to find evidence for groundwater-fed springs because the crater is deep and it occurs adjacent to the global topographic dichotomy boundary. The neutral-to-alkaline, Mg-Fe-rich fluids implicated by the mineralogy of putative lacustrine sediments are consistent with predicted fluid chemistry from groundwater that evolved in a basaltic crust. This site could provide access for exploration of a possible ancient, deep martian biosphere. JF - Abstracts with Programs - Geological Society of America AU - Michalski, Joseph AU - Rogers, A Deanne AU - Wright, Shawn AU - Niles, Paul B AU - Cuadros, J AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 168 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - clay KW - clastic sediments KW - sedimentation KW - Mars KW - terrestrial planets KW - planets KW - sedimentary rocks KW - McLaughlin Crater KW - sediments KW - carbonate rocks KW - geochemistry KW - lacustrine sedimentation KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1434007577?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Evidence+for+lacustrine+carbonates+and+clays+within+McLaughlin+Crater%2C+Mars&rft.au=Michalski%2C+Joseph%3BRogers%2C+A+Deanne%3BWright%2C+Shawn%3BNiles%2C+Paul+B%3BCuadros%2C+J%3BAnonymous&rft.aulast=Michalski&rft.aufirst=Joseph&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=168&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-09-20 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - carbonate rocks; clastic sediments; clay; geochemistry; lacustrine sedimentation; Mars; McLaughlin Crater; planets; sedimentary rocks; sedimentation; sediments; terrestrial planets ER - TY - JOUR T1 - The contribution of groundwater depletion to global mean sea level rise AN - 1420504569; 2013-062863 AB - The contribution of groundwater depletion to Global Mean Sea Level Rise (GMSLR) is an important topic and source of great uncertainty in the GMSLR budget. This research uses gridded GRACE Tellus satellite data to quantify changes in total land water storage, including those of groundwater. Global Land Data Assimilation System land components such as soil moisture, canopy moisture, and snow, are subtracted from the GRACE data to isolate the groundwater component. The resulting trends show that most continents are gaining in groundwater storage, which is consistent with GRACE-based estimates of zero-to-increasing changes in total land water. Results indicate a negative contribution to current rates of GMSLR for the GRACE time period, which is in contrast to the long term, positive contribution identified in recent studies. JF - Abstracts with Programs - Geological Society of America AU - Famiglietti, James AU - Lambinicio, Amabella AU - An, Karen AU - Reager, J T AU - Druffel-Rodriguez, Rachel AU - Richey, Alexandra AU - Rodell, Matthew AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 54 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - hydrology KW - sea-level changes KW - transgression KW - global KW - GRACE KW - satellite methods KW - climate change KW - ground water KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1420504569?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=The+contribution+of+groundwater+depletion+to+global+mean+sea+level+rise&rft.au=Famiglietti%2C+James%3BLambinicio%2C+Amabella%3BAn%2C+Karen%3BReager%2C+J+T%3BDruffel-Rodriguez%2C+Rachel%3BRichey%2C+Alexandra%3BRodell%2C+Matthew%3BAnonymous&rft.aulast=Famiglietti&rft.aufirst=James&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=54&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-08-15 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - climate change; global; GRACE; ground water; hydrology; satellite methods; sea-level changes; transgression ER - TY - JOUR T1 - Return to tyre; heat flow estimates from multiring impact graben on Europa and elsewhere AN - 1420503067; 2013-062929 AB - The collapse of large transient impact cavities may lead to the creation of one or more exterior rings. The existence and extent of such ring systems depend on the thickness of the mechanical lithosphere at the time and place of impact. Icy satellites offer a valuable laboratory to explore this paradigm, and Ron Greeley took particular interest in these as part of his work on the Galileo imaging team, which we extend here. The two largest impact structures on Europa are Tyre ( nearly equal 160 km across) and Callanish ( nearly equal 95 km across). Tyre and Callanish both possess compact systems of circumferential graben-like troughs, essentially miniature versions of the much larger Valhalla and Asgard/Utgard multiringed structures on Callisto, and plausibly related to the hemispherical-scale furrow systems on Ganymede. The compact nature of these structures implies a relatively thin icy lithosphere, consistent with present-day steep temperature gradients due to strong tidal heating. We use measurements of trough width (and depth) to constrain heat flows at the time of impact. Assuming the troughs are graben, and that they originated or nucleated at the brittle-ductile transition (BDT), we find that fault intersection depths are equal to graben width (to within 10%). The depth to the BDT is related to the surface heat flux through the temperature profile in the ice shell and the rheology of water ice. The BDT occurs at a depth and temperature where the differential stress required for ductile flow at a given strain rate is equal to brittle yield stress. For the high strain rates appropriate to post-impact crater collapse, we find anomalously high heat flows, >300 mW m (super -2) . If, however, the "hourglass" model of graben formation is more correct than the classic "keystone" model (R.A. Schultz et al., in The Geology of Mars, 2007), then our BDT depths are underestimates. Furthermore, preexisting fractures imply lower thermal conductivity for lithospheric ice, and the combination implies true heat flows closer to 100 mW m (super -2) , similar to other literature estimates. Conductivity remains a principal uncertainty, but one amenable to future observational constraints, especially through an active remote sensing technique such as ice-penetrating radar. JF - Abstracts with Programs - Geological Society of America AU - McKinnon, William B AU - Schenk, Paul M AU - Singer, K N AU - Moore, Jeffrey AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 65 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - systems KW - icy satellites KW - technology KW - Europa Satellite KW - stress KW - radar methods KW - Mars KW - Galilean satellites KW - grabens KW - terrestrial planets KW - planets KW - rheology KW - heat flow KW - satellites KW - faults KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1420503067?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Return+to+tyre%3B+heat+flow+estimates+from+multiring+impact+graben+on+Europa+and+elsewhere&rft.au=McKinnon%2C+William+B%3BSchenk%2C+Paul+M%3BSinger%2C+K+N%3BMoore%2C+Jeffrey%3BAnonymous&rft.aulast=McKinnon&rft.aufirst=William&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=65&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-08-15 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Europa Satellite; faults; Galilean satellites; grabens; heat flow; icy satellites; Mars; planets; radar methods; rheology; satellites; stress; systems; technology; terrestrial planets ER - TY - JOUR T1 - Surface textures and features indicative of endogenous growth at the McCartys flow field, NM, as an analog to Martian volcanic plains AN - 1420502782; 2013-062926 AB - Basaltic lavas typically form channels or tubes, which are recognized on the Earth and Mars. Although largely unrecognized in the planetary community, terrestrial inflated sheet flows also display morphologies that share many commonalities with lava plains on Mars. The McCartys lava flow field is among the youngest ( approximately 3000 yrs) basaltic flows in the continental United States. The southwest sections of the flow displays smooth, flat-topped plateaus with irregularly shaped pits and hummocky inter-plateau units that form a polygonal surface. Plateaus are typically elongate in map view, up to 20 m high and display lineations within the glassy crust. Lineated surfaces occasionally display small < 1 m diameter lava coils. Lineations are generally straight and parallel each other, sometimes for over 100 meters. The boundaries between plateaus and depressions are also lineated and tilted to angles sometimes approaching vertical. Plateau-parallel cracks, sometimes containing squeeze-ups, mark the boundary between tilted crust and plateau. Some plateau depressions display level floors with hummocky surfaces, while some are bowl shaped with floors covered in broken lava slabs. The lower walls of pits sometimes display lateral, sagged lava wedges. Infrequently, pit floors display the upper portion of a tumulus from an older flow. In some places the surface crust has been disrupted forming a slabby texture. Slabs are typically on the scale of a meter or less across and no less than 7-10 cm thick. The slabs preserve the lineated textures of the undisturbed plateau crust. It appears that this style of terrain represents the emplacement of an extensive sheet that experiences inflation episodes within preferred regions where lateral spreading of the sheet is inhibited, thereby forming plateaus. Rough surfaces represent inflation-related disruption of pahoehoe lava and not a'a lava. Depressions are often the result of non-inflation and can be clearly identified by lateral squeeze-outs along the pit walls that form when the rising crust exposes the still liquid core of the sheet. The plains of Tharsis and Elysium, Mars, display many analogous features. JF - Abstracts with Programs - Geological Society of America AU - Bleacher, Jacob E AU - Crumpler, Larry S AU - Zimbelman, James R AU - Garry, W Brent AU - Self, Stephen AU - Aubele, Jayne C AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 65 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - United States KW - terrestrial planets KW - planets KW - lava flows KW - volcanism KW - Elysium KW - natural analogs KW - Mars KW - New Mexico KW - Tharsis KW - McCartys lava field KW - 04:Extraterrestrial geology KW - 05A:Igneous and metamorphic petrology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1420502782?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Surface+textures+and+features+indicative+of+endogenous+growth+at+the+McCartys+flow+field%2C+NM%2C+as+an+analog+to+Martian+volcanic+plains&rft.au=Bleacher%2C+Jacob+E%3BCrumpler%2C+Larry+S%3BZimbelman%2C+James+R%3BGarry%2C+W+Brent%3BSelf%2C+Stephen%3BAubele%2C+Jayne+C%3BAnonymous&rft.aulast=Bleacher&rft.aufirst=Jacob&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=65&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-10-17 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Elysium; lava flows; Mars; McCartys lava field; natural analogs; New Mexico; planets; terrestrial planets; Tharsis; United States; volcanism ER - TY - JOUR T1 - Structural Health Monitoring and Risk Management of a Reusable Launch Vehicle AN - 1412503345; 18207392 AB - A structural-health-monitoring system can contribute to the risk management of a structure operating under hazardous conditions. An example is the wing leading-edge impact-detection system that monitors the debris hazards to the Space Shuttle Orbiter's reinforced carbon-carbon panels. Since return to flight after the Columbia accident, the system was developed and subsequently deployed on board the orbiter to detect ascent and on-orbit debris impacts, so as to support the assessment of wing leading edge structural integrity before orbiter reentry. As structural health monitoring is inherently an inverse problem, the analyses involved, including those performed for this system, tend to be associated with significant uncertainty. The use of probabilistic approaches to handle the uncertainty has resulted in the successful implementation of many development and application milestones. JF - Journal of Spacecraft and Rockets AU - Yap, Keng C AU - Macias, Jesus AU - Kaouk, Mohamed AU - Gafka, Tammy L AU - Kerr, Justin H AD - Project Principal Investigator, Loads & Dynamics, Boeing Defense, Space & Security, Tammy.L.Gafka@NASA.com Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 1099 EP - 1108 PB - American Institute of Aeronautics and Astronautics, The Aerospace Center, 370 L'Enfant Promenade, SW Washington DC 20024 United States VL - 49 IS - 6 SN - 0022-4650, 0022-4650 KW - Risk Abstracts; Health & Safety Science Abstracts KW - Risk management KW - Accidents KW - Conferences KW - Space shuttle KW - Spacecraft KW - H 2000:Transportation KW - R2 23070:Economics, organization UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1412503345?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=Journal+of+Spacecraft+and+Rockets&rft.atitle=Structural+Health+Monitoring+and+Risk+Management+of+a+Reusable+Launch+Vehicle&rft.au=Yap%2C+Keng+C%3BMacias%2C+Jesus%3BKaouk%2C+Mohamed%3BGafka%2C+Tammy+L%3BKerr%2C+Justin+H&rft.aulast=Yap&rft.aufirst=Keng&rft.date=2012-11-01&rft.volume=49&rft.issue=6&rft.spage=1099&rft.isbn=&rft.btitle=&rft.title=Journal+of+Spacecraft+and+Rockets&rft.issn=00224650&rft_id=info:doi/10.2514%2F1.A32156 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-07-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Risk management; Accidents; Conferences; Spacecraft; Space shuttle DO - http://dx.doi.org/10.2514/1.A32156 ER - TY - JOUR T1 - Discovery of a plains caldera complex and extinct lava lake in Arabia Terra, Mars; implications for the discovery of additional highland volcanic source regions AN - 1366816553; 2013-047203 AB - Several irregularly shaped topographic depressions occur near the dichotomy boundary in northern Arabia Terra, Mars. The geomorphology of these features suggests that they formed by collapse, opposed to meteor impact. At least one depression ( approximately 55 by 85 km) displays geologic features indicating a complex, multi-stage collapse history. Features within and around the collapse structure indicate volcanic processes. The complex occurs within Hesperian ridged plains of likely volcanic origin and displays no crater rim or evidence for ejecta. Instead the depression consists of a series of circumferential graben and down-dropped blocks which also display upper surfaces similar to ridged plain lavas. Large blocks within the depression are tilted towards the crater center, and display graben that appear to have originally been linked with circumferential graben outside of the complex related to earlier collapse events. A nearly 700 m high mound exists along a graben within the complex that might be a vent. The deepest depression displays two sets of nearly continuous terraces, which we interpret as high-stands of a drained lava lake. These features appear similar to the "black ledge" described during the Mauna Iki eruption in 1959. A lacustrine origin for the terraces seems unlikely because of the paucity of channels found in or around the depression that could be linked to aqueous surface processes. In addition, there is no obvious evidence for lacustrine sediments within the basin. Together with the presence of significant faulting that is indicative of collapse we conclude that this crater complex represents a large caldera formed in the Late Noachian to Early Hesperian. Other linear and irregular depressions in the region also might be linked to ancient volcanism. If that hypothesis is correct, it suggests that northern Arabia Terra could contain a large, previously unrecognized highland igneous province. Evacuation of magma via explosive and effusive activity produced localized collapse, might have contributed to nearby ridged plains, and pyroclastic materials erupted from these vents might have supplied sediments in fretted terrain and other deposits. The recognition of volcanoes within Arabia Terra expands the known extent of Noachian-Hesperian volcanism to cover much of the preserved martian highland crust. JF - Abstracts with Programs - Geological Society of America AU - Bleacher, Jacob E AU - Michalski, Joseph AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 126 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - terrestrial planets KW - calderas KW - planets KW - volcanic features KW - Noachian KW - sediments KW - lacustrine environment KW - volcanoes KW - Mars KW - Arabia Terra KW - exploration KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1366816553?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Discovery+of+a+plains+caldera+complex+and+extinct+lava+lake+in+Arabia+Terra%2C+Mars%3B+implications+for+the+discovery+of+additional+highland+volcanic+source+regions&rft.au=Sittler%2C+E+C%3BCooper%2C+J+F%3BAnonymous&rft.aulast=Sittler&rft.aufirst=E&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-06-13 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Arabia Terra; calderas; exploration; lacustrine environment; Mars; Noachian; planets; sediments; terrestrial planets; volcanic features; volcanoes ER - TY - JOUR T1 - Ping instrument gamma-ray data analysis of planetary analogs AN - 1366816501; 2013-047201 AB - The Probing In situ with Neutrons and Gamma rays (PING) instrument is capable of performing detailed bulk geochemical analysis in situ 30-50 cm into the subsurface of planetary bodies without the need to take a soil sample. Neutrons emitted by the pulsed neutron generator (PNG) interact with the nuclei in the soil, causing the nuclei to emit gamma rays whose energies are specific to the nuclei that emitted them. These gamma rays are detected and their rate and energy are measured by a gamma-ray spectrometer. Numerical gamma-ray data returned by PING are summed and made into a graphical representation of the spectrum as energy vs. gamma-ray count using Igor Pro 6. The data are then run through custom software procedures that allow for easy calibration and spectral analysis. Each energy peak in the gamma-ray spectra represents the presence of a unique isotope while the area underneath each peak represents the gamma-ray count rate, which can be converted to a weight percent of that isotope in the material. Various configurations using Columbia River Basalt, Concord Gray Granite, and polyethylene plates are used as planetary analogs in experiments designed to test PING. The gamma-ray spectra corresponding to these experiments are analyzed by finding the locations of the energy peaks and determining their area by using peak-fitting methods in Igor Pro 6. In this analysis, advanced error reduction methods are applied in order to retrieve the most accurate data possible from each peak in the spectra. Future work includes comparison to chemical assays of the analogs, which will be performed by other members of the group. JF - Abstracts with Programs - Geological Society of America AU - Keske, Amber AU - Parsons, Ann AU - Bodnarik, Julia AU - Schweitzer, Jeff AU - Starr, Richard AU - Evans, Larry AU - Anonymous Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 125 PB - Geological Society of America (GSA), Boulder, CO VL - 44 IS - 7 SN - 0016-7592, 0016-7592 KW - technology KW - gamma-ray methods KW - Columbia River Basalt Group KW - Miocene KW - Cenozoic KW - Tertiary KW - neutrons KW - Neogene KW - Concord Gray Granite KW - terrestrial comparison KW - chemical composition KW - geochemistry KW - instruments KW - 02C:Geochemistry of rocks, soils, and sediments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1366816501?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Abstracts+with+Programs+-+Geological+Society+of+America&rft.atitle=Ping+instrument+gamma-ray+data+analysis+of+planetary+analogs&rft.au=Keske%2C+Amber%3BParsons%2C+Ann%3BBodnarik%2C+Julia%3BSchweitzer%2C+Jeff%3BStarr%2C+Richard%3BEvans%2C+Larry%3BAnonymous&rft.aulast=Keske&rft.aufirst=Amber&rft.date=2012-11-01&rft.volume=44&rft.issue=7&rft.spage=125&rft.isbn=&rft.btitle=&rft.title=Abstracts+with+Programs+-+Geological+Society+of+America&rft.issn=00167592&rft_id=info:doi/ LA - English DB - GeoRef N1 - Conference title - Geological Society of America, 2012 annual meeting N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2013-01-01 N1 - PubXState - CO N1 - Last updated - 2013-06-13 N1 - CODEN - GAAPBC N1 - SubjectsTermNotLitGenreText - Cenozoic; chemical composition; Columbia River Basalt Group; Concord Gray Granite; gamma-ray methods; geochemistry; instruments; Miocene; Neogene; neutrons; technology; terrestrial comparison; Tertiary ER - TY - JOUR T1 - Particle Shape In Simulants of the Lunar Regolith AN - 1318695601; 17790313 AB - Shape is an important property of lunar regolith particles. It substantially affects the regolith's strength, the angle of repose, the packing density, and the ability of regolith particles to attach to and abrade spacecraft materials or clog air filters. For these reasons, simulants are needed to reproduce regolith particle shapes for testing spacecraft that interacts with the lunar surface. Difficulties in assessing "how good" a simulant reproduces the shape of lunar particles stem from the lack of shape measurements obtained on lunar particles, compounded by the lack of a strict definition of shape or a way to quantifiably measure shape. This paper presents a general method for measuring and comparing particle shapes, and provides shape measurements for six lunar-regolith simulants. The method of evaluating particle shape presented here involves Fine Particle Analysis and corresponding image analysis to extract the maximum Feret diameter, Feret diameter of the minor axis of the inertial ellipse, mean diameter, sieve diameter, area, and perimeter length from images with an approximately 4.4 mu m pixel resolution. From those, aspect ratio and Heywood factor are computed. Data processing involves calculating the frequency distributions of particle shapes according to their sieve diameter, aspect ratio, and Heywood factor. The resulting graphical representations indicate that the majority of the lunar regolith simulant particles, in two-dimensional projection, can be well represented by a mixture of ellipses and rectangles of varying aspect ratios. The differences between simulant particle shapes, and lunar regolith particle shapes measured in the future, can be quantified by differencing the accumulated distributions. Thus, this paper presents a new method of particle shape analysis and a new way to quantifiably compare particle shapes. JF - Journal of Sedimentary Research AU - Rickman, D AU - Immer, C AU - Metzger, P AU - Dixon, E AU - Pendleton, M AU - Edmunson, J AD - Earth Science Office, National Aeronautics and Space Administration, Marshall Space Flight Center, Alabama 35812, USA Y1 - 2012/11// PY - 2012 DA - November 2012 SP - 823 EP - 832 VL - 82 IS - 11 SN - 1527-1404, 1527-1404 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Data processing KW - Lunar surface KW - Density KW - Particle Shape KW - Sediments KW - Methodology KW - Filters KW - Frequency Distribution KW - Strength KW - Lunar regolith KW - Sieves KW - Wells KW - Particle analysis KW - Data Processing KW - M2 523.3:Earth-Moon System (523.3) KW - Q2 09264:Sediments and sedimentation KW - SW 0810:General UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1318695601?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Sedimentary+Research&rft.atitle=Particle+Shape+In+Simulants+of+the+Lunar+Regolith&rft.au=Rickman%2C+D%3BImmer%2C+C%3BMetzger%2C+P%3BDixon%2C+E%3BPendleton%2C+M%3BEdmunson%2C+J&rft.aulast=Rickman&rft.aufirst=D&rft.date=2012-11-01&rft.volume=82&rft.issue=11&rft.spage=823&rft.isbn=&rft.btitle=&rft.title=Journal+of+Sedimentary+Research&rft.issn=15271404&rft_id=info:doi/10.2110%2Fjsr.2012.69 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-03-01 N1 - Last updated - 2016-12-22 N1 - SubjectsTermNotLitGenreText - Data processing; Sediments; Methodology; Lunar regolith; Lunar surface; Particle analysis; Filters; Frequency Distribution; Strength; Density; Wells; Sieves; Particle Shape; Data Processing DO - http://dx.doi.org/10.2110/jsr.2012.69 ER - TY - JOUR T1 - NASA Human Research Program Summaries: Crew Autonomy for Future Exploration Spaceflight AN - 1257747579; 17431411 AB - For over half a century, behavioral professionals have studied crew responses to the stresses imposed by spaceflight missions orbiting Earth and visiting our nearby Moon. The stresses and conditions in future exploration missions, however, will include limited ability to return to Earth and limited-if any-resupply, time lags of 40 min in two-way communications with Earth, and other unknown dangers; and home Earth will be a speck in the sky. Planning for these missions will require complex decision-making regarding many aspects of crew behavior and performance including the appropriate/optimal amount of autonomy crewmembers will require to develop effective schedules and strategies for work and recreation and to deal successfully with unanticipated situations. The two research projects presented here address these important issues. JF - Aviation, Space, and Environmental Medicine AU - Frey, M A AD - NASA's Human Research Program Office Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 1102 EP - 1103 PB - Aerospace Medical Association, 320 S. Henry St. Alexandria VA 22314-3579 United States VL - 83 IS - 11 SN - 0095-6562, 0095-6562 KW - Health & Safety Science Abstracts KW - Communications KW - Stress KW - Research programs KW - H 2000:Transportation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1257747579?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthsafetyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.atitle=NASA+Human+Research+Program+Summaries%3A+Crew+Autonomy+for+Future+Exploration+Spaceflight&rft.au=Frey%2C+M+A&rft.aulast=Frey&rft.aufirst=M&rft.date=2012-11-01&rft.volume=83&rft.issue=11&rft.spage=1102&rft.isbn=&rft.btitle=&rft.title=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.issn=00956562&rft_id=info:doi/10.3357%2FASEM.3335.2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-12-01 N1 - Number of references - 3 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Communications; Stress; Research programs DO - http://dx.doi.org/10.3357/ASEM.3335.2012 ER - TY - JOUR T1 - Dark material on Vesta from the infall of carbonaceous volatile-rich material AN - 1244682873; 2013-007454 JF - Nature (London) AU - McCord, T B AU - Li, J Y AU - Combe, J P AU - McSween, H Y AU - Jaumann, R AU - Reddy, V AU - Tosi, F AU - Williams, D A AU - Blewett, D T AU - Turrini, D AU - Palomba, E AU - Pieters, C M AU - De Sanctis, M C AU - Ammannito, E AU - Capria, M T AU - Le Corre, L AU - Longobardo, A AU - Nathues, A AU - Mittlefehldt, D W AU - Schroeder, S E AU - Hiesinger, H AU - Beck, A W AU - Capaccioni, F AU - Carsenty, U AU - Keller, H U AU - Denevi, B W AU - Sunshine, J M AU - Raymond, C A AU - Russell, C T Y1 - 2012/11/01/ PY - 2012 DA - 2012 Nov 01 SP - 83 EP - 86 PB - Macmillan Journals, London VL - 491 IS - 7422 SN - 0028-0836, 0028-0836 KW - carbonaceous composition KW - albedo KW - dark material KW - imagery KW - stony meteorites KW - asteroids KW - Vesta Asteroid KW - parent bodies KW - HED meteorites KW - achondrites KW - meteorites KW - volatiles KW - photometry KW - mineral composition KW - carbon KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244682873?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+%28London%29&rft.atitle=Dark+material+on+Vesta+from+the+infall+of+carbonaceous+volatile-rich+material&rft.au=McCord%2C+T+B%3BLi%2C+J+Y%3BCombe%2C+J+P%3BMcSween%2C+H+Y%3BJaumann%2C+R%3BReddy%2C+V%3BTosi%2C+F%3BWilliams%2C+D+A%3BBlewett%2C+D+T%3BTurrini%2C+D%3BPalomba%2C+E%3BPieters%2C+C+M%3BDe+Sanctis%2C+M+C%3BAmmannito%2C+E%3BCapria%2C+M+T%3BLe+Corre%2C+L%3BLongobardo%2C+A%3BNathues%2C+A%3BMittlefehldt%2C+D+W%3BSchroeder%2C+S+E%3BHiesinger%2C+H%3BBeck%2C+A+W%3BCapaccioni%2C+F%3BCarsenty%2C+U%3BKeller%2C+H+U%3BDenevi%2C+B+W%3BSunshine%2C+J+M%3BRaymond%2C+C+A%3BRussell%2C+C+T&rft.aulast=McCord&rft.aufirst=T&rft.date=2012-11-01&rft.volume=491&rft.issue=7422&rft.spage=83&rft.isbn=&rft.btitle=&rft.title=Nature+%28London%29&rft.issn=00280836&rft_id=info:doi/10.1038%2Fnature11561 L2 - http://www.nature.com/nature/index.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 23 N1 - Document feature - illus. incl. sketch map N1 - Last updated - 2012-12-27 N1 - CODEN - NATUAS N1 - SubjectsTermNotLitGenreText - achondrites; albedo; asteroids; carbon; carbonaceous composition; dark material; HED meteorites; imagery; meteorites; mineral composition; parent bodies; photometry; stony meteorites; Vesta Asteroid; volatiles DO - http://dx.doi.org/10.1038/nature11561 ER - TY - JOUR T1 - Distinctive space weathering on Vesta from regolith mixing processes AN - 1244682806; 2013-007453 JF - Nature (London) AU - Pieters, C M AU - Ammannito, E AU - Blewett, D T AU - Denevi, B W AU - De Sanctis, M C AU - Gaffey, M J AU - Le Corre, L AU - Li, J Y AU - Marchi, S AU - McCord, T B AU - McFadden, L A AU - Mittlefehldt, D W AU - Nathues, A AU - Palmer, E AU - Reddy, V AU - Raymond, C A AU - Russell, C T Y1 - 2012/11/01/ PY - 2012 DA - 2012 Nov 01 SP - 79 EP - 82 PB - Macmillan Journals, London VL - 491 IS - 7422 SN - 0028-0836, 0028-0836 KW - stony meteorites KW - impact features KW - asteroids KW - Vesta Asteroid KW - Moon KW - parent bodies KW - HED meteorites KW - achondrites KW - weathering KW - NEAR Program KW - meteorites KW - space weathering KW - mineral composition KW - impact craters KW - spectra KW - regolith KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1244682806?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Nature+%28London%29&rft.atitle=Distinctive+space+weathering+on+Vesta+from+regolith+mixing+processes&rft.au=Pieters%2C+C+M%3BAmmannito%2C+E%3BBlewett%2C+D+T%3BDenevi%2C+B+W%3BDe+Sanctis%2C+M+C%3BGaffey%2C+M+J%3BLe+Corre%2C+L%3BLi%2C+J+Y%3BMarchi%2C+S%3BMcCord%2C+T+B%3BMcFadden%2C+L+A%3BMittlefehldt%2C+D+W%3BNathues%2C+A%3BPalmer%2C+E%3BReddy%2C+V%3BRaymond%2C+C+A%3BRussell%2C+C+T&rft.aulast=Pieters&rft.aufirst=C&rft.date=2012-11-01&rft.volume=491&rft.issue=7422&rft.spage=79&rft.isbn=&rft.btitle=&rft.title=Nature+%28London%29&rft.issn=00280836&rft_id=info:doi/10.1038%2Fnature11534 L2 - http://www.nature.com/nature/index.html LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 31 N1 - Document feature - illus. N1 - SuppNotes - Related article by Clark, B. E., on pp. 45-46 N1 - Last updated - 2012-12-27 N1 - CODEN - NATUAS N1 - SubjectsTermNotLitGenreText - achondrites; asteroids; HED meteorites; impact craters; impact features; meteorites; mineral composition; Moon; NEAR Program; parent bodies; regolith; space weathering; spectra; stony meteorites; Vesta Asteroid; weathering DO - http://dx.doi.org/10.1038/nature11534 ER - TY - JOUR T1 - RADIATION CARCINOGENESIS RISK ASSESSMENTS FOR NEVER-SMOKERS AN - 1238112283; 17349818 AB - Cigarette smoking, which is presently associated with more than 20% of adult deaths in the United States, is a large confounder to radiation risk estimates derived from epidemiology data. Astronauts and other exposed groups are classified as never-smokers (NS), defined as lifetime use of less than 100 cigarettes. In the past, radiation risk estimates have been made using average U.S. population rates for cancer and all causes of death, which may lead to overestimation of radiation risks for NS. In this report, age- and gender-specific radiation carcinogenesis risk calculations for NS and the average U.S. population are compared. Lung is the major tissue site for smoking and radiation-related cancer. However, other radiogenic cancers where tobacco has been shown to increase population cancer rates are esophagus, oral cavity, salivary gland, bladder, stomach, liver, colorectal, and leukemia. After adjusting U.S. cancer rates to remove smoking effects, radiation risks for lung and other cancers were estimated using the multiplicative risk model and a mixture model, with weighted contributions for additive and multiplicative risk transfer. Radiation mortality risks for NS were reduced compared to the average U.S. population by more than 20% and 50% in the mixture model and multiplicative transfer models, respectively. The authors discuss possible mechanisms of cancer risks from radiation and tobacco that suggest multiplicative effects could occur. These results suggest that improved understanding of possible synergisms between cancer initiators and promoters, such as radiation and tobacco, would greatly improve risk estimates and reduce uncertainties for differentially exposed groups, including NS. JF - Health Physics AU - Cucinotta, F A AU - Chappell, L J AU - Kim, M-HY AU - Wang, M AD - NASA, Lyndon B. Johnson Space Center, 2101 NASA Parkway, Houston, TX 77058, USA, Francis.A.Cucinotta@nasa.gov Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 643 EP - 651 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 103 IS - 5 SN - 0017-9078, 0017-9078 KW - Risk Abstracts; Health & Safety Science Abstracts; Toxicology Abstracts KW - Salivary gland KW - Oral cavity KW - Models KW - Promoters KW - Leukemia KW - Radiation KW - Cigarette smoking KW - Tobacco KW - Lung cancer KW - Esophagus KW - Mortality KW - Synergism KW - Data processing KW - Urinary bladder KW - Cancer KW - USA KW - Epidemiology KW - Lung KW - Carcinogenesis KW - Liver KW - Stomach KW - X 24380:Social Poisons & Drug Abuse KW - H 8000:Radiation Safety/Electrical Safety KW - R2 23060:Medical and environmental health UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1238112283?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=RADIATION+CARCINOGENESIS+RISK+ASSESSMENTS+FOR+NEVER-SMOKERS&rft.au=Cucinotta%2C+F+A%3BChappell%2C+L+J%3BKim%2C+M-HY%3BWang%2C+M&rft.aulast=Cucinotta&rft.aufirst=F&rft.date=2012-11-01&rft.volume=103&rft.issue=5&rft.spage=643&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/10.1097%2FHP.0b013e318267b3ad LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-12-01 N1 - Last updated - 2013-08-12 N1 - SubjectsTermNotLitGenreText - Esophagus; Mortality; Data processing; Urinary bladder; Salivary gland; Cancer; Oral cavity; Models; Leukemia; Promoters; Radiation; Epidemiology; Carcinogenesis; Cigarette smoking; Liver; Tobacco; Stomach; Lung cancer; Synergism; Lung; USA DO - http://dx.doi.org/10.1097/HP.0b013e318267b3ad ER - TY - JOUR T1 - DESCRIPTION OF TRANSPORT CODES FOR SPACE RADIATION SHIELDING AN - 1221145475; 17349816 AB - Exposure to ionizing radiation in the space environment is one of the hazards faced by crews in space missions. As space radiations traverse spacecraft, habitat shielding, or tissues, their energies and compositions are altered by interactions with the shielding. Modifications to the radiation fields arise from atomic interactions of charged particles with orbital electrons and nuclear interactions leading to projectile and target fragmentation, including secondary particles such as neutrons, protons, mesons, and nuclear recoils. The transport of space radiation through shielding can be simulated using Monte Carlo techniques or deterministic solutions of the Boltzmann equation. To determine shielding requirements and to resolve radiation constraints for future human missions, the shielding evaluation of a spacecraft concept is required as an early step in the design process. To do this requires (1) accurate knowledge of space environmental models to define the boundary condition for transport calculations, (2) transport codes with detailed shielding and body geometry models to determine particle transmission into areas of internal shielding and at each critical body organ, and (3) the assessment of organ dosimetric quantities and biological risks by applying the corresponding response models for space radiation against the particle spectra that have been accurately determined from the transport code. This paper reviews current transport codes and analyzes their accuracy through comparison to laboratory and spaceflight data. This paper also introduces a probabilistic risk assessment approach for the evaluation of radiation shielding. JF - Health Physics AU - Kim, M-HY AU - Wilson, J W AU - Cucinotta, F A AD - Division of Space Life Sciences, Universities Space Research Association, Houston, TX 77058, USA, myung-hee.y.kim@nasa.gov Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 621 EP - 639 PB - Williams & Wilkins, 351 W. Camden St. Baltimore MD 21201 United States VL - 103 IS - 5 SN - 0017-9078, 0017-9078 KW - Risk Abstracts KW - Risk assessment KW - Monte Carlo simulation KW - Ionizing radiation KW - Reviews KW - Particulates KW - Spacecraft KW - Habitat KW - Organs KW - Boundary conditions KW - R2 23020:Technological risks UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1221145475?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Health+Physics&rft.atitle=DESCRIPTION+OF+TRANSPORT+CODES+FOR+SPACE+RADIATION+SHIELDING&rft.au=Kim%2C+M-HY%3BWilson%2C+J+W%3BCucinotta%2C+F+A&rft.aulast=Kim&rft.aufirst=M-HY&rft.date=2012-11-01&rft.volume=103&rft.issue=5&rft.spage=621&rft.isbn=&rft.btitle=&rft.title=Health+Physics&rft.issn=00179078&rft_id=info:doi/10.1097%2FHP.0b013e318266732f LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-11-01 N1 - Last updated - 2013-08-12 N1 - SubjectsTermNotLitGenreText - Monte Carlo simulation; Risk assessment; Reviews; Ionizing radiation; Particulates; Habitat; Spacecraft; Boundary conditions; Organs DO - http://dx.doi.org/10.1097/HP.0b013e318266732f ER - TY - JOUR T1 - Non-myeloablative transplantation of bone marrow expressing self-antigen establishes peripheral tolerance and completely prevents autoimmunity in mice AN - 1142181788; 22071968 AB - Myeloablative transplantation of bone marrow (BM) engineered to express myelin oligodendrocyte glycoprotein (MOG) establishes central intrathymic tolerance and completely prevents MOG-induced experimental autoimmune encephalomyelitis (EAE) in mice. Here we asked whether non-myeloablative transplantation of MOG expressing BM (pMOG-bone marrow transplantation (BMT)) can also provide the same protection. Using stepwise reduction of irradiation doses, 275cGy irradiation with pMOG-BMT protected 100% of mice from EAE development even with two subsequent re-challenge with MOG. Irradiation doses <275cGy produced dose-dependent partial protection with significant disease protection still evident at 50cGy. Splenocytes from 275cGy recipients proliferated to MOG stimulation in vitro, indicating that MOG-reactive cells are present in the periphery but failed to induce disease. MOG-stimulated splenocytes produced little or no interleukin-17, interferon-γ, granulocyte-monocyte colony stimulating factor and tumor necrosis factor-α compared with EAE control. Adoptive transfer of CD4 T cells from EAE-resistant mice into Rag2(-/-) mice devoid of MOG expression resulted in MOG-induced EAE in 74% of mice. Treatment of EAE-resistant mice with anti-programmed death 1 (PD-1) monoclonal antibody-induced EAE in 67% of mice. We conclude that non-myeloablative transplantation of self-antigen expressing BM induces robust peripheral tolerance that completely prevented EAE development. Our findings implicate clonal anergy and the PD-1 pathway in the maintenance of peripheral tolerance. [PUBLICATION ABSTRACT] JF - Gene Therapy AU - Hosseini, H AU - Oh, D Y AU - Chan, S T AU - Chen, X T AU - Nasa, Z AU - Yagita, H AU - Alderuccio, F AU - Toh, B-h AU - Chan, J Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 1075 EP - 84 CY - Houndmills PB - Nature Publishing Group VL - 19 IS - 11 SN - 09697128 KW - Biology--Genetics KW - Antibodies KW - Antigens, Differentiation KW - Autoantigens KW - Cytokines KW - Inflammation Mediators KW - Myelin-Oligodendrocyte Glycoprotein KW - Pdcd1 protein, mouse KW - Autoimmune diseases KW - Antigens KW - Transplants & implants KW - Bone marrow KW - Gene therapy KW - Animals KW - Antibodies -- immunology KW - Antibodies -- administration & dosage KW - Myelin-Oligodendrocyte Glycoprotein -- genetics KW - Spleen -- metabolism KW - Encephalomyelitis, Autoimmune, Experimental -- immunology KW - Encephalomyelitis, Autoimmune, Experimental -- pathology KW - Antigens, Differentiation -- immunology KW - Cytokines -- biosynthesis KW - Transplantation Chimera KW - Cytokines -- immunology KW - Inflammation Mediators -- immunology KW - CD4-Positive T-Lymphocytes -- immunology KW - Mice KW - Dose-Response Relationship, Radiation KW - Myelin-Oligodendrocyte Glycoprotein -- immunology KW - Mice, Knockout KW - Whole-Body Irradiation KW - Adoptive Transfer KW - Encephalomyelitis, Autoimmune, Experimental -- genetics KW - Spleen -- immunology KW - Spinal Cord -- pathology KW - Female KW - T-Lymphocytes, Regulatory -- immunology KW - Transplantation Conditioning KW - Peripheral Tolerance -- genetics KW - Autoantigens -- immunology KW - Autoantigens -- genetics KW - Autoimmunity -- genetics KW - Bone Marrow Transplantation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1142181788?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthcompleteshell&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Gene+Therapy&rft.atitle=Non-myeloablative+transplantation+of+bone+marrow+expressing+self-antigen+establishes+peripheral+tolerance+and+completely+prevents+autoimmunity+in+mice&rft.au=Hosseini%2C+H%3BOh%2C+D+Y%3BChan%2C+S+T%3BChen%2C+X+T%3BNasa%2C+Z%3BYagita%2C+H%3BAlderuccio%2C+F%3BToh%2C+B-h%3BChan%2C+J&rft.aulast=Hosseini&rft.aufirst=H&rft.date=2012-11-01&rft.volume=19&rft.issue=11&rft.spage=1075&rft.isbn=&rft.btitle=&rft.title=Gene+Therapy&rft.issn=09697128&rft_id=info:doi/10.1038%2Fgt.2011.179 LA - English DB - ProQuest Central N1 - Copyright - Copyright Nature Publishing Group Nov 2012 N1 - Document feature - References N1 - Last updated - 2014-03-11 DO - http://dx.doi.org/10.1038/gt.2011.179 ER - TY - JOUR T1 - Net primary production of terrestrial ecosystems from 2000 to 2009 AN - 1125237234; 17319148 AB - The CASA (Carnegie-Ames-Stanford) ecosystem model has been used to estimate monthly carbon fluxes in terrestrial ecosystems from 2000 to 2009, with global data inputs from NASA's Terra Moderate Resolution Imaging Spectroradiometer (MODIS) vegetation cover mapping. Net primary production (NPP) flux for atmospheric carbon dioxide has varied slightly from year-to-year, but was predicted to have increased over short multi-year periods in the regions of the high-latitude Northern Hemisphere, South Asia, Central Africa, and the western Amazon since the year 2000. These CASA results for global NPP were found to be in contrast to other recently published modeling trends for terrestrial NPP with high sensitivity to regional drying patterns. Nonetheless, periodic declines in regional NPP were predicted by CASA for the southern and western Untied States, the southern Amazon, and southern and eastern Africa. NPP in tropical forest zones was examined in greater detail to discover lower annual production values than previously reported in many global models across the tropical rainforest zones, likely due to the enhanced detection of lower production ecosystems replacing primary rainforest. JF - Climatic Change AU - Potter, Christopher AU - Klooster, Steven AU - Genovese, Vanessa AD - NASA Ames Research Center, Moffett Field, CA, USA, chris.potter@nasa.gov Y1 - 2012/11// PY - 2012 DA - Nov 2012 SP - 365 EP - 378 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 115 IS - 2 SN - 0165-0009, 0165-0009 KW - Environment Abstracts; Sustainability Science Abstracts; Meteorological & Geoastrophysical Abstracts KW - Sensitivity KW - Ecosystems KW - Primary production KW - Climate and vegetation KW - Vegetation cover KW - Rain forests KW - Satellite data KW - Tropical forests KW - Ecosystems models KW - Terrestrial ecosystems KW - South America, Amazon R. KW - Africa KW - MODIS (Moderate Resolution Imaging Spectrometer) KW - Mapping KW - Asia KW - Carbon dioxide KW - M3 1010:Issues in Sustainable Development KW - M2 551.510.3/.4:Physical Properties/Composition (551.510.3/.4) KW - ENA 01:Air Pollution UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125237234?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Climatic+Change&rft.atitle=Net+primary+production+of+terrestrial+ecosystems+from+2000+to+2009&rft.au=Potter%2C+Christopher%3BKlooster%2C+Steven%3BGenovese%2C+Vanessa&rft.aulast=Potter&rft.aufirst=Christopher&rft.date=2012-11-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Climate and vegetation; Ecosystems models; Tropical forests; Satellite data; Ecosystems; MODIS (Moderate Resolution Imaging Spectrometer); Carbon dioxide; Primary production; Sensitivity; Vegetation cover; Rain forests; Terrestrial ecosystems; Mapping; South America, Amazon R.; Africa; Asia DO - http://dx.doi.org/10.1007/s10584-012-0460-2 ER - TY - JOUR T1 - The extreme melt across the Greenland ice sheet in 2012 AN - 1429839765; 2013-069131 AB - The discovery of the 2012 extreme melt event across almost the entire surface of the Greenland ice sheet is presented. Data from three different satellite sensors - including the Oceansat-2 scatterometer, the Moderate-resolution Imaging Spectroradiometer, and the Special Sensor Microwave Imager/Sounder - are combined to obtain composite melt maps, representing the most complete melt conditions detectable across the ice sheet. Satellite observations reveal that melt occurred at or near the surface of the Greenland ice sheet across 98.6% of its entire extent on 12 July 2012, including the usually cold polar areas at high altitudes like Summit in the dry snow facies of the ice sheet. This melt event coincided with an anomalous ridge of warm air that became stagnant over Greenland. As seen in melt occurrences from multiple ice core records at Summit reported in the published literature, such a melt event is rare with the last significant one occurring in 1889 and the next previous one around seven centuries earlier in the Medieval Warm Period. Given its rarity, the 2012 extreme melt across Greenland provides an exceptional opportunity for new studies in broad interdisciplinary geophysical research. Abstract Copyright (2012), American Geophysical Union. All Rights Reserved. JF - Geophysical Research Letters AU - Nghiem, S V AU - Hall, D K AU - Mote, T L AU - Tedesco, M AU - Albert, M R AU - Keegan, K AU - Shuman, C A AU - DiGirolamo, N E AU - Neumann, G Y1 - 2012/10/28/ PY - 2012 DA - 2012 Oct 28 SP - 6 PB - American Geophysical Union, Washington, DC VL - 39 IS - 20 SN - 0094-8276, 0094-8276 KW - imagery KW - Arctic region KW - Greenland ice sheet KW - glacial features KW - satellite methods KW - observations KW - microwave methods KW - Greenland KW - melting KW - ice KW - remote sensing KW - MODIS KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1429839765?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geophysical+Research+Letters&rft.atitle=The+extreme+melt+across+the+Greenland+ice+sheet+in+2012&rft.au=Nghiem%2C+S+V%3BHall%2C+D+K%3BMote%2C+T+L%3BTedesco%2C+M%3BAlbert%2C+M+R%3BKeegan%2C+K%3BShuman%2C+C+A%3BDiGirolamo%2C+N+E%3BNeumann%2C+G&rft.aulast=Nghiem&rft.aufirst=S&rft.date=2012-10-28&rft.volume=39&rft.issue=20&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Geophysical+Research+Letters&rft.issn=00948276&rft_id=info:doi/10.1029%2F2012GL053611 L2 - http://www.agu.org/journals/gl/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from John Wiley & Sons, Chichester, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 41 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2013-09-05 N1 - CODEN - GPRLAJ N1 - SubjectsTermNotLitGenreText - Arctic region; glacial features; Greenland; Greenland ice sheet; ice; imagery; melting; microwave methods; MODIS; observations; remote sensing; satellite methods DO - http://dx.doi.org/10.1029/2012GL053611 ER - TY - CPAPER T1 - Passively Controlled Thermal Material Deposited by Atomic Layer Deposition T2 - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AN - 1313112255; 6167937 JF - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AU - Dwivedi, Vivek AU - Adomaitis, Raymond AU - Travis, Curtisha Y1 - 2012/10/28/ PY - 2012 DA - 2012 Oct 28 KW - Chemical engineering UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313112255?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.atitle=Passively+Controlled+Thermal+Material+Deposited+by+Atomic+Layer+Deposition&rft.au=Dwivedi%2C+Vivek%3BAdomaitis%2C+Raymond%3BTravis%2C+Curtisha&rft.aulast=Dwivedi&rft.aufirst=Vivek&rft.date=2012-10-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2012/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Room Temperature Bubble Point Tests On Porous Screens: Implications for Cryogenic Liquid Acquisition Devices T2 - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AN - 1313103373; 6168953 JF - 2012 Annual Meeting of the American Institute for Chemical Engineering (AIChE 2012) AU - Hartwig, Jason AU - Mann, J Y1 - 2012/10/28/ PY - 2012 DA - 2012 Oct 28 KW - Temperature effects KW - Cryogenics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313103373?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.atitle=Room+Temperature+Bubble+Point+Tests+On+Porous+Screens%3A+Implications+for+Cryogenic+Liquid+Acquisition+Devices&rft.au=Hartwig%2C+Jason%3BMann%2C+J&rft.aulast=Hartwig&rft.aufirst=Jason&rft.date=2012-10-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=2012+Annual+Meeting+of+the+American+Institute+for+Chemical+Engineering+%28AIChE+2012%29&rft.issn=&rft_id=info:doi/ L2 - https://aiche.confex.com/aiche/2012/webprogram/start.html LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - Discrimination of biomass burning smoke and clouds in MAIAC algorithm AN - 1171878046; 17362645 AB - The Multi-Angle Implementation of Atmospheric Correction (MAIAC) algorithm makes aerosol retrievals from MODIS data at 1 km resolution providing information about the fine scale aerosol variability. This information is required in different applications such as urban air quality analysis, aerosol source identification etc. The quality of high resolution aerosol data is directly linked to the quality of cloud mask, in particular detection of small (sub-pixel) and low clouds. This work continues research in this direction, describing a technique to detect small clouds and introducing the "smoke test" to discriminate the biomass burning smoke from the clouds. The smoke test relies on a relative increase of aerosol absorption at MODIS wavelength 0.412 mu m as compared to 0.47-0.67 mu m due to multiple scattering and enhanced absorption by organic carbon released during combustion. This general principle has been successfully used in the OMI detection of absorbing aerosols based on UV measurements. This paper provides the algorithm detail and illustrates its performance on two examples of wildfires in US Pacific North-West and in Georgia/Florida of 2007. JF - Atmospheric Chemistry and Physics AU - Lyapustin, A AU - Korkin, S AU - Wang, Y AU - Quayle, B AU - Laszlo, I AD - Laboratory for Atmospheres, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Y1 - 2012/10/24/ PY - 2012 DA - 2012 Oct 24 SP - 9679 EP - 9686 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 20 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts; Pollution Abstracts KW - Absorption KW - Clouds KW - ASW, USA, Florida KW - Aerosols KW - SW 5010:Network design KW - P 0000:AIR POLLUTION KW - AQ 00008:Effects of Pollution KW - M2:551.510.42 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1171878046?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=Discrimination+of+biomass+burning+smoke+and+clouds+in+MAIAC+algorithm&rft.au=Lyapustin%2C+A%3BKorkin%2C+S%3BWang%2C+Y%3BQuayle%2C+B%3BLaszlo%2C+I&rft.aulast=Lyapustin&rft.aufirst=A&rft.date=2012-10-24&rft.volume=12&rft.issue=20&rft.spage=9679&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/10.5194%2Facp-12-9679-2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-11-01 N1 - Last updated - 2014-02-21 N1 - SubjectsTermNotLitGenreText - Clouds; Aerosols; ASW, USA, Florida DO - http://dx.doi.org/10.5194/acp-12-9679-2012 ER - TY - NEWS T1 - Space Launch System Providing Engine 'Brains' With an Upgrade AN - 1123841048 JF - UPI Space Daily AU - Bill Hubscher for "http://www.nasa.gov/centers/marshall/home/index.html" Marshall Space Flight Center Y1 - 2012/10/24/ PY - 2012 DA - 2012 Oct 24 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1123841048?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Space+Launch+System+Providing+Engine+%27Brains%27+With+an+Upgrade&rft.au=Bill+Hubscher+for+%22http%3A%2F%2Fwww.nasa.gov%2Fcenters%2Fmarshall%2Fhome%2Findex.html%22+Marshall+Space+Flight+Center&rft.aulast=Bill+Hubscher+for+%22http%3A%2F%2Fwww.nasa.gov%2Fcenters%2Fmarshall%2Fhome%2Findex.html%22+Marshall+Space+Flight+Center&rft.aufirst=&rft.date=2012-10-24&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-10-31 ER - TY - CPAPER T1 - Frequency-based spatial correlation assessments of the Ares I subscale acoustic model test firings T2 - 164th Meeting of the Acoustical Society of America AN - 1313092691; 6196448 JF - 164th Meeting of the Acoustical Society of America AU - Kenny, Robert AU - Houston, Janice Y1 - 2012/10/22/ PY - 2012 DA - 2012 Oct 22 KW - Acoustics KW - Acoustic models KW - Models UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313092691?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=164th+Meeting+of+the+Acoustical+Society+of+America&rft.atitle=Frequency-based+spatial+correlation+assessments+of+the+Ares+I+subscale+acoustic+model+test+firings&rft.au=Kenny%2C+Robert%3BHouston%2C+Janice&rft.aulast=Kenny&rft.aufirst=Robert&rft.date=2012-10-22&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=164th+Meeting+of+the+Acoustical+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - http://acousticalsociety.org/sites/default/files/KC_fullweek.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - CPAPER T1 - Psychoacoustic assessment of a new aircraft engine fan noise synthesis method T2 - 164th Meeting of the Acoustical Society of America AN - 1313078974; 6196249 JF - 164th Meeting of the Acoustical Society of America AU - Okcu, Selen AU - Allen, Matthew AU - Rizzi, Stephen Y1 - 2012/10/22/ PY - 2012 DA - 2012 Oct 22 KW - Aircraft KW - Noise levels UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313078974?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=164th+Meeting+of+the+Acoustical+Society+of+America&rft.atitle=Psychoacoustic+assessment+of+a+new+aircraft+engine+fan+noise+synthesis+method&rft.au=Okcu%2C+Selen%3BAllen%2C+Matthew%3BRizzi%2C+Stephen&rft.aulast=Okcu&rft.aufirst=Selen&rft.date=2012-10-22&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=164th+Meeting+of+the+Acoustical+Society+of+America&rft.issn=&rft_id=info:doi/ L2 - http://acousticalsociety.org/sites/default/files/KC_fullweek.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - NEWS T1 - The Orionid Meteor Shower AN - 1116448342 JF - UPI Space Daily AU - Dr. Tony Phillips for "http://science.nasa.gov/" NASA Science News Y1 - 2012/10/21/ PY - 2012 DA - 2012 Oct 21 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1116448342?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=The+Orionid+Meteor+Shower&rft.au=Dr.+Tony+Phillips+for+%22http%3A%2F%2Fscience.nasa.gov%2F%22+NASA+Science+News&rft.aulast=Dr.+Tony+Phillips+for+%22http%3A%2F%2Fscience.nasa.gov%2F%22+NASA+Science+News&rft.aufirst=&rft.date=2012-10-21&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-10-30 ER - TY - JOUR T1 - Pitted terrain on Vesta and implications for the presence of volatiles AN - 1220564909; 2013-002518 AB - We investigated the origin of unusual pitted terrain on asteroid Vesta, revealed in images from the Dawn spacecraft. Pitted terrain is characterized by irregular rimless depressions found in and around several impact craters, with a distinct morphology not observed on other airless bodies. Similar terrain is associated with numerous martian craters, where pits are thought to form through degassing of volatile-bearing material heated by the impact. Pitted terrain on Vesta may have formed in a similar manner, which indicates that portions of the surface contain a relatively large volatile component. Exogenic materials, such as water-rich carbonaceous chondrites, may be the source of volatiles, suggesting that impactor materials are preserved locally in relatively high abundance on Vesta and that impactor composition has played an important role in shaping the asteroid's geology. JF - Science AU - Denevi, Brett W AU - Blewett, D T AU - Buczkowski, D L AU - Capaccioni, F AU - Capria, M T AU - De Sanctis, M C AU - Garry, W B AU - Gaskell, R W AU - Le Corre, Lucille AU - Li, J Y AU - Marchi, S AU - McCoy, Timothy J AU - Nathues, A AU - O'Brien, D P AU - Petro, N E AU - Pieters, C M AU - Preusker, F AU - Raymond, Carol A AU - Reddy, V AU - Russell, C T AU - Schenk, P AU - Scully, J E C AU - Sunshine, J M AU - Tosi, F AU - Williams, D A AU - Wyrick, D Y1 - 2012/10/12/ PY - 2012 DA - 2012 Oct 12 SP - 246 EP - 249 PB - American Association for the Advancement of Science, Washington, DC VL - 338 IS - 6104 SN - 0036-8075, 0036-8075 KW - imagery KW - impact features KW - asteroids KW - Vesta Asteroid KW - pits KW - Mars KW - cosmochemistry KW - impacts KW - Dawn Mission KW - terrestrial planets KW - planets KW - volatiles KW - terrains KW - surface features KW - interplanetary comparison KW - impact craters KW - geochemistry KW - Marcia Crater KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220564909?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Pitted+terrain+on+Vesta+and+implications+for+the+presence+of+volatiles&rft.au=Denevi%2C+Brett+W%3BBlewett%2C+D+T%3BBuczkowski%2C+D+L%3BCapaccioni%2C+F%3BCapria%2C+M+T%3BDe+Sanctis%2C+M+C%3BGarry%2C+W+B%3BGaskell%2C+R+W%3BLe+Corre%2C+Lucille%3BLi%2C+J+Y%3BMarchi%2C+S%3BMcCoy%2C+Timothy+J%3BNathues%2C+A%3BO%27Brien%2C+D+P%3BPetro%2C+N+E%3BPieters%2C+C+M%3BPreusker%2C+F%3BRaymond%2C+Carol+A%3BReddy%2C+V%3BRussell%2C+C+T%3BSchenk%2C+P%3BScully%2C+J+E+C%3BSunshine%2C+J+M%3BTosi%2C+F%3BWilliams%2C+D+A%3BWyrick%2C+D&rft.aulast=Denevi&rft.aufirst=Brett&rft.date=2012-10-12&rft.volume=338&rft.issue=6104&rft.spage=246&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1225374 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 28 N1 - PubXState - DC N1 - Document feature - illus. N1 - Last updated - 2012-11-29 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - asteroids; cosmochemistry; Dawn Mission; geochemistry; imagery; impact craters; impact features; impacts; interplanetary comparison; Marcia Crater; Mars; pits; planets; surface features; terrains; terrestrial planets; Vesta Asteroid; volatiles DO - http://dx.doi.org/10.1126/science.1225374 ER - TY - JOUR T1 - Elemental mapping by Dawn reveals exogenic H in Vesta's regolith AN - 1220564901; 2013-002517 AB - Using Dawn's Gamma Ray and Neutron Detector, we tested models of Vesta's evolution based on studies of howardite, eucrite, and diogenite (HED) meteorites. Global Fe/O and Fe/Si ratios are consistent with HED compositions. Neutron measurements confirm that a thick, diogenitic lower crust is exposed in the Rheasilvia basin, which is consistent with global magmatic differentiation. Vesta's regolith contains substantial amounts of hydrogen. The highest hydrogen concentrations coincide with older, low-albedo regions near the equator, where water ice is unstable. The young, Rheasilvia basin contains the lowest concentrations. These observations are consistent with gradual accumulation of hydrogen by infall of carbonaceous chondrites-observed as clasts in some howardites-and subsequent removal or burial of this material by large impacts. JF - Science AU - Prettyman, Thomas H AU - Mittlefehldt, David W AU - Yamashita, Naoyuki AU - Lawrence, David J AU - Beck, Andrew W AU - Feldman, William C AU - McCoy, Timothy J AU - McSween, Harry Y AU - Toplis, Michael J AU - Titus, Timothy N AU - Tricarico, Pasquale AU - Reedy, Robert C AU - Hendricks, John S AU - Forni, Olivier AU - Le Corre, Lucille AU - Li, Jian-Yang AU - Mizzon, Hugau AU - Reddy, Vishnu AU - Raymond, Carol A AU - Russell, Christopher T Y1 - 2012/10/12/ PY - 2012 DA - 2012 Oct 12 SP - 242 EP - 246 PB - American Association for the Advancement of Science, Washington, DC VL - 338 IS - 6104 SN - 0036-8075, 0036-8075 KW - magmatic differentiation KW - Fe/Si KW - stony meteorites KW - oxygen KW - asteroids KW - Rheasilvia Basin KW - mapping KW - silicon KW - Dawn Mission KW - iron KW - meteorites KW - gamma-ray spectra KW - spectra KW - chondrites KW - geochemistry KW - Vesta Asteroid KW - HED meteorites KW - cosmochemistry KW - carbonaceous chondrites KW - achondrites KW - metals KW - magmas KW - Fe/O KW - regolith KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220564901?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Elemental+mapping+by+Dawn+reveals+exogenic+H+in+Vesta%27s+regolith&rft.au=Prettyman%2C+Thomas+H%3BMittlefehldt%2C+David+W%3BYamashita%2C+Naoyuki%3BLawrence%2C+David+J%3BBeck%2C+Andrew+W%3BFeldman%2C+William+C%3BMcCoy%2C+Timothy+J%3BMcSween%2C+Harry+Y%3BToplis%2C+Michael+J%3BTitus%2C+Timothy+N%3BTricarico%2C+Pasquale%3BReedy%2C+Robert+C%3BHendricks%2C+John+S%3BForni%2C+Olivier%3BLe+Corre%2C+Lucille%3BLi%2C+Jian-Yang%3BMizzon%2C+Hugau%3BReddy%2C+Vishnu%3BRaymond%2C+Carol+A%3BRussell%2C+Christopher+T&rft.aulast=Prettyman&rft.aufirst=Thomas&rft.date=2012-10-12&rft.volume=338&rft.issue=6104&rft.spage=242&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1225354 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 37 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch maps N1 - Last updated - 2012-11-29 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - achondrites; asteroids; carbonaceous chondrites; chondrites; cosmochemistry; Dawn Mission; Fe/O; Fe/Si; gamma-ray spectra; geochemistry; HED meteorites; iron; magmas; magmatic differentiation; mapping; metals; meteorites; oxygen; regolith; Rheasilvia Basin; silicon; spectra; stony meteorites; Vesta Asteroid DO - http://dx.doi.org/10.1126/science.1225354 ER - TY - JOUR T1 - Cometary volatiles and the origin of comets AN - 1656038176; 2015-014203 AB - We describe recent results on the CO/CO (sub 2) /H (sub 2) O composition of comets together with a survey of older literature (primarily for CO/H (sub 2) O) and compare these with models of the protoplanetary disk. Even with the currently small sample, there is a wide dispersion in abundance ratios and little if any systematic difference between Jupiter-family comets (JFCs) and long-period and Halley-type comets (LPCs and HTCs). We argue that the cometary observations require reactions on grain surfaces to convert CO to CO (sub 2) and also require formation of all types of comets in largely, but not entirely, overlapping regions, probably between the CO and CO (sub 2) snow lines. Any difference in the regions of formation is in the opposite direction from the classical picture with the JFCs having formed closer to the Sun than the LPCs. In the classical picture, the LPCs formed in the region of the giant planets and the JFCs formed in the Kuiper Belt. However, these data suggest, consistent with suggestions on dynamical grounds, that the JFCs and LPCs formed in largely overlapping regions where the giant planets are today and with JFCs on average forming slightly closer to the Sun than did the LPCs. Presumably at least the JFCs passed through the scattered disk on their way to their present dynamical family. Copyright (Copyright) 2012. The American Astronomical Society. All rights reserved. JF - The Astrophysical Journal AU - A'Hearn, Michael F AU - Feaga, Lori M AU - Keller, H Uwe AU - Kawakita, Hideyo AU - Hampton, Donald L AU - Kissel, Jochen AU - Klaasen, Kenneth P AU - McFadden, Lucy A AU - Meech, Karen J AU - Schultz, Peter H AU - Sunshine, Jessica M AU - Thomas, Peter C AU - Veverka, Joseph AU - Yeomans, Donald K AU - Besse, Sebastien AU - Bodewits, Dennis AU - Farnham, Tony L AU - Groussin, Olivier AU - Kelley, Michael S AU - Lisse, Carey M AU - Merlin, Frederic AU - Protopapa, Silvia AU - Wellnitz, Dennis D Y1 - 2012/10/10/ PY - 2012 DA - 2012 Oct 10 EP - Paper No. 29 PB - IOP Publishing for American Astronomical Society, Bristol VL - 758 IS - 1 SN - 0004-637X, 0004-637X KW - water KW - solar system KW - Oort Cloud KW - migration KW - orbits KW - Kuiper Belt KW - long-period comets KW - protoplanetary disk KW - giant planets KW - carbon dioxide KW - models KW - planets KW - carbon monoxide KW - volatiles KW - comets KW - Halley-type comets KW - dynamics KW - classification KW - Jupiter-family comets KW - heterogeneity KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1656038176?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal&rft.atitle=Cometary+volatiles+and+the+origin+of+comets&rft.au=A%27Hearn%2C+Michael+F%3BFeaga%2C+Lori+M%3BKeller%2C+H+Uwe%3BKawakita%2C+Hideyo%3BHampton%2C+Donald+L%3BKissel%2C+Jochen%3BKlaasen%2C+Kenneth+P%3BMcFadden%2C+Lucy+A%3BMeech%2C+Karen+J%3BSchultz%2C+Peter+H%3BSunshine%2C+Jessica+M%3BThomas%2C+Peter+C%3BVeverka%2C+Joseph%3BYeomans%2C+Donald+K%3BBesse%2C+Sebastien%3BBodewits%2C+Dennis%3BFarnham%2C+Tony+L%3BGroussin%2C+Olivier%3BKelley%2C+Michael+S%3BLisse%2C+Carey+M%3BMerlin%2C+Frederic%3BProtopapa%2C+Silvia%3BWellnitz%2C+Dennis+D&rft.aulast=A%27Hearn&rft.aufirst=Michael&rft.date=2012-10-10&rft.volume=758&rft.issue=1&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F758%2F1%2F29 L2 - http://iopscience.iop.org/0004-637X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2015-01-01 N1 - Number of references - 51 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2015-02-19 N1 - SubjectsTermNotLitGenreText - carbon dioxide; carbon monoxide; classification; comets; dynamics; giant planets; Halley-type comets; heterogeneity; Jupiter-family comets; Kuiper Belt; long-period comets; migration; models; Oort Cloud; orbits; planets; protoplanetary disk; solar system; volatiles; water DO - http://dx.doi.org/10.1088/0004-637X/758/1/29 ER - TY - JOUR T1 - Radiative impacts of cloud heterogeneity and overlap in an atmospheric General Circulation Model AN - 1125237133; 17322497 AB - The radiative impacts of horizontal heterogeneity of layer cloud condensate, and vertical overlap of both condensate and cloud fraction are examined with the aid of a new radiation package operating in the GEOS-5 Atmospheric General Circulation Model. The impacts are examined in terms of diagnostic top-of-the atmosphere shortwave (SW) and longwave (LW) cloud radiative effect (CRE) calculations for a range of assumptions and overlap parameter specifications. The investigation is conducted for two distinct cloud schemes, one that comes with the standard GEOS-5 distribution, and another used experimentally for its enhanced cloud microphysical capabilities. Both schemes are coupled to a cloud generator allowing arbitrary cloud overlap specification. Results show that cloud overlap radiative impacts are significantly stronger in the operational cloud scheme where a change of cloud fraction overlap from maximum-random to generalized results in global changes of SW and LW CRE of similar to 4 Wm super(-2), and zonal changes of up to similar to 10 Wm super(-2). This is an outcome of fewer occurrences (compared to the other scheme) of large layer cloud fractions and fewer multi-layer situations where large numbers of atmospheric layers are simultaneously cloudy, both conditions that make overlap details more important. The impact of the specifics of condensate distribution overlap on CRE is much weaker. Once generalized overlap is adopted, both cloud schemes are only modestly sensitive to the exact values of the overlap parameters. When one of the CRE components is overestimated and the other underestimated, both cannot be driven simoultaneously towards observed values by adjustments to cloud condensate heterogeneity and overlap specifications alone. JF - Atmospheric Chemistry and Physics AU - Oreopoulos, L AU - Lee, D AU - Sud, Y C AU - Suarez, MJ AD - NASA Goddard Space Flight Center, Greenbelt, MD, USA Y1 - 2012/10/04/ PY - 2012 DA - 2012 Oct 04 SP - 9097 EP - 9111 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 19 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Specifications KW - Atmosphere KW - Condensates KW - Radiation KW - Heterogeneity KW - Atmospheric Chemistry KW - Atmospheric circulation KW - Model Studies KW - Clouds KW - General circulation models KW - Atmospheric chemistry KW - Standards KW - AQ 00001:Water Resources and Supplies KW - SW 5010:Network design KW - Q2 09188:Atmospheric chemistry KW - M2 551.513:General Circulation (551.513) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125237133?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=Radiative+impacts+of+cloud+heterogeneity+and+overlap+in+an+atmospheric+General+Circulation+Model&rft.au=Oreopoulos%2C+L%3BLee%2C+D%3BSud%2C+Y+C%3BSuarez%2C+MJ&rft.aulast=Oreopoulos&rft.aufirst=L&rft.date=2012-10-04&rft.volume=12&rft.issue=19&rft.spage=9097&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/10.5194%2Facp-12-9097-2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Clouds; Atmospheric chemistry; Atmospheric circulation; Radiation; General circulation models; Atmospheric Chemistry; Condensates; Standards; Atmosphere; Specifications; Heterogeneity; Model Studies DO - http://dx.doi.org/10.5194/acp-12-9097-2012 ER - TY - NEWS T1 - Curiosity Rover Plays First Song Transmitted from Another Planet AN - 1081521829 JF - UPI Space Daily AU - Ann Marie for NASA Y1 - 2012/10/02/ PY - 2012 DA - 2012 Oct 02 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1081521829?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Curiosity+Rover+Plays+First+Song+Transmitted+from+Another+Planet&rft.au=Ann+Marie+for+NASA&rft.aulast=Ann+Marie+for+NASA&rft.aufirst=&rft.date=2012-10-02&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-10-02 ER - TY - JOUR T1 - The Habitable Zone and Extreme Planetary Orbits AN - 1827887812; PQ0003681131 AB - The habitable zone for a given star describes the range of circumstellar distances from the star within which a planet could have liquid water on its surface, which depends upon the stellar properties. Here we describe the development of the habitable zone concept, its application to our own solar system, and its subsequent application to exoplanetary systems. We further apply this to planets in extreme eccentric orbits and show how they may still retain life-bearing properties depending upon the percentage of the total orbit which is spent within the habitable zone. Key Words: Extrasolar planets-Habitable zone-Astrobiology. Astrobiology 12, 940-945. JF - Astrobiology AU - Kane, Stephen R AU - Gelino, Dawn M AD - NASA Exoplanet Science Institute, Caltech, Pasadena, California. Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 940 EP - 945 PB - Mary Ann Liebert, Inc., 2 Madison Ave Larchmont NY 10538-1962 United States VL - 12 IS - 10 SN - 1531-1074, 1531-1074 KW - ASFA 1: Biological Sciences & Living Resources; Ecology Abstracts KW - Planning KW - Q1 08203:Taxonomy and morphology KW - D 04040:Ecosystem and Ecology Studies UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1827887812?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrobiology&rft.atitle=The+Habitable+Zone+and+Extreme+Planetary+Orbits&rft.au=Kane%2C+Stephen+R%3BGelino%2C+Dawn+M&rft.aulast=Kane&rft.aufirst=Stephen&rft.date=2012-10-01&rft.volume=12&rft.issue=10&rft.spage=940&rft.isbn=&rft.btitle=&rft.title=Astrobiology&rft.issn=15311074&rft_id=info:doi/10.1089%2Fast.2011.0798 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-10-01 N1 - Number of references - 48 N1 - Last updated - 2016-12-22 N1 - SubjectsTermNotLitGenreText - Planning DO - http://dx.doi.org/10.1089/ast.2011.0798 ER - TY - JOUR T1 - Phytoplankton assemblage patterns in the southern Mid-Atlantic Bight AN - 1722180886; PQ0002086761 AB - As part of the Wallops Coastal Oceans Observing Laboratory (Wa-COOL) Project, we sampled a time-series transect in the southern Mid-Atlantic Bight (MAB) biweekly. Our 2-year time-series data included physical parameters, nutrient concentrations, and chlorophyll a concentrations. A detailed phytoplankton assemblage structure was examined in the second year. During the 2-year study, chlorophyll a concentration (and ocean color satellite imagery) indicated that phytoplankton blooms occurred in January/February during mixing conditions and in early autumn under stratified conditions. The chlorophyll a concentrations ranged from 0.25 mu g l-1 to 15.49 mu g l-1 during the 2-year period. We were able to discriminate approximately 116 different species under phase contrast microscopy. Dominant phytoplankton included Skeletonema costatum, Rhizosolenia spp., and Pseudo-nitzschia pungens. In an attempt to determine phytoplankton species competition/succession within the assemblage, we calculated a Shannon Weaver diversity index for our diatom microscopy data. Diatom diversity was greatest during the winter and minimal during the spring. Diatom diversity was also greater at nearshore stations than at offshore stations. Individual genera appeared patchy, with surface and subsurface patches appearing abruptly and persisting for only 1-2 months at a time. The distribution of individual species differed significantly from bulk variables of the assemblage (chlorophyll a) and total phytoplankton assemblage (cells), which indicates that phytoplankton species may be limited in growth in ways that differ from those of the total assemblage. Our study demonstrated a highly diverse phytoplankton assemblage throughout the year, with opportunistic species dominating during spring and fall in response to seasonal changes in temperature and nutrients in the southern MAB. JF - Botanica Marina AU - Makinen, Carla P AU - Moisan, Tiffany AH AD - 1URS Corporation, NASA/GSFC Wallops Flight Facility, Wallops Island, VA 23337, USA, tiffany.a.moisan@nasa.gov Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 445 EP - 457 PB - Walter de Gruyter GmbH & Co. KG, Genthiner Str. 13 Berlin 10785 Germany VL - 55 IS - 5 SN - 0006-8055, 0006-8055 KW - Microbiology Abstracts C: Algology, Mycology & Protozoology; Sustainability Science Abstracts; Oceanic Abstracts; ASFA 1: Biological Sciences & Living Resources KW - coastal KW - diversity KW - Mid-Atlantic Bight KW - phytoplankton KW - time series KW - Chlorophylls KW - Algal blooms KW - Chlorophyll KW - Remote sensing KW - Diatoms KW - Phytoplankton KW - Genetic diversity KW - Nutrients KW - Time series analysis KW - Succession KW - Winter KW - Pseudo-nitzschia pungens KW - Sulfur dioxide KW - Skeletonema costatum KW - Interspecific relationships KW - Competition KW - Seasonal variations KW - Temperature effects KW - Data processing KW - Monoclonal antibodies KW - Image processing KW - Satellites KW - Rhizosolenia KW - Dominant species KW - Satellite sensing KW - Community composition KW - Oceans KW - Microscopy KW - ANW, USA, Mid-Atlantic Bight KW - Nutrient concentrations KW - M3 1010:Issues in Sustainable Development KW - O 6030:Oil and Gas Resources KW - Q1 08423:Behaviour KW - K 03450:Ecology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1722180886?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Botanica+Marina&rft.atitle=Phytoplankton+assemblage+patterns+in+the+southern+Mid-Atlantic+Bight&rft.au=Makinen%2C+Carla+P%3BMoisan%2C+Tiffany+AH&rft.aulast=Makinen&rft.aufirst=Carla&rft.date=2012-10-01&rft.volume=55&rft.issue=5&rft.spage=445&rft.isbn=&rft.btitle=&rft.title=Botanica+Marina&rft.issn=00068055&rft_id=info:doi/10.1515%2Fbot-2012-0110 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-10-01 N1 - Last updated - 2016-03-30 N1 - SubjectsTermNotLitGenreText - Satellite sensing; Algal blooms; Dominant species; Chlorophylls; Community composition; Interspecific relationships; Genetic diversity; Phytoplankton; Seasonal variations; Temperature effects; Chlorophyll; Data processing; Monoclonal antibodies; Diatoms; Image processing; Nutrients; Succession; Satellites; Oceans; Microscopy; Nutrient concentrations; Competition; Remote sensing; Time series analysis; Winter; Sulfur dioxide; Pseudo-nitzschia pungens; Skeletonema costatum; Rhizosolenia; ANW, USA, Mid-Atlantic Bight DO - http://dx.doi.org/10.1515/bot-2012-0110 ER - TY - JOUR T1 - MEASUREMENTS OF CO REDSHIFTS WITH Z-SPEC FOR LENSED SUBMILLIMETER GALAXIES DISCOVERED IN THE H-ATLAS SURVEY AN - 1709175433; PQ0001858452 AB - We present new observations from Z-Spec, a broadband 185-305 GHz spectrometer, of five submillimeter bright lensed sources selected from the Herschel-Astrophysical Terahertz Large Area Survey science demonstration phase catalog. We construct a redshift-finding algorithm using combinations of the signal to noise of all the lines falling in the Z-Spec bandpass to determine redshifts with high confidence, even in cases where the signal to noise in individual lines is low. We measure the dust continuum in all sources and secure CO redshifts for four out of five (z ~ 1.5-3). In one source, SDP. 17, we tentatively identify two independent redshifts and a water line, confirmed at z = 2.308. Our sources have properties characteristic of dusty starburst galaxies, with magnification-corrected star formation rates of 10 super(2-3) M sub([middot in circle]) yr super(-1). Lower limits for the dust masses (~ a few 10 super(8) M sub([middot in circle])) and spatial extents (~1 kpc equivalent radius) are derived from the continuum spectral energy distributions, corresponding to dust temperatures between 54 and 69 K. In the local thermodynamic equilibrium (LTE) approximation, we derive relatively low CO excitation temperatures ([lap] 100 K) and optical depths ([tau] [lap] 1). Performing a non-LTE excitation analysis using RADEX, we find that the CO lines measured by Z-Spec (from J = 4 [arrowright] 3 to 10 [arrowright] 9, depending on the galaxy) localize the best solutions to either a high-temperature/low-density region or a low/temperature/high-density region near the LTE solution, with the optical depth varying accordingly. Observations of additional CO lines, CO(1-0) in particular, are needed to constrain the non-LTE models. JF - Astrophysical Journal AU - Lupu, R E AU - Scott, K S AU - Aguirre, J E AU - ARETXAGA, I AU - Auld, R AU - Barton, E AU - Beelen, A AU - Bertoldi, F AU - Bock, J J AU - Bonfield, D AD - Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA, Roxana.E.Lupu@nasa.gov Y1 - 2012/10/01/ PY - 2012 DA - 2012 Oct 01 SP - 1 EP - 27 PB - IOP Publishing, The Public Ledger Building, Suite 929 Philadelphia PA 19106 United States VL - 757 IS - 2 SN - 0004-637X, 0004-637X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - galaxies: distances and redshifts KW - galaxies: high-redshift KW - galaxies: ISM KW - line: identification KW - submillimeter: galaxies KW - Thermodynamics KW - Acoustic waves KW - Temperature KW - Galaxies KW - Algorithms KW - Dust KW - Optical analysis KW - Galactic formation KW - Local thermodynamic equilibrium KW - Energy KW - Star formation KW - Noise pollution KW - P 0000:AIR POLLUTION KW - M2 524:Stars, Universe (524) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1709175433?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrophysical+Journal&rft.atitle=MEASUREMENTS+OF+CO+REDSHIFTS+WITH+Z-SPEC+FOR+LENSED+SUBMILLIMETER+GALAXIES+DISCOVERED+IN+THE+H-ATLAS+SURVEY&rft.au=Lupu%2C+R+E%3BScott%2C+K+S%3BAguirre%2C+J+E%3BARETXAGA%2C+I%3BAuld%2C+R%3BBarton%2C+E%3BBeelen%2C+A%3BBertoldi%2C+F%3BBock%2C+J+J%3BBonfield%2C+D&rft.aulast=Lupu&rft.aufirst=R&rft.date=2012-10-01&rft.volume=757&rft.issue=2&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F757%2F2%2F135 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-09-01 N1 - Last updated - 2015-11-16 N1 - SubjectsTermNotLitGenreText - Local thermodynamic equilibrium; Galactic formation; Star formation; Acoustic waves; Algorithms; Galaxies; Noise pollution; Optical analysis; Thermodynamics; Energy; Temperature; Dust DO - http://dx.doi.org/10.1088/0004-637X/757/2/135 ER - TY - JOUR T1 - VLBI; a fascinating technique for geodesy and astrometry AN - 1641013243; 2015-000610 AB - Since the 1970s Very Long Baseline Interferometry (VLBI) has proven to be a primary space-geodetic technique by determining precise coordinates on the Earth, by monitoring the variable Earth rotation and orientation with highest precision, and by deriving many other parameters of the Earth system. VLBI provides an important linkage to astronomy through, for instance, the determination of very precise coordinates of extragalactic radio sources. Additionally, it contributes to determining parameters of relativistic and cosmological models. After a short review of the history of geodetic VLBI and a summary of recent results, this paper describes future perspectives of this fascinating technique. The International VLBI Service for Geodesy and Astrometry (IVS), as a service of the International Association of Geodesy (IAG) and the International Astronomical Union (IAU), is well on its way to fully defining a next generation VLBI system, called VLBI2010. The goals of the new system are to achieve on scales up to the size of the Earth an accuracy of 1 mm in position and of 0.1 mm/year in velocity. Continuous observations shall be carried out 24 h per day 7 days per week in the future with initial results to be delivered within 24 h after taking the data. Special sessions, e.g. for monitoring the Earth rotation parameters, will provide the results in near real-time. These goals require a completely new technical and conceptual design of VLBI measurements. Based on extensive simulation studies, strategies have been developed by the IVS to significantly improve its product accuracy through the use of a network of small ( approximately 12 m) fast-slewing antennas. A new method for generating high precision delay measurements as well as improved methods for handling biases related to radio source structure, system electronics, and deformations of the antenna structures has been developed. Furthermore, as of January 2012, the construction of ten new VLBI2010 sites has been funded, with good prospects for one dozen more antennas, which will improve the geographical distribution of geodetic VLBI sites on Earth and provide an important step toward a global VLBI2010 network. Within this paper, the Global Geodetic Observing System (GGOS) of the IAG will also be introduced and the contribution of VLBI to GGOS will be described. Abstract Copyright (2012) Elsevier, B.V. JF - Journal of Geodynamics AU - Schuh, H AU - Behrend, D Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 68 EP - 80 PB - Elsevier, Oxford VL - 61 SN - 0264-3707, 0264-3707 KW - networks KW - VLBI2010 network KW - data acquisition KW - global KW - data processing KW - TIGO Concepcion earthquake 2010 KW - geodesy KW - displacements KW - satellite methods KW - Global Geodetic Observing System KW - interferometry KW - gravity field KW - rotation KW - radio-wave methods KW - velocity KW - planetology KW - very long baseline interferometry KW - instruments KW - faults KW - remote sensing KW - 18:Solid-earth geophysics KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641013243?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geodynamics&rft.atitle=VLBI%3B+a+fascinating+technique+for+geodesy+and+astrometry&rft.au=Schuh%2C+H%3BBehrend%2C+D&rft.aulast=Schuh&rft.aufirst=H&rft.date=2012-10-01&rft.volume=61&rft.issue=&rft.spage=68&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geodynamics&rft.issn=02643707&rft_id=info:doi/10.1016%2Fj.jog.2012.07.007 L2 - http://www.sciencedirect.com/science/journal/02643707 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2015-01-01 N1 - Number of references - 36 N1 - Document feature - illus. incl. 4 tables, geol. sketch map N1 - Last updated - 2014-12-31 N1 - SubjectsTermNotLitGenreText - data acquisition; data processing; displacements; faults; geodesy; global; Global Geodetic Observing System; gravity field; instruments; interferometry; networks; planetology; radio-wave methods; remote sensing; rotation; satellite methods; TIGO Concepcion earthquake 2010; velocity; very long baseline interferometry; VLBI2010 network DO - http://dx.doi.org/10.1016/j.jog.2012.07.007 ER - TY - JOUR T1 - Small Business and the Public Library: Strategies for a Successful Partnership AN - 1550991652; 201406759 AB - Book review abstract. Small Business and the Public Library: Strategies for a Successful Partnership. By Luise Weiss, Sophia Serlis-McPhillips, and Elizabeth Malafi. Chicago, IL: American Library Association, 2011, 144pp., 55.00 USD (ALA Members 49.50 USD) (softcover). ISBN: 978-0-8389-0993-5. Reviewed by Kate Dunlap. Adapted from the source document. JF - Technical Services Quarterly AU - Dunlap, Kate AU - Dunlap, Kate AD - NASA Glenn Research Center, Cleveland, OH Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 356 EP - 358 PB - Taylor & Francis, Philadelphia PA VL - 29 IS - 4 SN - 0731-7131, 0731-7131 KW - Business KW - Small firms KW - Collaboration KW - Public libraries KW - article KW - 1.11: BOOK REVIEWS UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1550991652?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Alisa&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=Technical+Services+Quarterly&rft.atitle=Small+Business+and+the+Public+Library%3A+Strategies+for+a+Successful+Partnership&rft.au=McClintock%2C+William+E%3BBenna%2C+Medhi%3BBurger%2C+Matthew+H%3BCassidy%2C+Timothy%3BKillen%2C+Rosemary+M%3BMerkel%2C+Aimee+W%3BSarantos%2C+Menelaos%3BSolomon%2C+S+C%3BSprague%2C+A+L%3BVervack%2C+Ron+J%3BAnonymous&rft.aulast=McClintock&rft.aufirst=William&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - Library & Information Science Abstracts (LISA) N1 - Date revised - 2015-06-01 N1 - Last updated - 2016-09-27 N1 - SubjectsTermNotLitGenreText - Small firms; Public libraries; Collaboration; Business DO - http://dx.doi.org/10.1080/07317131.2012.705763 ER - TY - JOUR T1 - Astrobiology and society; building an interdisciplinary research community AN - 1549620644; 2014-059441 JF - Astrobiology AU - Race, Margaret AU - Denning, Kathryn AU - Bertka, Constance M AU - Dick, Steven J AU - Harrison, Albert A AU - Impey, Christopher AU - Mancinelli, Rocco Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 958 EP - 965 PB - Mary Ann Liebert, Larchmont, NY VL - 12 IS - 10 SN - 1531-1074, 1531-1074 KW - public awareness KW - sociology KW - NASA Astrobiology Institute KW - interdisciplinary studies KW - philosophy KW - government agencies KW - astrobiology KW - education KW - research KW - concepts KW - life origin KW - NASA KW - future KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620644?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrobiology&rft.atitle=Astrobiology+and+society%3B+building+an+interdisciplinary+research+community&rft.au=Race%2C+Margaret%3BDenning%2C+Kathryn%3BBertka%2C+Constance+M%3BDick%2C+Steven+J%3BHarrison%2C+Albert+A%3BImpey%2C+Christopher%3BMancinelli%2C+Rocco&rft.aulast=Race&rft.aufirst=Margaret&rft.date=2012-10-01&rft.volume=12&rft.issue=10&rft.spage=958&rft.isbn=&rft.btitle=&rft.title=Astrobiology&rft.issn=15311074&rft_id=info:doi/ L2 - http://www.liebertpub.com/publication.aspx?pub_id=99 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 16 N1 - PubXState - NY N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 11, 2013 N1 - Last updated - 2014-11-13 N1 - SubjectsTermNotLitGenreText - astrobiology; concepts; education; future; government agencies; interdisciplinary studies; life origin; NASA; NASA Astrobiology Institute; philosophy; public awareness; research; sociology DO - http://dx.doi.org/10.1089/ast.2011.0723 ER - TY - JOUR T1 - A proposal for rover geological exploration on Mars AN - 1438969521; 2013-075310 AB - This paper outlines a new proposal for a Japanese-led geological rover-based exploration mission to Mars. Previous USA, former Soviet Union, and European missions have identified a wide diversity of Martian environments and a complex series of physical and chemical processes that operate or have operated on the Martian surface. Rover exploration, and associated chemical and isotopic analysis of geological material, allows us to understand and resolve the environmental evolution of the area around the landing site, and the proposed scientific target of the geological exploration part of this Martian mission will have a sedimentary or volcanic focus. Investigating sedimentary rocks will mean that this mission follows the road map advocated by NASA and European Space Agency (ESA) for the search for life on Mars. However, focusing this mission on volcanic rocks may open up a new field of research in Mars science. Although the focus has not been finalized, this future mission to Mars needs to be evaluated and supported by a broad community of Japanese Earth and planetary scientists. JF - Chishitsugaku Zasshi = Journal of the Geological Society of Japan AU - Namiki, Noriyuki AU - Komatsu, Goro AU - Usui, Tomohiro AU - Sugita, Seiji AU - Miyamoto, Hideaki AU - Kubota, Takashi AU - Ishigami, Genya AU - Demura, Hirohide AU - Okada, Tatsuaki AU - Miura, Yayoi N AU - Cho, Yuichiro AU - Goto, Kazuhisa AU - Senshu, Hiroki AU - Wada, Koji AU - Ishibashi, Ko AU - Arai, Tomoko AU - Kobayashi, Masanori AU - Ohno, Sohsuke Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 606 EP - 617 PB - Nippon Chishitsugaku Gakkai, Tokyo VL - 118 IS - 10 SN - 0016-7630, 0016-7630 KW - volcanic rocks KW - igneous rocks KW - astrobiology KW - Mars KW - rovers KW - landing sites KW - exploration KW - terrestrial planets KW - planets KW - sedimentary rocks KW - future KW - Gusev Crater KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1438969521?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Chishitsugaku+Zasshi+%3D+Journal+of+the+Geological+Society+of+Japan&rft.atitle=A+proposal+for+rover+geological+exploration+on+Mars&rft.au=Namiki%2C+Noriyuki%3BKomatsu%2C+Goro%3BUsui%2C+Tomohiro%3BSugita%2C+Seiji%3BMiyamoto%2C+Hideaki%3BKubota%2C+Takashi%3BIshigami%2C+Genya%3BDemura%2C+Hirohide%3BOkada%2C+Tatsuaki%3BMiura%2C+Yayoi+N%3BCho%2C+Yuichiro%3BGoto%2C+Kazuhisa%3BSenshu%2C+Hiroki%3BWada%2C+Koji%3BIshibashi%2C+Ko%3BArai%2C+Tomoko%3BKobayashi%2C+Masanori%3BOhno%2C+Sohsuke&rft.aulast=Namiki&rft.aufirst=Noriyuki&rft.date=2012-10-01&rft.volume=118&rft.issue=10&rft.spage=606&rft.isbn=&rft.btitle=&rft.title=Chishitsugaku+Zasshi+%3D+Journal+of+the+Geological+Society+of+Japan&rft.issn=00167630&rft_id=info:doi/ L2 - https://www.jstage.jst.go.jp/article/geosoc/118/10/118_2012.0016/_pdf http://www.jstage.jst.go.jp/browse/geosoc LA - Japanese DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 62 N1 - Document feature - illus. incl. 1 table, sketch map N1 - Last updated - 2013-10-03 N1 - CODEN - CHTZA5 N1 - SubjectsTermNotLitGenreText - astrobiology; exploration; future; Gusev Crater; igneous rocks; landing sites; Mars; planets; rovers; sedimentary rocks; terrestrial planets; volcanic rocks ER - TY - JOUR T1 - Spectral reflectance properties of carbonaceous chondrites; 6, CV chondrites AN - 1282822764; 2013-013899 AB - Multiple reflectance spectra of 11 CV chondrites have been measured to determine spectral-compositional relationships for this meteorite class and to aid the search for CV parent bodies. The reflectance of CV chondrite spectra is variable, ranging from approximately 5% to 13% at 0.56 mu m, and approximately 5% to 15% at the 0.7 mu m region local reflectance maximum. Overall slopes range from slightly blue to red for powders, while slab spectra are strongly blue-sloped. With increasing average grain size and/or removal of the finest fraction, CV spectra generally become more blue-sloped. CV spectra are characterized by ubiquitous absorption features in the 1 and 2 mu m regions. The 1 mu m region is usually characterized by a band centered near 1.05-1.08 mu m and a band or shoulder near 1.3 mu m that are characteristic of Fe-rich olivine. Band depths in the 1 mu m region for powdered CVs and slabs range from approximately 1% to 10%. The 2 mu m region is characterized by a region of broad absorption that extends beyond 2 mu m and usually includes band minima near 1.95 and 2.1 mu m; these features are characteristic of Fe (super 2+) -bearing spinel. The sample suite is not comprehensive enough to firmly establish whether spectral differences exist between CVR, CV (sub OxA) , and CV (sub OxB) subclasses, or as a function of metamorphic grade. However, we believe that the mineralogic and petrologic differences that exist between these classes, and with varying petrologic subtype (CV3.0-->3.7), may not be significant enough to result in measurable spectral differences that exceed spectral variations within a subgroup, within an individual meteorite, or as a function of grain size. Terrestrial weathering seems to affect CV spectra most noticeably in the visible region, resulting in more red-sloped spectra for finds as compared to falls. The search for CV parent bodies should focus on the detection of olivine and spinel absorption bands, specifically absorption features near 1.05, 1.3, 1.95, and 2.1 mu m, as these are the most commonly seen spectral features of CV chondrites. JF - Icarus AU - Cloutis, E A AU - Hudon, P AU - Hiroi, T AU - Gaffey, M J AU - Mann, P AU - Bell, J F, III Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 328 EP - 358 PB - Elsevier, New York, NY VL - 221 IS - 1 SN - 0019-1035, 0019-1035 KW - silicates KW - terrestrial environment KW - stony meteorites KW - calcium-aluminum inclusions KW - mafic composition KW - olivine group KW - CV chondrites KW - Allende Meteorite KW - meteorites KW - ALH 84028 KW - carbon KW - olivine KW - inclusions KW - orthosilicates KW - oxides KW - spectra KW - chondrites KW - Eh KW - opaque minerals KW - modal analysis KW - breccia KW - secondary minerals KW - parent bodies KW - matrix KW - grain size KW - spinel KW - Vigarano Meteorite KW - Grosnaja Meteorite KW - thermal metamorphism KW - carbonaceous chondrites KW - metamorphism KW - weathering KW - nesosilicates KW - aqueous alteration KW - Allan Hills Meteorites KW - chondrules KW - petrography KW - reflectance KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282822764?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Spectral+reflectance+properties+of+carbonaceous+chondrites%3B+6%2C+CV+chondrites&rft.au=Cloutis%2C+E+A%3BHudon%2C+P%3BHiroi%2C+T%3BGaffey%2C+M+J%3BMann%2C+P%3BBell%2C+J+F%2C+III&rft.aulast=Cloutis&rft.aufirst=E&rft.date=2012-10-01&rft.volume=221&rft.issue=1&rft.spage=328&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.07.007 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 113 N1 - PubXState - NY N1 - Document feature - illus. incl. 7 tables N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2013-02-05 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - ALH 84028; Allan Hills Meteorites; Allende Meteorite; aqueous alteration; breccia; calcium-aluminum inclusions; carbon; carbonaceous chondrites; chondrites; chondrules; CV chondrites; Eh; grain size; Grosnaja Meteorite; inclusions; mafic composition; matrix; metamorphism; meteorites; modal analysis; nesosilicates; olivine; olivine group; opaque minerals; orthosilicates; oxides; parent bodies; petrography; reflectance; secondary minerals; silicates; spectra; spinel; stony meteorites; terrestrial environment; thermal metamorphism; Vigarano Meteorite; weathering DO - http://dx.doi.org/10.1016/j.icarus.2012.07.007 ER - TY - JOUR T1 - Origin of small pits in Martian impact craters AN - 1282822712; 2013-013896 AB - We propose a numerical model for the formation of the closely-spaced pits found in the thin, ejecta-related deposits superposed on the floors, interior terrace blocks, and near-rim ejecta blankets of well-preserved martian impact craters. Our model predicts the explosive degassing of water from this pitted material, which is assumed to originally be water-bearing, impact melt-rich breccia at the time of deposition. This process is analogous to what occurred in the fall-out suevite deposits at the Ries impact structure in Germany. At Ries, impact heating of water-bearing target material resulted in the rapid degassing of its water and other volatiles. The martian environment plays an important role in enhancing the effects of this degassing by increasing the flow-speed of the escaping gas. The high flow-rate of gas through particulate materials, such as suevite, tends to quickly form segregation channels or vent pipes, similar to those found in the Ries deposits. These pipes act as conduits for the efficient high-speed escape of the gas and small clasts that it entrains. Escaping gas and entrained clasts abraded and eroded the conduit walls, flaring them to form pits above a network of pipes. JF - Icarus AU - Boyce, Joseph M AU - Wilson, Lionel AU - Mouginis-Mark, Peter J AU - Hamilton, Christopher W AU - Tornabene, Livio L Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 262 EP - 275 PB - Elsevier, New York, NY VL - 221 IS - 1 SN - 0019-1035, 0019-1035 KW - impact features KW - water vapor KW - Mars KW - Europe KW - explosive eruptions KW - gravity field KW - Central Europe KW - metamorphic rocks KW - velocity KW - suevite KW - particulate materials KW - target materials KW - fallout KW - vents KW - degassing KW - water KW - breccia KW - numerical models KW - impactites KW - Bavaria Germany KW - pits KW - impact breccia KW - clasts KW - ejecta KW - gases KW - terrestrial planets KW - morphology KW - models KW - planets KW - Ries Crater KW - heating KW - atmospheric pressure KW - terrestrial comparison KW - impact craters KW - Germany KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282822712?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Origin+of+small+pits+in+Martian+impact+craters&rft.au=Boyce%2C+Joseph+M%3BWilson%2C+Lionel%3BMouginis-Mark%2C+Peter+J%3BHamilton%2C+Christopher+W%3BTornabene%2C+Livio+L&rft.aulast=Boyce&rft.aufirst=Joseph&rft.date=2012-10-01&rft.volume=221&rft.issue=1&rft.spage=262&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.07.027 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 92 N1 - PubXState - NY N1 - Document feature - illus. N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-02-05 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - atmospheric pressure; Bavaria Germany; breccia; Central Europe; clasts; degassing; ejecta; Europe; explosive eruptions; fallout; gases; Germany; gravity field; heating; impact breccia; impact craters; impact features; impactites; Mars; metamorphic rocks; models; morphology; numerical models; particulate materials; pits; planets; Ries Crater; suevite; target materials; terrestrial comparison; terrestrial planets; velocity; vents; water; water vapor DO - http://dx.doi.org/10.1016/j.icarus.2012.07.027 ER - TY - JOUR T1 - On the propagation of statistical model parameter uncertainty in CFD calculations AN - 1221887850; 17318947 AB - This work considers a new class of finite-volume approximations for scalar and system nonlinear conservation laws with multiple sources of stochastic model parameter uncertainty. The deterministic propagation of model parameter uncertainty is achieved through the introduction of additional stochastic coordinates. Particular attention is given to the construction of specialized piecewise polynomial approximation spaces well suited to the high-order accurate approximation of solution discontinuities in both physical and stochastic dimensions without exhibiting Gibbs-like oscillations characteristic of polynomial approximation. The proposed discretization easily retrofits existing finite-volume CFD codes in use today. Numerical results are presented for inviscid Burgers equation with uncertain initial data as well as the compressible Reynolds-averaged Navier-Stokes equations with uncertain boundary data and turbulence model parameters. JF - Theoretical and Computational Fluid Dynamics AU - Barth, Timothy AD - NASA Ames Research Center, Moffett Field, CA, 94035, USA, Timothy.J.Barth@nasa.gov Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 435 EP - 457 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 26 IS - 5 SN - 0935-4964, 0935-4964 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Mathematical models KW - Hydrodynamics KW - Construction KW - Statistical models KW - turbulence KW - Model Studies KW - Navier-Stokes equations KW - Statistical Models KW - Boundaries KW - Fluid dynamics KW - Conservation KW - New classes KW - Q2 09183:Physics and chemistry KW - SW 6010:Structures UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1221887850?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Theoretical+and+Computational+Fluid+Dynamics&rft.atitle=On+the+propagation+of+statistical+model+parameter+uncertainty+in+CFD+calculations&rft.au=Barth%2C+Timothy&rft.aulast=Barth&rft.aufirst=Timothy&rft.date=2012-10-01&rft.volume=26&rft.issue=5&rft.spage=435&rft.isbn=&rft.btitle=&rft.title=Theoretical+and+Computational+Fluid+Dynamics&rft.issn=09354964&rft_id=info:doi/10.1007%2Fs00162-011-0221-2 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-02-01 N1 - Last updated - 2016-12-22 N1 - SubjectsTermNotLitGenreText - Mathematical models; Navier-Stokes equations; Statistical models; Fluid dynamics; New classes; Hydrodynamics; Construction; Statistical Models; Boundaries; Conservation; turbulence; Model Studies DO - http://dx.doi.org/10.1007/s00162-011-0221-2 ER - TY - JOUR T1 - On the expression of uncertainty intervals in engineering AN - 1221873585; 17318945 AB - The paper summarizes the terminology of the statistics and probability disciplines as they pertain to uncertainty quantification in engineering. JF - Theoretical and Computational Fluid Dynamics AU - Zang, Thomas A AD - NASA Langley Research Center, Hampton, VA, 23681-2199, USA, tzangmands@wildblue.net Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 403 EP - 414 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 26 IS - 5 SN - 0935-4964, 0935-4964 KW - Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Engineering KW - Statistics KW - Hydrodynamics KW - Fluid dynamics KW - SW 0810:General KW - Q2 09183:Physics and chemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1221873585?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Theoretical+and+Computational+Fluid+Dynamics&rft.atitle=On+the+expression+of+uncertainty+intervals+in+engineering&rft.au=Zang%2C+Thomas+A&rft.aulast=Zang&rft.aufirst=Thomas&rft.date=2012-10-01&rft.volume=26&rft.issue=5&rft.spage=403&rft.isbn=&rft.btitle=&rft.title=Theoretical+and+Computational+Fluid+Dynamics&rft.issn=09354964&rft_id=info:doi/10.1007%2Fs00162-012-0273-y LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-02-01 N1 - Last updated - 2016-12-22 N1 - SubjectsTermNotLitGenreText - Fluid dynamics; Engineering; Statistics; Hydrodynamics DO - http://dx.doi.org/10.1007/s00162-012-0273-y ER - TY - JOUR T1 - Virtual Guidance as a Tool to Obtain Diagnostic Ultrasound for Spaceflight and Remote Environments AN - 1171897981; 17335238 AB - Introduction: With missions planned to travel greater distances from Earth at ranges that make real-time two-way communication impractical, astronauts will be required to perform autonomous medical diagnostic procedures during future exploration missions. Virtual guidance is a form of just-in-time training developed to allow novice ultrasound operators to acquire diagnostically-adequate images of clinically relevant anatomical structures using a prerecorded audio/visual tutorial viewed in real-time. Methods: Individuals without previous experience in ultrasound were recruited to perform carotid artery (N=10) and ophthalmic (N=9) ultrasound examinations using virtual guidance as their only training tool. In the carotid group, each untrained operator acquired two-dimensional, pulsed and color Doppler of the carotid artery. In the ophthalmic group, operators acquired representative images of the anterior chamber of the eye, retina, optic nerve, and nerve sheath. Ultrasound image quality was evaluated by independent imaging experts. Results: Of the studies, 8 of the 10 carotid and 1 7 of 18 of the ophthalmic images (2 images collected per study) were judged to be diagnos-tically adequate. The quality of all but one of the ophthalmic images ranged from adequate to excellent. Discussion: Diagnostically-adequate carotid and ophthalmic ultrasound examinations can be obtained by previously untrained operators with assistance from only an audio/video tutorial viewed in real time while scanning. This form of just-in-time training, which can be applied to other examinations, represents an opportunity to acquire important information for NASA flight surgeons and researchers when trained medical personnel are not available or when remote guidance is impractical. JF - Aviation, Space, and Environmental Medicine AU - Martin, D S AU - Caine, T L AU - Matz, T AU - Lee, S M C AU - Stenger, M B AU - Sargsyan, A E AU - Platts, S H AD - 1290 Hercules Blvd, Houston, david.s.martin@nasa.gov Y1 - 2012/10// PY - 2012 DA - Oct 2012 SP - 995 EP - 1000 PB - Aerospace Medical Association, 320 S. Henry St. Alexandria VA 22314-3579 United States VL - 83 IS - 10 SN - 0095-6562, 0095-6562 KW - Health & Safety Science Abstracts KW - Travel KW - Optics KW - Communications KW - Eye KW - Training KW - Medical personnel KW - H 2000:Transportation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1171897981?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthsafetyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.atitle=Virtual+Guidance+as+a+Tool+to+Obtain+Diagnostic+Ultrasound+for+Spaceflight+and+Remote+Environments&rft.au=Martin%2C+D+S%3BCaine%2C+T+L%3BMatz%2C+T%3BLee%2C+S+M+C%3BStenger%2C+M+B%3BSargsyan%2C+A+E%3BPlatts%2C+S+H&rft.aulast=Martin&rft.aufirst=D&rft.date=2012-10-01&rft.volume=83&rft.issue=10&rft.spage=995&rft.isbn=&rft.btitle=&rft.title=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.issn=00956562&rft_id=info:doi/10.3357%2FASEM.3279.2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-11-01 N1 - Number of references - 13 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Travel; Optics; Communications; Eye; Training; Medical personnel DO - http://dx.doi.org/10.3357/ASEM.3279.2012 ER - TY - JOUR T1 - Land Surface Controls on Hydroclimatic Means and Variability AN - 1125239315; 17300692 AB - Hydroclimatic means and variability are determined in large part by the control of soil moisture on surface moisture fluxes, particularly evapotranspiration and runoff. This control is examined here using a simple water balance model and multidecadal observations covering the conterminous United States. Under the assumption that the relevant soil moisture-evapotranspiration and soil moisture-runoff relationships are, to first order, universal, the simple model illustrates the degree to which they interact to determine spatial distributions of hydroclimatic means and variability. In the process, the simple model provides estimates for the underlying relationships that operate in nature. The hydroclimatic sensitivities established with the simple water balance model can be used to evaluate more complex land surface models and to guide their further development, as demonstrated herein with an example. JF - Journal of Hydrometeorology AU - Koster, Randal D AU - Mahanama, Sarith PP AD - Global Modeling and Assimilation Office, NASA Goddard Space Flight Center, Greenbelt, Maryland Y1 - 2012/10// PY - 2012 DA - Oct 2012 SP - 1604 EP - 1620 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 13 IS - 5 SN - 1525-755X, 1525-755X KW - ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts KW - Moisture KW - Variability KW - Spatial distribution KW - Illustrations KW - Hydrologic Budget KW - Evapotranspiration KW - Soil Water KW - Spatial Distribution KW - Model Studies KW - Hydrometeorology KW - Water balance KW - USA KW - Hydrometeorological research KW - Water balance models KW - Moisture Content KW - Soil moisture-runoff relationships KW - Soil moisture KW - Runoff KW - SW 5010:Network design KW - Q2 09283:Soil mechanics KW - M2 556.16:Runoff (556.16) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125239315?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrometeorology&rft.atitle=Land+Surface+Controls+on+Hydroclimatic+Means+and+Variability&rft.au=Koster%2C+Randal+D%3BMahanama%2C+Sarith+PP&rft.aulast=Koster&rft.aufirst=Randal&rft.date=2012-10-01&rft.volume=13&rft.issue=5&rft.spage=1604&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrometeorology&rft.issn=1525755X&rft_id=info:doi/10.1175%2FJHM-D-12-050.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Number of references - 31 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Water balance; Illustrations; Evapotranspiration; Runoff; Hydrometeorological research; Spatial distribution; Water balance models; Soil moisture-runoff relationships; Soil moisture; Hydrometeorology; Moisture; Variability; Hydrologic Budget; Moisture Content; Soil Water; Spatial Distribution; Model Studies; USA DO - http://dx.doi.org/10.1175/JHM-D-12-050.1 ER - TY - JOUR T1 - Global Distribution of Extreme Precipitation and High-Impact Landslides in 2010 Relative to Previous Years AN - 1125239311; 17300691 AB - It is well known that extreme or prolonged rainfall is the dominant trigger of landslides worldwide. While research has evaluated the spatiotemporal distribution of extreme rainfall and landslides at local or regional scales using in situ data, few studies have mapped rainfall-triggered landslide distribution globally because of the dearth of landslide data and consistent precipitation information. This study uses a newly developed global landslide catalog (GLC) and a 13-yr satellite-based precipitation record from Tropical Rainfall Measuring Mission (TRMM) data. For the first time, these two unique products provide the foundation to quantitatively evaluate the co-occurrence of precipitation and rainfall-triggered landslides globally. Evaluation of the GLC indicates that 2010 had a large number of high-impact landslide events relative to previous years. This study considers how variations in extreme and prolonged satellite-based rainfall are related to the distribution of landslides over the same time scales for three active landslide areas: Central America, the Himalayan arc, and central eastern China. Several test statistics confirm that TRMM rainfall generally scales with the observed increase in landslide reports and fatal events for 2010 and previous years over each region. These findings suggest that the co-occurrence of satellite precipitation and landslide reports may serve as a valuable indicator for characterizing the spatiotemporal distribution of landslide-prone areas in order to establish a global rainfall-triggered landslide climatology. This study characterizes the variability of satellite precipitation data and reported landslide activity at the global scale in order to improve landslide cataloging and attempt to quantify landslide triggering at daily, monthly, and yearly time scales. JF - Journal of Hydrometeorology AU - Kirschbaum, Dalia AU - Adler, Robert AU - Adler, David AU - Peters-Lidard, Christa AU - Huffman, George AD - NASA Goddard Space Flight Center, Greenbelt, Maryland Y1 - 2012/10// PY - 2012 DA - Oct 2012 SP - 1536 EP - 1551 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 13 IS - 5 SN - 1525-755X, 1525-755X KW - Aqualine Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts KW - Remote Sensing KW - Precipitation data KW - Statistics KW - Rainfall KW - Statistical analysis KW - Catalogues KW - Climatology KW - Hydrologic Data KW - Satellite Technology KW - Rainfall Distribution KW - Precipitation KW - Landslides KW - Satellite data KW - Hydrometeorological research KW - Precipitation variability KW - Tropical Rainfall Measuring Mission (TRMM) KW - China, People's Rep. KW - Central America KW - Q2 09243:Structure, mechanics and thermodynamics KW - SW 5080:Evaluation, processing and publication KW - AQ 00005:Underground Services and Water Use KW - M2 551.579.1:Water supply from precipitation (551.579.1) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125239311?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrometeorology&rft.atitle=Global+Distribution+of+Extreme+Precipitation+and+High-Impact+Landslides+in+2010+Relative+to+Previous+Years&rft.au=Kirschbaum%2C+Dalia%3BAdler%2C+Robert%3BAdler%2C+David%3BPeters-Lidard%2C+Christa%3BHuffman%2C+George&rft.aulast=Kirschbaum&rft.aufirst=Dalia&rft.date=2012-10-01&rft.volume=13&rft.issue=5&rft.spage=1536&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrometeorology&rft.issn=1525755X&rft_id=info:doi/10.1175%2FJHM-D-12-02.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Number of references - 55 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Landslides; Catalogues; Climatology; Precipitation data; Hydrometeorological research; Satellite data; Statistical analysis; Precipitation variability; Tropical Rainfall Measuring Mission (TRMM); Precipitation; Remote Sensing; Satellite Technology; Statistics; Rainfall; Rainfall Distribution; Hydrologic Data; China, People's Rep.; Central America DO - http://dx.doi.org/10.1175/JHM-D-12-02.1 ER - TY - JOUR T1 - Assessing Satellite-Based Rainfall Estimates in Semiarid Watersheds Using the USDA-ARS Walnut Gulch Gauge Network and TRMM PR AN - 1125239298; 17300690 AB - The rain gauge network associated with the Walnut Gulch Experimental Watershed (WGEW) in southeastern Arizona provides a unique opportunity for direct comparisons of in situ measurements and satellite-based instantaneous rain rate estimates like those from the Tropical Rainfall Measuring Mission (TRMM) precipitation radar (PR). The WGEW network is the densest rain gauge network in the PR coverage area for watersheds greater than 10 km super(2). It consists of 88 weighing rain gauges within a 149-km super(2) area. On average, approximately 10 gauges can be found in each PR field of view ( similar to 5-km diameter). All gauges are very well synchronized with 1-min reporting intervals. This allows generating very-high-temporal-resolution rain rate fields and obtaining accurate estimates of the area-average rain rate for the entire watershed and for a single PR field of view. In this study, instantaneous rain rate fields from the PR and the spatially interpolated gauge measurements (on a 100 m 100 m grid, updated every 1 min) are compared for all TRMM overpasses in which the PR recorded rain within the WGEW boundaries (25 overpasses during 1999-2010). The results indicate very good agreement between the fields with low bias values (0.9). The correlation is high at overpass time but the peak occurs several minutes after the overpass, which can be explained by the fact that it takes several minutes for the raindrops to reach the gauge from the time they are observed by the PR. The correlation improves with the new version of the TRMM algorithm (V7). The study includes assessment of the accuracy of the reference products. JF - Journal of Hydrometeorology AU - Amitai, Eyal AU - Unkrich, Carl L AU - Goodrich, David C AU - Habib, Emad AU - Thill, Bryson AD - NASA Goddard Space Flight Center, Greenbelt, Maryland, and Chapman University, Orange, California Y1 - 2012/10// PY - 2012 DA - Oct 2012 SP - 1579 EP - 1588 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 13 IS - 5 SN - 1525-755X, 1525-755X KW - Aqualine Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts KW - Rainfall KW - Correlations KW - Algorithms KW - Watersheds KW - Experimental Basins KW - Assessments KW - Networks KW - Rain gauge networks KW - Experimental watersheds KW - Rain gauges KW - Mathematical models KW - Juglans KW - Precipitation KW - Satellite data KW - Hydrometeorological research KW - Rain Gages KW - Boundaries KW - USA, Arizona KW - Tropical Rainfall Measuring Mission (TRMM) KW - Rain KW - Q2 09243:Structure, mechanics and thermodynamics KW - SW 5010:Network design KW - AQ 00005:Underground Services and Water Use KW - M2 551.579.1:Water supply from precipitation (551.579.1) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125239298?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrometeorology&rft.atitle=Assessing+Satellite-Based+Rainfall+Estimates+in+Semiarid+Watersheds+Using+the+USDA-ARS+Walnut+Gulch+Gauge+Network+and+TRMM+PR&rft.au=Amitai%2C+Eyal%3BUnkrich%2C+Carl+L%3BGoodrich%2C+David+C%3BHabib%2C+Emad%3BThill%2C+Bryson&rft.aulast=Amitai&rft.aufirst=Eyal&rft.date=2012-10-01&rft.volume=13&rft.issue=5&rft.spage=1579&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrometeorology&rft.issn=1525755X&rft_id=info:doi/10.1175%2FJHM-D-12-016.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Number of references - 17 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Mathematical models; Rain gauges; Rainfall; Watersheds; Experimental watersheds; Rain gauge networks; Hydrometeorological research; Satellite data; Algorithms; Correlations; Tropical Rainfall Measuring Mission (TRMM); Precipitation; Experimental Basins; Assessments; Rain Gages; Boundaries; Networks; Rain; Juglans; USA, Arizona DO - http://dx.doi.org/10.1175/JHM-D-12-016.1 ER - TY - JOUR T1 - Roles of Urban Tree Canopy and Buildings in Urban Heat Island Effects: Parameterization and Preliminary Results AN - 1125238275; 17300672 AB - Urban heat island (UHI) effects can strengthen heat waves and air pollution episodes. In this study, the dampening impact of urban trees on the UHI during an extreme heat wave in the Washington, D.C., and Baltimore, Maryland, metropolitan area is examined by incorporating trees, soil, and grass into the coupled Weather Research and Forecasting model and an urban canopy model (WRF-UCM). By parameterizing the effects of these natural surfaces alongside roadways and buildings, the modified WRF-UCM is used to investigate how urban trees, soil, and grass dampen the UHI. The modified model was run with 50% tree cover over urban roads and a 10% decrease in the width of urban streets to make space for soil and grass alongside the roads and buildings. Results show that, averaged over all urban areas, the added vegetation decreases surface air temperature in urban street canyons by 4.1 K and road-surface and building-wall temperatures by 15.4 and 8.9 K, respectively, as a result of tree shading and evapotranspiration. These temperature changes propagate downwind and alter the temperature gradient associated with the Chesapeake Bay breeze and, therefore, alter the strength of the bay breeze. The impact of building height on the UHI shows that decreasing commercial building heights by 8 m and residential building heights by 2.5 m results in up to 0.4-K higher daytime surface and near-surface air temperatures because of less building shading and up to 1.2-K lower nighttime temperatures because of less longwave radiative trapping in urban street canyons. JF - Journal of Applied Meteorology and Climatology AU - Loughner, Christopher P AU - Allen, Dale J AU - Zhang, Da-Lin AU - Pickering, Kenneth E AU - Dickerson, Russell R AU - Landry, Laura AD - Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, and NASA Goddard Space Flight Center, Greenbelt, Maryland Y1 - 2012/10// PY - 2012 DA - Oct 2012 SP - 1775 EP - 1793 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 51 IS - 10 SN - 1558-8424, 1558-8424 KW - Sustainability Science Abstracts; Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - Temperature changes KW - Airflow in street canyons KW - Trees KW - Grasses KW - Temperature KW - USA, Maryland, Baltimore KW - Urban heat islands KW - ANW, USA, Chesapeake Bay KW - Buildings KW - Soil KW - USA, Washington KW - Urban microclimatology KW - Street canyon temperatures KW - Urban atmospheric pollution KW - Climatology KW - Canopies KW - Canyons KW - Street microclimates KW - Heat waves KW - Shading KW - P 0000:AIR POLLUTION KW - M3 1010:Issues in Sustainable Development KW - M2 556.13:Evaporation/Evapotranspiration (556.13) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125238275?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Applied+Meteorology+and+Climatology&rft.atitle=Roles+of+Urban+Tree+Canopy+and+Buildings+in+Urban+Heat+Island+Effects%3A+Parameterization+and+Preliminary+Results&rft.au=Loughner%2C+Christopher+P%3BAllen%2C+Dale+J%3BZhang%2C+Da-Lin%3BPickering%2C+Kenneth+E%3BDickerson%2C+Russell+R%3BLandry%2C+Laura&rft.aulast=Loughner&rft.aufirst=Christopher&rft.date=2012-10-01&rft.volume=51&rft.issue=10&rft.spage=1775&rft.isbn=&rft.btitle=&rft.title=Journal+of+Applied+Meteorology+and+Climatology&rft.issn=15588424&rft_id=info:doi/10.1175%2FJAMC-D-11-0228.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Number of references - 47 N1 - Last updated - 2013-07-15 N1 - SubjectsTermNotLitGenreText - Temperature changes; Airflow in street canyons; Urban microclimatology; Street canyon temperatures; Urban atmospheric pollution; Climatology; Urban heat islands; Heat waves; Street microclimates; Soil; Grasses; Trees; Temperature; Canyons; Canopies; Shading; Buildings; USA, Washington; USA, Maryland, Baltimore; ANW, USA, Chesapeake Bay DO - http://dx.doi.org/10.1175/JAMC-D-11-0228.1 ER - TY - JOUR T1 - Flow-dependent empirical singular vector with an ensemble Kalman filter data assimilation for El Nino prediction AN - 1125235179; 17288454 AB - In this study, a new approach for extracting flow-dependent empirical singular vectors (FESVs) for seasonal prediction using ensemble perturbations obtained from an ensemble Kalman filter (EnKF) assimilation is presented. Due to the short interval between analyses, EnKF perturbations primarily contain instabilities related to fast weather variability. To isolate slower, coupled instabilities that would be more suitable for seasonal prediction, an empirical linear operator for seasonal time-scales (i.e. several months) is formulated using a causality hypothesis; then, the most unstable mode from the linear operator is extracted for seasonal time-scales. It is shown that the flow-dependent operator represents nonlinear integration results better than a conventional empirical linear operator static in time. Through 20 years of retrospective seasonal predictions, it is shown that the skill of forecasting equatorial SST anomalies using the FESV is systematically improved over that using Conventional ESV (CESV). For example, the correlation skill of the NINO3 SST index using FESV is higher, by about 0.1, than that of CESV at 8-month leads. In addition, the forecast skill improvement is significant over the locations where the correlation skill of conventional methods is relatively low, indicating that the FESV is effective where the initial uncertainty is large. JF - Climate Dynamics AU - Ham, Yoo-Geun AU - Rienecker, Michele M AD - Global Modeling and Assimilation Office, NASA/GSFC Code 610.1, Greenbelt, MD, USA, yoo-geun.ham@nasa.gov Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 1727 EP - 1738 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 39 IS - 7-8 SN - 0930-7575, 0930-7575 KW - Oceanic Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts KW - Prediction KW - Kalman Filters KW - Weather KW - Variability KW - Climates KW - Correlations KW - Kalman filter KW - Kalman filters KW - Vectors KW - Data assimilation KW - Sea surface temperature anomalies KW - El Nino KW - Forecasting KW - Sea surface temperature forecasting KW - Instability KW - Q2 09243:Structure, mechanics and thermodynamics KW - SW 5010:Network design KW - M2 551.588:Environmental Influences (551.588) KW - O 2070:Meteorology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1125235179?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Climate+Dynamics&rft.atitle=Flow-dependent+empirical+singular+vector+with+an+ensemble+Kalman+filter+data+assimilation+for+El+Nino+prediction&rft.au=Ham%2C+Yoo-Geun%3BRienecker%2C+Michele+M&rft.aulast=Ham&rft.aufirst=Yoo-Geun&rft.date=2012-10-01&rft.volume=39&rft.issue=7-8&rft.spage=1727&rft.isbn=&rft.btitle=&rft.title=Climate+Dynamics&rft.issn=09307575&rft_id=info:doi/10.1007%2Fs00382-012-1302-7 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2016-04-29 N1 - SubjectsTermNotLitGenreText - Prediction; El Nino; Kalman filters; Vectors; Sea surface temperature anomalies; Kalman filter; Correlations; Instability; Data assimilation; Sea surface temperature forecasting; Weather; Kalman Filters; Variability; Climates; Forecasting DO - http://dx.doi.org/10.1007/s00382-012-1302-7 ER - TY - JOUR T1 - A general moment NRIXS approach to the determination of equilibrium Fe isotopic fractionation factors; application to goethite and jarosite AN - 1124740853; 2012-095621 AB - The equilibrium Fe isotopic fractionation factors of goethite and jarosite have considerable importance for interpreting Fe isotope variations in low temperature aqueous systems on Earth and possibly Mars in the context of future sample return missions. We measured the beta -factors of goethite FeO(OH), potassium-jarosite KFe (sub 3) (SO (sub 4) ) (sub 2) (OH) (sub 6) , and hydronium-jarosite (H (sub 3) O)Fe (sub 3) (SO (sub 4) ) (sub 2) (OH) (sub 6) , by Nuclear Resonant Inelastic X-ray Scattering (NRIXS, also known as Nuclear Resonance Vibrational Spectroscopy - NRVS or Nuclear Inelastic Scattering - NIS) at the Advanced Photon Source. These measurements were made on synthetic minerals enriched in (super 57) Fe. A new method (i.e., the general moment approach) is presented to calculate beta -factors from the moments of the NRIXS spectrum S(E). The first term in the moment expansion controls iron isotopic fractionation at high temperature and corresponds to the mean force constant of the iron bonds, a quantity that is readily measured and often reported in NRIXS studies. The mean force constants of goethite, potassium-jarosite, and hydronium-jarosite are 314+ or -14, 264+ or -12, and 310+ or -14 N/m, respectively (uncertainties include statistical and systematic errors). The general moment approach gives (super 56) Fe/ (super 54) Fe beta -factors of 9.7, 8.3, and 9.5 ppm at 22 degrees C for these minerals. The beta -factor of goethite measured by NRIXS is larger than that estimated by combining results from laboratory exchange experiments and calculations based on electronic structure theory. Similar issues have been identified previously for other pairs of mineral-aqueous species, which could reflect inadequacies of approaches based on electronic structure theory to calculate absolute beta -factors (differences in beta -factors between aqueous species may be more accurate) or failure of laboratory experiments to measure mineral-fluid equilibrium isotopic fractionation at low temperature. We apply the force constant approach to published NRIXS data and report 1000Xlnbeta for important Fe-bearing phases of geological and biochemical relevance such as myoglobin, cytochrome f, pyroxene, metal, troilite, chalcopyrite, hematite, and magnetite. Abstract Copyright (2012) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Dauphas, N AU - Roskosz, M AU - Alp, E E AU - Golden, D C AU - Sio, C K AU - Tissot, F L H AU - Hu, M Y AU - Zhao, J AU - Gao, L AU - Morris, R V Y1 - 2012/10/01/ PY - 2012 DA - 2012 Oct 01 SP - 254 EP - 275 PB - Elsevier, New York, NY VL - 94 SN - 0016-7037, 0016-7037 KW - methods KW - nuclear resonant inelastic X-ray scattering KW - isotope fractionation KW - chemical analysis KW - goethite KW - sulfates KW - isotopes KW - isotope ratios KW - stable isotopes KW - iron KW - jarosite KW - phase equilibria KW - metals KW - mathematical methods KW - oxides KW - spectra KW - Fe-56/Fe-54 KW - crystal chemistry KW - chemical composition KW - 02D:Isotope geochemistry KW - 01C:Mineralogy of non-silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1124740853?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=A+general+moment+NRIXS+approach+to+the+determination+of+equilibrium+Fe+isotopic+fractionation+factors%3B+application+to+goethite+and+jarosite&rft.au=Dauphas%2C+N%3BRoskosz%2C+M%3BAlp%2C+E+E%3BGolden%2C+D+C%3BSio%2C+C+K%3BTissot%2C+F+L+H%3BHu%2C+M+Y%3BZhao%2C+J%3BGao%2C+L%3BMorris%2C+R+V&rft.aulast=Dauphas&rft.aufirst=N&rft.date=2012-10-01&rft.volume=94&rft.issue=&rft.spage=254&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2012.06.013 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 68 N1 - PubXState - NY N1 - Document feature - illus. incl. 2 tables N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-11-01 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - chemical analysis; chemical composition; crystal chemistry; Fe-56/Fe-54; goethite; iron; isotope fractionation; isotope ratios; isotopes; jarosite; mathematical methods; metals; methods; nuclear resonant inelastic X-ray scattering; oxides; phase equilibria; spectra; stable isotopes; sulfates DO - http://dx.doi.org/10.1016/j.gca.2012.06.013 ER - TY - JOUR T1 - Late-glacial and Holocene vegetation and climate variability, including major droughts, in the Sky Lakes region of southeastern New York State AN - 1124739750; 2012-094289 AB - Sediment cores from Lakes Minnewaska and Mohonk in the Shawangunk Mountains of southeastern New York were analyzed for pollen, plant macrofossils, macroscopic charcoal, organic carbon content, carbon isotopic composition, carbon/nitrogen ratio, and lithologic changes to determine the vegetation and landscape history of the greater Catskill Mountain region since deglaciation. Pollen stratigraphy generally matches the New England pollen zones identified by Deevey (1939) and Davis (1969), with boreal genera (Picea, Abies) present during the late Pleistocene yielding to a mixed Pinus, Quercus and Tsuga forest in the early Holocene. Lake Minnewaska sediments record the Younger Dryas and possibly the 8.2 cal kyr BP climatic events in pollen and sediment chemistry along with an approximately 1400 cal yr interval of wet conditions (increasing Tsuga and declining Quercus) centered about 6400 cal yr BP. Both Minnewaska and Mohonk reveal a protracted drought interval in the middle Holocene, approximately 5700-4100 cal yr BP, during which Pinus rigida colonized the watershed, lake levels fell, and frequent fires led to enhanced hillslope erosion. Together, the records show at least three wet-dry cycles throughout the Holocene and both similarities and differences to climate records in New England and central New York. Drought intervals raise concerns for water resources in the New York City metropolitan area and may reflect a combination of enhanced La Nina, negative phase NAO, and positive phase PNA climatic patterns and/or northward shifts of storm tracks. JF - Palaeogeography, Palaeoclimatology, Palaeoecology AU - Menking, Kirsten M AU - Peteet, Dorothy M AU - Anderson, Roger Y Y1 - 2012/10/01/ PY - 2012 DA - 2012 Oct 01 SP - 45 EP - 59 PB - Elsevier, Amsterdam VL - 353-355 SN - 0031-0182, 0031-0182 KW - United States KW - terrestrial environment KW - isotopes KW - Appalachians KW - vegetation KW - paleoclimatology KW - Holocene KW - stable isotopes KW - cores KW - climate change KW - paleoecology KW - drought KW - upper Pleistocene KW - Ulster County New York KW - southeastern New York KW - Cenozoic KW - radioactive isotopes KW - pollen KW - paleolimnology KW - dates KW - carbon KW - glacial environment KW - sediments KW - Minnewaska Lake KW - chemostratigraphy KW - absolute age KW - miospores KW - pollen analysis KW - organic carbon KW - Mohonk Lake KW - North America KW - charcoal KW - Quaternary KW - biostratigraphy KW - isotope ratios KW - C-13/C-12 KW - Shawangunk Mountains KW - Sky Lakes KW - New York KW - palynomorphs KW - lacustrine environment KW - Pleistocene KW - C-14 KW - lake sediments KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1124739750?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Palaeogeography%2C+Palaeoclimatology%2C+Palaeoecology&rft.atitle=Late-glacial+and+Holocene+vegetation+and+climate+variability%2C+including+major+droughts%2C+in+the+Sky+Lakes+region+of+southeastern+New+York+State&rft.au=Menking%2C+Kirsten+M%3BPeteet%2C+Dorothy+M%3BAnderson%2C+Roger+Y&rft.aulast=Menking&rft.aufirst=Kirsten&rft.date=2012-10-01&rft.volume=353-355&rft.issue=&rft.spage=45&rft.isbn=&rft.btitle=&rft.title=Palaeogeography%2C+Palaeoclimatology%2C+Palaeoecology&rft.issn=00310182&rft_id=info:doi/10.1016%2Fj.palaeo.2012.06.033 L2 - http://www.sciencedirect.com/science/journal/00310182 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 87 N1 - Document feature - illus. incl. 2 tables, sketch map N1 - Last updated - 2012-11-01 N1 - CODEN - PPPYAB N1 - SubjectsTermNotLitGenreText - absolute age; Appalachians; biostratigraphy; C-13/C-12; C-14; carbon; Cenozoic; charcoal; chemostratigraphy; climate change; cores; dates; drought; glacial environment; Holocene; isotope ratios; isotopes; lacustrine environment; lake sediments; Minnewaska Lake; miospores; Mohonk Lake; New York; North America; organic carbon; paleoclimatology; paleoecology; paleolimnology; palynomorphs; Pleistocene; pollen; pollen analysis; Quaternary; radioactive isotopes; sediments; Shawangunk Mountains; Sky Lakes; southeastern New York; stable isotopes; terrestrial environment; Ulster County New York; United States; upper Pleistocene; vegetation DO - http://dx.doi.org/10.1016/j.palaeo.2012.06.033 ER - TY - JOUR T1 - Development of a Web-based visualization platform for climate research using Google Earth AN - 1112671313; 2012-091961 AB - Recently, it has become easier to access climate data from satellites, ground measurements, and models from various data centers. However, searching, accessing, and processing heterogeneous data from different sources are very time-consuming tasks. There is lack of a comprehensive visual platform to acquire distributed and heterogeneous scientific data and to render processed images from a single accessing point for climate studies. This paper documents the design and implementation of a Web-based visual, interoperable, and scalable platform that is able to access climatological fields from models, satellites, and ground stations from a number of data sources using Google Earth (GE) as a common graphical interface. The development is based on the TCP/IP protocol and various data sharing open sources, such as OPeNDAP, GDS, Web Processing Service (WPS), and Web Mapping Service (WMS). The visualization capability of integrating various measurements into GE extends dramatically the awareness and visibility of scientific results. Using embedded geographic information in the GE, the designed system improves our understanding of the relationships of different elements in a four-dimensional domain. The system enables easy and convenient synergistic research on a virtual platform for professionals and the general public, greatly advancing global data sharing and scientific research collaboration. JF - Computers & Geosciences AU - Sun, Xiaojuan AU - Shen, Suhung AU - Leptoukh, Gregory G AU - Wang, Panxing AU - Di, Liping AU - Lu, Mingyue Y1 - 2012/10// PY - 2012 DA - October 2012 SP - 160 EP - 168 PB - Elsevier, Amsterdam VL - 47 SN - 0098-3004, 0098-3004 KW - Far East KW - Yangtze River KW - data processing KW - urbanization KW - World Wide Web KW - environmental effects KW - climate change KW - visualization KW - monsoons KW - Nanjing China KW - Google Earth KW - computer networks KW - Asia KW - meteorology KW - climate KW - China KW - monitoring KW - rainfall KW - Jiangsu China KW - human activity KW - satellite methods KW - research KW - measurement KW - models KW - aerosols KW - Internet KW - remote sensing KW - 20:Applied geophysics KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1112671313?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Computers+%26+Geosciences&rft.atitle=Development+of+a+Web-based+visualization+platform+for+climate+research+using+Google+Earth&rft.au=Sun%2C+Xiaojuan%3BShen%2C+Suhung%3BLeptoukh%2C+Gregory+G%3BWang%2C+Panxing%3BDi%2C+Liping%3BLu%2C+Mingyue&rft.aulast=Sun&rft.aufirst=Xiaojuan&rft.date=2012-10-01&rft.volume=47&rft.issue=&rft.spage=160&rft.isbn=&rft.btitle=&rft.title=Computers+%26+Geosciences&rft.issn=00983004&rft_id=info:doi/10.1016%2Fj.cageo.2011.09.010 L2 - http://www.sciencedirect.com/science?_ob=JournalURL&_cdi=5840&_auth=y&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=e5198452fad934c6346f38b57511c8e0 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 20 N1 - Document feature - illus. N1 - SuppNotes - Includes appendices N1 - Last updated - 2012-10-18 N1 - CODEN - GGEOD5 N1 - SubjectsTermNotLitGenreText - aerosols; Asia; China; climate; climate change; computer networks; data processing; environmental effects; Far East; Google Earth; human activity; Internet; Jiangsu China; measurement; meteorology; models; monitoring; monsoons; Nanjing China; rainfall; remote sensing; research; satellite methods; urbanization; visualization; World Wide Web; Yangtze River DO - http://dx.doi.org/10.1016/j.cageo.2011.09.010 ER - TY - RPRT T1 - SOUNDING ROCKETS PROGRAM AT POKER FLAT RESEARCH RANGE, ALASKA. AN - 1312656064; 15505 AB - PURPOSE: The continuation of the National Aeronautics and Space Administration (NASA) Sounding Rockets Program (SRP) at Poker Flat Research Range (PFRR), outside of Fairbanks, Alaska is assessed. Owned and operated by the University of Alaska Fairbanks since 1968, the PFRR is a launch facility for sounding rockets, which carry scientific instruments into regions of the upper atmosphere and space. The primary types of missions conducted by NASA at PFRR are in partnership with university scientists who study the earth's atmosphere and its interaction with the space environment. The PFRR is located northeast of the unincorporated village of Chatanika, Alaska and consists of 5,200 acres of land that house rocket and support facilities, launch pads, and tracking infrastructure. Directly north of the PFRR facility are its downrange flight zones, over which rockets are launched and within which spent stages and payloads impact the ground. Within these flight zones are Steese National Conservation Area and White Mountain National Recreational Area, and the Arctic and Yukon Flats National Wildlife Refuges. Historically, the Bureau of Land Management and the Fish and Wildlife Service have issued special-use authorizations and agreements for impact of rockets and recovery operations on these lands. This draft EIS tiers from the programmatic 2000 SRP final supplemental EIS and considers five alternatives for continued operations at PFRR. Under the No Action Alternative, the SRP would continue in its present form and no significant efforts would be taken to recover spent stages unless desired for programmatic reasons, and payloads would only be recovered if required by the scientists. Alternative 1 would include enhanced efforts to locate new and existing spent stages and payloads within the PFRR flight corridor. Some items or parts thereof could be left in the field if the landowners agree that attempted recovery could cause more damage to the environment than leaving it in place. Alternative 2 is the same as Alternative 1, except maximum practicable effort would be exerted to fully recover newly expended and existing spent stages and payloads if it is determined that they can be recovered safely, even if the efforts result in longer-term recovery-related environmental impacts. Alternative 3 is the same as Alternative 1, except trajectories of future sounding rocket missions would be restricted such that planned impacts would not be permitted within designated Wild and Scenic River corridors. The restriction would be an extension of the existing prohibition on having planned impacts within Mollie Beattie Wilderness Area. Alternative 4 would include maximum cleanup search and recovery as well as the restrictions on flight trajectories. Under all alternatives, the anticipated launch schedule at PFRR would remain an average of four launches annually. POSITIVE IMPACTS: Mitigation measures and recovery of spent stages and payloads would protect sensitive environments while NASA continues to obtain the requisite earth and space science data afforded by high-latitude sounding rocket launches in support of its science and educational missions. NEGATIVE IMPACTS: Routine operations would continue to have minor adverse impacts with respect to air quality and noise, and launch operations would require the use of small quantities of potentially hazardous materials, some of which would land within downrange properties. Under Alternatives 1 and 3, the additional efforts to recover flight hardware could result in isolated soil disturbances; however, all recovery efforts would be conducted in an environmentally sensitive manner. Any adverse impacts from launch operations on wildlife would be similar for all alternatives and would be local, short-term, and negligible. LEGAL MANDATES: Federal Land Policy and Management Act of 1976 (43 U.S.C. 1701 et seq.) and National Wildlife Refuge System Administration Act (P.L. 94-233). PRIOR REFERENCES: For the abstract of the programmatic final supplemental EIS on the NASA Sounding Rockets Program, see 00-0207F, Volume 24, Number 2. JF - EPA number: 120308, Draft EIS--530 pages, Appendices--272 pages, September 28, 2012 PY - 2012 KW - Air Transportation KW - Aerospace KW - Aircraft KW - Biologic Assessments KW - Hazardous Wastes KW - Preserves KW - Research KW - Research Facilities KW - Spacecraft KW - Waste Management KW - Wild and Scenic Rivers KW - Wilderness KW - Wildlife Habitat KW - Alaska KW - Arctic National Wildlife Refuge KW - Yukon Flats National Wildlife Refuge KW - Federal Land Policy and Management Act of 1976, Compliance KW - National Wildlife Refuge System Administration Act of 1966, Compliance UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1312656064?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/Environmental+Impact+Statements%3A+Digests&rft_val_fmt=info:ofi/fmt:kev:mtx:book&rft.genre=report&rft.jtitle=&rft.atitle=&rft.au=&rft.aulast=&rft.aufirst=&rft.date=2012-09-28&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=SOUNDING+ROCKETS+PROGRAM+AT+POKER+FLAT+RESEARCH+RANGE%2C+ALASKA.&rft.title=SOUNDING+ROCKETS+PROGRAM+AT+POKER+FLAT+RESEARCH+RANGE%2C+ALASKA.&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Name - National Aeronautics and Space Administration, Sounding Rockets Program Office, Wallops Island, Virginia; NASA N1 - Date revised - 2013-02-01 N1 - SuppNotes - Draft. Preparation date: September 28, 2012 N1 - Last updated - 2013-02-27 ER - TY - JOUR T1 - The use of satellite-measured aerosol optical depth to constrain biomass burning emissions source strength in the global model GOCART AN - 1238116343; 17255674 AB - Simulations of biomass burning (BB) emissions in chemistry transport models strongly depend on the inventories that define emission source location and strength. We use 13 global biomass burning emission estimates, including the widely used Global Fire Emission Database (GFED) monthly and daily versions, Fire Radiative Power (FRP)-based Quick Fire Emission Data set QFED, and 11 calculated emissions from different combinations of burned area based on the Moderate Resolution Imaging Spectroradiometer (MODIS) products, effective fuel load, and species emission factors as alternative inputs to the global Goddard Chemistry Aerosol Radiation and Transport (GOCART) model. The resultant simulated aerosol optical depth (AOD) and its spatial distribution are compared to AOD snapshots measured by the MODIS instrument for 124 fire events occurring between 2006 and 2007. This comparison exposes the regional biases of each emission option. GOCART average fire AOD values compare best to MODIS-measured AOD when the daily GFED inventory is used as input to GOCART. Even though GFED-based emission options provide the lowest emissions in the tropics, GFED-based GOCART AOD compares best with MODIS AOD in tropical cases. Fire-counts-based emission options give the largest emission estimates in the boreal regions, and the model performs best at higher latitudes with these inputs when compared to MODIS. Comparison of total annual BB emissions by all inventories suggests that burned area estimates are usually the largest source of disagreement. It is also shown that the quantitative relationship between BB aerosol emission rate and model-simulated AOD is related to the horizontal plume dispersion, which can be approximated by the wind speed in the planetary boundary layer in most cases. Thus, given average wind speed of the smoke plume environment, MODIS-measured AOD can provide a constraint to the strength of BB sources at the level of individual plumes. JF - Journal of Geophysical Research. Atmospheres AU - Petrenko, Mariya AU - Kahn, Ralph AU - Chin, Mian AU - Soja, Amber AU - Kucsera, Tom AD - Earth Science Directorate, NASA Goddard Space Flight Center, Greenbelt, Maryland, USA~~ Universities Space Research Association (USRA), Columbia, Maryland, USA Y1 - 2012/09/26/ PY - 2012 DA - 2012 Sep 26 PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 117 IS - D18 SN - 2169-897X, 2169-897X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - Fires KW - Aerosols KW - Atmospheric pollution models KW - Spatial distribution KW - Combustion products KW - Velocity KW - Smoke plumes KW - Biomass KW - Optical analysis KW - Wind speed KW - Satellite data KW - Radiation KW - Emissions KW - MODIS (Moderate Resolution Imaging Spectrometer) KW - Optical depth of aerosols KW - Burning KW - Plumes KW - M2 551.510.42:Air Pollution (551.510.42) KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1238116343?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research.+Atmospheres&rft.atitle=The+use+of+satellite-measured+aerosol+optical+depth+to+constrain+biomass+burning+emissions+source+strength+in+the+global+model+GOCART&rft.au=Petrenko%2C+Mariya%3BKahn%2C+Ralph%3BChin%2C+Mian%3BSoja%2C+Amber%3BKucsera%2C+Tom&rft.aulast=Petrenko&rft.aufirst=Mariya&rft.date=2012-09-26&rft.volume=117&rft.issue=D18&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research.+Atmospheres&rft.issn=2169897X&rft_id=info:doi/10.1029%2F2012JD017870 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-12-01 N1 - Number of references - 99 N1 - Last updated - 2014-04-17 N1 - SubjectsTermNotLitGenreText - Wind speed; Fires; Satellite data; Atmospheric pollution models; Radiation; Spatial distribution; Optical depth of aerosols; MODIS (Moderate Resolution Imaging Spectrometer); Smoke plumes; Optical analysis; Aerosols; Combustion products; Emissions; Velocity; Burning; Biomass; Plumes DO - http://dx.doi.org/10.1029/2012JD017870 ER - TY - JOUR T1 - WISE detections of dust in the habitable zones of planet-bearing stars AN - 1660632105; 2015-018154 AB - We use data from the Wide-field Infrared Survey Explorer (WISE) all-sky release to explore the incidence of warm dust in the habitable zones around exoplanet-host stars. Dust emission at 12 and/or 22 mu m (T (sub dust) approximately 300 and/or approximately 150 K) traces events in the terrestrial planet zones; its existence implies replenishment by evaporation of comets or collisions of asteroids, possibly stirred by larger planets. Of the 591 planetary systems (728 extrasolar planets) in the Exoplanet Encyclopaedia as of 2012 January 31, 350 are robustly detected by WISE at > or =5sigma level. We perform detailed photosphere subtraction using tools developed for Spitzer data and visually inspect all the WISE images to confirm bona fide point sources. We find nine planet-bearing stars show dust excess emission at 12 and/or 22 mu m at > or =3sigma level around young, main-sequence, or evolved giant stars. Overall, our results yield an excess incidence of approximately 2.6% for stars of all evolutionary stages, but approximately 1% for planetary debris disks around main-sequence stars. Besides recovering previously known warm systems, we identify one new excess candidate around the young star UScoCTIO 108. Copyright (Copyright) 2012. The American Astronomical Society. All rights reserved. JF - The Astrophysical Journal AU - Morales, Farisa Y AU - Padgett, D L AU - Bryden, G AU - Werner, M W AU - Furlan, E Y1 - 2012/09/20/ PY - 2012 DA - 2012 Sep 20 EP - Paper No. 7 PB - IOP Publishing for American Astronomical Society, Bristol VL - 757 IS - 1 SN - 0004-637X, 0004-637X KW - giant stars KW - extrasolar planets KW - asteroids KW - Spitzer Space Telescope KW - habitable zone KW - infrared spectra KW - terrestrial planets KW - photosphere KW - planets KW - evaporation KW - cosmic dust KW - detection KW - comets KW - stars KW - spectra KW - planetary systems KW - circumstellar matter KW - Wide-field Infrared Survey Explorer KW - main-sequence stars KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1660632105?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal&rft.atitle=WISE+detections+of+dust+in+the+habitable+zones+of+planet-bearing+stars&rft.au=Morales%2C+Farisa+Y%3BPadgett%2C+D+L%3BBryden%2C+G%3BWerner%2C+M+W%3BFurlan%2C+E&rft.aulast=Morales&rft.aufirst=Farisa&rft.date=2012-09-20&rft.volume=757&rft.issue=1&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F757%2F1%2F7 L2 - http://iopscience.iop.org/0004-637X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2015-01-01 N1 - Number of references - 43 N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2015-04-16 N1 - SubjectsTermNotLitGenreText - asteroids; circumstellar matter; comets; cosmic dust; detection; evaporation; extrasolar planets; giant stars; habitable zone; infrared spectra; main-sequence stars; photosphere; planetary systems; planets; spectra; Spitzer Space Telescope; stars; terrestrial planets; Wide-field Infrared Survey Explorer DO - http://dx.doi.org/10.1088/0004-637X/757/1/7 ER - TY - JOUR T1 - Chemical composition of tropospheric air masses encountered during high altitude flights (>11.5 km) during the 2009 fall Operation Ice Bridge field campaign AN - 1171887130; 17213196 AB - As part of the 2009 Operation Ice Bridge campaign, the NASA DC-8 aircraft was used to fill the data-time gap in laser observation of the changes in ice sheets, glaciers and sea ice between ICESat-I (Ice, Cloud, and land Elevation Satellite) and ICESat-II. Complementing the cryospheric instrument payload were four in situ atmospheric sampling instruments integrated onboard to measure trace gas concentrations of CO sub(2), CO, N sub(2)O, CH sub(4), water vapor and various VOCs (Volatile Organic Compounds). This paper examines two plumes encountered at high altitude (12 km) during the campaign; one during a southbound transit flight (13 degree S) and the other at 86 degree S over Antarctica. The data presented are especially significant as the Southern Hemisphere is heavily under-sampled during the austral spring, with few if any high-resolution airborne observations of atmospheric gases made over Antarctica. Strong enhancements of CO, CH sub(4), N sub(2)O, CHCl sub(3), OCS, C sub(2)H sub(6), C sub(2)H sub(2) and C sub(3)H sub(8) were observed in the two intercepted air masses that exhibited variations in VOC composition suggesting different sources. The transport model FLEXPART showed that the 13 degree S plume contained predominately biomass burning emissions originating from Southeast Asia and South Africa, while both anthropogenic and biomass burning emissions were observed at 86 degree S with South America and South Africa as indicated source regions. The data presented here show evidence that boundary layer pollution is transported from lower latitudes toward the upper troposphere above the South Pole, which may not have been observed in the past. JF - Journal of Geophysical Research. Atmospheres AU - Melissa Yang, Mei Ying AU - Vay, Stephanie A AU - Stohl, Andreas AU - Choi, Yonghoon AU - Diskin, Glenn S AU - Sachse, Glen W AU - Blake, Donald R AD - Chemistry and Dynamics Branch, NASA Langley Research Center, Hampton, Virginia, USA Y1 - 2012/09/14/ PY - 2012 DA - 2012 Sep 14 PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 117 IS - D17 SN - 2169-897X, 2169-897X KW - Meteorological & Geoastrophysical Abstracts; Pollution Abstracts KW - Air masses KW - Ice KW - Methane KW - Atmospheric pollution models KW - Combustion products KW - Antarctica, South Pole KW - Volatile organic compounds in atmosphere KW - Aircraft observations KW - Troposphere KW - Biomass KW - Methane in the atmosphere KW - PS, Antarctica KW - ASW, South America KW - Altitude KW - Sea ice KW - Ice bridges KW - Lasers KW - South Africa KW - Burning KW - ISEW, Southeast Asia KW - Volatile organic compounds KW - Oceanographic data KW - P 0000:AIR POLLUTION KW - M2 551.326:Floating Ice (551.326) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1171887130?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+Geophysical+Union+Fall+Meeting&rft.atitle=Geochemical+analysis+of+layered+outcrops+using+laser-induced+breakdown+spectroscopy+%28LIBS%29%3B+implications+for+Mars+exploration&rft.au=Sobron%2C+P%3BLefebvre%2C+C%3BLeveille%2C+R+J%3BKoujelev%2C+A%3BHaltigin%2C+T%3BHongwei%2C+D%3BWang%2C+A%3BCabrol%2C+N+A%3BZacny%2C+K%3BCraft%2C+J%3BAnonymous&rft.aulast=Sobron&rft.aufirst=P&rft.date=2012-12-01&rft.volume=2012&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=American+Geophysical+Union+Fall+Meeting&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-11-01 N1 - Number of references - 24 N1 - Last updated - 2014-04-17 N1 - SubjectsTermNotLitGenreText - Air masses; Methane in the atmosphere; Sea ice; Atmospheric pollution models; Ice bridges; Aircraft observations; Volatile organic compounds in atmosphere; Lasers; Oceanographic data; Methane; Ice; Altitude; Combustion products; Troposphere; Burning; Biomass; Volatile organic compounds; PS, Antarctica; ASW, South America; Antarctica, South Pole; South Africa; ISEW, Southeast Asia DO - http://dx.doi.org/10.1029/2012JD017858 ER - TY - NEWS T1 - Meteor Smoke Makes Strange Clouds AN - 1039268234 JF - UPI Space Daily AU - Dr. Tony Phillips for NASA Science News Y1 - 2012/09/13/ PY - 2012 DA - 2012 Sep 13 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1039268234?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Meteor+Smoke+Makes+Strange+Clouds&rft.au=Dr.+Tony+Phillips+for+NASA+Science+News&rft.aulast=Dr.+Tony+Phillips+for+NASA+Science+News&rft.aufirst=&rft.date=2012-09-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-09-13 ER - TY - JOUR T1 - Toward a combined SAGE II-HALOE aerosol climatology: an evaluation of HALOE version 19 stratospheric aerosol extinction coefficient observations AN - 1093471492; 17188427 AB - Herein, the Halogen Occultation Experiment (HALOE) aerosol extinction coefficient data is evaluated in the low aerosol loading period after 1996 as the first necessary step in a process that will eventually allow the production of a combined HALOE/SAGE II (Stratospheric Aerosol and Gas Experiment) aerosol climatology of derived aerosol products including surface area density. Based on these analyses, it is demonstrated that HALOE's 3.46 mu m is of good quality above 19 km and suitable for scientific applications above that altitude. However, it is increasingly suspect at lower altitudes and should not be used below 17 km under any circumstances after 1996. The 3.40 mu m is biased by about 10% throughout the lower stratosphere due to the failure to clear NO sub(2) but otherwise appears to be a high quality product down to 15 km. The 2.45 and 5.26 mu m aerosol extinction coefficient measurements are clearly biased and should not be used for scientific applications after the most intense parts of the Pinatubo period. Many of the issues in the aerosol data appear to be related to either the failure to clear some interfering gas species or doing so poorly. For instance, it is clear that the 3.40 mu m aerosol extinction coefficient measurements can be improved through the inclusion of an NO sub(2) correction and could, in fact, end up as the highest quality overall HALOE aerosol extinction coefficient measurement. It also appears that the 2.45 and 5.26 mu m channels may be improved by updating the Upper Atmosphere Pilot Database which is used as a resource for the removal of gas species otherwise not available from direct HALOE measurements. Finally, a simple model to demonstrate the promise of mixed visible/infrared aerosol extinction coefficient ensembles for the retrieval of bulk aerosol properties demonstrates that a combined HALOE/SAGE II aerosol climatology is feasible and may represent a substantial improvement over independently derived data sets. JF - Atmospheric Chemistry and Physics AU - Thomason, L W AD - NASA Langley Research Center, Mail Stop 475, Hampton, VA 23681, USA Y1 - 2012/09/12/ PY - 2012 DA - 2012 Sep 12 SP - 8177 EP - 8188 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 17 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Evaluation KW - Altitude KW - Extinction coefficient KW - Climatology KW - Upper atmosphere KW - Aerosols KW - Aerosol extinction KW - Halogens KW - Density KW - Stratosphere KW - Model Studies KW - Channels KW - Databases KW - Stratospheric aerosols KW - Atmospheric chemistry KW - Aerosol properties KW - Volcanic eruption, Mt. Pinatubo KW - M2 551.510.42:Air Pollution (551.510.42) KW - Q2 09188:Atmospheric chemistry KW - AQ 00006:Sewage KW - SW 5080:Evaluation, processing and publication UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1093471492?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=Toward+a+combined+SAGE+II-HALOE+aerosol+climatology%3A+an+evaluation+of+HALOE+version+19+stratospheric+aerosol+extinction+coefficient+observations&rft.au=Thomason%2C+L+W&rft.aulast=Thomason&rft.aufirst=L&rft.date=2012-09-12&rft.volume=12&rft.issue=17&rft.spage=8177&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Aerosols; Extinction coefficient; Halogens; Atmospheric chemistry; Climatology; Stratosphere; Upper atmosphere; Stratospheric aerosols; Aerosol extinction; Aerosol properties; Volcanic eruption, Mt. Pinatubo; Evaluation; Channels; Databases; Altitude; Density; Model Studies ER - TY - JOUR T1 - Global and regional trends of aerosol optical depth over land and ocean using SeaWiFS measurements from 1997 to 2010 AN - 1093468680; 17188420 AB - Both sensor calibration and satellite retrieval algorithm play an important role in the ability to determine accurately long-term trends from satellite data. Owing to the unprecedented accuracy and long-term stability of its radiometric calibration, SeaWiFS measurements exhibit minimal uncertainty with respect to sensor calibration. In this study, we take advantage of this well-calibrated set of measurements by applying a newly-developed aerosol optical depth (AOD) retrieval algorithm over land and ocean to investigate the distribution of AOD, and to identify emerging patterns and trends in global and regional aerosol loading during its 13-yr mission. Our correlation analysis between climatic indices (such as ENSO) and AOD suggests strong relationships for Saharan dust export as well as biomass-burning activity in the tropics, associated with large-scale feedbacks. The results also indicate that the averaged AOD trend over global ocean is weakly positive from 1998 to 2010 and comparable to that observed by MODIS but opposite in sign to that observed by AVHRR during overlapping years. On regional scales, distinct tendencies are found for different regions associated with natural and anthropogenic aerosol emission and transport. For example, large upward trends are found over the Arabian Peninsula that indicate a strengthening of the seasonal cycle of dust emission and transport processes over the whole region as well as over downwind oceanic regions. In contrast, a negative-neutral tendency is observed over the desert/arid Saharan region as well as in the associated dust outflow over the north Atlantic. Additionally, we found decreasing trends over the eastern US and Europe, and increasing trends over countries such as China and India that are experiencing rapid economic development. In general, these results are consistent with those derived from ground-based AERONET measurements. JF - Atmospheric Chemistry and Physics AU - Hsu, N C AU - Gautam, R AU - Sayer, A M AU - Bettenhausen, C AU - Li, C AU - Jeong, MJ AU - Tsay, S-C AU - Holben, B N AD - NASA Goddard Space Flight Center, Greenbelt, MD, USA Y1 - 2012/09/10/ PY - 2012 DA - 2012 Sep 10 SP - 8037 EP - 8053 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 17 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Remote Sensing KW - ISW, Arabian Peninsula KW - Sensors KW - Algorithms KW - Correlation analysis KW - Dust emission KW - Distribution Patterns KW - ISW, India KW - Calibrations KW - ANE, Europe KW - MODIS (Moderate Resolution Imaging Spectrometer) KW - Seasonal variations KW - Satellite Technology KW - Atmospheric particulates KW - Aerosols KW - Mathematical models KW - Saharan dust KW - Climate KW - AN, North Atlantic KW - Dusts KW - Southern Oscillation KW - Satellite data KW - Oceans KW - El Nino-Southern Oscillation event KW - Atmospheric chemistry KW - Africa, Sahara Desert KW - Optical depth of aerosols KW - China, People's Rep. KW - Eolian dust KW - SW 5010:Network design KW - AQ 00006:Sewage KW - Q2 09222:Methods and instruments KW - M2 551.588:Environmental Influences (551.588) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1093468680?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=Global+and+regional+trends+of+aerosol+optical+depth+over+land+and+ocean+using+SeaWiFS+measurements+from+1997+to+2010&rft.au=Hsu%2C+N+C%3BGautam%2C+R%3BSayer%2C+A+M%3BBettenhausen%2C+C%3BLi%2C+C%3BJeong%2C+MJ%3BTsay%2C+S-C%3BHolben%2C+B+N&rft.aulast=Hsu&rft.aufirst=N&rft.date=2012-09-10&rft.volume=12&rft.issue=17&rft.spage=8037&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Atmospheric particulates; Aerosols; Mathematical models; Sensors; Atmospheric chemistry; Climate; Seasonal variations; Eolian dust; Southern Oscillation; Satellite data; Saharan dust; El Nino-Southern Oscillation event; Algorithms; MODIS (Moderate Resolution Imaging Spectrometer); Optical depth of aerosols; Correlation analysis; Dust emission; Distribution Patterns; Remote Sensing; Satellite Technology; Calibrations; Oceans; Dusts; ISW, India; ISW, Arabian Peninsula; ANE, Europe; Africa, Sahara Desert; China, People's Rep.; AN, North Atlantic ER - TY - JOUR T1 - Evaluation of the absolute regional temperature potential AN - 1093470888; 17188414 AB - The Absolute Regional Temperature Potential (ARTP) is one of the few climate metrics that provides estimates of impacts at a sub-global scale. The ARTP presented here gives the time-dependent temperature response in four latitude bands (90-28 degree S, 28 degree S-28 degree N, 28-60 degree N and 60-90 degree N) as a function of emissions based on the forcing in those bands caused by the emissions. It is based on a large set of simulations performed with a single atmosphere-ocean climate model to derive regional forcing/response relationships. Here I evaluate the robustness of those relationships using the forcing/response portion of the ARTP to estimate regional temperature responses to the historic aerosol forcing in three independent climate models. These ARTP results are in good accord with the actual responses in those models. Nearly all ARTP estimates fall within plus or minus 20% of the actual responses, though there are some exceptions for 90-28 degree S and the Arctic, and in the latter the ARTP may vary with forcing agent. However, for the tropics and the Northern Hemisphere mid-latitudes in particular, the plus or minus 20% range appears to be roughly consistent with the 95% confidence interval. Land areas within these two bands respond 39-45% and 9-39% more than the latitude band as a whole. The ARTP, presented here in a slightly revised form, thus appears to provide a relatively robust estimate for the responses of large-scale latitude bands and land areas within those bands to inhomogeneous radiative forcing and thus potentially to emissions as well. Hence this metric could allow rapid evaluation of the effects of emissions policies at a finer scale than global metrics without requiring use of a full climate model. JF - Atmospheric Chemistry and Physics AU - Shindell, D T AD - NASA Goddard Institute for Space Studies and Columbia Earth Institute, New York, NY, USA Y1 - 2012/09/06/ PY - 2012 DA - 2012 Sep 06 SP - 7955 EP - 7960 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 17 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Evaluation KW - Radiative forcing KW - Arctic KW - Atmospheric Chemistry KW - Temperature effects KW - Aerosols KW - Climate models KW - Climates KW - Climate KW - Temperature KW - Model Studies KW - PN, Arctic KW - Numerical simulations KW - Atmospheric chemistry KW - Atmospheric forcing KW - Q2 09188:Atmospheric chemistry KW - SW 5080:Evaluation, processing and publication KW - M2 551.465:Structure/Dynamics/Circulation (551.465) KW - AQ 00005:Underground Services and Water Use UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1093470888?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=Evaluation+of+the+absolute+regional+temperature+potential&rft.au=Shindell%2C+D+T&rft.aulast=Shindell&rft.aufirst=D&rft.date=2012-09-06&rft.volume=12&rft.issue=17&rft.spage=7955&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Temperature effects; Aerosols; Atmospheric forcing; Atmospheric chemistry; Climate; Radiative forcing; Climate models; Numerical simulations; Atmospheric Chemistry; Evaluation; Climates; Temperature; Arctic; Model Studies; PN, Arctic ER - TY - JOUR T1 - Allophane detection on Mars with thermal emission spectrometer data and implications for regional-scale chemical weathering processes AN - 1080610826; 2012-086321 AB - Models of Thermal Emission Spectrometer (TES) data suggest that poorly-crystalline weathering products allophane and aluminosilicate gel occur in several low-albedo regions of Mars. The presence of allophane in TES models indicates that the martian surface experienced low-temperature chemical weathering at low water-to-rock ratios and mildly acidic to neutral pH on regional scales. The allophane and gel may be ancient and preserved by a persistently dry martian climate. Alternatively, evidence for recent ground ice in these regions suggests that pedogenic processes causing the formation of poorly-crystalline aluminosilicates could be late Amazonian in age and may be active today. While previous models have suggested that global-scale acidic weathering has occurred on Mars for the past 3.5 billion years, the presence of allophane indicates that acidic weathering was not occurring in these low-albedo regions and that mildly acidic to neutral weathering has been an important regional-scale weathering process on the martian surface. JF - Geology (Boulder) AU - Rampe, E B AU - Kraft, M D AU - Sharp, T G AU - Golden, D C AU - Ming, D W AU - Christensen, P R Y1 - 2012/09/04/ PY - 2012 DA - 2012 Sep 04 SP - 995 EP - 998 PB - Geological Society of America (GSA), Boulder, CO VL - 40 IS - 11 SN - 0091-7613, 0091-7613 KW - silicates KW - surface properties KW - chemical weathering KW - colloidal materials KW - clay mineralogy KW - Mars KW - weathering KW - gels KW - emission spectra KW - clay minerals KW - terrestrial planets KW - regional patterns KW - planets KW - allophane KW - detection KW - aluminosilicates KW - thermal emission KW - sheet silicates KW - spectra KW - remote sensing KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080610826?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geology+%28Boulder%29&rft.atitle=Allophane+detection+on+Mars+with+thermal+emission+spectrometer+data+and+implications+for+regional-scale+chemical+weathering+processes&rft.au=Rampe%2C+E+B%3BKraft%2C+M+D%3BSharp%2C+T+G%3BGolden%2C+D+C%3BMing%2C+D+W%3BChristensen%2C+P+R&rft.aulast=Rampe&rft.aufirst=E&rft.date=2012-09-04&rft.volume=40&rft.issue=11&rft.spage=995&rft.isbn=&rft.btitle=&rft.title=Geology+%28Boulder%29&rft.issn=00917613&rft_id=info:doi/10.1130%2FG33215.1 L2 - http://www.gsajournals.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States | Reference includes data supplied by the Geological Society of America, Boulder, CO, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 29 N1 - PubXState - CO N1 - Document feature - illus. incl. 1 table, sketch map N1 - SuppNotes - With GSA Data Repository Item 2012280; accessed on September 13, 2012 N1 - Last updated - 2014-01-09 N1 - CODEN - GLGYBA N1 - SubjectsTermNotLitGenreText - allophane; aluminosilicates; chemical weathering; clay mineralogy; clay minerals; colloidal materials; detection; emission spectra; gels; Mars; planets; regional patterns; remote sensing; sheet silicates; silicates; spectra; surface properties; terrestrial planets; thermal emission; weathering DO - http://dx.doi.org/10.1130/G33215.1 ER - TY - NEWS T1 - Q and A with Atmospheric Scientist Hongbin Yu AN - 1037806462 JF - UPI Space Daily AU - Kathryn Hansen for NASA Earth Science News Y1 - 2012/09/04/ PY - 2012 DA - 2012 Sep 04 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037806462?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Q+and+A+with+Atmospheric+Scientist+Hongbin+Yu&rft.au=Kathryn+Hansen+for+NASA+Earth+Science+News&rft.aulast=Kathryn+Hansen+for+NASA+Earth+Science+News&rft.aufirst=&rft.date=2012-09-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-09-04 ER - TY - JOUR T1 - The O/OREOS Mission: First Science Data from the Space Environment Viability of Organics (SEVO) Payload AN - 1827882603; PQ0003681184 AB - We report the first science results from the Space Environment Viability of Organics (SEVO) payload aboard the Organism/Organic Exposure to Orbital Stresses (O/OREOS) free-flying nanosatellite, which completed its nominal spaceflight mission in May 2011 but continues to acquire data biweekly. The SEVO payload integrates a compact UV-visible-NIR spectrometer, utilizing the Sun as its light source, with a 24-cell sample carousel that houses four classes of vacuum-deposited organic thin films: polycyclic aromatic hydrocarbon (PAH), amino acid, metalloporphyrin, and quinone. The organic films are enclosed in hermetically sealed sample cells that contain one of four astrobiologically relevant microenvironments. Results are reported in this paper for the first 309 days of the mission, during which the samples were exposed for 2210h to direct solar illumination (1080kJ/cm2 of solar energy over the 124-2600nm range). Transmission spectra (200-1000nm) were recorded for each film, at first daily and subsequently every 15 days, along with a solar spectrum and the dark response of the detector array. Results presented here include eight preflight and 16 in-flight spectra of eight SEVO sample cells. Spectra from the PAH thin film in a water-vapor-containing microenvironment indicate measurable change due to solar irradiation in orbit, while three other nominally water-free microenvironments show no appreciable change. The quinone anthrarufin showed high photostability and no significant spectroscopically measurable change in any of the four microenvironments during the same period. The SEVO experiment provides the first in situ real-time analysis of the photostability of organic compounds and biomarkers in orbit. Key Words: Cubesat-Nanosatellite-O/OREOS-SEVO-Low- Earth orbit-Astrobiology-UV-visible spectroscopy-Photochemistry-Photodegradation of organics-Polycyclic aromatic hydrocarbons-Quinone. Astrobiology 12, 841-853. JF - Astrobiology AU - Mattioda, Andrew AU - Cook, Amanda AU - Ehrenfreund, Pascale AU - Quinn, Richard AU - Ricco, Antonio J AU - Squires, David AU - Bramall, Nathan AU - Bryson, Kathryn AU - Chittenden, Julie AU - Minelli, Giovanni AU - Agasid, Elwood AU - Allamandola, Lou AU - Beasley, Chris AU - Burton, Roland AU - Defouw, Greg AU - Diaz-Aguado, Millan AU - Fonda, Mark AU - Friedericks, Charles AU - Kitts, Chris AU - Landis, David AU - McIntyre, Mike AU - Neumann, Michael AU - Rasay, Mike AU - Ricks, Robert AU - Salama, Farid AU - Santos, Orlando AU - Schooley, Aaron AU - Yost, Bruce AU - Young, Anthony AD - NASA Ames Research Center, Moffett Field, California. Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 841 EP - 853 PB - Mary Ann Liebert, Inc., 2 Madison Ave Larchmont NY 10538-1962 United States VL - 12 IS - 9 SN - 1531-1074, 1531-1074 KW - Pollution Abstracts; ASFA 1: Biological Sciences & Living Resources; Ecology Abstracts KW - Housing KW - Pollution effects KW - Biomarkers KW - Radiation KW - Sun KW - Aromatic hydrocarbons KW - Solar energy KW - Pollution indicators KW - Films KW - Bioindicators KW - Houses KW - Polycyclic aromatic hydrocarbons KW - Amino acids KW - Data processing KW - Space flight KW - Stress KW - biomarkers KW - Light effects KW - Light sources KW - Illumination KW - Irradiation KW - Energy KW - Quinone KW - Solar power KW - Residential areas KW - Microenvironments KW - Organic compounds KW - Aromatics KW - P 9999:GENERAL POLLUTION KW - D 04040:Ecosystem and Ecology Studies KW - Q1 08481:Productivity UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1827882603?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aecology&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrobiology&rft.atitle=The+O%2FOREOS+Mission%3A+First+Science+Data+from+the+Space+Environment+Viability+of+Organics+%28SEVO%29+Payload&rft.au=Mattioda%2C+Andrew%3BCook%2C+Amanda%3BEhrenfreund%2C+Pascale%3BQuinn%2C+Richard%3BRicco%2C+Antonio+J%3BSquires%2C+David%3BBramall%2C+Nathan%3BBryson%2C+Kathryn%3BChittenden%2C+Julie%3BMinelli%2C+Giovanni%3BAgasid%2C+Elwood%3BAllamandola%2C+Lou%3BBeasley%2C+Chris%3BBurton%2C+Roland%3BDefouw%2C+Greg%3BDiaz-Aguado%2C+Millan%3BFonda%2C+Mark%3BFriedericks%2C+Charles%3BKitts%2C+Chris%3BLandis%2C+David%3BMcIntyre%2C+Mike%3BNeumann%2C+Michael%3BRasay%2C+Mike%3BRicks%2C+Robert%3BSalama%2C+Farid%3BSantos%2C+Orlando%3BSchooley%2C+Aaron%3BYost%2C+Bruce%3BYoung%2C+Anthony&rft.aulast=Mattioda&rft.aufirst=Andrew&rft.date=2012-09-01&rft.volume=12&rft.issue=9&rft.spage=841&rft.isbn=&rft.btitle=&rft.title=Astrobiology&rft.issn=15311074&rft_id=info:doi/10.1089%2Fast.2012.0861 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2016-10-01 N1 - Number of references - 39 N1 - Last updated - 2016-12-22 N1 - SubjectsTermNotLitGenreText - Light sources; Solar power; Pollution effects; Aromatic hydrocarbons; Organic compounds; Biomarkers; Pollution indicators; Aromatics; Polycyclic aromatic hydrocarbons; Houses; Data processing; Amino acids; Space flight; biomarkers; Light effects; Radiation; Illumination; Energy; Quinone; Sun; Microenvironments; Films; Bioindicators; Housing; Irradiation; Residential areas; Stress; Solar energy DO - http://dx.doi.org/10.1089/ast.2012.0861 ER - TY - JOUR T1 - Impact of water withdrawals from groundwater and surface water on continental water storage variations AN - 1641012216; 2015-001858 AB - Humans have strongly impacted the global water cycle, not only water flows but also water storage. We have performed a first global-scale analysis of the impact of water withdrawals on water storage variations, using the global water resources and use model WaterGAP. This required estimation of fractions of total water withdrawals from groundwater, considering five water use sectors. According to our assessment, the source of 35% of the water withdrawn worldwide (4300 km (super 3) /year during 1998-2002) is groundwater. Groundwater contributes 42%, 36% and 27% of water used for irrigation, households and manufacturing, respectively, while we assume that only surface water is used for livestock and for cooling of thermal power plants. Consumptive water use was 1400 km (super 3) /year during 1998-2002. It is the sum of the net abstraction of 250 km (super 3) /year of groundwater (taking into account evapotranspiration and return flows of withdrawn surface water and groundwater) and the net abstraction of 1150 km (super 3) /year of surface water. Computed net abstractions indicate, for the first time at the global scale, where and when human water withdrawals decrease or increase groundwater or surface water storage. In regions with extensive surface water irrigation, such as Southern China, net abstractions from groundwater are negative, i.e. groundwater is recharged by irrigation. The opposite is true for areas dominated by groundwater irrigation, such as in the High Plains aquifer of the central USA, where net abstraction of surface water is negative because return flow of withdrawn groundwater recharges the surface water compartments. In intensively irrigated areas, the amplitude of seasonal total water storage variations is generally increased due to human water use; however, in some areas, it is decreased. For the High Plains aquifer and the whole Mississippi basin, modeled groundwater and total water storage variations were compared with estimates of groundwater storage variations based on groundwater table observations, and with estimates of total water storage variations from the GRACE satellites mission. Due to the difficulty in estimating area-averaged seasonal groundwater storage variations from point observations of groundwater levels, it is uncertain whether WaterGAP underestimates actual variations or not. We conclude that WaterGAP possibly overestimates water withdrawals in the High Plains aquifer where impact of human water use on water storage is readily discernible based on WaterGAP calculations and groundwater observations. No final conclusion can be drawn regarding the possibility of monitoring water withdrawals in the High Plains aquifer using GRACE. For the less intensively irrigated Mississippi basin, observed and modeled seasonal groundwater storage reveals a discernible impact of water withdrawals in the basin, but this is not the case for total water storage such that water withdrawals at the scale of the whole Mississippi basin cannot be monitored by GRACE. Abstract Copyright (2012) Elsevier, B.V. JF - Journal of Geodynamics AU - Doell, Petra AU - Hoffmann-Dobrev, H AU - Portmann, F T AU - Siebert, S AU - Eicker, A AU - Rodell, M AU - Strassberg, G AU - Scanlon, B R Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 143 EP - 156 PB - Elsevier, Oxford VL - 59-60 SN - 0264-3707, 0264-3707 KW - water use KW - United States KW - water storage KW - North America KW - annual variations KW - Mississippi River basin KW - human activity KW - global KW - surface water KW - GRACE KW - storage coefficient KW - satellite methods KW - irrigation KW - ground water KW - aquifers KW - mass KW - gravity field KW - High Plains Aquifer KW - seasonal variations KW - discharge KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1641012216?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geodynamics&rft.atitle=Impact+of+water+withdrawals+from+groundwater+and+surface+water+on+continental+water+storage+variations&rft.au=Doell%2C+Petra%3BHoffmann-Dobrev%2C+H%3BPortmann%2C+F+T%3BSiebert%2C+S%3BEicker%2C+A%3BRodell%2C+M%3BStrassberg%2C+G%3BScanlon%2C+B+R&rft.aulast=Doell&rft.aufirst=Petra&rft.date=2012-09-01&rft.volume=59-60&rft.issue=&rft.spage=143&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geodynamics&rft.issn=02643707&rft_id=info:doi/10.1016%2Fj.jog.2011.05.001 L2 - http://www.sciencedirect.com/science/journal/02643707 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2015, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2015-01-01 N1 - Number of references - 46 N1 - Document feature - illus. incl. 1 table, geol. sketch maps N1 - Last updated - 2014-12-31 N1 - SubjectsTermNotLitGenreText - annual variations; aquifers; discharge; global; GRACE; gravity field; ground water; High Plains Aquifer; human activity; irrigation; mass; Mississippi River basin; North America; satellite methods; seasonal variations; storage coefficient; surface water; United States; water storage; water use DO - http://dx.doi.org/10.1016/j.jog.2011.05.001 ER - TY - JOUR T1 - Formation of amino acids and nucleotide bases in a Titan atmosphere simulation experiment AN - 1623273307; 2014-088591 AB - The discovery of large (>100 u) molecules in Titan's upper atmosphere has heightened astrobiological interest in this unique satellite. In particular, complex organic aerosols produced in atmospheres containing C, N, O, and H, like that of Titan, could be a source of prebiotic molecules. In this work, aerosols produced in a Titan atmosphere simulation experiment with enhanced CO (N (sub 2) /CH (sub 4) /CO gas mixtures of 96.2%/2.0%/1.8% and 93.2%/5.0%/1.8%) were found to contain 18 molecules with molecular formulae that correspond to biological amino acids and nucleotide bases. Very high-resolution mass spectrometry of isotopically labeled samples confirmed that C (sub 4) H (sub 5) N (sub 3) O, C (sub 4) H (sub 4) N (sub 2) O (sub 2) , C (sub 5) H (sub 6) N (sub 2) O (sub 2) , C (sub 5) H (sub 5) N (sub 5) , and C (sub 6) H (sub 9) N (sub 3) O (sub 2) are produced by chemistry in the simulation chamber. Gas chromatography-mass spectrometry (GC-MS) analyses of the non-isotopic samples confirmed the presence of cytosine (C (sub 4) H (sub 5) N (sub 3) O), uracil (C (sub 5) H (sub 4) N (sub 2) O (sub 2) ), thymine (C (sub 5) H (sub 6) N (sub 2) O (sub 2) ), guanine (C (sub 5) H (sub 5) N (sub 5) O), glycine (C (sub 2) H (sub 5) NO (sub 2) ), and alanine (C (sub 3) H (sub 7) NO (sub 2) ). Adenine (C (sub 5) H (sub 5) N (sub 5) ) was detected by GC-MS in isotopically labeled samples. The remaining prebiotic molecules were detected in unlabeled samples only and may have been affected by contamination in the chamber. These results demonstrate that prebiotic molecules can be formed by the high-energy chemistry similar to that which occurs in planetary upper atmospheres and therefore identifies a new source of prebiotic material, potentially increasing the range of planets where life could begin. JF - Astrobiology AU - Hoerst, S M AU - Yelle, R V AU - Buch, A AU - Carrasco, N AU - Cernogora, G AU - Quirico, O E AU - Sciamma-O'Brien, E AU - Smith, M A AU - Somogyi, A AU - Thissen, C R AU - Vuitton, V Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 809 EP - 817 PB - Mary Ann Liebert, Larchmont, NY VL - 12 IS - 9 SN - 1531-1074, 1531-1074 KW - tholins KW - icy satellites KW - guanine KW - alanine KW - gas chromatograms KW - aliphatic hydrocarbons KW - mass spectra KW - astrobiology KW - simulation KW - nitrogen KW - adenine KW - uracil KW - chemical reactions KW - electromagnetic radiation KW - amino acids KW - Titan Satellite KW - spectra KW - synthesis KW - satellites KW - nucleotides KW - experimental studies KW - methane KW - thymine KW - photochemistry KW - glycine KW - atmosphere KW - alkanes KW - ultraviolet radiation KW - carbon monoxide KW - organic compounds KW - organic acids KW - chromatograms KW - hydrocarbons KW - prebiotic molecules KW - cytosine KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1623273307?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrobiology&rft.atitle=Formation+of+amino+acids+and+nucleotide+bases+in+a+Titan+atmosphere+simulation+experiment&rft.au=Hoerst%2C+S+M%3BYelle%2C+R+V%3BBuch%2C+A%3BCarrasco%2C+N%3BCernogora%2C+G%3BQuirico%2C+O+E%3BSciamma-O%27Brien%2C+E%3BSmith%2C+M+A%3BSomogyi%2C+A%3BThissen%2C+C+R%3BVuitton%2C+V&rft.aulast=Hoerst&rft.aufirst=S&rft.date=2012-09-01&rft.volume=12&rft.issue=9&rft.spage=809&rft.isbn=&rft.btitle=&rft.title=Astrobiology&rft.issn=15311074&rft_id=info:doi/10.1089%2Fast.2011.0623 L2 - http://www.liebertpub.com/publication.aspx?pub_id=99 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 35 N1 - PubXState - NY N1 - Document feature - illus. incl. 1 table N1 - Last updated - 2014-11-13 N1 - SubjectsTermNotLitGenreText - adenine; alanine; aliphatic hydrocarbons; alkanes; amino acids; astrobiology; atmosphere; carbon monoxide; chemical reactions; chromatograms; cytosine; electromagnetic radiation; experimental studies; gas chromatograms; glycine; guanine; hydrocarbons; icy satellites; mass spectra; methane; nitrogen; nucleotides; organic acids; organic compounds; photochemistry; prebiotic molecules; satellites; simulation; spectra; synthesis; tholins; thymine; Titan Satellite; ultraviolet radiation; uracil DO - http://dx.doi.org/10.1089/ast.2011.0623 ER - TY - JOUR T1 - Charging of dust grains in astrophysical environments by secondary electron emissions AN - 1618134464; 2014-083396 AB - The dominant charging processes in various astrophysical environments are considered to be by photoelectric emissions with radiation from nearby stars and secondary electron emissions (SEE) by impact of electrons in a medium with sufficiently high energies. The charging of bulk materials with planar surfaces by SEE with electron impact appears to be well understood with theoretical expressions as well as by experimental techniques. However, the charging of submicron/micron-size dust grains by SEE with sufficiently high-energy electrons is a complex process, and is a function of electron energies, the electron current, and the grain size, and the charge or the surface potential. Development of viable theoretical models and acquisition of experimental data for charging properties of micron-size dust grains are still in the early stages. This paper focuses on SEE charging properties of individual micron-size dust grains by low-energy electron impact, obtained from laboratory measurements on an experimental facility based on an electrodynamic balance. The measurements of SEE yields of positively charged dust grains indicate the yields increase with decreasing grain size and the equilibrium surface potentials showing generally linear size dependence. These experimental results are generally in agreement with several independent experimental and analytical model studies in the literature, with the exception of a recently published paper which is in fundamental conflict with our studies as well as with several other experimental and theoretical studies. The sources and causes of this conflict are critically examined and discussed in this paper. Copyright (Copyright) 2012. The American Astronomical Society. All rights reserved. JF - The Astrophysical Journal AU - Abbas, M M AU - Tankosic, D AU - LeClair, A C AU - Spann, J F Y1 - 2012/09/01/ PY - 2012 DA - 2012 Sep 01 EP - Paper No. 41 PB - IOP Publishing for American Astronomical Society, Bristol VL - 756 IS - 1 SN - 0004-637X, 0004-637X KW - experimental studies KW - Moon KW - clastic sediments KW - grain size KW - Apollo Program KW - electrostatic properties KW - ultraviolet radiation KW - secondary electron emissions KW - X-rays KW - lunar samples KW - electromagnetic radiation KW - stars KW - dust KW - sediments KW - Apollo 11 KW - Apollo 17 KW - photoelectrons KW - electrons KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1618134464?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+Astrophysical+Journal&rft.atitle=Charging+of+dust+grains+in+astrophysical+environments+by+secondary+electron+emissions&rft.au=Abbas%2C+M+M%3BTankosic%2C+D%3BLeClair%2C+A+C%3BSpann%2C+J+F&rft.aulast=Abbas&rft.aufirst=M&rft.date=2012-09-01&rft.volume=756&rft.issue=1&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F756%2F1%2F41 L2 - http://iopscience.iop.org/0004-637X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 44 N1 - Document feature - illus. N1 - Last updated - 2014-10-30 N1 - SubjectsTermNotLitGenreText - Apollo 11; Apollo 17; Apollo Program; clastic sediments; dust; electromagnetic radiation; electrons; electrostatic properties; experimental studies; grain size; lunar samples; Moon; photoelectrons; secondary electron emissions; sediments; stars; ultraviolet radiation; X-rays DO - http://dx.doi.org/10.1088/0004-637X/756/1/41 ER - TY - JOUR T1 - Distributed assimilation of satellite-based snow extent for improving simulated streamflow in mountainous, dense forests: An example over the DMIP2 western basins AN - 1566849336; 20688650 AB - Snow cover area affects snowmelt, soil moisture, evapotranspiration, and ultimately streamflow. For the Distributed Model Intercomparison Project - Phase 2 Western basins, we assimilate satellite-based fractional snow cover area (fSCA) from the Moderate Resolution Imaging Spectroradiometer, or MODIS, into the National Weather Service (NWS) SNOW-17 model. This model is coupled with the NWS Sacramento Heat Transfer (SAC-HT) model inside the National Aeronautics and Space Administration's (NASA) Land Information System. SNOW-17 computes fSCA from snow water equivalent (SWE) values using an areal depletion curve. Using a direct insertion, we assimilate fSCAs in two fully distributed ways: (1) we update the curve by attempting SWE preservation, and (2) we reconstruct SWEs using the curve. The preceding are refinements of an existing simple, conceptually guided NWS algorithm. Satellite fSCA over dense forests inadequately accounts for below-canopy snow, degrading simulated streamflow upon assimilation during snowmelt. Accordingly, we implement a below-canopy allowance during assimilation. This simplistic allowance and direct insertion are found to be inadequate for improving calibrated results, still degrading them as mentioned above. However, for streamflow volume for the uncalibrated runs, we obtain: (1) substantial to major improvements (64-81%) as a percentage of the control run residuals (or distance from observations), and (2) minor improvements (16-22%) as a percentage of observed values. We highlight the need for detailed representations of canopy-snow optical radiative transfer processes in mountainous, dense forest regions if assimilation-based improvements are to be seen in calibrated runs over these areas. Key Points * Unaccounted below-canopy snow extent important * Below-canopy snow accounting improves streamflow simulations * Models should incorporate detailed snow and vegetation representations JF - Water Resources Research AU - Yatheendradas, Soni AU - Lidard, Christa DPeters AU - Koren, Victor AU - Cosgrove, Brian A AU - De Goncalves, Luis GG AU - Smith, Michael AU - Geiger, Jim AU - Cui, Zhengtao AU - Borak, Jordan AU - Kumar, Sujay V AU - Toll, David L AU - Riggs, George AU - Mizukami, Naoki AD - Earth System Science Interdisciplinary Center,College Park, Maryland,USA., soni.yatheendradas-1@nasa.gov Y1 - 2012/09// PY - 2012 DA - Sep 2012 SP - [np] PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 48 IS - 9 SN - 0043-1397, 0043-1397 KW - ASFA 3: Aquatic Pollution & Environmental Quality; Water Resources Abstracts; Aqualine Abstracts KW - dense forests KW - satellite KW - snow extent assimilation KW - streamflow KW - Algorithms KW - Water resources KW - Snow Cover KW - Heat Transfer KW - Mathematical models KW - Snow KW - USA, California, Sacramento KW - Vegetation KW - Streamflow KW - Evapotranspiration KW - Imaging techniques KW - Model Studies KW - Stream flow KW - Heat transfer KW - Snowmelt KW - Radiative transfer KW - Flow Control KW - Information systems KW - SW 5010:Network design KW - Q5 08503:Characteristics, behavior and fate KW - AQ 00006:Sewage UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566849336?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Distributed+assimilation+of+satellite-based+snow+extent+for+improving+simulated+streamflow+in+mountainous%2C+dense+forests%3A+An+example+over+the+DMIP2+western+basins&rft.au=Yatheendradas%2C+Soni%3BLidard%2C+Christa+DPeters%3BKoren%2C+Victor%3BCosgrove%2C+Brian+A%3BDe+Goncalves%2C+Luis+GG%3BSmith%2C+Michael%3BGeiger%2C+Jim%3BCui%2C+Zhengtao%3BBorak%2C+Jordan%3BKumar%2C+Sujay+V%3BToll%2C+David+L%3BRiggs%2C+George%3BMizukami%2C+Naoki&rft.aulast=Yatheendradas&rft.aufirst=Soni&rft.date=2012-09-01&rft.volume=48&rft.issue=9&rft.spage=%5Bnp%5D&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2011WR011347 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2014-12-11 N1 - SubjectsTermNotLitGenreText - Mathematical models; Snow; Water resources; Evapotranspiration; Radiative transfer; Imaging techniques; Heat transfer; Information systems; Stream flow; Algorithms; Snowmelt; Vegetation; Snow Cover; Streamflow; Flow Control; Heat Transfer; Model Studies; USA, California, Sacramento DO - http://dx.doi.org/10.1029/2011WR011347 ER - TY - JOUR T1 - Stratospheric AOD after the 2011 eruption of Nabro Volcano measured by lidars over the Northern Hemisphere AN - 1320155401; 2013-029687 AB - Nabro volcano (13.37 degrees N, 41.70 degrees E) in Eritrea erupted on 13 June 2011 generating a layer of sulfate aerosols that persisted in the stratosphere for months. For the first time we report on ground-based lidar observations of the same event from every continent in the Northern Hemisphere, taking advantage of the synergy between global lidar networks such as EARLINET, MPLNET and NDACC with independent lidar groups and satellite CALIPSO to track the evolution of the stratospheric aerosol layer in various parts of the globe. The globally averaged aerosol optical depth (AOD) due to the stratospheric volcanic aerosol layers was of the order of 0.018 + or - 0.009 at 532 nm, ranging from 0.003 to 0.04. Compared to the total column AOD from the available collocated AERONET stations, the stratospheric contribution varied from 2% to 23% at 532 nm. Copyright 2012 IOP Publishing Ltd JF - Environmental Research Letters AU - Sawamura, P AU - Vernier, J P AU - Barnes, J E AU - Berkoff, T A AU - Welton, E J AU - Alados-Arboledas, L AU - Navas-Guzman, F AU - Pappalardo, G AU - Mona, L AU - Madonna, F AU - Lange, D AU - Sicard, M AU - Godin-Beekmann, S AU - Payen, G AU - Wang, Z AU - Hu, S AU - Tripathi, S N AU - Cordoba-Jabonero, C AU - Hoff, R M Y1 - 2012/09// PY - 2012 DA - September 2012 EP - Citation 034013 PB - Institute of Physics and IOP Publishing, Bristol VL - 7 IS - 3 KW - laser methods KW - East Africa KW - stratosphere KW - transport KW - volcanism KW - Eritrea KW - Nabro KW - climate KW - networks KW - risk management KW - sulfates KW - ground methods KW - global KW - atmosphere KW - satellite methods KW - volcanic risk KW - optical properties KW - lidar methods KW - atmospheric transport KW - eruptions KW - aircraft KW - volcanoes KW - Africa KW - aerosols KW - Northern Hemisphere KW - optical depth KW - remote sensing KW - 24:Quaternary geology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1320155401?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Research+Letters&rft.atitle=Stratospheric+AOD+after+the+2011+eruption+of+Nabro+Volcano+measured+by+lidars+over+the+Northern+Hemisphere&rft.au=Sawamura%2C+P%3BVernier%2C+J+P%3BBarnes%2C+J+E%3BBerkoff%2C+T+A%3BWelton%2C+E+J%3BAlados-Arboledas%2C+L%3BNavas-Guzman%2C+F%3BPappalardo%2C+G%3BMona%2C+L%3BMadonna%2C+F%3BLange%2C+D%3BSicard%2C+M%3BGodin-Beekmann%2C+S%3BPayen%2C+G%3BWang%2C+Z%3BHu%2C+S%3BTripathi%2C+S+N%3BCordoba-Jabonero%2C+C%3BHoff%2C+R+M&rft.aulast=Sawamura&rft.aufirst=P&rft.date=2012-09-01&rft.volume=7&rft.issue=3&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Environmental+Research+Letters&rft.issn=1748-9326&rft_id=info:doi/10.1088%2F1748-9326%2F7%2F3%2F034013 L2 - http://iopscience.iop.org/1748-9326 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2013-01-01 N1 - Number of references - 49 N1 - Document feature - illus. incl. 2 tables, sketch maps N1 - Last updated - 2013-03-28 N1 - SubjectsTermNotLitGenreText - aerosols; Africa; aircraft; atmosphere; atmospheric transport; climate; East Africa; Eritrea; eruptions; global; ground methods; laser methods; lidar methods; Nabro; networks; Northern Hemisphere; optical depth; optical properties; remote sensing; risk management; satellite methods; stratosphere; sulfates; transport; volcanic risk; volcanism; volcanoes DO - http://dx.doi.org/10.1088/1748-9326/7/3/034013 ER - TY - JOUR T1 - Tropical Rainfall Measuring Mission (TRMM) Precipitation Data and Services for Research and Applications AN - 1113240202; 17195316 AB - Precipitation is a critical component of the Earth's hydrological cycle. Launched on 27 November 1997, TRMM is a joint U.S.-Japan satellite mission to provide the first detailed and comprehensive dataset of the four-dimensional distribution of rainfall and latent heating over vastly undersampled tropical and subtropical oceans and continents (40 degree S-40 degree N). Over the past 14 years, TRMM has been a major data source for meteorological, hydrological, and other research and application activities around the world. This short article describes how the NASA Goddard Earth Sciences Data and Information Services Center (GES DISC) provides TRMM archive and nearreal- time precipitation datasets and services for research and applications. TRMM data consist of orbital data from TRMM instruments at the sensor's resolution, gridded data at a range of spatial and temporal resolutions, subsets, ground-based instrument data, and ancillary data. Data analysis, display, and delivery are facilitated by the following services: (1) Mirador (data search and access); (2) TOVAS (TRMM Online Visualization and Analysis System); (3) OPeNDAP (Opensource Project for a Network Data Access Protocol); (4) GrADS Data Server (GDS); and (5) Open Geospatial Consortium (OGC) Web Map Service (WMS) for the GIS community. Precipitation data application services are available to support a wide variety of applications around the world. Future plans include enhanced and new services to address data-related issues from the user community. Meanwhile, the GES DISC is preparing for the Global Precipitation Measurement (GPM) mission, which is scheduled for launch in 2014. JF - Bulletin of the American Meteorological Society AU - Kempler, S AD - NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC), NASA/Goddard Space Flight Center, Greenbelt, Maryland ff4 Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 1317 EP - 1325 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 93 IS - 9 SN - 0003-0007, 0003-0007 KW - Meteorological & Geoastrophysical Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts KW - Remote Sensing KW - Satellite Technology KW - Precipitation data KW - Hydrologic analysis KW - Information services KW - Rainfall KW - Global precipitation KW - Precipitation KW - Data analysis KW - Hydrologic cycle KW - Heating KW - Oceans KW - Tropical environment KW - Geographic Information Systems (GIS) KW - Networks KW - Tropical Rainfall Measuring Mission (TRMM) KW - American Meteorological Society KW - Archives KW - Hydrologic Data KW - Geographical Information Systems KW - Q2 09243:Structure, mechanics and thermodynamics KW - SW 5080:Evaluation, processing and publication KW - M2 556:General (556) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1113240202?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Bulletin+of+the+American+Meteorological+Society&rft.atitle=Tropical+Rainfall+Measuring+Mission+%28TRMM%29+Precipitation+Data+and+Services+for+Research+and+Applications&rft.au=Kempler%2C+S&rft.aulast=Kempler&rft.aufirst=S&rft.date=2012-09-01&rft.volume=93&rft.issue=9&rft.spage=1317&rft.isbn=&rft.btitle=&rft.title=Bulletin+of+the+American+Meteorological+Society&rft.issn=00030007&rft_id=info:doi/10.1175%2FBAMS-D-11-00152.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2016-09-29 N1 - SubjectsTermNotLitGenreText - Information services; Tropical environment; Rainfall; Archives; Hydrologic cycle; Precipitation data; Hydrologic analysis; Geographic Information Systems (GIS); Global precipitation; Tropical Rainfall Measuring Mission (TRMM); American Meteorological Society; Precipitation; Data analysis; Remote Sensing; Satellite Technology; Heating; Oceans; Networks; Hydrologic Data; Geographical Information Systems DO - http://dx.doi.org/10.1175/BAMS-D-11-00152.1 ER - TY - JOUR T1 - Assessment of Environments for Mars Science Laboratory Entry, Descent, and Surface Operations AN - 1113213831; 17218325 AB - The Mars Science Laboratory mission aims to land a car-sized rover on Mars' surface and operate it for at least one Mars year in order to assess whether its field area was ever capable of supporting microbial life. Here we describe the approach used to identify, characterize, and assess environmental risks to the landing and rover surface operations. Novel entry, descent, and landing approaches will be used to accurately deliver the 900-kg rover, including the ability to sense and "fly out" deviations from a best-estimate atmospheric state. A joint engineering and science team developed methods to estimate the range of potential atmospheric states at the time of arrival and to quantitatively assess the spacecraft's performance and risk given its particular sensitivities to atmospheric conditions. Numerical models are used to calculate the atmospheric parameters, with observations used to define model cases, tune model parameters, and validate results. This joint program has resulted in a spacecraft capable of accessing, with minimal risk, the four finalist sites chosen for their scientific merit. The capability to operate the landed rover over the latitude range of candidate landing sites, and for all seasons, was verified against an analysis of surface environmental conditions described here. These results, from orbital and model data sets, also drive engineering simulations of the rover's thermal state that are used to plan surface operations. JF - Space Science Reviews AU - Vasavada, Ashwin R AU - Chen, Allen AU - Barnes, Jeffrey R AU - Burkhart, PDaniel AU - Cantor, Bruce A AU - Dwyer-Cianciolo, Alicia M AU - Fergason, Robin L AU - Hinson, David P AU - Justh, Hilary L AU - Kass, David M AU - Lewis, Stephen R AU - Mischna, Michael A AU - Murphy, James R AU - Rafkin, Scot CR AU - Tyler, Daniel AU - Withers, Paul G AD - Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA, 91109, USA, ashwin@jpl.nasa.gov Y1 - 2012/09// PY - 2012 DA - Sep 2012 SP - 793 EP - 835 PB - Springer Science+Business Media, Van Godewijckstraat 30 Dordrecht 3311 GX Netherlands VL - 170 IS - 1-4 SN - 0038-6308, 0038-6308 KW - Risk Abstracts; Meteorological & Geoastrophysical Abstracts KW - Sensitivity KW - Mars surface KW - Mathematical models KW - Numerical models KW - Numerical simulations KW - Reviews KW - Latitude KW - Simulation KW - Seasonal variability KW - Spacecraft KW - Environmental conditions KW - R2 23020:Technological risks KW - M2 523.4:Planets (523.4) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1113213831?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ariskabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Space+Science+Reviews&rft.atitle=Assessment+of+Environments+for+Mars+Science+Laboratory+Entry%2C+Descent%2C+and+Surface+Operations&rft.au=Vasavada%2C+Ashwin+R%3BChen%2C+Allen%3BBarnes%2C+Jeffrey+R%3BBurkhart%2C+PDaniel%3BCantor%2C+Bruce+A%3BDwyer-Cianciolo%2C+Alicia+M%3BFergason%2C+Robin+L%3BHinson%2C+David+P%3BJusth%2C+Hilary+L%3BKass%2C+David+M%3BLewis%2C+Stephen+R%3BMischna%2C+Michael+A%3BMurphy%2C+James+R%3BRafkin%2C+Scot+CR%3BTyler%2C+Daniel%3BWithers%2C+Paul+G&rft.aulast=Vasavada&rft.aufirst=Ashwin&rft.date=2012-09-01&rft.volume=170&rft.issue=1-4&rft.spage=793&rft.isbn=&rft.btitle=&rft.title=Space+Science+Reviews&rft.issn=00386308&rft_id=info:doi/10.1007%2Fs11214-012-9911-3 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2015-04-09 N1 - SubjectsTermNotLitGenreText - Mars surface; Numerical models; Numerical simulations; Seasonal variability; Sensitivity; Mathematical models; Reviews; Simulation; Latitude; Environmental conditions; Spacecraft DO - http://dx.doi.org/10.1007/s11214-012-9911-3 ER - TY - JOUR T1 - Hydroxyl (OH) production on airless planetary bodies; evidence from H (super +) /D (super +) ion-beam experiments AN - 1112676862; 2012-088729 AB - The hypothesis that bombardment of lunar soil with solar-wind protons might form hydroxyl (OH) and perhaps HOH has been tested by experiments with Apollo 16 (highlands) and Apollo 17 (mare) soils. Pre-dried soils (500 degrees C) were bombarded with 1.1 keV protons and deuterons and provide unambiguous evidence for the formation of OH or OD in both samples. This hypothesis further predicts the formation of hydroxyl (OH) on other airless planetary/asteroidal bodies, with a sufficient solar-wind flux. Deuteron implantation of unaltered lunar soils and a heat-treated plagioclase specimen cause simultaneous OH depletion and OD formation. Ion bombardment of lunar soils simulates the dynamic process of hydroxyl formation and may also deplete intrinsic OH, thereby effectively contributing to the day/night, diurnal variability of OH reported by Sunshine et al. (2009). Our results emphasize the need to use lunar soils with space-weathered exteriors in laboratory simulations of the solar wind. Infrared spectra of hydrogen ion-beam implanted soils are similar to spectra obtained at RELAB (Brown Univ.) and to those observed by remote sensing confirming the solar-wind hypothesis. Abstract Copyright (2012) Elsevier, B.V. JF - Earth and Planetary Science Letters AU - Ichimura, A S AU - Zent, A P AU - Quinn, R C AU - Sanchez, M R AU - Taylor, L A Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 90 EP - 94 PB - Elsevier, Amsterdam VL - 345-348 SN - 0012-821X, 0012-821X KW - silicates KW - isotopes KW - solar wind KW - Apollo Program KW - protons KW - lunar highlands KW - simulation KW - stable isotopes KW - infrared spectra KW - proton ion-beam KW - framework silicates KW - spectra KW - diurnal variations KW - deuterium KW - lunar soils KW - plagioclase KW - experimental studies KW - Moon KW - maria KW - weathering KW - hydroxyl ion KW - space weathering KW - hydrogen KW - feldspar group KW - Apollo 17 KW - Apollo 16 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1112676862?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Earth+and+Planetary+Science+Letters&rft.atitle=Hydroxyl+%28OH%29+production+on+airless+planetary+bodies%3B+evidence+from+H+%28super+%2B%29+%2FD+%28super+%2B%29+ion-beam+experiments&rft.au=Ichimura%2C+A+S%3BZent%2C+A+P%3BQuinn%2C+R+C%3BSanchez%2C+M+R%3BTaylor%2C+L+A&rft.aulast=Ichimura&rft.aufirst=A&rft.date=2012-09-01&rft.volume=345-348&rft.issue=&rft.spage=90&rft.isbn=&rft.btitle=&rft.title=Earth+and+Planetary+Science+Letters&rft.issn=0012821X&rft_id=info:doi/10.1016%2Fj.epsl.2012.06.027 L2 - http://www.sciencedirect.com/science/journal/0012821X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 50 N1 - Document feature - illus. N1 - SuppNotes - Supplementary data available in online version N1 - Last updated - 2012-10-18 N1 - CODEN - EPSLA2 N1 - SubjectsTermNotLitGenreText - Apollo 16; Apollo 17; Apollo Program; deuterium; diurnal variations; experimental studies; feldspar group; framework silicates; hydrogen; hydroxyl ion; infrared spectra; isotopes; lunar highlands; lunar soils; maria; Moon; plagioclase; proton ion-beam; protons; silicates; simulation; solar wind; space weathering; spectra; stable isotopes; weathering DO - http://dx.doi.org/10.1016/j.epsl.2012.06.027 ER - TY - JOUR T1 - Nanomaterials for Green Energy: Next-Generation Energy Conversion and Storage AN - 1093470388; 17110835 AB - The breakthroughs in next generation energy conversion and storage in thin-film and multifunctional devices depend on nanomaterials and composites, particularly with facile processing and manufacturing techniques. In recent years, several emerging technology breakthroughs have enabled unprecedented device performance when nanomaterials and devices are integrated at the converging length scales. For example, metal nanowires (NWs) incorporated in micro- or nanofluidic channels create plasmonic surface enhancement for biological and chemical sensing to at least a twofold increase in magnitude. Another exciting development is that nanomaterial assemblies are integrated with waveguides and optical fibers to improve light interactions for energy conversion in photosynthesis reactions and solar energy storage. These materials are optimized for electrical as well as optical properties in the devices. Nanostructured carbonaceous materials, semiconductor metal oxides, polymers, and metal NWs enable next-generation solar and wind energy harvesting, chemical and electrical storage, stretchable and flexible electronics, transparent electrodes, and displays. JF - IEEE Nanotechnology Magazine AU - Chen, Bin AD - NASA Ames Research Center, Moffett Field, CA 94035 USA Y1 - 2012/09// PY - 2012 DA - Sep 2012 SP - 4 EP - 7 PB - Institute of Electrical and Electronics Engineers, Inc., USA United States VL - 6 IS - 3 SN - 1932-4510, 1932-4510 KW - Sustainability Science Abstracts KW - Storage KW - Metals KW - Wind energy KW - Photosynthesis KW - Electrodes KW - Polymers KW - Solar energy KW - Nanotechnology KW - M3 1010:Issues in Sustainable Development UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1093470388?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Assamodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=IEEE+Nanotechnology+Magazine&rft.atitle=Nanomaterials+for+Green+Energy%3A+Next-Generation+Energy+Conversion+and+Storage&rft.au=Chen%2C+Bin&rft.aulast=Chen&rft.aufirst=Bin&rft.date=2012-09-01&rft.volume=6&rft.issue=3&rft.spage=4&rft.isbn=&rft.btitle=&rft.title=IEEE+Nanotechnology+Magazine&rft.issn=19324510&rft_id=info:doi/10.1109%2FMNANO.2012.2203875 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Last updated - 2015-08-05 N1 - SubjectsTermNotLitGenreText - Storage; Metals; Photosynthesis; Wind energy; Electrodes; Polymers; Solar energy; Nanotechnology DO - http://dx.doi.org/10.1109/MNANO.2012.2203875 ER - TY - JOUR T1 - Comparisons of Single- and Double-Moment Microphysics Schemes in the Simulation of a Synoptic-Scale Snowfall Event AN - 1069202485; 17155808 AB - The Canadian CloudSat/Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observations (CALIPSO) Validation Project (C3VP) provided aircraft, surface, and remotely sensed observations of cloud and precipitation characteristics to support improved simulation of cold-season precipitation within weather forecast models and new developments in satellite and radar precipitation retrievals. On 22 January 2007, the C3VP campaign executed an intensive observation period to sample widespread snowfall that occurred as a midlatitude cyclone tracked along the U.S.-Canadian border. Surface air temperature and precipitation measurements, combined with aircraft measurement of hydrometeor content and size distribution, are used to examine various assumptions and parameterizations included within four bulk water microphysics schemes available within the Weather Research and Forecasting Model (WRF). In a simulation of the 22 January 2007 event, WRF forecasts reproduced the overall precipitation pattern observed during aircraft sampling, allowing for a comparison between C3VP measurements and microphysics scheme assumptions. Single-moment schemes that provide flexibility in size distribution parameters as functions of temperature can represent much of the vertical variability observed in aircraft data, but variability is reduced in an environment where the simulated temperature profile is nearly isothermal. Double-moment prediction of total number concentration may improve the representation of ice crystal aggregation. Inclusion of both temperature dependence on distribution parameters and variability in mass-diameter or diameter-fall speed relationships suggest a means of improving upon single-moment predictions. JF - Monthly Weather Review AU - Molthan, Andrew L AU - Colle, Brian A AD - NASA Marshall Space Flight Center, Huntsville, Alabama Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 2982 EP - 3002 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 140 IS - 9 SN - 0027-0644, 0027-0644 KW - Meteorological & Geoastrophysical Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources KW - Remote Sensing KW - Prediction KW - Variability KW - Air temperature KW - Aircraft KW - Weather forecasting KW - Extratropical cyclones KW - Numerical forecasting and hydrometeors KW - Temperature effects KW - Weather KW - Satellite Technology KW - Aircraft observations KW - Temperature KW - Precipitation KW - Model Studies KW - Clouds KW - Numerical simulations KW - Hydrometeors KW - Radar KW - Precipitation patterns KW - LIDAR KW - Precipitation measurements KW - Size distribution KW - Q2 09243:Structure, mechanics and thermodynamics KW - SW 5040:Data acquisition KW - M2 551.509.1/.5:Forecasting (551.509.1/.5) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069202485?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Awaterresources&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Monthly+Weather+Review&rft.atitle=Comparisons+of+Single-+and+Double-Moment+Microphysics+Schemes+in+the+Simulation+of+a+Synoptic-Scale+Snowfall+Event&rft.au=Molthan%2C+Andrew+L%3BColle%2C+Brian+A&rft.aulast=Molthan&rft.aufirst=Andrew&rft.date=2012-09-01&rft.volume=140&rft.issue=9&rft.spage=2982&rft.isbn=&rft.btitle=&rft.title=Monthly+Weather+Review&rft.issn=00270644&rft_id=info:doi/10.1175%2FMWR-D-11-00292.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Number of references - 49 N1 - Last updated - 2016-04-29 N1 - SubjectsTermNotLitGenreText - Clouds; Temperature effects; Prediction; Hydrometeors; LIDAR; Weather forecasting; Air temperature; Size distribution; Numerical forecasting and hydrometeors; Numerical simulations; Radar; Aircraft observations; Precipitation; Precipitation patterns; Precipitation measurements; Extratropical cyclones; Remote Sensing; Satellite Technology; Weather; Variability; Aircraft; Temperature; Model Studies DO - http://dx.doi.org/10.1175/MWR-D-11-00292.1 ER - TY - JOUR T1 - Benefits for Bone From Resistance Exercise and Nutrition in Long-Duration Spaceflight: Evidence From Biochemistry and Densitometry AN - 1069200525; 17140878 AB - Exercise has shown little success in mitigating bone loss from long-duration spaceflight. The first crews of the International Space Station (ISS) used the "interim resistive exercise device" (iRED), which allowed loads of up to 297 lb sub(f) (or 1337 N) but provided little protection of bone or no greater protection than aerobic exercise. In 2008, the Advanced Resistive Exercise Device (ARED), which allowed absolute loads of up to 600 lb sub(f) (1675 N), was launched to the ISS. We report dietary intake, bone densitometry, and biochemical markers in 13 crewmembers on ISS missions from 2006 to 2009. Of these 13, 8 had access to the iRED and 5 had access to the ARED. In both groups, bone-specific alkaline phosphatase tended to increase during flight toward the end of the mission (p = 0.06) and increased 30 days after landing (p<0.001). Most markers of bone resorption were also increased in both groups during flight and 30 days after landing (p<0.05). Bone densitometry revealed significant interactions (time and exercise device) for pelvis bone mineral density (BMD) and bone mineral content (p<0.01), hip femoral neck BMD (p<0.05), trochanter BMD (p<0.05), and total hip BMD (p<0.05). These variables were unchanged from preflight only for ARED crewmembers, who also returned from flight with higher percent lean mass and lower percent fat mass. Body mass was unchanged after flight in both groups. All crewmembers had nominal vitamin D status (75 plus or minus 17 nmol/L) before and during flight. These data document that resistance exercise, coupled with adequate energy intake (shown by maintenance of body mass determined by dual-energy X-ray absorptiometry [DXA]) and vitamin D, can maintain bone in most regions during 4- to 6-month missions in microgravity. This is the first evidence that improving nutrition and resistance exercise during spaceflight can attenuate the expected BMD deficits previously observed after prolonged missions. JF - Journal of Bone and Mineral Research AU - Smith, S M AU - Heer, MA AU - Shackelford, L C AU - Sibonga, J D AU - Ploutz-Snyder, L AU - Zwart AD - NASA Johnson Space Center, Attn: Mail Code SK3, 2101 NASA Parkway, Houston, TX 77058, USA, scott.m.smith@nasa.gov Y1 - 2012/09// PY - 2012 DA - Sep 2012 SP - 1896 EP - 1906 VL - 27 IS - 9 SN - 0884-0431, 0884-0431 KW - Physical Education Index; Calcium & Calcified Tissue Abstracts KW - Bones KW - Body mass KW - Dual energy X-ray absorptiometry KW - Energy intake KW - Landing behavior KW - Dietary intake KW - Nutrition KW - Bone mineral density KW - Vitamins KW - Bone mineral content KW - Bone resorption KW - Bone mass KW - Densitometry KW - Space flight KW - Trochanter KW - Exercise KW - Resistance exercise KW - Hips KW - Physical training KW - Microgravity KW - Pelvis KW - Vitamin D KW - Alkaline phosphatase KW - Work load KW - Hip KW - T 2025:Bone and Bone Diseases KW - PE 030:Exercise, Health & Physical Fitness UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069200525?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aphysicaleducation&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Bone+and+Mineral+Research&rft.atitle=Benefits+for+Bone+From+Resistance+Exercise+and+Nutrition+in+Long-Duration+Spaceflight%3A+Evidence+From+Biochemistry+and+Densitometry&rft.au=Smith%2C+S+M%3BHeer%2C+MA%3BShackelford%2C+L+C%3BSibonga%2C+J+D%3BPloutz-Snyder%2C+L%3BZwart&rft.aulast=Smith&rft.aufirst=S&rft.date=2012-09-01&rft.volume=27&rft.issue=9&rft.spage=1896&rft.isbn=&rft.btitle=&rft.title=Journal+of+Bone+and+Mineral+Research&rft.issn=08840431&rft_id=info:doi/10.1002%2Fjbmr.1647 LA - English DB - Physical Education Index N1 - Date revised - 2012-09-01 N1 - Last updated - 2014-12-24 N1 - SubjectsTermNotLitGenreText - Bones; Bone mineral density; Body mass; Vitamins; Work load; Resistance exercise; Exercise; Nutrition; Hips; Space flight; Trochanter; Energy intake; Dual energy X-ray absorptiometry; Landing behavior; Dietary intake; Physical training; Pelvis; Microgravity; Alkaline phosphatase; Vitamin D; Bone mineral content; Bone resorption; Bone mass; Densitometry; Hip DO - http://dx.doi.org/10.1002/jbmr.1647 ER - TY - JOUR T1 - Interactions of fire emissions and urban pollution over California: Ozone formation and air quality simulations AN - 1024666602; 16855149 AB - An instrumented DC-8 aircraft was employed to perform airborne observations in rural and urban environs of California during the summer 2008 NASA ARCTAS-CARB campaign. The fortuitous occurrence of large wildfire episodes in Northern California allowed for studies of fire emissions, their composition, and their interactions with rural and urban air. Relative to CO, emissions of HCN were shown to vary non-linearly with fire characteristics while those of CH3CN were nearly unchanged, making the latter a superior quantitative tracer of biomass combustion. Although some fire plumes over California contained little NOx and virtually no O3 enhancement, others contained ample VOCs and sufficient NOx, largely from urban influences, to result in significant ozone formation. The highest observed O3 mixing ratios (170 ppb) were also in fire-influenced urban air masses. Attempts to simulate these interactions using CMAQ, a high-resolution state of the art air quality model, were only minimally successful and indicated several shortcomings in simulating fire emission influences on urban smog formation. A variety of secondary oxidation products (e.g. O3, PAN, HCHO) were substantially underestimated in fire-influenced air masses. Available data involving fire plumes and anthropogenic pollution interactions are presently quite sparse and additional observational and mechanistic studies are needed. JF - Atmospheric Environment AU - Singh, H B AU - Cai, C AU - Kaduwela, A AU - Weinheimer, A AU - Wisthaler, A AD - NASA Ames Research Center, Moffett Field, CA, USA Hanwant.b.singh@nasa.gov Y1 - 2012/09// PY - 2012 DA - September 2012 SP - 45 EP - 51 PB - Elsevier B.V., P.O. Box 211 Amsterdam 1000 AE Netherlands VL - 56 SN - 1352-2310, 1352-2310 KW - Environmental Engineering Abstracts (EN); CSA / ASCE Civil Engineering Abstracts (CE); Aerospace & High Technology Database (AH) KW - Air pollution KW - Air masses KW - Fires KW - Computer simulation KW - Pollution abatement KW - Air quality KW - Rural KW - Ozone UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1024666602?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aenvironmentalengabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Environment&rft.atitle=Interactions+of+fire+emissions+and+urban+pollution+over+California%3A+Ozone+formation+and+air+quality+simulations&rft.au=Singh%2C+H+B%3BCai%2C+C%3BKaduwela%2C+A%3BWeinheimer%2C+A%3BWisthaler%2C+A&rft.aulast=Singh&rft.aufirst=H&rft.date=2012-09-01&rft.volume=56&rft.issue=&rft.spage=45&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Environment&rft.issn=13522310&rft_id=info:doi/10.1016%2Fj.atmosenv.2012.03.046 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Number of references - 2 N1 - Last updated - 2016-08-08 DO - http://dx.doi.org/10.1016/j.atmosenv.2012.03.046 ER - TY - JOUR T1 - Understanding differences in upper stratospheric ozone response to changes in chlorine and temperature as computed using CCMVal-2 models AN - 1093444242; 17111793 AB - Projections of future ozone levels are made using models that couple a general circulation model with a representation of atmospheric photochemical processes, allowing interactions among photochemical processes, radiation, and dynamics. Such models are known as coupled chemistry-climate models (CCMs). Although developed from common principles and subject to the same boundary conditions, simulated ozone time series vary among models for scenarios for ozone depleting substances (ODSs) and greenhouse gases. Photochemical processes control the upper stratospheric ozone level, and there is broad agreement among CCMs in that ozone increases as ODSs decrease and temperature decreases due to greenhouse gas increase. There are quantitative differences in the ozone sensitivity to chlorine and temperature. We obtain insight into differences in sensitivity by examining the relationship between the upper stratospheric seasonal cycles of ozone and temperature as produced by fourteen CCMs. All simulations conform to expectation in that ozone is less sensitive to temperature when chlorine levels are highest because chlorine catalyzed loss is nearly independent of temperature. Analysis reveals differences in simulated temperature, ozone and reactive nitrogen that lead to differences in the relative importance of ozone loss processes and are most obvious when chlorine levels are close to background. Differences in the relative importance of loss processes underlie differences in simulated sensitivity of ozone to composition change. This suggests 1) that the multimodel mean is not a best estimate of the sensitivity of upper stratospheric ozone to changes in ODSs and temperature; and 2) that the spread of values is not an appropriate measure of uncertainty. JF - Journal of Geophysical Research. Atmospheres AU - Douglass, A R AU - Stolarski, R S AU - Strahan, SE AU - Oman, L D AD - NASA Goddard Space Flight Center, Greenbelt, Maryland, USA Y1 - 2012/08/18/ PY - 2012 DA - 2012 Aug 18 PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 117 IS - D16 SN - 2169-897X, 2169-897X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - Sensitivity KW - Atmospheric pollution models KW - Ozone in stratosphere KW - Temperature KW - Chlorine KW - Time series analysis KW - Atmospheric circulation-oceanic circulation coupled models KW - Stratosphere KW - Ozone depletion KW - Photochemicals KW - Radiation KW - General circulation models KW - Future ozone levels KW - Greenhouse gases KW - Seasonal variations KW - Ozone KW - M2 551.510.42:Air Pollution (551.510.42) KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1093444242?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Geophysical+Research.+Atmospheres&rft.atitle=Understanding+differences+in+upper+stratospheric+ozone+response+to+changes+in+chlorine+and+temperature+as+computed+using+CCMVal-2+models&rft.au=Douglass%2C+A+R%3BStolarski%2C+R+S%3BStrahan%2C+SE%3BOman%2C+L+D&rft.aulast=Douglass&rft.aufirst=A&rft.date=2012-08-18&rft.volume=117&rft.issue=D16&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Journal+of+Geophysical+Research.+Atmospheres&rft.issn=2169897X&rft_id=info:doi/10.1029%2F2012JD017483 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-10-01 N1 - Number of references - 61 N1 - Last updated - 2014-04-17 N1 - SubjectsTermNotLitGenreText - Ozone depletion; Atmospheric pollution models; Radiation; Ozone in stratosphere; General circulation models; Future ozone levels; Atmospheric circulation-oceanic circulation coupled models; Time series analysis; Greenhouse gases; Sensitivity; Photochemicals; Temperature; Chlorine; Seasonal variations; Stratosphere; Ozone DO - http://dx.doi.org/10.1029/2012JD017483 ER - TY - JOUR T1 - Comparison of CALIPSO aerosol optical depth retrievals to AERONET measurements, and a climatology for the lidar ratio of dust AN - 1069196329; 17152491 AB - We compared CALIPSO column aerosol optical depths at 0.532 mu m to measurements at 147 AERONET sites, synchronized to within 30 min of satellite overpass times during a 3-yr period. We found 677 suitable overpasses, and a CALIPSO bias of -13% relative to AERONET for the entire data set; the corresponding absolute bias is -0.029, and the standard deviation of the mean (SDOM) is 0.014. Consequently, the null hypothesis is rejected at the 97% confidence level, indicating a statistically significant difference between the datasets. However, if we omit CALIPSO columns that contain dust from our analysis, the relative and absolute biases are reduced to -3% and -0.005 with a standard error of 0.016 for 449 overpasses, and the statistical confidence level for the null hypothesis rejection is reduced to 27%. We also analyzed the results according to the six CALIPSO aerosol subtypes and found relative and absolute biases of -29% and -0.1 for atmospheric columns that contain the dust subtype exclusively, but with a relatively high correlation coefficient of R = 0.58; this indicates the possibility that the assumed lidar ratio (40 sr) for the CALIPSO dust retrievals is too low. Hence, we used the AERONET size distributions, refractive indices, percent spheres, and forward optics code for spheres and spheroids to compute a lidar ratio climatology for AERONET sites located in the dust belt. The highest lidar ratios of our analysis occur in the non-Sahel regions of Northern Africa, where the median lidar ratio at 0.532 mu m is 55.4 sr for 229 retrievals. Lidar ratios are somewhat lower in the African Sahel (49.7 sr for 929 retrievals), the Middle East (42.6 sr for 489 retrievals), and Kanpur, India (43.8 sr for 67 retrievals). We attribute this regional variability in the lidar ratio to the regional variability of the real refractive index of dust, as these two parameters are highly anti-correlated (correlation coefficients range from -0.51 to -0.85 for the various regions). The AERONET refractive index variability is consistent with the variability of illite concentration in dust across the dust belt. JF - Atmospheric Chemistry and Physics AU - Schuster, G L AU - Vaughan, M AU - MacDonnell, D AU - Su, W AU - Winker, D AU - Dubovik, O AU - Lapyonok, T AU - Trepte, C AD - NASA Langley Research Center, Hampton, Virginia, USA Y1 - 2012/08/17/ PY - 2012 DA - 2012 Aug 17 SP - 7431 EP - 7452 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 16 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts KW - Remote Sensing KW - Variability KW - Correlation Coefficient KW - Statistical analysis KW - Correlations KW - India KW - Spatial variations KW - Standard Deviation KW - Spheres KW - India, Uttar Pradesh, Unnao Dist., Kanpur KW - Climatology KW - Refractive index KW - Middle East KW - Aerosol Robotic Network (AERONET) KW - Satellite Technology KW - Atmospheric particulates KW - Aerosols KW - Dusts KW - Lidar applications KW - Atmospheric chemistry KW - Africa KW - Standards KW - Optical depth of aerosols KW - LIDAR KW - Eolian dust KW - SW 5010:Network design KW - Q2 09223:Optical properties KW - M2 551.510.42:Air Pollution (551.510.42) KW - AQ 00003:Monitoring and Analysis of Water and Wastes UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069196329?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=Comparison+of+CALIPSO+aerosol+optical+depth+retrievals+to+AERONET+measurements%2C+and+a+climatology+for+the+lidar+ratio+of+dust&rft.au=Schuster%2C+G+L%3BVaughan%2C+M%3BMacDonnell%2C+D%3BSu%2C+W%3BWinker%2C+D%3BDubovik%2C+O%3BLapyonok%2C+T%3BTrepte%2C+C&rft.aulast=Schuster&rft.aufirst=G&rft.date=2012-08-17&rft.volume=12&rft.issue=16&rft.spage=7431&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Last updated - 2016-04-29 N1 - SubjectsTermNotLitGenreText - Spatial variations; Atmospheric particulates; Aerosols; Spheres; Climatology; Refractive index; LIDAR; Eolian dust; Aerosol Robotic Network (AERONET); Atmospheric chemistry; Lidar applications; Correlations; Statistical analysis; Optical depth of aerosols; Remote Sensing; Satellite Technology; Correlation Coefficient; Variability; Standard Deviation; Standards; Dusts; India, Uttar Pradesh, Unnao Dist., Kanpur; Africa; Middle East; India ER - TY - NEWS T1 - Opportunity Runs the First Martian Marathon AN - 1034250479 JF - UPI Space Daily AU - Dauna Coulter for NASA Science News Y1 - 2012/08/15/ PY - 2012 DA - 2012 Aug 15 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1034250479?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Opportunity+Runs+the+First+Martian+Marathon&rft.au=Dauna+Coulter+for+NASA+Science+News&rft.aulast=Dauna+Coulter+for+NASA+Science+News&rft.aufirst=&rft.date=2012-08-15&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-08-20 ER - TY - NEWS T1 - Inflatable Spacecraft Heat Shield Set to Launch AN - 1033238782 JF - UPI Space Daily AU - Kathy Barnstorff for Langley Research Center Y1 - 2012/08/13/ PY - 2012 DA - 2012 Aug 13 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1033238782?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Inflatable+Spacecraft+Heat+Shield+Set+to+Launch&rft.au=Kathy+Barnstorff+for+Langley+Research+Center&rft.aulast=Kathy+Barnstorff+for+Langley+Research+Center&rft.aufirst=&rft.date=2012-08-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-08-14 ER - TY - NEWS T1 - NASA's Landsat Data Continuity Mission Becomes an Observatory AN - 1033125601 JF - UPI Space Daily AU - Rani Gran for NASA Earth Science News Y1 - 2012/08/13/ PY - 2012 DA - 2012 Aug 13 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1033125601?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=NASA%27s+Landsat+Data+Continuity+Mission+Becomes+an+Observatory&rft.au=Rani+Gran+for+NASA+Earth+Science+News&rft.aulast=Rani+Gran+for+NASA+Earth+Science+News&rft.aufirst=&rft.date=2012-08-13&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-08-13 ER - TY - JOUR T1 - DUST IN A TYPE Ia SUPERNOVA PROGENITOR: SPITZER SPECTROSCOPY OF KEPLER'S SUPERNOVA REMNANT AN - 1701490519; PQ0001745738 AB - Characterization of the relatively poorly understood progenitor systems of Type Ia supernovae is of great importance in astrophysics, particularly given the important cosmological role that these supernovae play. Kepler's supernova remnant, the result of a Type Ia supernova, shows evidence for an interaction with a dense circumstellar medium (CSM), suggesting a single-degenerate progenitor system. We present 7.5-38 mu m infrared (IR) spectra of the remnant, obtained with the Spitzer Space Telescope, dominated by emission from warm dust. Broad spectral features at 10 and 18 mu m, consistent with various silicate particles, are seen throughout. These silicates were likely formed in the stellar outflow from the progenitor system during the asymptotic giant branch stage of evolution, and imply an oxygen-rich chemistry. In addition to silicate dust, a second component, possibly carbonaceous dust, is necessary to account for the short-wavelength Infrared Spectrograph and Infrared Array Camera data. This could imply a mixed chemistry in the atmosphere of the progenitor system. However, non-spherical metallic iron inclusions within silicate grains provide an alternative solution. Models of collisionally heated dust emission from fast shocks (>1000 km s super(-1)) propagating into the CSM can reproduce the majority of the emission associated with non-radiative filaments, where dust temperatures are ~80-100 K, but fail to account for the highest temperatures detected, in excess of 150 K. We find that slower shocks (a few hundred km s super(-1)) into moderate density material (n sub(0) ~ 50-250 cm super(-3)) are the only viable source of heating for this hottest dust. We confirm the finding of an overall density gradient, with densities in the north being an order of magnitude greater than those in the south. JF - Astrophysical Journal AU - Williams, Brian J AU - Borkowski, Kazimierz J AU - Reynolds, Stephen P AU - Ghavamian, Parviz AU - Blair, William P AU - Long, Knox S AU - SANKRIT, RAVI AD - Physics Department, North Carolina State University, Raleigh, NC 27695-8202, USA; NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; Oak Ridge Associated Universities (ORAU), Oak Ridge, TN 37831, USA, brian.j.williams@nasa.gov Y1 - 2012/08/10/ PY - 2012 DA - 2012 Aug 10 SP - 1 EP - 8 PB - IOP Publishing, The Public Ledger Building, Suite 929 Philadelphia PA 19106 United States VL - 755 IS - 1 SN - 0004-637X, 0004-637X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - dust, extinction KW - ISM: supernova remnants KW - stars: AGB and post-AGB KW - Atmospheric pollution models KW - Supernova KW - Temperature KW - Outflow KW - Particulates KW - Spectroscopy KW - Atmosphere KW - Dust KW - Dust emission KW - Telescopes KW - Cosmology KW - Stellar evolution KW - Emissions KW - Stellar investigations KW - Supernova remnants KW - Grains KW - Iron KW - P 0000:AIR POLLUTION KW - M2 524:Stars, Universe (524) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1701490519?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrophysical+Journal&rft.atitle=DUST+IN+A+TYPE+Ia+SUPERNOVA+PROGENITOR%3A+SPITZER+SPECTROSCOPY+OF+KEPLER%27S+SUPERNOVA+REMNANT&rft.au=Williams%2C+Brian+J%3BBorkowski%2C+Kazimierz+J%3BReynolds%2C+Stephen+P%3BGhavamian%2C+Parviz%3BBlair%2C+William+P%3BLong%2C+Knox+S%3BSANKRIT%2C+RAVI&rft.aulast=Williams&rft.aufirst=Brian&rft.date=2012-08-10&rft.volume=755&rft.issue=1&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F755%2F1%2F3 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-08-01 N1 - Last updated - 2015-11-16 N1 - SubjectsTermNotLitGenreText - Telescopes; Atmospheric pollution models; Cosmology; Stellar evolution; Supernova; Stellar investigations; Supernova remnants; Spectroscopy; Dust emission; Outflow; Temperature; Emissions; Particulates; Grains; Atmosphere; Iron; Dust DO - http://dx.doi.org/10.1088/0004-637X/755/1/3 ER - TY - JOUR T1 - Steady-state dissolution kinetics of mineral ferric phosphate in the presence of desferrioxamine-B and oxalate ligands at pH=4-6 and T=24+ or -0.6 degrees C AN - 1033534034; 2012-075141 AB - Ferric phosphate (FePO (sub 4) .2H (sub 2) O) is one of the most common secondary phosphate minerals in the environment. Nevertheless, few studies address the biological dissolution mechanism(s) of FePO (sub 4) .2H (sub 2) O. This paper reports steady-state dissolution rates of synthetic FePO (sub 4) .2H (sub 2) O at 4500 h). Typical effluent-flow rate was maintained at 0.10+ or -0.01 mL min (super -1) . The measured dissolution rate of FePO (sub 4) .2H (sub 2) O by DFO-B and Ox, R (sub DFO-Ox) (super Obs) , was compared to the sum of dissolution rates by DFO-B (R (sub DFO-B) ) or Ox (R (sub Ox) ), R (sub DFO-Ox) (super Sum) (R (sub DFO-Ox) (super Sum) =R (sub DFO-B) +R (sub Ox) ). Results were analyzed using the t student test. Obtained data values with p< or =0.05 ( (super I) ) and < or =0.01 ( (super II) ) were considered to differ statistically from control experiments. Dissolution rates by DFO-B (R (sub DFO-B) ) increased with [DFOB] (sub 0) , and no evidence of surface masking became apparent. By contrast, dissolution rates by Ox (R (sub Ox) ) varied with [Ox] (sub 0) and pH (sub 0) . The kinetics of dissolution by Ox was not explained by a first-order mineral dissolution behavior. Dissolution rates by DFO-B and Ox (R (sub DFO-Ox) (super Obs) ) surpassed R (sub DFO-B) or R (sub Ox) , and increased with proton activity. Reacting FePO (sub 4) .2H (sub 2) O with DFO-B and high amounts of Ox resulted in higher values for R (sub DFO-Ox) (super Obs) relative to R (sub DFO-B) . Observed (R (sub DFO-Ox) (super Obs) ) to calculated (R (sub DFO-Ox) (super Sum) =R (sub DFO-B) +R (sub Ox) ) ratio was found to be highest at [DFOB] (sub 0) =50mu M and [Ox] (sub 0) =49mu M. Increases in the proton activity favors the dissolution of FePO (sub 4) .2H (sub 2) O by DFO-B and Ox, explained because the sequestration of Fe(III) at the surface vicinity in the form of adsorbed Fe(III)-oxalate complexes. A direct comparison between the dissolution behavior of FePO (sub 4) .2H (sub 2) O by DFO-B and Ox against those for goethite (alpha -FeOOH) and Al goethite (AlFeOOH) was conducted. The dissolution behavior was found to be a function of the mineral structure. R (sub DFO-B) values for FePO (sub 4) .2H (sub 2) O by 22.5mu M DFO-B surpassed those for alpha -FeOOH or alpha -AlFeOOH by 20mu M DFO-B, namely, 37, and 11.6 and 3-5mu molkg (super -1) h (super -1) , respectively. R (sub Ox) values for FePO (sub 4) .2H (sub 2) O by 49mM Ox surpassed that for alpha -FeOOH by 70mu M Ox or alpha -AlFeOOH by 50mu M Ox, namely, i.e., 12, and 0.7 and 0.1mu molkg (super -1) h (super -1) . The latter results agree with the idea of the inhibition of Fe release in goethite because its sequestration in the form of adsorbed Fe(III) oxalate complexes. In contrast, a different scenario holds true for dissolution by 50mu M DFO-B and 49mu M Ox. The dissolution rates for FePO (sub 4) .2H (sub 2) O, alpha -FeOOH, and alpha -AlFeOOH correspond to 50, and 39-42 and 71-129mu molkg (super -1) h (super -1) , respectively. The high extent of iron release from Al goethite is best explained because high-energy surface sites formed after Al substitution in goethite. JF - Chemical Geology AU - Cervini-Silva, Javiera AU - Kearns, Josh AU - Banfield, Jillian Y1 - 2012/08/06/ PY - 2012 DA - 2012 Aug 06 SP - 1 EP - 8 PB - Elsevier, Amsterdam VL - 320-321 SN - 0009-2541, 0009-2541 KW - mass spectra KW - oxalates KW - iron KW - temperature KW - ferric iron KW - ligands KW - chemical reactions KW - phase equilibria KW - spectra KW - thermodynamic properties KW - chemical composition KW - kinetics KW - synthetic materials KW - pH KW - experimental studies KW - biochemistry KW - statistical analysis KW - prediction KW - phosphates KW - solubility KW - models KW - ICP mass spectra KW - biogenic processes KW - metals KW - steady-state processes KW - crystal chemistry KW - 01C:Mineralogy of non-silicates KW - 02A:General geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1033534034?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Chemical+Geology&rft.atitle=Steady-state+dissolution+kinetics+of+mineral+ferric+phosphate+in+the+presence+of+desferrioxamine-B+and+oxalate+ligands+at+pH%3D4-6+and+T%3D24%2B+or+-0.6+degrees+C&rft.au=Cervini-Silva%2C+Javiera%3BKearns%2C+Josh%3BBanfield%2C+Jillian&rft.aulast=Cervini-Silva&rft.aufirst=Javiera&rft.date=2012-08-06&rft.volume=320-321&rft.issue=&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Chemical+Geology&rft.issn=00092541&rft_id=info:doi/10.1016%2Fj.chemgeo.2012.05.022 L2 - http://www.sciencedirect.com/science/journal/00092541 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2012-01-01 N1 - Number of references - 61 N1 - Document feature - illus. incl. 4 tables N1 - Last updated - 2012-08-16 N1 - CODEN - CHGEAD N1 - SubjectsTermNotLitGenreText - biochemistry; biogenic processes; chemical composition; chemical reactions; crystal chemistry; experimental studies; ferric iron; ICP mass spectra; iron; kinetics; ligands; mass spectra; metals; models; oxalates; pH; phase equilibria; phosphates; prediction; solubility; spectra; statistical analysis; steady-state processes; synthetic materials; temperature; thermodynamic properties DO - http://dx.doi.org/10.1016/j.chemgeo.2012.05.022 ER - TY - JOUR T1 - Development and refinement of proxy-climate indicators from peats AN - 1529792158; 2014-035658 AB - Peat, especially from acidic mires (bogs), is a natural archive of past environmental change. Reconstructions of past climate from bogs commenced in the 19th Century through examination of visible peat stratigraphy, and later formed the basis for a postglacial climatic scheme widely used in Northwest Europe. Nevertheless, misconceptions as to how bogs grow led to a 50-year lacuna in peat-climate study, before the concept of 'cyclic regeneration' in bogs was refuted. In recent decades, research using proxy-climate indicators from bogs has burgeoned. A range of proxies for past hydrological change has been developed, as well as use of pollen, bog oaks and pines and other data to reconstruct past temperatures. Most of this proxy-climate research has been carried out in Northern Europe, but peat-based research in parts of Asia and North America has increased, particularly during the last decade, while research has also been conducted in Australia, New Zealand and South America. This paper reviews developments in proxy-climate reconstructions from peatlands; chronicles use of a range of palaeo-proxies such as visible peat stratigraphy, plant macrofossils, peat humification, testate amoebae and non-pollen palynomorphs; and explains the use of wiggle-match radiocarbon dating and relationship to climate shifts. It details other techniques being used increasingly, such as biomarkers, stable-isotopes, inorganic geochemistry and estimation of dust flux; and points to new proxies under development. Although explicit protocols have been developed recently for research on ombrotrophic mires, it must be recognised that not all proxies and techniques have universal applicability, owing to differences in species assemblages, mire formation, topographic controls, and geochemical characteristics. JF - Quaternary International AU - Chambers, Frank M AU - Booth, Robert K AU - de Vleeschouwer, Francois AU - Lamentowicz, Mariusz AU - Le Roux, Gael AU - Mauquoy, Dmitri AU - Nichols, Jonathan E AU - van Geel, Bas Y1 - 2012/08/03/ PY - 2012 DA - 2012 Aug 03 SP - 21 EP - 33 PB - Elsevier, Oxford VL - 268 SN - 1040-6182, 1040-6182 KW - peatlands KW - isotopes KW - moisture KW - humification KW - paleoclimatology KW - stable isotopes KW - climate change KW - ground water KW - radioactive isotopes KW - pollen KW - paleotemperature KW - carbon KW - sediments KW - miospores KW - geochemistry KW - bogs KW - Plantae KW - clastic sediments KW - biostratigraphy KW - paleohydrology KW - biomarkers KW - inorganic materials KW - water table KW - peat KW - organic compounds KW - mires KW - palynomorphs KW - dust KW - trees KW - reconstruction KW - C-14 KW - microfossils KW - microorganisms KW - 24:Quaternary geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1529792158?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Quaternary+International&rft.atitle=Development+and+refinement+of+proxy-climate+indicators+from+peats&rft.au=Chambers%2C+Frank+M%3BBooth%2C+Robert+K%3Bde+Vleeschouwer%2C+Francois%3BLamentowicz%2C+Mariusz%3BLe+Roux%2C+Gael%3BMauquoy%2C+Dmitri%3BNichols%2C+Jonathan+E%3Bvan+Geel%2C+Bas&rft.aulast=Chambers&rft.aufirst=Frank&rft.date=2012-08-03&rft.volume=268&rft.issue=&rft.spage=21&rft.isbn=&rft.btitle=&rft.title=Quaternary+International&rft.issn=10406182&rft_id=info:doi/10.1016%2Fj.quaint.2011.04.039 L2 - http://www.sciencedirect.com/science/journal/10406182 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2014-01-01 N1 - Number of references - 166 N1 - Document feature - illus. incl. 1 table, sect. N1 - Last updated - 2014-05-29 N1 - SubjectsTermNotLitGenreText - biomarkers; biostratigraphy; bogs; C-14; carbon; clastic sediments; climate change; dust; geochemistry; ground water; humification; inorganic materials; isotopes; microfossils; microorganisms; miospores; mires; moisture; organic compounds; paleoclimatology; paleohydrology; paleotemperature; palynomorphs; peat; peatlands; Plantae; pollen; radioactive isotopes; reconstruction; sediments; stable isotopes; trees; water table DO - http://dx.doi.org/10.1016/j.quaint.2011.04.039 ER - TY - JOUR T1 - Aerosols from overseas rival domestic emissions over North America AN - 1080608151; 2012-084263 AB - Many types of aerosols have lifetimes long enough for their transcontinental transport, making them potentially important contributors to air quality and climate change in remote locations. We estimate that the mass of aerosols arriving at North American shores from overseas is comparable with the total mass of particulates emitted domestically. Curbing domestic emissions of particulates and precursor gases, therefore, is not sufficient to mitigate aerosol impacts in North America. The imported contribution is dominated by dust leaving Asia, not by combustion-generated particles. Thus, even a reduction of industrial emissions of the emerging economies of Asia could be overwhelmed by an increase of dust emissions due to changes in meteorological conditions and potential desertification. JF - Science AU - Yu, Hongbin AU - Remer, Lorraine A AU - Chin, Mian AU - Bian, Huisheng AU - Tan, Qian AU - Yuan, Tianle AU - Zhang, Yan Y1 - 2012/08/03/ PY - 2012 DA - 2012 Aug 03 SP - 566 EP - 569 PB - American Association for the Advancement of Science, Washington, DC VL - 337 IS - 6094 SN - 0036-8075, 0036-8075 KW - North America KW - clastic sediments KW - GOCART KW - pollution KW - desertification KW - satellite methods KW - air pollution KW - transport KW - atmospheric transport KW - dust KW - sediments KW - aerosols KW - particulate materials KW - Asia KW - remote sensing KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080608151?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Aerosols+from+overseas+rival+domestic+emissions+over+North+America&rft.au=Yu%2C+Hongbin%3BRemer%2C+Lorraine+A%3BChin%2C+Mian%3BBian%2C+Huisheng%3BTan%2C+Qian%3BYuan%2C+Tianle%3BZhang%2C+Yan&rft.aulast=Yu&rft.aufirst=Hongbin&rft.date=2012-08-03&rft.volume=337&rft.issue=6094&rft.spage=566&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1217576 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 28 N1 - PubXState - DC N1 - Document feature - illus. incl. sketch maps N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-09-27 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - aerosols; air pollution; Asia; atmospheric transport; clastic sediments; desertification; dust; GOCART; North America; particulate materials; pollution; remote sensing; satellite methods; sediments; transport DO - http://dx.doi.org/10.1126/science.1217576 ER - TY - JOUR T1 - Kepler-36; a pair of planets with neighboring orbits and dissimilar densities AN - 1080608137; 2012-084262 AB - In the solar system, the planets' compositions vary with orbital distance, with rocky planets in close orbits and lower-density gas giants in wider orbits. The detection of close-in giant planets around other stars was the first clue that this pattern is not universal and that planets' orbits can change substantially after their formation. Here, we report another violation of the orbit-composition pattern: two planets orbiting the same star with orbital distances differing by only 10% and densities differing by a factor of 8. One planet is likely a rocky "super-Earth," whereas the other is more akin to Neptune. These planets are 20 times more closely spaced and have a larger density contrast than any adjacent pair of planets in the solar system. JF - Science AU - Carter, Joshua A AU - Agol, Eric AU - Chaplin, William J AU - Basu, Sarbani AU - Bedding, Timothy R AU - Buchhave, Lars A AU - Christensen-Dalsgaard, Jorgen AU - Deck, Katherine M AU - Elsworth, Yvonne AU - Fabrycky, Daniel C AU - Ford, Eric B AU - Fortney, Jonathan J AU - Hale, Steven J AU - Handberg, Rasmus AU - Hekker, Saskia AU - Holman, Matthew J AU - Huber, Daniel AU - Karoff, Christopher AU - Kawaler, Steven D AU - Kjeldsen, Hans AU - Lissauer, Jack J AU - Lopez, Eric D AU - Lund, Mikkel N AU - Lundkvist, Mia AU - Metcalfe, Travis S AU - Miglio, Andrea AU - Rogers, Leslie A AU - Stello, Dennis AU - Borucki, William J AU - Bryson, Steve AU - Christiansen, Jessie L AU - Cochran, William D AU - Geary, John C AU - Gilliland, Ronald L AU - Haas, Michael R AU - Hall, Jennifer AU - Howard, Andrew W AU - Jenkins, Jon M AU - Klaus, Todd AU - Koch, David G AU - Latham, David W AU - MacQueen, Phillip J AU - Sasselov, Dimitar AU - Steffen, Jason H AU - Twicken, Joseph D AU - Winn, Joshua N Y1 - 2012/08/03/ PY - 2012 DA - 2012 Aug 03 SP - 556 EP - 559 PB - American Association for the Advancement of Science, Washington, DC VL - 337 IS - 6094 SN - 0036-8075, 0036-8075 KW - models KW - mass KW - planets KW - Kepler 36 KW - extrasolar planets KW - density KW - stars KW - orbits KW - planetology KW - interplanetary comparison KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080608137?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=Kepler-36%3B+a+pair+of+planets+with+neighboring+orbits+and+dissimilar+densities&rft.au=Carter%2C+Joshua+A%3BAgol%2C+Eric%3BChaplin%2C+William+J%3BBasu%2C+Sarbani%3BBedding%2C+Timothy+R%3BBuchhave%2C+Lars+A%3BChristensen-Dalsgaard%2C+Jorgen%3BDeck%2C+Katherine+M%3BElsworth%2C+Yvonne%3BFabrycky%2C+Daniel+C%3BFord%2C+Eric+B%3BFortney%2C+Jonathan+J%3BHale%2C+Steven+J%3BHandberg%2C+Rasmus%3BHekker%2C+Saskia%3BHolman%2C+Matthew+J%3BHuber%2C+Daniel%3BKaroff%2C+Christopher%3BKawaler%2C+Steven+D%3BKjeldsen%2C+Hans%3BLissauer%2C+Jack+J%3BLopez%2C+Eric+D%3BLund%2C+Mikkel+N%3BLundkvist%2C+Mia%3BMetcalfe%2C+Travis+S%3BMiglio%2C+Andrea%3BRogers%2C+Leslie+A%3BStello%2C+Dennis%3BBorucki%2C+William+J%3BBryson%2C+Steve%3BChristiansen%2C+Jessie+L%3BCochran%2C+William+D%3BGeary%2C+John+C%3BGilliland%2C+Ronald+L%3BHaas%2C+Michael+R%3BHall%2C+Jennifer%3BHoward%2C+Andrew+W%3BJenkins%2C+Jon+M%3BKlaus%2C+Todd%3BKoch%2C+David+G%3BLatham%2C+David+W%3BMacQueen%2C+Phillip+J%3BSasselov%2C+Dimitar%3BSteffen%2C+Jason+H%3BTwicken%2C+Joseph+D%3BWinn%2C+Joshua+N&rft.aulast=Carter&rft.aufirst=Joshua&rft.date=2012-08-03&rft.volume=337&rft.issue=6094&rft.spage=556&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1223269 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 29 N1 - PubXState - DC N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-09-27 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - density; extrasolar planets; interplanetary comparison; Kepler 36; mass; models; orbits; planetology; planets; stars DO - http://dx.doi.org/10.1126/science.1223269 ER - TY - JOUR T1 - Precipitation response to regional radiative forcing AN - 1069201749; 17143960 AB - Precipitation shifts can have large impacts on human society and ecosystems. Many aspects of how inhomogeneous radiative forcings influence precipitation remain unclear, however. Here we investigate regional precipitation responses to various forcings imposed in different latitude bands in a climate model. We find that several regions show strong, significant responses to most forcings, but that the magnitude and even the sign depends upon the forcing location and type. Aerosol and ozone forcings typically induce larger responses than equivalent carbon dioxide (CO sub(2)) forcing, and the influence of remote forcings often outweighs that of local forcings. Consistent with this, ozone and especially aerosols contribute greatly to precipitation changes over the Sahel and South and East Asia in historical simulations, and inclusion of aerosols greatly increases the agreement with observed trends in these areas, which cannot be attributed to either greenhouse gases or natural forcings. Estimates of precipitation responses derived from multiplying our Regional Precipitation Potentials (RPP; the response per unit forcing relationships) by historical forcings typically capture the actual response in full transient climate simulations fairly well, suggesting that these relationships may provide useful metrics. The strong sensitivity to aerosol and ozone forcing suggests that although some air quality improvements may unmask greenhouse gas-induced warming, they have large benefits for reducing regional disruption of the hydrologic cycle. JF - Atmospheric Chemistry and Physics AU - Shindell, D T AU - Voulgarakis, A AU - Faluvegi, G AU - Milly, G AD - NASA Goddard Institute for Space Studies and Columbia Earth Institute, New York, USA Y1 - 2012/08/02/ PY - 2012 DA - 2012 Aug 02 SP - 6969 EP - 6982 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 15 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts; Pollution Abstracts KW - Historical account KW - Ecosystems KW - Rainfall KW - Climate change KW - Air quality KW - Ecological Effects KW - Ozone in troposphere KW - Hydrologic Cycle KW - Hydrologic Models KW - Radiative forcing KW - Latitude KW - Asia KW - Ozone KW - Aerosols KW - Atmospheric pollution KW - Biogeochemical cycle KW - Climates KW - Carbon cycle KW - Simulation KW - Greenhouse effect KW - Precipitation KW - Hydrologic cycle KW - Greenhouses KW - Numerical simulations KW - Atmospheric chemistry KW - Global warming KW - Greenhouse gases KW - Carbon dioxide KW - Carbon Dioxide KW - Q2 09243:Structure, mechanics and thermodynamics KW - SW 5040:Data acquisition KW - M2 556:General (556) KW - P 0000:AIR POLLUTION KW - AQ 00005:Underground Services and Water Use UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069201749?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=Precipitation+response+to+regional+radiative+forcing&rft.au=Shindell%2C+D+T%3BVoulgarakis%2C+A%3BFaluvegi%2C+G%3BMilly%2C+G&rft.aulast=Shindell&rft.aufirst=D&rft.date=2012-08-02&rft.volume=12&rft.issue=15&rft.spage=6969&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Last updated - 2016-07-07 N1 - SubjectsTermNotLitGenreText - Aerosols; Biogeochemical cycle; Atmospheric chemistry; Climate change; Carbon cycle; Greenhouse effect; Carbon dioxide; Hydrologic cycle; Ozone; Ozone in troposphere; Atmospheric pollution; Radiative forcing; Ecosystems; Numerical simulations; Global warming; Precipitation; Greenhouse gases; Historical account; Rainfall; Latitude; Simulation; Air quality; Hydrologic Cycle; Hydrologic Models; Climates; Ecological Effects; Greenhouses; Carbon Dioxide; Asia ER - TY - JOUR T1 - Celestial reference frames at multiple radio wavelengths AN - 1664212415; PQ0001237340 AB - In 1997 the IAU adopted the International Celestial Reference Frame (ICRF) built from S/X VLBI data. In response to IAU resolutions encouraging the extension of the ICRF to additional frequency bands, VLBI frames have been made at 24, 32, and 43 GHz. Meanwhile, the 8.4 GHz work has been greatly improved with the 2009 release of the ICRF-2. This paper discusses the motivations for extending the ICRF to these higher frequency radio bands. Results to date will be summarized including evidence that the high frequency frames are rapidly approaching the accuracy of the 8.4 GHz ICRF-2. We discuss current limiting errors and prospects for the future accuracy of radio reference frames. We note that comparison of multiple radio frames is characterizing the frequency dependent systematic noise floor from extended source morphology and core shift. Finally, given Gaia's potential for high accuracy optical astrometry, we have simulated the precision of a radio-optical frame tie to be ~10-15 mu as (1-[sigma], per component). JF - Proceedings of the International Astronomical Society AU - Jacobs, C S AU - Montmerle, Thierry AD - Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA, Christopher.S.Jacobs@jpl.nasa.gov Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - 213 EP - 214 PB - Cambridge University Press, The Edinburgh Building, Cambridge CB2 2RU United Kingdom VL - 10 IS - H16 SN - 1743-9213, 1743-9213 KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - Acoustic waves KW - Morphology KW - Noise levels KW - Noise pollution KW - P 7000:NOISE KW - M2 523.92:Solar Interior (523.92) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1664212415?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Proceedings+of+the+International+Astronomical+Society&rft.atitle=Celestial+reference+frames+at+multiple+radio+wavelengths&rft.au=Jacobs%2C+C+S%3BMontmerle%2C+Thierry&rft.aulast=Jacobs&rft.aufirst=C&rft.date=2012-08-01&rft.volume=10&rft.issue=H16&rft.spage=213&rft.isbn=&rft.btitle=&rft.title=Proceedings+of+the+International+Astronomical+Society&rft.issn=17439213&rft_id=info:doi/10.1017%2FS1743921314005468 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-03-01 N1 - Last updated - 2015-11-16 N1 - SubjectsTermNotLitGenreText - Acoustic waves; Noise pollution; Morphology; Noise levels DO - http://dx.doi.org/10.1017/S1743921314005468 ER - TY - JOUR T1 - LIFE, Life Investigation for Enceladus; a sample return mission concept in search for evidence of life AN - 1629942444; 2014-093522 JF - Astrobiology AU - Tsou, Peter AU - Brownlee, Donald E AU - McKay, Christopher P AU - Anbar, Ariel AU - Yano, Hajime AU - Altwegg, Kathrin AU - Beegle, Luther W AU - Dissly, Rich AU - Strange, Nathan J AU - Kanik, Isik Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 730 EP - 742 PB - Mary Ann Liebert, Larchmont, NY VL - 12 IS - 8 SN - 1531-1074, 1531-1074 KW - icy satellites KW - plumes KW - sample return KW - payload KW - astrobiology KW - giant planets KW - Saturn KW - geysers KW - outer planets KW - Life Investigation for Enceladus mission concept KW - satellites KW - water KW - protection KW - in situ KW - Stardust Mission KW - E ring KW - cost KW - concepts KW - measurement KW - planets KW - planetary rings KW - organic compounds KW - Enceladus Satellite KW - instruments KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1629942444?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrobiology&rft.atitle=LIFE%2C+Life+Investigation+for+Enceladus%3B+a+sample+return+mission+concept+in+search+for+evidence+of+life&rft.au=Tsou%2C+Peter%3BBrownlee%2C+Donald+E%3BMcKay%2C+Christopher+P%3BAnbar%2C+Ariel%3BYano%2C+Hajime%3BAltwegg%2C+Kathrin%3BBeegle%2C+Luther+W%3BDissly%2C+Rich%3BStrange%2C+Nathan+J%3BKanik%2C+Isik&rft.aulast=Tsou&rft.aufirst=Peter&rft.date=2012-08-01&rft.volume=12&rft.issue=8&rft.spage=730&rft.isbn=&rft.btitle=&rft.title=Astrobiology&rft.issn=15311074&rft_id=info:doi/10.1089%2Fast.2011.0813 L2 - http://www.liebertpub.com/publication.aspx?pub_id=99 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. N1 - Date revised - 2014-01-01 N1 - Number of references - 60 N1 - PubXState - NY N1 - Document feature - illus. incl. 3 tables N1 - Last updated - 2014-12-04 N1 - SubjectsTermNotLitGenreText - astrobiology; concepts; cost; E ring; Enceladus Satellite; geysers; giant planets; icy satellites; in situ; instruments; Life Investigation for Enceladus mission concept; measurement; organic compounds; outer planets; payload; planetary rings; planets; plumes; protection; sample return; satellites; Saturn; Stardust Mission; water DO - http://dx.doi.org/10.1089/ast.2011.0813 ER - TY - JOUR T1 - Exploring the influence of impervious surface density and shape on urban heat islands in the northeast United States using MODIS and Landsat AN - 1315621054; 17705695 AB - Impervious surface area (ISA) from the National Land Cover Database 2001 and land surface skin temperature from MODIS averaged over three annual cycles (2003-2005) are used in a spatial analysis to assess the surface urban heat island (UHI) signature and its relationship to settlement size and shape, development intensity distribution, and land cover composition for 42 urban settlements embedded in forest biomes in the northeastern United States. Development intensity zones, based on percent ISA, are defined for each urban area emanating outward from the urban core to nearby rural areas and are used to stratify land surface temperature. The stratification is further constrained by biome type and elevaton to ensure objective intercompansons between urban zones within an urban settlement and between settlements. Stratification based on ISA allows the definition of hierarchically ordered urban zones that are consistent across urban settlements and scales. For cities within the northeastern US temperate mixed forest biome, we found that settlement size, shape, and development intensity significantly influenced the amplitude of summer daytime UHI. Our study indicates that for cities of similar size, the ISA density distribution within the urban area and the shape of the urbanized area as measured by area to perimeter ratio are significant modulators of UHI magnitude. Our results indicate that remotely sensed satellite data provide a consistent characterization of the UHI magnitude as well as its major drivers across regional scales. JF - Canadian Journal of Remote Sensing/Journal Canadien de Teledetection AU - Zhang, P AU - Imhoff, M L AU - Bounoua, L AU - Wolfe, R E AD - Hydrosphere and Biosphenc Science Laboratory, NASA's Goddard Space Flight Center, Greenbelt, MD 20771, USA, Ping.zhang-1@nasa.gov Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - 441 EP - 451 PB - Canadian Aeronautics and Space Institute, 1685 Russell Rd, Unit 1R Ottawa ON K1G 0N1 Canada VL - 38 IS - 4 SN - 0703-8992, 0703-8992 KW - Aqualine Abstracts; Water Resources Abstracts; Meteorological & Geoastrophysical Abstracts; Sustainability Science Abstracts KW - Remote Sensing KW - Surface temperatures KW - Human settlements KW - Remote sensing KW - Forests KW - LANDSAT KW - Stratification KW - Mixed Forests KW - Cities KW - MODIS (Moderate Resolution Imaging Spectrometer) KW - Urban areas KW - Satellite Technology KW - Skin KW - Density KW - Temperature KW - Urban heat islands KW - Shape KW - USA KW - Satellite data KW - Heat KW - Urban Areas KW - Rural areas KW - AQ 00006:Sewage KW - SW 5040:Data acquisition KW - M3 1010:Issues in Sustainable Development KW - M2 551.588:Environmental Influences (551.588) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1315621054?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Canadian+Journal+of+Remote+Sensing%2FJournal+Canadien+de+Teledetection&rft.atitle=Exploring+the+influence+of+impervious+surface+density+and+shape+on+urban+heat+islands+in+the+northeast+United+States+using+MODIS+and+Landsat&rft.au=Zhang%2C+P%3BImhoff%2C+M+L%3BBounoua%2C+L%3BWolfe%2C+R+E&rft.aulast=Zhang&rft.aufirst=P&rft.date=2012-08-01&rft.volume=38&rft.issue=4&rft.spage=441&rft.isbn=&rft.btitle=&rft.title=Canadian+Journal+of+Remote+Sensing%2FJournal+Canadien+de+Teledetection&rft.issn=07038992&rft_id=info:doi/10.5589%2Fm12-036 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-03-01 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Surface temperatures; Satellite data; Remote sensing; LANDSAT; MODIS (Moderate Resolution Imaging Spectrometer); Urban heat islands; Rural areas; Cities; Skin; Human settlements; Temperature; Forests; Stratification; Urban areas; Remote Sensing; Satellite Technology; Shape; Heat; Urban Areas; Density; Mixed Forests; USA DO - http://dx.doi.org/10.5589/m12-036 ER - TY - JOUR T1 - The influence of authigenic clay formation on the mineralogy and stable isotopic record of lacustrine carbonates AN - 1282823825; 2013-013326 AB - The mineralogical, compositional and stable isotopic variability of lacustrine carbonates are frequently used as proxies for ancient paleoenvironmental change in continental settings, under the assumption that precipitated carbonates reflect conditions and chemistry of ancient lake waters. In some saline and alkaline lake systems, however, authigenic clay minerals, forming at or near the sediment water interface, are a major sedimentary component. Often these clays are rich in Mg, influencing the geochemical budget of lake waters, and are therefore expected to influence the properties of contemporaneous authigenic carbonate precipitates (which may also contain Mg). This paper documents evidence for a systematic feedback between clay mineral and carbonate authigenesis through multiple precessionally driven, m-scale sedimentary cycles in lacustrine oil-shale deposits of the Eocene Green River Formation from the Uinta Basin (NE Utah). In the studied section, authigenic, Mg-rich, trioctahedral smectite content varies cyclically between 9 and 39 wt.%. The highest concentrations occur in oil-shales and calcareous mudstones deposited during high lake level intervals that favored sedimentary condensation, lengthening the time available for clay diagenesis and reducing dilution by other siliciclastic phases. An inverse relation between dolomite percentage of carbonate and trioctahedral smectite abundance suggests the Mg uptake during clay authigenesis provides a first order control on carbonate mineralogy that better explains carbonate mineralogical trends than the possible alternative controls of (1) variable Mg/Ca ratios in lake water and (2) degree of microbial activity in sediments. We also observe that cyclical change in carbonate mineralogy, believed to be induced by clay authigenesis, also causes isotopic covariation between delta (super 13) C (sub PDB) and delta (super 18) O (sub PDB) of bulk sediments because of differences in the equilibrium fractionation factors of dolomite and calcite ( approximately 2 ppm and approximately 2.6%, respectively). This provides an alternative mechanism for the common pattern of isotopic covariation, which is typically attributed to the effect of simultaneous changes in water balance and biological activity on the carbon and oxygen isotopic composition of lake waters. These findings may help improve paleoenvironmental reconstructions based on lacustrine carbonate records by adding to the factors known to influence the mineralogical, compositional and stable isotopic signals recorded by lacustrine carbonates. Abstract Copyright (2012) Elsevier, B.V. JF - Geochimica et Cosmochimica Acta AU - Bristow, Thomas F AU - Kennedy, Martin J AU - Morrison, Keith D AU - Mrofka, David D Y1 - 2012/08/01/ PY - 2012 DA - 2012 Aug 01 SP - 64 EP - 82 PB - Elsevier, New York, NY VL - 90 SN - 0016-7037, 0016-7037 KW - United States KW - silicates KW - clay KW - lithostratigraphy KW - Uinta Basin KW - oxygen KW - X-ray diffraction data KW - isotopes KW - Green River basin KW - authigenic minerals KW - Piceance Creek basin KW - stable isotopes KW - Cenozoic KW - mineral composition KW - carbon KW - sediments KW - chemical composition KW - carbonate sediments KW - Eocene KW - clastic sediments KW - isotope ratios KW - C-13/C-12 KW - Paleogene KW - O-18/O-16 KW - southwestern Wyoming KW - clay minerals KW - calcite KW - Wyoming KW - Tertiary KW - Parachute Creek Member KW - sedimentary petrology KW - lacustrine environment KW - Green River Formation KW - sheet silicates KW - Utah KW - crystal chemistry KW - Colorado KW - northwestern Colorado KW - carbonates KW - northeastern Utah KW - lake sediments KW - 06A:Sedimentary petrology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1282823825?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Geochimica+et+Cosmochimica+Acta&rft.atitle=The+influence+of+authigenic+clay+formation+on+the+mineralogy+and+stable+isotopic+record+of+lacustrine+carbonates&rft.au=Bristow%2C+Thomas+F%3BKennedy%2C+Martin+J%3BMorrison%2C+Keith+D%3BMrofka%2C+David+D&rft.aulast=Bristow&rft.aufirst=Thomas&rft.date=2012-08-01&rft.volume=90&rft.issue=&rft.spage=64&rft.isbn=&rft.btitle=&rft.title=Geochimica+et+Cosmochimica+Acta&rft.issn=00167037&rft_id=info:doi/10.1016%2Fj.gca.2012.05.006 L2 - http://www.sciencedirect.com/science/journal/00167037 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands N1 - Date revised - 2013-01-01 N1 - Number of references - 75 N1 - PubXState - NY N1 - Document feature - illus. incl. sketch map N1 - SuppNotes - Includes appendices N1 - Last updated - 2013-02-05 N1 - CODEN - GCACAK N1 - SubjectsTermNotLitGenreText - authigenic minerals; C-13/C-12; calcite; carbon; carbonate sediments; carbonates; Cenozoic; chemical composition; clastic sediments; clay; clay minerals; Colorado; crystal chemistry; Eocene; Green River basin; Green River Formation; isotope ratios; isotopes; lacustrine environment; lake sediments; lithostratigraphy; mineral composition; northeastern Utah; northwestern Colorado; O-18/O-16; oxygen; Paleogene; Parachute Creek Member; Piceance Creek basin; sedimentary petrology; sediments; sheet silicates; silicates; southwestern Wyoming; stable isotopes; Tertiary; Uinta Basin; United States; Utah; Wyoming; X-ray diffraction data DO - http://dx.doi.org/10.1016/j.gca.2012.05.006 ER - TY - JOUR T1 - Aqueous extracts of a Mars analogue regolith that mimics the Phoenix landing site do not inhibit spore germination or growth of model spacecraft contaminations Bacillus subtilis 168 and Bacillus pumilus SAFR-032 AN - 1220565864; 2013-002140 AB - Because Mars is a primary target for life detection and habitability assessment missions, its exploration is also by necessity a Planetary Protection issue. The recent finding of significant levels of perchlorate (ClO (super -) (sub 4) ) in regolith sampled from the Phoenix landing site raises the question of its potential biotoxicity to putative indigenous martian life, microbial forward contaminants from Earth, or future human visitors. To address this issue, an analogue regolith was constructed based on regolith chemistry data from the Phoenix landing site. A Mars Aqueous Regolith Extract (MARE) was prepared from the Phoenix analogue regolith and analyzed by ion chromatography. The MARE contained (mg/L) the cations Na (super +) (1411 + or - 181), Mg (super 2+) (1051 + or - 160), Ca (super 2+) (832 + or - 125), and K (super +) (261 + or - 29), and the anions SO (super 2-) (sub 4) , (5911 + or - 993), ClO (super -) (sub 4) (5316 + or - 1767), Cl (super -) (171 + or - 52) and F (super -) (2.0 + or - 0.4). Nitrogen-containing species NO (super -) (sub 3) (773 + or - 113) and were also present as a result of regolith preparation procedures, but their relevance to Mars is at present unknown. The MARE was tested for potential toxic effects on two model spacecraft contaminants, the spore-forming bacteria Bacillus subtilis strain 168 and Bacillus pumilus strain SAFR-032. In B. subtilis, spore germination and initial vegetative growth (up to approximately 5 h) was not inhibited in a rich complex medium prepared with the MARE, but growth after 5 h was significantly suppressed in medium prepared using the MARE. Both B. subtilis and B. pumilus exhibited significantly higher rates of spore germination and growth in the MARE vs. DW with no additions (likely due to endogenous spore nutrients), but germination and growth was further stimulated by addition of glucose and a combination of buffered inorganic salts (K (sub 2) HPO (sub 4) , KH (sub 2) PO (sub 4) ,(NH (sub 4) ) (sub 2) SO (sub 4) , and MgSO (sub 4) ). The data indicate that the aqueous environment in the regolith from the Phoenix landing site containing high levels of perchlorate does not pose a significant barrier to growth of putative forward contaminants such as B. subtilis and B. pumilus under Earth laboratory conditions. JF - Icarus AU - Nicholson, Wayne L AU - McCoy, Lashelle E AU - Kerney, Krystal R AU - Ming, Douglas W AU - Golden, D C AU - Schuerger, Andrew C Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 904 EP - 910 PB - Elsevier, New York, NY VL - 220 IS - 2 SN - 0019-1035, 0019-1035 KW - experimental studies KW - Mars Phoenix Lander KW - Bacillus subtilis KW - astrobiology KW - Mars KW - aqueous solutions KW - perchlorate KW - terrestrial planets KW - models KW - spores KW - planets KW - toxicity KW - spacecraft KW - bacteria KW - leachate KW - contaminants KW - Bacillus KW - regolith KW - Mars analogs KW - microorganisms KW - growth KW - Bacillus pumilus KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220565864?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Aqueous+extracts+of+a+Mars+analogue+regolith+that+mimics+the+Phoenix+landing+site+do+not+inhibit+spore+germination+or+growth+of+model+spacecraft+contaminations+Bacillus+subtilis+168+and+Bacillus+pumilus+SAFR-032&rft.au=Nicholson%2C+Wayne+L%3BMcCoy%2C+Lashelle+E%3BKerney%2C+Krystal+R%3BMing%2C+Douglas+W%3BGolden%2C+D+C%3BSchuerger%2C+Andrew+C&rft.aulast=Nicholson&rft.aufirst=Wayne&rft.date=2012-08-01&rft.volume=220&rft.issue=2&rft.spage=904&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.06.033 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 58 N1 - PubXState - NY N1 - Document feature - illus. N1 - Last updated - 2012-11-29 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - aqueous solutions; astrobiology; Bacillus; Bacillus pumilus; Bacillus subtilis; bacteria; contaminants; experimental studies; growth; leachate; Mars; Mars analogs; Mars Phoenix Lander; microorganisms; models; perchlorate; planets; regolith; spacecraft; spores; terrestrial planets; toxicity DO - http://dx.doi.org/10.1016/j.icarus.2012.06.033 ER - TY - JOUR T1 - Forward and inverse modeling for Jovian seismology AN - 1220565856; 2013-002139 AB - Jupiter is expected to pulsate in a spectrum of acoustic modes and recent re-analysis of a spectroscopic time series has identified a regular pattern in the spacing of the frequencies (Gaulme, P., Schmider, F. X., Gay, J., Guillot, T., Jacob, C. [2011]. Astron. Astrophys. 531, A104). This exciting result can provide constraints on gross jovian properties and warrants a more in-depth theoretical study of the seismic structure of Jupiter. With current instrumentation, such as the SYMPA instrument (Schmider, F. X. [2007]. Astron. Astrophys. 474, 1073-1080) used for the Gaulme et al. (Gaulme, P., Schmider, F. X., Gay, J., Guillot, T., Jacob, C. [2011]. Astron. Astrophys. 531, A104) analysis, we assume that, at minimum, a set of global frequencies extending up to angular degree l=25 could be observed. In order to identify which modes would best constraining models of Jupiter's interior and thus help motivate the next generation of observations, we explore the sensitivity of derived parameters to this mode set. Three different models of the jovian interior are computed and the theoretical pulsation spectrum from these models for l=25 is obtained. We compute sensitivity kernels and perform linear inversions to infer details of the expected discontinuities in the profiles in the jovian interior. We find that the amplitude of the sound-speed jump of a few percent in the inner/outer envelope boundary seen in two of the applied models should be reasonably inferred with these particular modes. Near the core boundary where models predict large density discontinuities, the location of such features can be accurately measured, while their amplitudes have more uncertainty. These results suggest that this mode set would be sufficient to infer the radial location and strength of expected discontinuities in Jupiter's interior, and place strong constraints on the core size and mass. We encourage new observations to detect these jovian oscillations. JF - Icarus AU - Jackiewicz, Jason AU - Nettelmann, Nadine AU - Marley, Mark AU - Fortney, Jonathan Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 844 EP - 854 PB - Elsevier, New York, NY VL - 220 IS - 2 SN - 0019-1035, 0019-1035 KW - seismology KW - time series analysis KW - statistical analysis KW - Jupiter KW - inverse problem KW - direct problem KW - frequency KW - giant planets KW - spherical harmonic analysis KW - models KW - mass KW - planets KW - discontinuities KW - oscillations KW - planetary interiors KW - core KW - outer planets KW - acoustical waves KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220565856?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Forward+and+inverse+modeling+for+Jovian+seismology&rft.au=Jackiewicz%2C+Jason%3BNettelmann%2C+Nadine%3BMarley%2C+Mark%3BFortney%2C+Jonathan&rft.aulast=Jackiewicz&rft.aufirst=Jason&rft.date=2012-08-01&rft.volume=220&rft.issue=2&rft.spage=844&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.06.028 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 37 N1 - PubXState - NY N1 - Document feature - illus. N1 - Last updated - 2012-11-29 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - acoustical waves; core; direct problem; discontinuities; frequency; giant planets; inverse problem; Jupiter; mass; models; oscillations; outer planets; planetary interiors; planets; seismology; spherical harmonic analysis; statistical analysis; time series analysis DO - http://dx.doi.org/10.1016/j.icarus.2012.06.028 ER - TY - JOUR T1 - Spectral reflectance properties of carbonaceous chondrites 4; aqueously altered and thermally metamorphosed meteorites AN - 1220565820; 2013-002134 AB - We examined the spectral reflectance properties of 26 carbonaceous chondrites (CCs) that show evidence of aqueous alteration and subsequent thermal metamorphism (termed ATCCs). We also reviewed the thermal and aqueous alteration history of these meteorites and searched for trends between spectral parameters and temperature histories in order to uncover spectral-compositional relationships. Aqueous alteration results in the production of phyllosilicates from anhydrous silicate precursors - largely serpentine group phyllosilicates, and increasing amounts of saponite group phyllosilicates with increasing aqueous alteration. Thermal metamorphism results in dehydration of these phyllosilicates and production of abundant amorphous material except at the highest temperatures ( approximately 900 degrees C), as well as alteration of carbonaceous components. ATCCs are a spectrally diverse group in almost all respects. Spectral slopes, as measured by the ratio of reflectance at 2.4 mu m to the local peak or inflection in the 0.5-0.8 mu m region and 2.4/1.5 mu m ratios range from 0.78 to 1.48, and 0.93 to 1.24, respectively (blue-sloped spectra have ratio values of <1). ATCC powder spectra (<75, <100, or <125 mu m) are generally dark, with maximum reflectance at the local peak or inflection in the 0.5-0.8 mu m region, or maximum reflectance at any wavelength ranging from 2.6% to 8.9%, and 3.5% to 10.3%, respectively. All ATCC spectra exhibit an absorption feature in the approximately 0.8-1.3 mu m region, with band depths ranging from approximately 1% to 8%. This feature is diverse in terms of number of apparent absorption bands. The presence of mixed valence Fe (super 2+) -Fe (super 3+) phyllosilicates, as evidenced by an absorption band near 0.7 mu m with a depth of up to 5%, and Mg-bearing phyllosilicates, as evidenced by an MgOH combination band in the 2.3-2.4 mu m region, are seen in many of the least thermally metamorphosed ATCC spectra. The depth of the 0.7 mu m band generally decreases with increasing temperature. Olivine-associated absorption bands in the 0.8-1.3 mu m region seem to be more prevalent in the more metamorphosed ATCC spectra. However clearly-resolvable olivine absorption bands are not present in ATCC spectra, suggesting that thermal metamorphism did not lead to the production of widespread crystalline Fe (super 2+) -bearing olivine. The reddest ATCC powder spectra are generally the darkest, and C content is correlated with decreasing overall reflectance and weakly correlated with spectral slope. When the degree of thermal metamorphism was compared to various spectral measures of slope, band depth, and overall reflectance, no strong correlations emerged. However, it does appear that the most thermally metamorphosed ATCCs have generally flatter spectral slopes. ATCC chip spectra are brighter and less red-sloped than powder spectra, but band depths are generally comparable. Laboratory-heated CIs and CMs generally exhibit the same types of spectral changes seen in naturally thermally metamorphosed ATCCs. For laboratory-heated CM and CI chondrites, and ATCCs for which temperature estimates are available, reflectance generally decreases with increasing temperature to approximately 500 degrees C, and then increases to higher temperatures. Silicate absorption band depths are generally least for temperatures of approximately 600-800 degrees C. Below this temperature interval, ATCC spectra show more phyllosilicate-like absorption bands. ATCC spectra generally become flatter with increasing temperature above approximately 400 degrees C. Temperatures in excess of those experienced by the ATCCs ( approximately 900 degrees C) are required for the appearance of well-resolved olivine absorption bands. JF - Icarus AU - Cloutis, E A AU - Hudon, P AU - Hiroi, T AU - Gaffey, M J Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 586 EP - 617 PB - Elsevier, New York, NY VL - 220 IS - 2 SN - 0019-1035, 0019-1035 KW - silicates KW - serpentine KW - terrestrial environment KW - stony meteorites KW - olivine group KW - iron KW - temperature KW - meteorites KW - ferric iron KW - absorption KW - serpentine group KW - olivine KW - orthosilicates KW - spectra KW - chondrites KW - CI chondrites KW - saponite KW - grain size KW - thermal metamorphism KW - carbonaceous chondrites KW - metamorphism KW - weathering KW - ferrous iron KW - clay minerals KW - nesosilicates KW - aqueous alteration KW - metals KW - sheet silicates KW - dehydration KW - CM chondrites KW - reflectance KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220565820?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Spectral+reflectance+properties+of+carbonaceous+chondrites+4%3B+aqueously+altered+and+thermally+metamorphosed+meteorites&rft.au=Cloutis%2C+E+A%3BHudon%2C+P%3BHiroi%2C+T%3BGaffey%2C+M+J&rft.aulast=Cloutis&rft.aufirst=E&rft.date=2012-08-01&rft.volume=220&rft.issue=2&rft.spage=586&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.05.018 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 108 N1 - PubXState - NY N1 - Document feature - illus. incl. 5 tables N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-11-29 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - absorption; aqueous alteration; carbonaceous chondrites; chondrites; CI chondrites; clay minerals; CM chondrites; dehydration; ferric iron; ferrous iron; grain size; iron; metals; metamorphism; meteorites; nesosilicates; olivine; olivine group; orthosilicates; reflectance; saponite; serpentine; serpentine group; sheet silicates; silicates; spectra; stony meteorites; temperature; terrestrial environment; thermal metamorphism; weathering DO - http://dx.doi.org/10.1016/j.icarus.2012.05.018 ER - TY - JOUR T1 - Spectral reflectance properties of carbonaceous chondrites; 5, CO chondrites AN - 1220564650; 2013-002132 AB - We examined the spectral reflectance properties of 16 CO-type carbonaceous chondrites (CCs) in order to better understand their range of spectral properties, develop spectral-compositional correlations, and provide information that may aid in the search for CO parent bodies. As a group, our CO powder spectra have some similarities and differences. COs have experienced varying degree of thermal metamorphism, with petrologic subgrades ranging from approximately CO3.0 to approximately CO3.8. Their reflectance spectra are characterized by a ubiquitous absorption feature in the 1 ?m region, and a nearly ubiquitous feature in the 2 mu m region that appears in CO >3.1 spectra. The 1 mu m region feature is attributable to abundant Fe-bearing amorphous phases (and Fe-poor olivine) in the lower petrologic subtypes, which gradually transforms to more abundant and Fe-rich olivine with increasing metamorphism. The increase in depth and decrease in wavelength position of this feature are consistent with this transformation. All but the least-altered COs also exhibit an absorption feature in the 2 mu m region whose depth also generally increases with increasing metamorphic grade, resulting in increasingly blue-sloped spectra and larger band area ratios. The wavelength position and change in depth of this feature (ranging from 0% to 12.2%) is consistent with increasing Fe (super 2+) in spinel, which is present in calcium-aluminum and ameboid olivine inclusions. Reflectance of a local reflectance maximum near 0.8 mu m increases with increasing thermal metamorphism and this is likely due to the loss and aggregation of carbonaceous phases. The increasing reflectance is negatively correlated with various measures of spectral slope (i.e., brighter = bluer), and while this cannot be uniquely attributed to any one cause, it is consistent with increasing spinel Fe (super 2+) content and decreasing carbonaceous material abundance or aggregation. With decreasing grain size, CO spectra normally become brighter and more red-sloped. The 0.6/0.5 mu m ratios of CO falls are consistently higher than CO finds, suggesting that terrestrial weathering has affected the visible wavelength region spectral properties of finds. Unmetamorphosed CO spectra may be difficult to distinguish from the least altered CM chondrites. However above petrologic grade approximately 3.1, COs can be uniquely discriminated from CI, CM, metamorphosed CI and CM, and CR chondrites, by the presence of both olivine and spinel absorption bands. Some K-class asteroids exhibit olivine and spinel absorption bands, consistent with CO chondrites, although modeled olivine:spinel ratios are generally lower in these asteroids than in CO chondrites. JF - Icarus AU - Cloutis, E A AU - Hudon, P AU - Hiroi, T AU - Gaffey, M J AU - Mann, P Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 466 EP - 486 PB - Elsevier, New York, NY VL - 220 IS - 2 SN - 0019-1035, 0019-1035 KW - silicates KW - terrestrial environment KW - stony meteorites KW - olivine group KW - iron KW - CO chondrites KW - meteorites KW - absorption KW - olivine KW - orthosilicates KW - oxides KW - grade KW - spectra KW - chondrites KW - amorphous materials KW - parent bodies KW - grain size KW - spinel KW - carbonaceous chondrites KW - metamorphism KW - weathering KW - meteorite falls KW - nesosilicates KW - metals KW - transformations KW - reflectance KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220564650?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Spectral+reflectance+properties+of+carbonaceous+chondrites%3B+5%2C+CO+chondrites&rft.au=Cloutis%2C+E+A%3BHudon%2C+P%3BHiroi%2C+T%3BGaffey%2C+M+J%3BMann%2C+P&rft.aulast=Cloutis&rft.aufirst=E&rft.date=2012-08-01&rft.volume=220&rft.issue=2&rft.spage=466&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.05.019 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 119 N1 - PubXState - NY N1 - Document feature - illus. incl. 3 tables N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-11-29 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - absorption; amorphous materials; carbonaceous chondrites; chondrites; CO chondrites; grade; grain size; iron; metals; metamorphism; meteorite falls; meteorites; nesosilicates; olivine; olivine group; orthosilicates; oxides; parent bodies; reflectance; silicates; spectra; spinel; stony meteorites; terrestrial environment; transformations; weathering DO - http://dx.doi.org/10.1016/j.icarus.2012.05.019 ER - TY - JOUR T1 - Widespread crater-related pitted materials on Mars; further evidence for the role of target volatiles during the impact process AN - 1220564631; 2013-002129 AB - Recently acquired high-resolution images of martian impact craters provide further evidence for the interaction between subsurface volatiles and the impact cratering process. A densely pitted crater-related unit has been identified in images of 204 craters from the Mars Reconnaissance Orbiter. This sample of craters are nearly equally distributed between the two hemispheres, spanning from 53 degrees S to 62 degrees N latitude. They range in diameter from approximately 1 to 150 km, and are found at elevations between -5.5 to +5.2 km relative to the martian datum. The pits are polygonal to quasi-circular depressions that often occur in dense clusters and range in size from ?10 m to as large as 3 km. Pit sizes scale with both the host crater's diameter and the host deposit size. These pits have subtle raised rims, and unlike primary and secondary impact craters, they lack well-defined ejecta deposits and overlapping stratigraphic relationships. They also lack any sign of any preferential alignment expected of volcanic or tectonic collapse features. Morphologic and stratigraphic evidence in support of an impact origin includes the observation that pitted materials primarily occur as ponded and flow-like deposits on crater floors, behind terraces, and infilling the lowest local topographic depressions atop the ejecta blanket-similar to the distribution of impact melt-bearing bodies on the Moon. Based on the observations and comparisons to terrestrial and lunar analogs, we conclude that the pit-bearing materials are impactite deposits. The presence of these deposits in older craters, where preserved, suggests that they have formed on Mars throughout most of its geologic history; thus, understanding their origin may help to constrain the hydrological and climate history of Mars. JF - Icarus AU - Tornabene, Livio L AU - Osinski, Gordon R AU - McEwen, Alfred S AU - Boyce, Joseph M AU - Bray, Veronica J AU - Caudill, Christy M AU - Grant, John A AU - Hamilton, Christopher W AU - Mattson, Sarah AU - Mouginis-Mark, Peter J Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 348 EP - 368 PB - Elsevier, New York, NY VL - 220 IS - 2 SN - 0019-1035, 0019-1035 KW - cratering KW - imagery KW - impact features KW - Mars KW - digital terrain models KW - Context Camera KW - topography KW - Amazonian KW - metamorphic rocks KW - HiRISE KW - impactites KW - pits KW - elevation KW - Mars Reconnaissance Orbiter KW - impacts KW - ejecta KW - distribution KW - overprinting KW - size KW - High Resolution Imaging Science Experiment KW - terrestrial planets KW - morphology KW - planets KW - volatiles KW - depressions KW - MOLA KW - impact craters KW - latitude KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1220564631?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Widespread+crater-related+pitted+materials+on+Mars%3B+further+evidence+for+the+role+of+target+volatiles+during+the+impact+process&rft.au=Tornabene%2C+Livio+L%3BOsinski%2C+Gordon+R%3BMcEwen%2C+Alfred+S%3BBoyce%2C+Joseph+M%3BBray%2C+Veronica+J%3BCaudill%2C+Christy+M%3BGrant%2C+John+A%3BHamilton%2C+Christopher+W%3BMattson%2C+Sarah%3BMouginis-Mark%2C+Peter+J&rft.aulast=Tornabene&rft.aufirst=Livio&rft.date=2012-08-01&rft.volume=220&rft.issue=2&rft.spage=348&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.05.022 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2013, American Geosciences Institute. N1 - Date revised - 2013-01-01 N1 - Number of references - 104 N1 - PubXState - NY N1 - Document feature - illus. incl. 4 tables, sketch map N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-11-29 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - Amazonian; Context Camera; cratering; depressions; digital terrain models; distribution; ejecta; elevation; High Resolution Imaging Science Experiment; HiRISE; imagery; impact craters; impact features; impactites; impacts; latitude; Mars; Mars Reconnaissance Orbiter; metamorphic rocks; MOLA; morphology; overprinting; pits; planets; size; terrestrial planets; topography; volatiles DO - http://dx.doi.org/10.1016/j.icarus.2012.05.022 ER - TY - JOUR T1 - On the problems of total specific surface area and cation exchange capacity measurements in organic-rich sedimentary rocks AN - 1151912924; 2012-101408 AB - The increasing exploration and exploitation of hydrocarbon resources hosted by oil and gas shales demands the correct measurement of certain properties of sedimentary rocks rich in organic matter (OM). Two essential properties of OM-rich shales, the total specific surface area (TSSA) and cation exchange capacity (CEC), are primarily controlled by the rock's clay mineral content (i.e. the type and quantity). This paper presents the limitations of two commonly used methods of measuring bulk-rock TSSA and CEC, ethylene glycol monoethyl ether (EGME) retention and visible light spectrometry of Co(III)-hexamine, in OM-rich rocks. The limitations were investigated using a suite of OM-rich shales and mudstones that vary in origin, age, clay mineral content, and thermal maturity. Ethylene glycol monoethyl ether reacted strongly with and was retained by natural OM, producing excess TSSA if calculated using commonly applied adsorption coefficients. Although the intensity of the reaction seems to depend on thermal maturity, OM in all the samples analyzed reacted with EGME to an extent that made TSSA values unreliable; therefore, EGME is not recommended for TSSA measurements on samples containing >3% OM. Some evidence indicated that drying at > or =200 degrees C may influence bulk-rock CEC values by altering OM in early mature rocks. In light of this evidence, drying at 110 degrees C is recommended as a more suitable pre-treatment for CEC measurements in OM-rich shales. When using visible light spectrometry for CEC determination, leachable sample components contributed to the absorbance of the measured wavelength (470 nm), decreasing the calculated bulk rock CEC value. A test of sample-derived excess absorbance with zero-absorbance solutions (i.e. NaCl) and the introduction of corrections to the CEC calculation are recommended. JF - Clays and Clay Minerals AU - Derkowski, Arkadiusz AU - Bristow, Thomas F Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 348 EP - 362 PB - Clay Minerals Society, Chantilly, VA VL - 60 IS - 4 SN - 0009-8604, 0009-8604 KW - silicates KW - experimental studies KW - cation exchange capacity KW - shale KW - clay mineralogy KW - adsorption KW - measurement KW - clay minerals KW - bitumens KW - organic compounds KW - sedimentary rocks KW - specific surface KW - chemical properties KW - sheet silicates KW - kerogen KW - geochemistry KW - clastic rocks KW - 06A:Sedimentary petrology KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1151912924?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Clays+and+Clay+Minerals&rft.atitle=On+the+problems+of+total+specific+surface+area+and+cation+exchange+capacity+measurements+in+organic-rich+sedimentary+rocks&rft.au=Derkowski%2C+Arkadiusz%3BBristow%2C+Thomas+F&rft.aulast=Derkowski&rft.aufirst=Arkadiusz&rft.date=2012-08-01&rft.volume=60&rft.issue=4&rft.spage=348&rft.isbn=&rft.btitle=&rft.title=Clays+and+Clay+Minerals&rft.issn=00098604&rft_id=info:doi/10.1346%2FCCMN.2012.0600402 L2 - http://www.ingentaconnect.com/content/cms/ccm LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Abstract, Copyright, Clay Minerals Society | Reference includes data from GeoScienceWorld, Alexandria, VA, United States N1 - Date revised - 2012-01-01 N1 - Number of references - 62 N1 - PubXState - VA N1 - Document feature - illus. incl. 3 tables N1 - Last updated - 2012-11-15 N1 - CODEN - CLCMAB N1 - SubjectsTermNotLitGenreText - adsorption; bitumens; cation exchange capacity; chemical properties; clastic rocks; clay mineralogy; clay minerals; experimental studies; geochemistry; kerogen; measurement; organic compounds; sedimentary rocks; shale; sheet silicates; silicates; specific surface DO - http://dx.doi.org/10.1346/CCMN.2012.0600402 ER - TY - JOUR T1 - An analysis of fast photochemistry over high northern latitudes during spring and summer using in-situ observations from ARCTAS and TOPSE AN - 1069202336; 17143952 AB - Observations of chemical constituents and meteorological quantities obtained during the two Arctic phases of the airborne campaign ARCTAS (Arctic Research of the Composition of the Troposphere from Aircraft and Satellites) are analyzed using an observationally constrained steady state box model. Measurements of OH and HO sub(2) from the Penn State ATHOS instrument are compared to model predictions. Forty percent of OH measurements below 2 km are at the limit of detection during the spring phase (ARCTAS-A). While the median observed-to-calculated ratio is near one, both the scatter of observations and the model uncertainty for OH are at the magnitude of ambient values. During the summer phase (ARCTAS-B), model predictions of OH are biased low relative to observations and demonstrate a high sensitivity to the level of uncertainty in NO observations. Predictions of HO sub(2) using observed CH sub(2)O and H sub(2)O sub(2) as model constraints are up to a factor of two larger than observed. A temperature-dependent terminal loss rate of HO sub(2) to aerosol recently proposed in the literature is shown to be insufficient to reconcile these differences. A comparison of ARCTAS-A to the high latitude springtime portion of the 2000 TOPSE campaign (Tropospheric Ozone Production about the Spring Equinox) shows similar meteorological and chemical environments with the exception of peroxides; observations of H sub(2)O sub(2) during ARCTAS-A were 2.5 to 3 times larger than those during TOPSE. The cause of this difference in peroxides remains unresolved and has important implications for the Arctic HO sub(x) budget. Unconstrained model predictions for both phases indicate photochemistry alone is unable to simultaneously sustain observed levels of CH sub(2)O and H sub(2)O sub(2); however when the model is constrained with observed CH sub(2)O, H sub(2)O sub(2) predictions from a range of rainout parameterizations bracket its observations. A mechanism suitable to explain observed concentrations of CH sub(2)O is uncertain. Free tropospheric observations of acetaldehyde (CH sub(3)CHO) are 2-3 times larger than its predictions, though constraint of the model to those observations is sufficient to account for less than half of the deficit in predicted CH sub(2)O. The box model calculates gross O sub(3) formation during spring to maximize from 1-4 km at 0.8 ppbv d super(-1), in agreement with estimates from TOPSE, and a gross production of 2-4 ppbv d super(-1) in the boundary layer and upper troposphere during summer. Use of the lower observed levels of HO sub(2) in place of model predictions decreases the gross production by 25-50%. Net O sub(3) production is near zero throughout the ARCTAS-A troposphere, and is 1-2 ppbv in the boundary layer and upper altitudes during ARCTAS-B. JF - Atmospheric Chemistry and Physics AU - Olson, J R AU - Crawford, J H AU - Brune, W AU - Mao, J AU - Ren, X AU - Fried, A AU - Ander son, B AU - Apel, E AU - Beaver, M AU - Blake, D AD - NASA Langley Research Center, Hampton, VA, USA Y1 - 2012/08/01/ PY - 2012 DA - 2012 Aug 01 SP - 6799 EP - 6825 PB - European Geophysical Society, Max-Planck-Str. 13 Katlenburg-Lindau Germany VL - 12 IS - 15 SN - 1680-7316, 1680-7316 KW - Aqualine Abstracts; Water Resources Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Meteorological & Geoastrophysical Abstracts; Pollution Abstracts KW - Prediction KW - Photochemistry KW - Meteorological data KW - Atmospheric pollution models KW - Boundary Layers KW - Summer KW - Spring KW - Ozone in troposphere KW - Altitude KW - Aircraft KW - Atmospheric chemistry models KW - Latitude KW - Rainout KW - Meteorology KW - Arctic research KW - Arctic KW - Ozone KW - Temperature effects KW - Aerosols KW - Aircraft observations KW - Troposphere KW - Polar environments KW - Model Studies KW - PN, Arctic KW - Boundary layers KW - Atmospheric chemistry KW - SW 5010:Network design KW - AQ 00007:Industrial Effluents KW - M2 551.510.42:Air Pollution (551.510.42) KW - Q2 09188:Atmospheric chemistry KW - P 0000:AIR POLLUTION UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069202336?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Atmospheric+Chemistry+and+Physics&rft.atitle=An+analysis+of+fast+photochemistry+over+high+northern+latitudes+during+spring+and+summer+using+in-situ+observations+from+ARCTAS+and+TOPSE&rft.au=Olson%2C+J+R%3BCrawford%2C+J+H%3BBrune%2C+W%3BMao%2C+J%3BRen%2C+X%3BFried%2C+A%3BAnder+son%2C+B%3BApel%2C+E%3BBeaver%2C+M%3BBlake%2C+D&rft.aulast=Olson&rft.aufirst=J&rft.date=2012-08-01&rft.volume=12&rft.issue=15&rft.spage=6799&rft.isbn=&rft.btitle=&rft.title=Atmospheric+Chemistry+and+Physics&rft.issn=16807316&rft_id=info:doi/ LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Last updated - 2014-05-05 N1 - SubjectsTermNotLitGenreText - Temperature effects; Photochemistry; Aerosols; Boundary layers; Atmospheric chemistry; Troposphere; Spring; Ozone; Ozone in troposphere; Meteorological data; Atmospheric pollution models; Atmospheric chemistry models; Aircraft observations; Rainout; Arctic research; Prediction; Latitude; Meteorology; Summer; Polar environments; Altitude; Aircraft; Boundary Layers; Arctic; Model Studies; PN, Arctic ER - TY - JOUR T1 - Prediction of Crew Health Effects from Air Samples Taken Aboard the International Space Station AN - 1069200636; 17114123 AB - Introduction: Spaceflight aboard the International Space Station (ISS) involves stays of individual crewmembers for up to 6 mo during which they are exposed to a complex mixture of airborne pollutants. Methods to predict specific health effects from exposure to a mixture of air pollutants are not well developed. Herein, air monitoring data from the ISS are used to demonstrate a new method to estimate a threshold for possible health effects from exposure to mixtures. Methods: An empirical, additive approach was developed to transform monthly air pollutant data, which had been obtained primarily by gas chromatography-mass spectrometry from samples of ISS air, to threshold (T) values for 16 adverse health effect groups. Spacecraft maximum allowable concentrations (SMACs), available for most spacecraft air pollutants, were used to form target-organ/effect groups, from which group T values were estimated. If T>1 for a group, then there is an unacceptable risk of the toxic effect. Results: Samples of air taken from the ISS in 2010 revealed that all 1 6 toxicological groups were within safe limits. HighestT values were as follows: mucosal irritants (0.53 plus or minus 0.44), headache (0.52 plus or minus 0.06), central nervous system depression (0.25 plus or minus 0.06), and cardiac sensitization (0.13 plus or minus 0.04). Discussion: The additive model is supported by limited inhalation data on rats in the literature. Our predictions of no adverse effect on crew health are useful as part of NASA's Lifetime Surveillance of Astronaut Health (LSAH). If one of the 16 levels had exceeded T=1, then standard surveillance could be supplemented to address this potential health risk. JF - Aviation, Space, and Environmental Medicine AU - James, J T AU - Zalesak, S M AD - NASA Johnson Space Center, Houston TX, john.t.james@nasa.gov Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - 795 EP - 799 PB - Aerospace Medical Association, 320 S. Henry St. Alexandria VA 22314-3579 United States VL - 83 IS - 8 SN - 0095-6562, 0095-6562 KW - Pollution Abstracts; Health & Safety Science Abstracts KW - Air pollution KW - Prediction KW - Central nervous system KW - Pollution monitoring KW - Air sampling KW - Toxicity KW - Spacecraft KW - Side effects KW - Spectrometry KW - P 0000:AIR POLLUTION KW - H 2000:Transportation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069200636?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.atitle=Prediction+of+Crew+Health+Effects+from+Air+Samples+Taken+Aboard+the+International+Space+Station&rft.au=James%2C+J+T%3BZalesak%2C+S+M&rft.aulast=James&rft.aufirst=J&rft.date=2012-08-01&rft.volume=83&rft.issue=8&rft.spage=795&rft.isbn=&rft.btitle=&rft.title=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.issn=00956562&rft_id=info:doi/10.3357%2FASEM.3237.2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Number of references - 11 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Prediction; Air pollution; Pollution monitoring; Central nervous system; Air sampling; Toxicity; Spacecraft; Side effects; Spectrometry DO - http://dx.doi.org/10.3357/ASEM.3237.2012 ER - TY - JOUR T1 - Evaluation of Global Flood Detection Using Satellite-Based Rainfall and a Hydrologic Model AN - 1069200256; 17111880 AB - A new version of a real-time global flood monitoring system (GFMS) driven by Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) rainfall has been developed and implemented using a physically based hydrologic model. The purpose of this paper is to evaluate the performance of this new version of the GFMS in terms of flood event detection against flood event archives to establish a baseline of performance and directions for improvement. This new GFMS is quantitatively evaluated in terms of flood event detection during the TRMM era (1998-2010) using a global retrospective simulation (3-hourly and 1/8 degree spatial resolution) with the TMPA 3B42V6 rainfall. Four methods were explored to define flood thresholds from the model results, including three percentile-based statistical methods and a Log Pearson type-III flood frequency curve method. The evaluation showed the GFMS detection performance improves [increasing probability of detection (POD)] with longer flood durations and larger affected areas. The impact of dams was detected in the validation statistics, with the presence of dams tending to result in more false alarms and greater false-alarm duration. The GFMS validation statistics for flood durations >3 days and for areas without dams vary across the four methods, but center around a POD of ~0.70 and a false-alarm rate (FAR) of ~0.65. The generally positive results indicate the value of this approach for monitoring and researching floods on a global scale, but also indicate limitations and directions for improvement of such approaches. These directions include improving the rainfall estimates, utilizing higher resolution in the runoff-routing model, taking into account the presence of dams, and improving the method for flood identification. JF - Journal of Hydrometeorology AU - Wu, Huan AU - Adler, Robert F AU - Hong, Yang AU - Tian, Yudong AU - Policelli, Fritz AD - Earth System Science Interdisciplinary Center, University of Maryland, College Park, College Park, and NASA Goddard Space Flight Center, Greenbelt, Maryland Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - 1268 EP - 1284 PB - American Meteorological Society, 45 Beacon St. Boston MA 02108-3693 United States VL - 13 IS - 4 SN - 1525-755X, 1525-755X KW - Meteorological & Geoastrophysical Abstracts; Aqualine Abstracts; ASFA 2: Ocean Technology Policy & Non-Living Resources; Water Resources Abstracts KW - Statistics KW - Rainfall KW - Statistical analysis KW - Freshwater KW - Evaluation KW - Frequency analysis KW - Baseline studies KW - Hydrologic Models KW - Dams KW - Floods KW - Archives KW - Dam Effects KW - Monitoring systems KW - Hydrologic models KW - Modelling KW - River discharge KW - Precipitation KW - Performance Evaluation KW - Hydrometeorological research KW - Satellite data KW - Dam control KW - Numerical simulations KW - Tropical Rainfall Measuring Mission (TRMM) KW - Monitoring KW - Q2 09148:Palaeo-studies KW - AQ 00007:Industrial Effluents KW - SW 5080:Evaluation, processing and publication KW - M2 556:General (556) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1069200256?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Journal+of+Hydrometeorology&rft.atitle=Evaluation+of+Global+Flood+Detection+Using+Satellite-Based+Rainfall+and+a+Hydrologic+Model&rft.au=Wu%2C+Huan%3BAdler%2C+Robert+F%3BHong%2C+Yang%3BTian%2C+Yudong%3BPolicelli%2C+Fritz&rft.aulast=Wu&rft.aufirst=Huan&rft.date=2012-08-01&rft.volume=13&rft.issue=4&rft.spage=1268&rft.isbn=&rft.btitle=&rft.title=Journal+of+Hydrometeorology&rft.issn=1525755X&rft_id=info:doi/10.1175%2FJHM-D-11-087.1 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Number of references - 35 N1 - Last updated - 2014-05-15 N1 - SubjectsTermNotLitGenreText - Baseline studies; Frequency analysis; Floods; Dams; Rainfall; River discharge; Archives; Monitoring systems; Modelling; Satellite data; Hydrometeorological research; Dam control; Numerical simulations; Statistical analysis; Tropical Rainfall Measuring Mission (TRMM); Precipitation; Hydrologic models; Evaluation; Performance Evaluation; Statistics; Hydrologic Models; Monitoring; Dam Effects; Freshwater DO - http://dx.doi.org/10.1175/JHM-D-11-087.1 ER - TY - JOUR T1 - Diagnostic efficacy of CT-guided transthoracic needle biopsy and fine needle aspiration in cases of pulmonary infectious disease AN - 1037267765; 22684615 AB - The purpose of our study was to evaluate the efficacy of computed-tomography (CT)-guided transthoracic needle biopsy (TNB) and fine needle aspiration (FNA) in diagnosing pulmonary infectious diseases. We retrospectively reviewed the medical records of patients treated at our institution between October 2006 and September 2009 and identified 161 patients who had undergone CT-guided TNB or FNA. We conducted CT-guided TNB or FNA for the patients if bronchoscopy failed to provide proper diagnosis or if their thoracic lesions were not appropriate targets for bronchoscopy. Twenty-three patients were diagnosed with pulmonary infectious diseases, of whom 17 were diagnosed by CT-guided TNB or FNA; sensitivity was therefore 73.9 % (17/23). The diagnostic rate for Aspergillus infection was especially high (75 %). CT-guided TNB and FNA proved to be effective as alternative methods if bronchoscopy failed to diagnose pulmonary infectious diseases, with acceptable complication rates.[PUBLICATION ABSTRACT] JF - Japanese Journal of Radiology AU - Uruga, Hironori AU - Takaya, Hisashi AU - Hanada, Shigeo AU - Beika, Yuka AU - Miyamoto, Atsushi AU - Morokawa, Nasa AU - Kurosaki, Atsuko AU - Fujii, Takeshi AU - Kishi, Kazuma Y1 - 2012/08// PY - 2012 DA - Aug 2012 SP - 589 EP - 93 CY - Tokyo PB - Springer Science & Business Media VL - 30 IS - 7 SN - 18671071 KW - Medical Sciences--Oncology KW - Pulmonary Aspergillosis -- radiography KW - Biopsy, Fine-Needle KW - Diagnosis, Differential KW - Humans KW - Lung Diseases -- pathology KW - Retrospective Studies KW - Aged KW - Aged, 80 & over KW - Pulmonary Aspergillosis -- pathology KW - Bronchoscopy KW - Adult KW - Middle Aged KW - Sensitivity & Specificity KW - Female KW - Male KW - Tomography, X-Ray Computed -- methods KW - Lung Diseases -- radiography KW - Lung Diseases -- microbiology KW - Radiography, Interventional KW - Biopsy, Needle -- methods UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037267765?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthcompleteshell&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Japanese+Journal+of+Radiology&rft.atitle=Diagnostic+efficacy+of+CT-guided+transthoracic+needle+biopsy+and+fine+needle+aspiration+in+cases+of+pulmonary+infectious+disease&rft.au=Uruga%2C+Hironori%3BTakaya%2C+Hisashi%3BHanada%2C+Shigeo%3BBeika%2C+Yuka%3BMiyamoto%2C+Atsushi%3BMorokawa%2C+Nasa%3BKurosaki%2C+Atsuko%3BFujii%2C+Takeshi%3BKishi%2C+Kazuma&rft.aulast=Uruga&rft.aufirst=Hironori&rft.date=2012-08-01&rft.volume=30&rft.issue=7&rft.spage=589&rft.isbn=&rft.btitle=&rft.title=Japanese+Journal+of+Radiology&rft.issn=18671071&rft_id=info:doi/10.1007%2Fs11604-012-0094-3 LA - English DB - ProQuest Central N1 - Copyright - Japan Radiological Society 2012 N1 - Last updated - 2014-09-06 DO - http://dx.doi.org/10.1007/s11604-012-0094-3 ER - TY - JOUR T1 - Nonmyeloablative conditioning generates autoantigen-encoding bone marrow that prevents and cures an experimental autoimmune disease. AN - 1030503649; 22694476 AB - Autoimmune diseases result from chronic targeted immune responses that lead to tissue pathology and disease. The potential of autologous hematopoietic stem cells transplantation as a treatment for autoimmunity is currently being trialled but disease relapse is an issue. We have previously shown in a mouse model of experimental autoimmune encephalomyelitis (EAE) that the transplantation of bone marrow (BM) transduced to encode the autoantigen myelin oligodendrocyte glycoprotein (MOG) can prevent disease induction. However these studies were performed using lethal irradiation to generate BM chimeras and a critical factor for translation to humans would be the ability to utilize low toxic preconditioning regimes. In this study, treosulfan was used as a nonmyeloablative agent to generate BM chimeras encoding MOG and assessed in models of EAE induction and reversal. We find that treosulfan conditioning can promote a low degree of chimerism that is sufficient to promote antigen specific tolerance and protect mice from EAE. When incorporated into a curative protocol for treating mice with established EAE, nonmyeloablative conditioning and low chimerism was equally efficient in maintaining disease resistance. These studies further underpin the potential and feasibility of utilizing a gene therapy approach to treat autoimmune disease. © Copyright 2012 The American Society of Transplantation and the American Society of Transplant Surgeons. JF - American journal of transplantation : official journal of the American Society of Transplantation and the American Society of Transplant Surgeons AU - Nasa, Z AU - Chung, J-Y AU - Chan, J AU - Toh, B-H AU - Alderuccio, F AD - Department of Immunology, Central Clinical School, Monash University, Clayton, Victoria, Australia. Y1 - 2012/08// PY - 2012 DA - August 2012 SP - 2062 EP - 2071 VL - 12 IS - 8 KW - Autoantigens KW - 0 KW - DNA Primers KW - treosulfan KW - CO61ER3EPI KW - Busulfan KW - G1LN9045DK KW - Index Medicus KW - Animals KW - Base Sequence KW - Busulfan -- pharmacology KW - Busulfan -- analogs & derivatives KW - Humans KW - Mice, Inbred C57BL KW - Enzyme-Linked Immunosorbent Assay KW - Mice KW - Flow Cytometry KW - Reverse Transcriptase Polymerase Chain Reaction KW - Female KW - Transplantation Conditioning KW - Autoantigens -- immunology KW - Autoimmune Diseases -- surgery KW - Bone Marrow -- immunology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1030503649?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Atoxline&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=American+journal+of+transplantation+%3A+official+journal+of+the+American+Society+of+Transplantation+and+the+American+Society+of+Transplant+Surgeons&rft.atitle=Nonmyeloablative+conditioning+generates+autoantigen-encoding+bone+marrow+that+prevents+and+cures+an+experimental+autoimmune+disease.&rft.au=Nasa%2C+Z%3BChung%2C+J-Y%3BChan%2C+J%3BToh%2C+B-H%3BAlderuccio%2C+F&rft.aulast=Nasa&rft.aufirst=Z&rft.date=2012-08-01&rft.volume=12&rft.issue=8&rft.spage=2062&rft.isbn=&rft.btitle=&rft.title=American+journal+of+transplantation+%3A+official+journal+of+the+American+Society+of+Transplantation+and+the+American+Society+of+Transplant+Surgeons&rft.issn=1600-6143&rft_id=info:doi/10.1111%2Fj.1600-6143.2012.04068.x LA - English DB - ProQuest Environmental Science Collection N1 - Date completed - 2012-12-26 N1 - Date created - 2012-07-31 N1 - Date revised - 2017-01-13 N1 - Last updated - 2017-01-18 DO - http://dx.doi.org/10.1111/j.1600-6143.2012.04068.x ER - TY - CPAPER T1 - Horticulture for Space: A Classic Exercise in Controlled Environment Resarch T2 - 109th Annual Conference of the American Society for Horticultural Science (ASHS 2012) AN - 1313076779; 6143873 JF - 109th Annual Conference of the American Society for Horticultural Science (ASHS 2012) AU - Wheeler, Raymond Y1 - 2012/07/31/ PY - 2012 DA - 2012 Jul 31 KW - Horticulture KW - Physical training UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1313076779?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Acpi&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=conference&rft.jtitle=109th+Annual+Conference+of+the+American+Society+for+Horticultural+Science+%28ASHS+2012%29&rft.atitle=Horticulture+for+Space%3A+A+Classic+Exercise+in+Controlled+Environment+Resarch&rft.au=Wheeler%2C+Raymond&rft.aulast=Wheeler&rft.aufirst=Raymond&rft.date=2012-07-31&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=109th+Annual+Conference+of+the+American+Society+for+Horticultural+Science+%28ASHS+2012%29&rft.issn=&rft_id=info:doi/ L2 - http://www.ashs.org/downloads/2012ASHSConference-Program.pdf LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2013-02-26 N1 - Last updated - 2013-02-28 ER - TY - JOUR T1 - EXTREME-ULTRAVIOLET SPECTROSCOPIC OBSERVATION OF DIRECT CORONAL HEATING DURING A C-CLASS SOLAR FLARE AN - 1701478492; PQ0001745711 AB - With the Coronal Diagnostic Spectrometer operating in rapid cadence (9.8 s) stare mode during a C6.6 flare on the solar disk, we observed a sudden brightening of Fe XIX line emission (formed at temperature T approximately 8 MK) above the pre-flare noise without a corresponding brightening of emission from ions formed at lower temperatures, including He I (0.01 MK), O V (0.25 MK), and Si XII (2 MK). The sudden brightening persisted as a plateau of Fe XIX intensity that endured more than 11 minutes. The Fe XIX emission at the rise and during the life of the plateau showed no evidence of significant bulk velocity flows, and hence cannot be attributed to chromospheric evaporation. However, the line width showed a significant broadening at the rise of the plateau, corresponding to nonthermal velocities of at least 89 km s super(-1) due to reconnection outflows or turbulence. During the plateau He I, O V, and Si XII brightened at successively later times starting about 3.5 minutes after Fe XIX, which suggests that these brightenings were produced by thermal conduction from the plasma that produced the Fe XIX line emission; however, we cannot rule out the possibility that they were produced by a weak beam of nonthermal particles. We interpret an observed shortening of the O V wavelength for about 1.5 minutes toward the middle of the plateau to indicate new upward motions driven by the flare, as occurs during gentle chromospheric evaporation; relative to a quiescent interval shortly before the flare, the O V upward velocity was around -10 km s super(-1). JF - Astrophysical Journal AU - Brosius, Jeffrey W AD - Catholic University of America at NASA Goddard Space Flight Center, Solar Physics Laboratory, Code 671, Greenbelt, MD 20771, USA, Jeffrey.W.Brosius@nasa.gov Y1 - 2012/07/20/ PY - 2012 DA - 2012 Jul 20 SP - 1 EP - 8 PB - IOP Publishing, The Public Ledger Building, Suite 929 Philadelphia PA 19106 United States VL - 754 IS - 1 SN - 0004-637X, 0004-637X KW - Pollution Abstracts; Meteorological & Geoastrophysical Abstracts KW - Sun: activity KW - Sun: corona KW - Sun: flares KW - Sun: transition region KW - Sun: UV radiation KW - Sun: X-rays, gamma rays KW - Ions KW - Solar emissions KW - Solar flares KW - Evaporation KW - Solar flare emissions KW - Acoustic waves KW - Temperature KW - Outflow KW - Velocity KW - Particulates KW - Plateaus KW - Spectroscopic investigation KW - Solar ions KW - Emissions KW - Coronal heating KW - Coronal emission lines KW - Noise pollution KW - Turbulence KW - P 0000:AIR POLLUTION KW - M2 523.985:Solar Flares (523.985) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1701478492?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apollution&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Astrophysical+Journal&rft.atitle=EXTREME-ULTRAVIOLET+SPECTROSCOPIC+OBSERVATION+OF+DIRECT+CORONAL+HEATING+DURING+A+C-CLASS+SOLAR+FLARE&rft.au=Brosius%2C+Jeffrey+W&rft.aulast=Brosius&rft.aufirst=Jeffrey&rft.date=2012-07-20&rft.volume=754&rft.issue=1&rft.spage=1&rft.isbn=&rft.btitle=&rft.title=Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F754%2F1%2F54 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2015-08-01 N1 - Last updated - 2015-11-16 N1 - SubjectsTermNotLitGenreText - Spectroscopic investigation; Solar emissions; Solar flare emissions; Evaporation; Solar flares; Acoustic waves; Solar ions; Coronal heating; Coronal emission lines; Noise pollution; Ions; Plateaus; Outflow; Temperature; Emissions; Velocity; Particulates; Turbulence DO - http://dx.doi.org/10.1088/0004-637X/754/1/54 ER - TY - JOUR T1 - A reduced organic carbon component in Martian basalts AN - 1080607978; 2012-084254 AB - The source and nature of carbon on Mars have been a subject of intense speculation. We report the results of confocal Raman imaging spectroscopy on 11 martian meteorites, spanning about 4.2 billion years of martian history. Ten of the meteorites contain abiotic macromolecular carbon (MMC) phases detected in association with small oxide grains included within high-temperature minerals. Polycyclic aromatic hydrocarbons were detected along with MMC phases in Dar al Gani 476. The association of organic carbon within magmatic minerals indicates that martian magmas favored precipitation of reduced carbon species during crystallization. The ubiquitous distribution of abiotic organic carbon in martian igneous rocks is important for understanding the martian carbon cycle and has implications for future missions to detect possible past martian life. JF - Science AU - Steele, A AU - McCubbin, F M AU - Fries, M AU - Kater, L AU - Boctor, N Z AU - Fogel, M L AU - Conrad, P G AU - Glamoclija, M AU - Spencer, M AU - Morrow, A L AU - Hammond, M R AU - Zare, R N AU - Vicenzi, E P AU - Siljestrom, S AU - Bowden, R AU - Herd, C D K AU - Mysen, B O AU - Shirey, S B AU - Amundsen, H E F AU - Treiman, A H AU - Bullock, E S AU - Jull, A J T Y1 - 2012/07/13/ PY - 2012 DA - 2012 Jul 13 SP - 212 EP - 215 PB - American Association for the Advancement of Science, Washington, DC VL - 337 IS - 6091 SN - 0036-8075, 0036-8075 KW - volcanic rocks KW - stony meteorites KW - Martian meteorites KW - igneous rocks KW - DaG 476 KW - Mars KW - SNC Meteorites KW - meteorites KW - Dar al Gani Meteorites KW - carbon KW - basalts KW - spectra KW - organic carbon KW - geochemistry KW - achondrites KW - terrestrial planets KW - planets KW - organic compounds KW - Raman spectra KW - shergottite KW - parent materials KW - hydrocarbons KW - polycyclic aromatic hydrocarbons KW - aromatic hydrocarbons KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1080607978?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Science&rft.atitle=A+reduced+organic+carbon+component+in+Martian+basalts&rft.au=Steele%2C+A%3BMcCubbin%2C+F+M%3BFries%2C+M%3BKater%2C+L%3BBoctor%2C+N+Z%3BFogel%2C+M+L%3BConrad%2C+P+G%3BGlamoclija%2C+M%3BSpencer%2C+M%3BMorrow%2C+A+L%3BHammond%2C+M+R%3BZare%2C+R+N%3BVicenzi%2C+E+P%3BSiljestrom%2C+S%3BBowden%2C+R%3BHerd%2C+C+D+K%3BMysen%2C+B+O%3BShirey%2C+S+B%3BAmundsen%2C+H+E+F%3BTreiman%2C+A+H%3BBullock%2C+E+S%3BJull%2C+A+J+T&rft.aulast=Steele&rft.aufirst=A&rft.date=2012-07-13&rft.volume=337&rft.issue=6091&rft.spage=212&rft.isbn=&rft.btitle=&rft.title=Science&rft.issn=00368075&rft_id=info:doi/10.1126%2Fscience.1220715 L2 - http://www.sciencemag.org/ LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 41 N1 - PubXState - DC N1 - Document feature - illus. N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-09-27 N1 - CODEN - SCIEAS N1 - SubjectsTermNotLitGenreText - achondrites; aromatic hydrocarbons; basalts; carbon; DaG 476; Dar al Gani Meteorites; geochemistry; hydrocarbons; igneous rocks; Mars; Martian meteorites; meteorites; organic carbon; organic compounds; parent materials; planets; polycyclic aromatic hydrocarbons; Raman spectra; shergottite; SNC Meteorites; spectra; stony meteorites; terrestrial planets; volcanic rocks DO - http://dx.doi.org/10.1126/science.1220715 ER - TY - NEWS T1 - 2012 Noctilucent Cloud Season Begins AN - 1024562986 JF - UPI Space Daily AU - Dr. Tony Phillips for NASA Science News Y1 - 2012/07/12/ PY - 2012 DA - 2012 Jul 12 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1024562986?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=2012+Noctilucent+Cloud+Season+Begins&rft.au=Dr.+Tony+Phillips+for+NASA+Science+News&rft.aulast=Dr.+Tony+Phillips+for+NASA+Science+News&rft.aufirst=&rft.date=2012-07-12&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-07-12 ER - TY - JOUR T1 - Spatial analysis of the polycyclic aromatic hydrocarbon features southeast of the Orion Bar AN - 1549620761; 2014-058658 AB - Polycyclic aromatic hydrocarbon (PAH) and dust emission features between 10 and 37 mu m, observed with Spitzer at 11 positions southeast of the Bright Bar (BB) in Orion, are analyzed and connected to atomic and H (sub 2) lines reported earlier. Variations at these positions indicate changes in local conditions and materials sampled. The major findings are: (1) PAH erosion and destruction are important from the BB out to about 5'. (2) The ionized PAH fraction, inferred from the 11.0 mu m PAH band, increases from the BB out to 6.'5. This counterintuitive behavior is linked to PAH dehydrogenation. (3) The "11.2" mu m PAH band profile shifts from class A (sub 11.2) to A(B) (sub 11.2) between 9' and 10', indicating these lines-of-sight probe a different environment, likely shielded molecular cloud material. (4) The different spatial behavior of the PAH bands and the 10-15 mu m plateau supports the view that the plateau originates in a separate carrier. (5) The fullerene/PAH band strength ratio decreases out to about 7', increases between 9' and 10' and drops at 12'. The first region is where PAHs are dehydrogenated and eroded whereas the second, shielded zone, is where the "11.2" mu m profile shifts and PAH erosion is unlikely. This suggests fullerenes are intimately mixed with PAHs in shielded regions. Taken together, the observations suggest three different regimes are sampled: (1) the H II region-photodissociation region (PDR) interface directly southeast of the BB, (2) shielded molecular cloud material farther out, and (3) the H II region-PDR interface seen limb brightened at the outermost position. Copyright (Copyright) 2012. The American Astronomical Society. All rights reserved. JF - The = Astrophysical Journal AU - Boersma, C AU - Rubin, R H AU - Allamandola, L J Y1 - 2012/07/10/ PY - 2012 DA - 2012 Jul 10 EP - Paper No. 168 PB - University of Chicago Press for the American Astronomical Society, Chicago, IL VL - 753 IS - 2 SN - 0004-637X, 0004-637X KW - Spitzer Space Telescope KW - cosmochemistry KW - Orion Bar KW - infrared spectra KW - organic compounds KW - cosmic dust KW - molecular clouds KW - hydrogen KW - Orion Nebula KW - hydrocarbons KW - dehydrogenation KW - polycyclic aromatic hydrocarbons KW - photodissociation KW - spectra KW - interstellar dust KW - aromatic hydrocarbons KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1549620761?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=The+%3D+Astrophysical+Journal&rft.atitle=Spatial+analysis+of+the+polycyclic+aromatic+hydrocarbon+features+southeast+of+the+Orion+Bar&rft.au=Boersma%2C+C%3BRubin%2C+R+H%3BAllamandola%2C+L+J&rft.aulast=Boersma&rft.aufirst=C&rft.date=2012-07-10&rft.volume=753&rft.issue=2&rft.spage=&rft.isbn=&rft.btitle=&rft.title=The+%3D+Astrophysical+Journal&rft.issn=0004637X&rft_id=info:doi/10.1088%2F0004-637X%2F753%2F2%2F168 L2 - http://iopscience.iop.org/0004-637X LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2014, American Geosciences Institute. Reference includes data supplied by IOP Publishing Ltd., London, United Kingdom N1 - Date revised - 2014-01-01 N1 - Number of references - 48 N1 - PubXState - IL N1 - Document feature - illus. incl. 2 tables N1 - Last updated - 2014-07-31 N1 - SubjectsTermNotLitGenreText - aromatic hydrocarbons; cosmic dust; cosmochemistry; dehydrogenation; hydrocarbons; hydrogen; infrared spectra; interstellar dust; molecular clouds; organic compounds; Orion Bar; Orion Nebula; photodissociation; polycyclic aromatic hydrocarbons; spectra; Spitzer Space Telescope DO - http://dx.doi.org/10.1088/0004-637X/753/2/168 ER - TY - NEWS T1 - Why Won't the Supernova Explode? AN - 1024116243 JF - UPI Space Daily AU - Patrick Barry for NASA Science News Y1 - 2012/07/09/ PY - 2012 DA - 2012 Jul 09 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1024116243?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Why+Won%27t+the+Supernova+Explode%3F&rft.au=Patrick+Barry+for+NASA+Science+News&rft.aulast=Patrick+Barry+for+NASA+Science+News&rft.aufirst=&rft.date=2012-07-09&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-07-09 ER - TY - NEWS T1 - Landsat Sets the Standard for Maps of World's Forests AN - 1023499236 JF - UPI Space Daily AU - Aries Keck for NASA's Earth Science News Y1 - 2012/07/06/ PY - 2012 DA - 2012 Jul 06 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1023499236?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=Landsat+Sets+the+Standard+for+Maps+of+World%27s+Forests&rft.au=Aries+Keck+for+NASA%27s+Earth+Science+News&rft.aulast=Aries+Keck+for+NASA%27s+Earth+Science+News&rft.aufirst=&rft.date=2012-07-06&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-07-06 ER - TY - NEWS T1 - NASA Releases Workshop Data and Findings on Asteroid 2011 AG5 AN - 1023192091 JF - UPI Space Daily AU - Dwayne Brown for NASA News Y1 - 2012/07/04/ PY - 2012 DA - 2012 Jul 04 CY - Washington KW - Aeronautics And Space Flight UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1023192091?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Apqrl&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=unknown&rft.jtitle=UPI+Space+Daily&rft.atitle=NASA+Releases+Workshop+Data+and+Findings+on+Asteroid+2011+AG5&rft.au=Dwayne+Brown+for+NASA+News&rft.aulast=Dwayne+Brown+for+NASA+News&rft.aufirst=&rft.date=2012-07-04&rft.volume=&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=UPI+Space+Daily&rft.issn=&rft_id=info:doi/ LA - English DB - ProQuest Central N1 - Copyright - Copyright (c) by United Press International. All Rights Reserved. N1 - Last updated - 2012-07-04 ER - TY - JOUR T1 - Unusual chemical diversity in solvent soluble polar fractions of the Sutter's Mill carbonaceous chondrites AN - 1849310393; 2016-107580 JF - Meteoritics & Planetary Science AU - Schmitt-Kopplin, P AU - Harir, M AU - Hertkorn, N AU - Jenniskens, P AU - Waiblinger, M AU - Gabelica, Z AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5359 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - meteorites KW - organic compounds KW - stony meteorites KW - solutes KW - Sutter's Mill Meteorite KW - CM chondrites KW - carbonaceous chondrites KW - heterogeneity KW - chondrites KW - chemical composition KW - meteorite falls KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849310393?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Unusual+chemical+diversity+in+solvent+soluble+polar+fractions+of+the+Sutter%27s+Mill+carbonaceous+chondrites&rft.au=Schmitt-Kopplin%2C+P%3BHarir%2C+M%3BHertkorn%2C+N%3BJenniskens%2C+P%3BWaiblinger%2C+M%3BGabelica%2C+Z%3BAnonymous&rft.aulast=Schmitt-Kopplin&rft.aufirst=P&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5359.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 4 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 31, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - carbonaceous chondrites; chemical composition; chondrites; CM chondrites; heterogeneity; meteorite falls; meteorites; organic compounds; solutes; stony meteorites; Sutter's Mill Meteorite ER - TY - JOUR T1 - Thermoluminescence characterization of the Sutter's Mill Meteorite AN - 1849307351; 2016-107585 JF - Meteoritics & Planetary Science AU - Sears, Derek W G AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5098 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - meteorites KW - breccia KW - stony meteorites KW - brecciation KW - Sutter's Mill Meteorite KW - anomalies KW - thermoluminescence KW - CM chondrites KW - carbonaceous chondrites KW - chondrites KW - metamorphism KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307351?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Thermoluminescence+characterization+of+the+Sutter%27s+Mill+Meteorite&rft.au=Sears%2C+Derek+W+G%3BAnonymous&rft.aulast=Sears&rft.aufirst=Derek+W&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5098.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 9 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 31, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - anomalies; breccia; brecciation; carbonaceous chondrites; chondrites; CM chondrites; metamorphism; meteorites; stony meteorites; Sutter's Mill Meteorite; thermoluminescence ER - TY - JOUR T1 - The age of Haughton impact structure as determined by zircon (U-Th)/He thermochronology AN - 1849307316; 2016-107661 JF - Meteoritics & Planetary Science AU - Young, Kelsey E AU - van Soest, M C AU - Hodges, K V AU - Adams, B A AU - Lee, P AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5299 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - zircon group KW - silicates KW - breccia KW - impact features KW - zircon KW - Miocene KW - nesosilicates KW - Cenozoic KW - (U-Th)/He KW - Tertiary KW - Canada KW - dates KW - Neogene KW - Nunavut KW - orthosilicates KW - absolute age KW - thermochronology KW - Haughton impact structure KW - impact craters KW - 23:Geomorphology KW - 03:Geochronology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307316?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=The+age+of+Haughton+impact+structure+as+determined+by+zircon+%28U-Th%29%2FHe+thermochronology&rft.au=Young%2C+Kelsey+E%3Bvan+Soest%2C+M+C%3BHodges%2C+K+V%3BAdams%2C+B+A%3BLee%2C+P%3BAnonymous&rft.aulast=Young&rft.aufirst=Kelsey&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5299.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 5 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 26, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - (U-Th)/He; absolute age; breccia; Canada; Cenozoic; dates; Haughton impact structure; impact craters; impact features; Miocene; Neogene; nesosilicates; Nunavut; orthosilicates; silicates; Tertiary; thermochronology; zircon; zircon group ER - TY - JOUR T1 - NanoSIMS imaging of volatile elements (H, C, F and S) in shergottites AN - 1849307308; 2016-107631 JF - Meteoritics & Planetary Science AU - Wang, J AU - Usui, T AU - Alexander, C M O'D AU - Simon, Justin I AU - Jones, J H AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5291 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - Yamato Meteorites KW - stony meteorites KW - ion probe data KW - Martian meteorites KW - halogens KW - Y 980456 KW - mass spectra KW - achondrites KW - SNC Meteorites KW - meteorites KW - cracks KW - shergottite KW - LAR 06319 KW - fluorine KW - volatile elements KW - hydrogen KW - carbon KW - sulfur KW - NanoSIMS KW - spectra KW - Larkman Nunatak Meteorites KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307308?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=NanoSIMS+imaging+of+volatile+elements+%28H%2C+C%2C+F+and+S%29+in+shergottites&rft.au=Wang%2C+J%3BUsui%2C+T%3BAlexander%2C+C+M+O%27D%3BSimon%2C+Justin+I%3BJones%2C+J+H%3BAnonymous&rft.aulast=Wang&rft.aufirst=J&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5291.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 24, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; carbon; cracks; fluorine; halogens; hydrogen; ion probe data; LAR 06319; Larkman Nunatak Meteorites; Martian meteorites; mass spectra; meteorites; NanoSIMS; shergottite; SNC Meteorites; spectra; stony meteorites; sulfur; volatile elements; Y 980456; Yamato Meteorites ER - TY - JOUR T1 - (super 40) Argon- (super 39) Argon ages of centimeter-sized impact melt clasts from ancient regolith breccia 60016 AN - 1849307301; 2016-107603 JF - Meteoritics & Planetary Science AU - Swindle, T D AU - Beard, S P AU - Isachsen, C E AU - Kring, D A AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5048 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - Ar/Ar KW - diffusion KW - breccia KW - Moon KW - Apollo Program KW - Sample 60016 KW - clasts KW - melts KW - temperature KW - impact melts KW - lunar samples KW - chronology KW - whole rock KW - dates KW - low temperature KW - absolute age KW - regolith KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307301?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=%28super+40%29+Argon-+%28super+39%29+Argon+ages+of+centimeter-sized+impact+melt+clasts+from+ancient+regolith+breccia+60016&rft.au=Swindle%2C+T+D%3BBeard%2C+S+P%3BIsachsen%2C+C+E%3BKring%2C+D+A%3BAnonymous&rft.aulast=Swindle&rft.aufirst=T&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5048.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 31, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - absolute age; Apollo Program; Ar/Ar; breccia; chronology; clasts; dates; diffusion; impact melts; low temperature; lunar samples; melts; Moon; regolith; Sample 60016; temperature; whole rock ER - TY - JOUR T1 - Indigenous carbonaceous phases embedded within surface deposits on Apollo 17 volcanic glass beads AN - 1849307300; 2016-107610 JF - Meteoritics & Planetary Science AU - Thomas-Keprta, K L AU - Clemett, S J AU - Ross, D K AU - Le, L AU - McKay, D S AU - Gibson, E K AU - Gonzalez, C AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5282 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - reworking KW - volcanic rocks KW - Sample 74220 KW - igneous rocks KW - Apollo Program KW - meteoroids KW - interplanetary dust KW - meteorites KW - volcanism KW - cosmic rays KW - heterogeneity KW - carbonaceous composition KW - accretion KW - Moon KW - weathering KW - pyroclastics KW - micrometeorites KW - space weathering KW - organic compounds KW - lunar samples KW - cosmic dust KW - solar radiation KW - regolith KW - Apollo 17 KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307300?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Indigenous+carbonaceous+phases+embedded+within+surface+deposits+on+Apollo+17+volcanic+glass+beads&rft.au=Thomas-Keprta%2C+K+L%3BClemett%2C+S+J%3BRoss%2C+D+K%3BLe%2C+L%3BMcKay%2C+D+S%3BGibson%2C+E+K%3BGonzalez%2C+C%3BAnonymous&rft.aulast=Thomas-Keprta&rft.aufirst=K&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5282.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 8 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 31, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - accretion; Apollo 17; Apollo Program; carbonaceous composition; cosmic dust; cosmic rays; heterogeneity; igneous rocks; interplanetary dust; lunar samples; meteorites; meteoroids; micrometeorites; Moon; organic compounds; pyroclastics; regolith; reworking; Sample 74220; solar radiation; space weathering; volcanic rocks; volcanism; weathering ER - TY - JOUR T1 - Rates of space weathering in regolith grains AN - 1849307239; 2016-107665 JF - Meteoritics & Planetary Science AU - Zhang, S AU - Keller, L P AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5267 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - maturity KW - irradiation KW - asteroids KW - solar wind KW - anorthite KW - framework silicates KW - lunar soils KW - plagioclase KW - Moon KW - grain size KW - rates KW - electron microscopy data KW - highlands KW - maria KW - weathering KW - TEM data KW - space weathering KW - lunar samples KW - Sample 10084 KW - weathering rates KW - feldspar group KW - Sample 61181 KW - regolith KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307239?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Rates+of+space+weathering+in+regolith+grains&rft.au=Zhang%2C+S%3BKeller%2C+L+P%3BAnonymous&rft.aulast=Zhang&rft.aufirst=S&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5267.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 6 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 26, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - anorthite; asteroids; electron microscopy data; feldspar group; framework silicates; grain size; highlands; irradiation; lunar samples; lunar soils; maria; maturity; Moon; plagioclase; rates; regolith; Sample 10084; Sample 61181; silicates; solar wind; space weathering; TEM data; weathering; weathering rates ER - TY - JOUR T1 - Rb-Sr isotopic systematics of alkali-rich fragments in Yamato-74442 and Bhola AN - 1849307222; 2016-107659 JF - Meteoritics & Planetary Science AU - Yokoyama, Tatsunori AU - Misawa, K AU - Okano, O AU - Shih, C Y AU - Nyquist, L E AU - Simon, Justin I AU - Tappa, M J AU - Yoneda, S AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5187 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - ordinary chondrites KW - fragmentation KW - stony meteorites KW - isotopes KW - enrichment KW - stable isotopes KW - temperature KW - Rb/Sr KW - meteorites KW - cesium KW - dates KW - absolute age KW - condensates KW - chondrites KW - alkaline earth metals KW - Yamato Meteorites KW - Bhola Meteorite KW - breccia KW - condensation KW - isotope ratios KW - rubidium KW - alkali metals KW - LL chondrites KW - Y 74442 KW - solar nebula KW - Sr-87/Sr-86 KW - volatiles KW - metals KW - fragments KW - potassium KW - strontium KW - chemical fractionation KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307222?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Rb-Sr+isotopic+systematics+of+alkali-rich+fragments+in+Yamato-74442+and+Bhola&rft.au=Yokoyama%2C+Tatsunori%3BMisawa%2C+K%3BOkano%2C+O%3BShih%2C+C+Y%3BNyquist%2C+L+E%3BSimon%2C+Justin+I%3BTappa%2C+M+J%3BYoneda%2C+S%3BAnonymous&rft.aulast=Yokoyama&rft.aufirst=Tatsunori&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5187.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 10 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 26, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - absolute age; alkali metals; alkaline earth metals; Bhola Meteorite; breccia; cesium; chemical fractionation; chondrites; condensates; condensation; dates; enrichment; fragmentation; fragments; isotope ratios; isotopes; LL chondrites; metals; meteorites; ordinary chondrites; potassium; Rb/Sr; rubidium; solar nebula; Sr-87/Sr-86; stable isotopes; stony meteorites; strontium; temperature; volatiles; Y 74442; Yamato Meteorites ER - TY - JOUR T1 - Sutter's Mill; possible mixing of C and E asteroids AN - 1849307220; 2016-107668 JF - Meteoritics & Planetary Science AU - Zolensky, Michael E AU - Mikouchi, T AU - Hagiya, K AU - Ohsumi, K AU - Komatsu, M AU - Jenniskens, P AU - Le, L AU - Ross, D K AU - Yin, Q Z AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5264 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - stony meteorites KW - asteroids KW - X-ray diffraction data KW - calcium-aluminum inclusions KW - olivine group KW - oldhamite KW - synchrotron radiation KW - meteorites KW - pyroxene group KW - mineral composition KW - mixing KW - olivine KW - inclusions KW - orthosilicates KW - chondrites KW - chain silicates KW - C-type asteroids KW - breccia KW - parent bodies KW - alkali metals KW - Sutter's Mill Meteorite KW - thermal metamorphism KW - carbonaceous chondrites KW - sodium KW - veins KW - metamorphism KW - nesosilicates KW - aqueous alteration KW - metals KW - potassium KW - E-type asteroids KW - CM chondrites KW - sulfides KW - regolith KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307220?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Sutter%27s+Mill%3B+possible+mixing+of+C+and+E+asteroids&rft.au=Zolensky%2C+Michael+E%3BMikouchi%2C+T%3BHagiya%2C+K%3BOhsumi%2C+K%3BKomatsu%2C+M%3BJenniskens%2C+P%3BLe%2C+L%3BRoss%2C+D+K%3BYin%2C+Q+Z%3BAnonymous&rft.aulast=Zolensky&rft.aufirst=Michael&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5264.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 1 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 26, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - alkali metals; aqueous alteration; asteroids; breccia; C-type asteroids; calcium-aluminum inclusions; carbonaceous chondrites; chain silicates; chondrites; CM chondrites; E-type asteroids; inclusions; metals; metamorphism; meteorites; mineral composition; mixing; nesosilicates; oldhamite; olivine; olivine group; orthosilicates; parent bodies; potassium; pyroxene group; regolith; silicates; sodium; stony meteorites; sulfides; Sutter's Mill Meteorite; synchrotron radiation; thermal metamorphism; veins; X-ray diffraction data ER - TY - JOUR T1 - Mineralogy and oxygen isotope compositions of two C-rich hydrated interplanetary dust particles AN - 1849307204; 2016-107589 JF - Meteoritics & Planetary Science AU - Snead, C J AU - Keller, L P AU - McKeegan, K D AU - Messenger, S AU - Nakamura-Messenger, K AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5378 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - oxygen KW - ion probe data KW - isotopes KW - siliceous composition KW - mass spectra KW - interplanetary dust KW - stable isotopes KW - mineral composition KW - carbon KW - oxides KW - spectra KW - O-17/O-16 KW - carbonaceous composition KW - amorphous materials KW - isotope ratios KW - saponite KW - electron microscopy data KW - O-18/O-16 KW - TEM data KW - clay minerals KW - hydration KW - cosmic dust KW - iron sulfides KW - sheet silicates KW - NanoSIMS KW - sulfides KW - magnetite KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849307204?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Mineralogy+and+oxygen+isotope+compositions+of+two+C-rich+hydrated+interplanetary+dust+particles&rft.au=Snead%2C+C+J%3BKeller%2C+L+P%3BMcKeegan%2C+K+D%3BMessenger%2C+S%3BNakamura-Messenger%2C+K%3BAnonymous&rft.aulast=Snead&rft.aufirst=C&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - http://www.lpi.usra.edu/meetings/metsoc2012/pdf/5378.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 4 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 31, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - amorphous materials; carbon; carbonaceous composition; clay minerals; cosmic dust; electron microscopy data; hydration; interplanetary dust; ion probe data; iron sulfides; isotope ratios; isotopes; magnetite; mass spectra; mineral composition; NanoSIMS; O-17/O-16; O-18/O-16; oxides; oxygen; saponite; sheet silicates; silicates; siliceous composition; spectra; stable isotopes; sulfides; TEM data ER - TY - JOUR T1 - Nature of reduced carbon in Martian meteorites AN - 1849297884; 2016-104382 JF - Meteoritics & Planetary Science AU - Gibson, Everett K, Jr AU - McKay, D S AU - Thomas-Keprta, K L AU - Clemett, Simon J AU - White, L M AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5306 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - carbonaceous composition KW - nakhlite KW - stony meteorites KW - iddingsite KW - Martian meteorites KW - astrobiology KW - Nakhla Meteorite KW - achondrites KW - SNC Meteorites KW - aqueous alteration KW - meteorites KW - Tissint Meteorite KW - carbon KW - reduction KW - organic carbon KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297884?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Nature+of+reduced+carbon+in+Martian+meteorites&rft.au=Gibson%2C+Everett+K%2C+Jr%3BMcKay%2C+D+S%3BThomas-Keprta%2C+K+L%3BClemett%2C+Simon+J%3BWhite%2C+L+M%3BAnonymous&rft.aulast=Gibson&rft.aufirst=Everett&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5306.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 1, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - achondrites; aqueous alteration; astrobiology; carbon; carbonaceous composition; iddingsite; Martian meteorites; meteorites; Nakhla Meteorite; nakhlite; organic carbon; reduction; SNC Meteorites; stony meteorites; Tissint Meteorite ER - TY - JOUR T1 - Sulfide formation in CM chondrites; nebula vs. parent body processes AN - 1849297656; 2016-104407 JF - Meteoritics & Planetary Science AU - Harries, Dennis AU - Langenhorst, F AU - Zolensky, M E AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5065 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - Yamato Meteorites KW - stony meteorites KW - pentlandite KW - parent bodies KW - electron microscopy data KW - carbonaceous chondrites KW - solution KW - intergrowths KW - TEM data KW - temperature KW - hydrothermal conditions KW - solar nebula KW - meteorites KW - Kaidun Meteorite KW - sulfur KW - Y 791198 KW - exsolution KW - CM chondrites KW - chondrites KW - sulfides KW - pyrrhotite KW - troilite KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297656?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Sulfide+formation+in+CM+chondrites%3B+nebula+vs.+parent+body+processes&rft.au=Harries%2C+Dennis%3BLangenhorst%2C+F%3BZolensky%2C+M+E%3BAnonymous&rft.aulast=Harries&rft.aufirst=Dennis&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5065.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 3 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 9, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - carbonaceous chondrites; chondrites; CM chondrites; electron microscopy data; exsolution; hydrothermal conditions; intergrowths; Kaidun Meteorite; meteorites; parent bodies; pentlandite; pyrrhotite; solar nebula; solution; stony meteorites; sulfides; sulfur; TEM data; temperature; troilite; Y 791198; Yamato Meteorites ER - TY - JOUR T1 - Halogen-substituted methane in Monahans halite AN - 1849297649; 2016-104375 JF - Meteoritics & Planetary Science AU - Fries, Marc D AU - Steele, Andrew AU - Zolensky, Michael AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5381 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - halides KW - ordinary chondrites KW - stony meteorites KW - asteroids KW - halogens KW - aliphatic hydrocarbons KW - astrobiology KW - substitution KW - dwarf planets KW - meteorites KW - transport KW - inclusions KW - geysers KW - chlorides KW - chondrites KW - methane KW - Ceres KW - parent bodies KW - H chondrites KW - alkanes KW - halite KW - early solar system KW - organic compounds KW - Monahans Meteorite KW - brines KW - hydrocarbons KW - exsolution KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297649?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Halogen-substituted+methane+in+Monahans+halite&rft.au=Fries%2C+Marc+D%3BSteele%2C+Andrew%3BZolensky%2C+Michael%3BAnonymous&rft.aulast=Fries&rft.aufirst=Marc&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5381.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 3 N1 - PubXState - AR N1 - SuppNotes - Accessed on Nov. 30, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - aliphatic hydrocarbons; alkanes; asteroids; astrobiology; brines; Ceres; chlorides; chondrites; dwarf planets; early solar system; exsolution; geysers; H chondrites; halides; halite; halogens; hydrocarbons; inclusions; meteorites; methane; Monahans Meteorite; ordinary chondrites; organic compounds; parent bodies; stony meteorites; substitution; transport ER - TY - JOUR T1 - Corundum-hibonite inclusions and the environments of high temperature processing in the early solar system AN - 1849297646; 2016-104524 JF - Meteoritics & Planetary Science AU - Needham, Andrew W AU - Messenger, S AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5384 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - stony meteorites KW - oxygen KW - ion probe data KW - isotopes KW - mass spectra KW - corundum KW - stable isotopes KW - temperature KW - CO chondrites KW - meteorites KW - NanoSIM KW - inclusions KW - ALHA 77307 KW - oxides KW - spectra KW - chondrites KW - O-17/O-16 KW - solar system KW - isotope ratios KW - O-18/O-16 KW - hibonite KW - carbonaceous chondrites KW - early solar system KW - Allan Hills Meteorites KW - high temperature KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297646?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Corundum-hibonite+inclusions+and+the+environments+of+high+temperature+processing+in+the+early+solar+system&rft.au=Needham%2C+Andrew+W%3BMessenger%2C+S%3BAnonymous&rft.aulast=Needham&rft.aufirst=Andrew&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5384.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 19, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - ALHA 77307; Allan Hills Meteorites; carbonaceous chondrites; chondrites; CO chondrites; corundum; early solar system; hibonite; high temperature; inclusions; ion probe data; isotope ratios; isotopes; mass spectra; meteorites; NanoSIM; O-17/O-16; O-18/O-16; oxides; oxygen; solar system; spectra; stable isotopes; stony meteorites; temperature ER - TY - JOUR T1 - Water soluble organic and inorganic anions in Sutter's Mill AN - 1849297643; 2016-104342 JF - Meteoritics & Planetary Science AU - Cooper, George AU - Jenniskens, Petrus AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5399 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - esters KW - chlorine KW - anions KW - sulfate ion KW - acetates KW - stony meteorites KW - halogens KW - Sutter's Mill Meteorite KW - carbonaceous chondrites KW - solubility KW - Murchison Meteorite KW - inorganic materials KW - meteorites KW - organic compounds KW - ion chromatograms KW - chloride ion KW - chromatograms KW - CM chondrites KW - formate KW - chondrites KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297643?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Water+soluble+organic+and+inorganic+anions+in+Sutter%27s+Mill&rft.au=Cooper%2C+George%3BJenniskens%2C+Petrus%3BAnonymous&rft.aulast=Cooper&rft.aufirst=George&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5399.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 2 N1 - PubXState - AR N1 - SuppNotes - Accessed on Nov. 18, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - acetates; anions; carbonaceous chondrites; chloride ion; chlorine; chondrites; chromatograms; CM chondrites; esters; formate; halogens; inorganic materials; ion chromatograms; meteorites; Murchison Meteorite; organic compounds; solubility; stony meteorites; sulfate ion; Sutter's Mill Meteorite ER - TY - JOUR T1 - The macrostructure of the Sutter's Mill Meteorite AN - 1849297635; 2016-104293 JF - Meteoritics & Planetary Science AU - Beauford, R E AU - Arnold, S K AU - Sears, D AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5091 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - breccia KW - stony meteorites KW - thermal alteration KW - textures KW - parent bodies KW - matrix KW - calcium-aluminum inclusions KW - Sutter's Mill Meteorite KW - clasts KW - carbonaceous chondrites KW - meteorite falls KW - meteorites KW - volatiles KW - contraction KW - cracks KW - chondrules KW - inclusions KW - fusion KW - water content KW - dehydration KW - chondrites KW - regolith KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297635?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=The+macrostructure+of+the+Sutter%27s+Mill+Meteorite&rft.au=Beauford%2C+R+E%3BArnold%2C+S+K%3BSears%2C+D%3BAnonymous&rft.aulast=Beauford&rft.aufirst=R&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5091.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 2 N1 - PubXState - AR N1 - SuppNotes - Accessed on Oct. 22, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - breccia; calcium-aluminum inclusions; carbonaceous chondrites; chondrites; chondrules; clasts; contraction; cracks; dehydration; fusion; inclusions; matrix; meteorite falls; meteorites; parent bodies; regolith; stony meteorites; Sutter's Mill Meteorite; textures; thermal alteration; volatiles; water content ER - TY - JOUR T1 - Deducing Wild 2 components with a statistical dataset of olivine in chondrite matrix AN - 1849297623; 2016-104369 JF - Meteoritics & Planetary Science AU - Frank, David R AU - Zolensky, M E AU - Le, L AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5396 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - stony meteorites KW - olivine group KW - iron-rich composition KW - interplanetary dust KW - meteorites KW - fayalite KW - olivine KW - orthosilicates KW - Wild 2 Comet KW - enstatite chondrites KW - chondrites KW - depletion KW - chromium KW - CI chondrites KW - Kakangari Meteorite KW - matrix KW - statistical analysis KW - thermal metamorphism KW - carbonaceous chondrites KW - metamorphism KW - nesosilicates KW - cosmic dust KW - K chondrites KW - comets KW - metals KW - CM chondrites KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297623?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Deducing+Wild+2+components+with+a+statistical+dataset+of+olivine+in+chondrite+matrix&rft.au=Frank%2C+David+R%3BZolensky%2C+M+E%3BLe%2C+L%3BAnonymous&rft.aulast=Frank&rft.aufirst=David&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5396.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 5 N1 - PubXState - AR N1 - Document feature - illus. N1 - SuppNotes - Accessed on Nov. 25, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - carbonaceous chondrites; chondrites; chromium; CI chondrites; CM chondrites; comets; cosmic dust; depletion; enstatite chondrites; fayalite; interplanetary dust; iron-rich composition; K chondrites; Kakangari Meteorite; matrix; metals; metamorphism; meteorites; nesosilicates; olivine; olivine group; orthosilicates; silicates; statistical analysis; stony meteorites; thermal metamorphism; Wild 2 Comet ER - TY - JOUR T1 - Complex formation history of highly evolved basaltic shergottite, Zagami AN - 1849297620; 2016-104527 JF - Meteoritics & Planetary Science AU - Niihara, T AU - Misawa, K AU - Mikouchi, T AU - Nyquist, L E AU - Park, J AU - Yamashita, H AU - Hirata, D AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5075 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - stony meteorites KW - isotopes KW - Martian meteorites KW - olivine group KW - thermal history KW - SNC Meteorites KW - meteorites KW - pyroxene group KW - mineral composition KW - crystal zoning KW - olivine KW - orthosilicates KW - basaltic composition KW - chain silicates KW - alkaline earth metals KW - achondrites KW - nesosilicates KW - shergottite KW - metals KW - Zagami Meteorite KW - petrography KW - crystallization KW - strontium KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297620?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Complex+formation+history+of+highly+evolved+basaltic+shergottite%2C+Zagami&rft.au=Niihara%2C+T%3BMisawa%2C+K%3BMikouchi%2C+T%3BNyquist%2C+L+E%3BPark%2C+J%3BYamashita%2C+H%3BHirata%2C+D%3BAnonymous&rft.aulast=Niihara&rft.aufirst=T&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5075.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 19, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; alkaline earth metals; basaltic composition; chain silicates; crystal zoning; crystallization; isotopes; Martian meteorites; metals; meteorites; mineral composition; nesosilicates; olivine; olivine group; orthosilicates; petrography; pyroxene group; shergottite; silicates; SNC Meteorites; stony meteorites; strontium; thermal history; Zagami Meteorite ER - TY - JOUR T1 - Nitrogen isotopic composition of organic matter in a pristine collection IDP AN - 1849297613; 2016-104503 JF - Meteoritics & Planetary Science AU - Messenger, Scott R AU - Nakamura-Messenger, K AU - Keller, Lindsay P AU - Clemett, Simon J AU - Nguyen, A N AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5334 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - carbonaceous composition KW - N-15/N-14 KW - oxygen KW - ion probe data KW - isotopes KW - isotope ratios KW - mass spectra KW - electron microscopy data KW - interplanetary dust KW - TEM data KW - stable isotopes KW - nitrogen KW - organic compounds KW - cosmic dust KW - composition KW - NanoSIMS KW - spectra KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297613?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Nitrogen+isotopic+composition+of+organic+matter+in+a+pristine+collection+IDP&rft.au=Messenger%2C+Scott+R%3BNakamura-Messenger%2C+K%3BKeller%2C+Lindsay+P%3BClemett%2C+Simon+J%3BNguyen%2C+A+N%3BAnonymous&rft.aulast=Messenger&rft.aufirst=Scott&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5334.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 11 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 12, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - carbonaceous composition; composition; cosmic dust; electron microscopy data; interplanetary dust; ion probe data; isotope ratios; isotopes; mass spectra; N-15/N-14; NanoSIMS; nitrogen; organic compounds; oxygen; spectra; stable isotopes; TEM data ER - TY - JOUR T1 - Composition and petrology of HED polymict breccias; the regolith of (4) Vesta AN - 1849297606; 2016-104510 JF - Meteoritics & Planetary Science AU - Mittlefehldt, David W AU - Cartwright, Julia A AU - Herrin, J S AU - Mertzman, S A AU - Mertzman, K R AU - Peng, Z X AU - Quinn, J E AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5331 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - calcium KW - neutron activation analysis data KW - stony meteorites KW - asteroids KW - mass spectra KW - meteorites KW - noble gases KW - neon KW - aluminum KW - X-ray fluorescence spectra KW - spectra KW - trace elements KW - chemical composition KW - alkaline earth metals KW - breccia KW - Vesta Asteroid KW - HED meteorites KW - diogenite KW - achondrites KW - ICP mass spectra KW - metals KW - nickel KW - eucrite KW - polymict breccia KW - regolith KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297606?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Composition+and+petrology+of+HED+polymict+breccias%3B+the+regolith+of+%284%29+Vesta&rft.au=Mittlefehldt%2C+David+W%3BCartwright%2C+Julia+A%3BHerrin%2C+J+S%3BMertzman%2C+S+A%3BMertzman%2C+K+R%3BPeng%2C+Z+X%3BQuinn%2C+J+E%3BAnonymous&rft.aulast=Mittlefehldt&rft.aufirst=David&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5331.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 6 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 14, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; alkaline earth metals; aluminum; asteroids; breccia; calcium; chemical composition; diogenite; eucrite; HED meteorites; ICP mass spectra; mass spectra; metals; meteorites; neon; neutron activation analysis data; nickel; noble gases; polymict breccia; regolith; spectra; stony meteorites; trace elements; Vesta Asteroid; X-ray fluorescence spectra ER - TY - JOUR T1 - Search for large presolar silicate grains in the QUE 99177 CR chondrite AN - 1849297603; 2016-104525 JF - Meteoritics & Planetary Science AU - Nguyen, A N AU - Messenger, S AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5357 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - QUE 99177 KW - stony meteorites KW - oxygen KW - AGB stars KW - isotopes KW - condensation KW - supernovas KW - matrix KW - grain size KW - carbonaceous chondrites KW - stable isotopes KW - asymptotic giant branch stars KW - meteorites KW - CR chondrites KW - presolar grains KW - stars KW - Queen Alexandra Range Meteorites KW - O-18 KW - O-17 KW - chondrites KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297603?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Search+for+large+presolar+silicate+grains+in+the+QUE+99177+CR+chondrite&rft.au=Nguyen%2C+A+N%3BMessenger%2C+S%3BAnonymous&rft.aulast=Nguyen&rft.aufirst=A&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5357.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 10 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 19, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - AGB stars; asymptotic giant branch stars; carbonaceous chondrites; chondrites; condensation; CR chondrites; grain size; isotopes; matrix; meteorites; O-17; O-18; oxygen; presolar grains; QUE 99177; Queen Alexandra Range Meteorites; silicates; stable isotopes; stars; stony meteorites; supernovas ER - TY - JOUR T1 - Magnetic properties of Sutter's Mill compared to CM2, C2 and C3 AN - 1849297598; 2016-104344 JF - Meteoritics & Planetary Science AU - Cournede, C AU - Gattacceca, Jerome AU - Rochette, P AU - Elmaleh, Agnes AU - Jenniskens, Petrus AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5146 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - stony meteorites KW - Sutter's Mill Meteorite KW - carbonaceous chondrites KW - metasomatism KW - metamorphism KW - magnetic properties KW - meteorites KW - oxides KW - hydrothermal alteration KW - CM chondrites KW - chondrites KW - sulfides KW - pyrrhotite KW - Eh KW - magnetite KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297598?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Magnetic+properties+of+Sutter%27s+Mill+compared+to+CM2%2C+C2+and+C3&rft.au=Cournede%2C+C%3BGattacceca%2C+Jerome%3BRochette%2C+P%3BElmaleh%2C+Agnes%3BJenniskens%2C+Petrus%3BAnonymous&rft.aulast=Cournede&rft.aufirst=C&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5146.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 1 N1 - PubXState - AR N1 - SuppNotes - Accessed on Nov. 18, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - carbonaceous chondrites; chondrites; CM chondrites; Eh; hydrothermal alteration; magnetic properties; magnetite; metamorphism; metasomatism; meteorites; oxides; pyrrhotite; stony meteorites; sulfides; Sutter's Mill Meteorite ER - TY - JOUR T1 - Wuestite in the fusion crust of the MS-166 Almahata Sitta metal-sulfide assemblage AN - 1849297499; 2016-104428 JF - Meteoritics & Planetary Science AU - Horstmann, Marian AU - Humayun, Munir AU - Harries, Dennis AU - Langenhorst, F AU - Chabot, Nancy L AU - Bischoff, A AU - Zolensky, M E AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5324 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - stony meteorites KW - asteroids KW - atmospheric entry KW - parent bodies KW - differentiation KW - siderophile elements KW - ureilite KW - intergrowths KW - achondrites KW - melts KW - meteorites KW - iron sulfides KW - metals KW - inclusions KW - nickel KW - oxides KW - fusion KW - Almahata Sitta Meteorite KW - wustite KW - sulfides KW - zoning KW - troilite KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297499?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Wuestite+in+the+fusion+crust+of+the+MS-166+Almahata+Sitta+metal-sulfide+assemblage&rft.au=Horstmann%2C+Marian%3BHumayun%2C+Munir%3BHarries%2C+Dennis%3BLangenhorst%2C+F%3BChabot%2C+Nancy+L%3BBischoff%2C+A%3BZolensky%2C+M+E%3BAnonymous&rft.aulast=Horstmann&rft.aufirst=Marian&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5324.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 5 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 15, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - achondrites; Almahata Sitta Meteorite; asteroids; atmospheric entry; differentiation; fusion; inclusions; intergrowths; iron sulfides; melts; metals; meteorites; nickel; oxides; parent bodies; siderophile elements; stony meteorites; sulfides; troilite; ureilite; wustite; zoning ER - TY - JOUR T1 - In the pursuit of regolithic howardites AN - 1849297473; 2016-104328 JF - Meteoritics & Planetary Science AU - Cartwright, Julia A AU - Ott, U AU - Mittlefehldt, D W AU - Herrin, J S AU - Mertzman, K R AU - Mertzman, S A AU - Peng, Z X AU - Quinn, J E AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5057 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - stony meteorites KW - isotopes KW - Lewis Cliff Meteorites KW - isotope ratios KW - HED meteorites KW - Elephant Moraine Meteorites KW - Ne-22/Ne-20 KW - GRO 95535 KW - achondrites KW - stable isotopes KW - PRA 04401 KW - meteorites KW - LEW 85313 KW - GRO 95602 KW - howardite KW - noble gases KW - neon KW - Mount Pratt Meteorites KW - eucrite KW - EET 87518 KW - regolith KW - Grosvenor Mountains Meteorites KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297473?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=In+the+pursuit+of+regolithic+howardites&rft.au=Cartwright%2C+Julia+A%3BOtt%2C+U%3BMittlefehldt%2C+D+W%3BHerrin%2C+J+S%3BMertzman%2C+K+R%3BMertzman%2C+S+A%3BPeng%2C+Z+X%3BQuinn%2C+J+E%3BAnonymous&rft.aulast=Cartwright&rft.aufirst=Julia&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5057.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Nov. 12, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; EET 87518; Elephant Moraine Meteorites; eucrite; GRO 95535; GRO 95602; Grosvenor Mountains Meteorites; HED meteorites; howardite; isotope ratios; isotopes; LEW 85313; Lewis Cliff Meteorites; meteorites; Mount Pratt Meteorites; Ne-22/Ne-20; neon; noble gases; PRA 04401; regolith; stable isotopes; stony meteorites ER - TY - JOUR T1 - Recovery of the Sutter's Mill Meteorite AN - 1849297440; 2016-104447 JF - Meteoritics & Planetary Science AU - Jenniskens, Petrus AU - Girten, B AU - Sears, D AU - Sandford, S AU - Cooper, George AU - Ehrgott, A AU - Koop, M AU - Albers, J AU - Fries, M AU - Klotz, D AU - Hankey, M AU - Schmidt, G AU - Worden, P AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5376 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - United States KW - strewn fields KW - stony meteorites KW - orbits KW - video methods KW - trajectories KW - Sutter's Mill Meteorite KW - carbonaceous chondrites KW - recovery KW - photography KW - meteorite falls KW - California KW - meteorites KW - fragments KW - fireballs KW - reconstruction KW - CM chondrites KW - chondrites KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297440?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Recovery+of+the+Sutter%27s+Mill+Meteorite&rft.au=Jenniskens%2C+Petrus%3BGirten%2C+B%3BSears%2C+D%3BSandford%2C+S%3BCooper%2C+George%3BEhrgott%2C+A%3BKoop%2C+M%3BAlbers%2C+J%3BFries%2C+M%3BKlotz%2C+D%3BHankey%2C+M%3BSchmidt%2C+G%3BWorden%2C+P%3BAnonymous&rft.aulast=Jenniskens&rft.aufirst=Petrus&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5376.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 1 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 23, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - California; carbonaceous chondrites; chondrites; CM chondrites; fireballs; fragments; meteorite falls; meteorites; orbits; photography; reconstruction; recovery; stony meteorites; strewn fields; Sutter's Mill Meteorite; trajectories; United States; video methods ER - TY - JOUR T1 - Amoeboid olivine aggregates in NWA 1152; connection to CR chondrites and the cometary particle T112 AN - 1849297422; 2016-104462 JF - Meteoritics & Planetary Science AU - Komatsu, M AU - Fagan, T J AU - Mikouchi, T AU - Zolensky, M E AU - Miyamoto, M AU - Ohsumi, K AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5153 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - Northwest Africa Meteorites KW - NWA 1152 KW - stony meteorites KW - chromite KW - olivine group KW - carbonaceous chondrites KW - manganese KW - forsterite KW - nesosilicates KW - aqueous alteration KW - meteorites KW - CR chondrites KW - comets KW - metals KW - orthosilicates KW - amoeboid olivine aggregates KW - Wild 2 Comet KW - oxides KW - chondrites KW - cometary dust KW - 05B:Petrology of meteorites and tektites KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297422?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Amoeboid+olivine+aggregates+in+NWA+1152%3B+connection+to+CR+chondrites+and+the+cometary+particle+T112&rft.au=Komatsu%2C+M%3BFagan%2C+T+J%3BMikouchi%2C+T%3BZolensky%2C+M+E%3BMiyamoto%2C+M%3BOhsumi%2C+K%3BAnonymous&rft.aulast=Komatsu&rft.aufirst=M&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5153.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 8 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 29, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - amoeboid olivine aggregates; aqueous alteration; carbonaceous chondrites; chondrites; chromite; cometary dust; comets; CR chondrites; forsterite; manganese; metals; meteorites; nesosilicates; Northwest Africa Meteorites; NWA 1152; olivine group; orthosilicates; oxides; silicates; stony meteorites; Wild 2 Comet ER - TY - JOUR T1 - Mineralogy and oxygen isotope compositions of an unusual hibonite-perovskite refractory inclusion from Allende AN - 1849297411; 2016-104454 JF - Meteoritics & Planetary Science AU - Keller, Lindsay P AU - Snead, C AU - Rahman, Z AU - McKeegan, K D AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5313 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - alteration KW - stony meteorites KW - oxygen KW - isotopes KW - refractory materials KW - calcium-aluminum inclusions KW - perovskite KW - CV chondrites KW - stable isotopes KW - electron probe data KW - Allende Meteorite KW - meteorites KW - mineral composition KW - inclusions KW - composition KW - oxides KW - chondrites KW - O-17/O-16 KW - isotope ratios KW - electron microscopy data KW - O-18/O-16 KW - hibonite KW - carbonaceous chondrites KW - TEM data KW - exsolution KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297411?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Mineralogy+and+oxygen+isotope+compositions+of+an+unusual+hibonite-perovskite+refractory+inclusion+from+Allende&rft.au=Keller%2C+Lindsay+P%3BSnead%2C+C%3BRahman%2C+Z%3BMcKeegan%2C+K+D%3BAnonymous&rft.aulast=Keller&rft.aufirst=Lindsay&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5313.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 3 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 28, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - Allende Meteorite; alteration; calcium-aluminum inclusions; carbonaceous chondrites; chondrites; composition; CV chondrites; electron microscopy data; electron probe data; exsolution; hibonite; inclusions; isotope ratios; isotopes; meteorites; mineral composition; O-17/O-16; O-18/O-16; oxides; oxygen; perovskite; refractory materials; stable isotopes; stony meteorites; TEM data ER - TY - JOUR T1 - In situ mapping of the organic matter in carbonaceous chondrites and mineral relationships AN - 1849297404; 2016-104337 JF - Meteoritics & Planetary Science AU - Clemett, Simon J AU - Messenger, S AU - Thomas-Keprta, K L AU - Gibson, E K, Jr AU - Ross, D K AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5330 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - methods KW - stony meteorites KW - laser methods KW - in situ KW - Vigarano Meteorite KW - Tagish Lake Meteorite KW - carbonaceous chondrites KW - CV chondrites KW - Murchison Meteorite KW - two-step desorption photoionization mass spectroscopy KW - aqueous alteration KW - meteorites KW - organic compounds KW - fine-grained materials KW - sheet silicates KW - CM chondrites KW - chondrites KW - Bells Meteorite KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297404?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=In+situ+mapping+of+the+organic+matter+in+carbonaceous+chondrites+and+mineral+relationships&rft.au=Clemett%2C+Simon+J%3BMessenger%2C+S%3BThomas-Keprta%2C+K+L%3BGibson%2C+E+K%2C+Jr%3BRoss%2C+D+K%3BAnonymous&rft.aulast=Clemett&rft.aufirst=Simon&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5330.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 6 N1 - PubXState - AR N1 - SuppNotes - Accessed on Nov. 17, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - aqueous alteration; Bells Meteorite; carbonaceous chondrites; chondrites; CM chondrites; CV chondrites; fine-grained materials; in situ; laser methods; meteorites; methods; Murchison Meteorite; organic compounds; sheet silicates; silicates; stony meteorites; Tagish Lake Meteorite; two-step desorption photoionization mass spectroscopy; Vigarano Meteorite ER - TY - JOUR T1 - Mars sample return; the next step required to revolutionize knowledge of Martian geological and climatological history AN - 1849297352; 2016-104508 JF - Meteoritics & Planetary Science AU - Mittlefehldt, David W AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5336 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - Meridiani Planum KW - alteration KW - experimental studies KW - ion probe data KW - sample return KW - mass spectra KW - Mars KW - paleoclimatology KW - Gale Crater KW - terrestrial planets KW - paragenesis KW - planets KW - laboratory studies KW - mineral composition KW - paleotemperature KW - spectra KW - chemical composition KW - rocks KW - instruments KW - climate KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297352?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Mars+sample+return%3B+the+next+step+required+to+revolutionize+knowledge+of+Martian+geological+and+climatological+history&rft.au=Mittlefehldt%2C+David+W%3BAnonymous&rft.aulast=Mittlefehldt&rft.aufirst=David&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5336.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 12, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - alteration; chemical composition; climate; experimental studies; Gale Crater; instruments; ion probe data; laboratory studies; Mars; mass spectra; Meridiani Planum; mineral composition; paleoclimatology; paleotemperature; paragenesis; planets; rocks; sample return; spectra; terrestrial planets ER - TY - JOUR T1 - Geologic structures in crater walls on Vesta AN - 1849297314; 2016-104509 JF - Meteoritics & Planetary Science AU - Mittlefehldt, David W AU - Beck, A W AU - Ammannito, Eleonora AU - Carsenty, Uri AU - De Sanctis, Maria Cristina AU - Le Corre, L AU - McCoy, T J AU - Reddy, V AU - Schroeder, S E AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5340 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - albedo KW - stony meteorites KW - impact features KW - asteroids KW - Rheasilvia Basin KW - optical spectra KW - Dawn Mission KW - infrared spectra KW - meteorites KW - pyroxene group KW - mixing KW - spectra KW - chondrites KW - chain silicates KW - Vesta Asteroid KW - Visible and Infrared Mapping Spectrometer KW - HED meteorites KW - carbonaceous chondrites KW - achondrites KW - Framing Camera KW - craters KW - impact craters KW - Marcia Crater KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297314?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Geologic+structures+in+crater+walls+on+Vesta&rft.au=Mittlefehldt%2C+David+W%3BBeck%2C+A+W%3BAmmannito%2C+Eleonora%3BCarsenty%2C+Uri%3BDe+Sanctis%2C+Maria+Cristina%3BLe+Corre%2C+L%3BMcCoy%2C+T+J%3BReddy%2C+V%3BSchroeder%2C+S+E%3BAnonymous&rft.aulast=Mittlefehldt&rft.aufirst=David&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5340.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 8 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 12, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; albedo; asteroids; carbonaceous chondrites; chain silicates; chondrites; craters; Dawn Mission; Framing Camera; HED meteorites; impact craters; impact features; infrared spectra; Marcia Crater; meteorites; mixing; optical spectra; pyroxene group; Rheasilvia Basin; silicates; spectra; stony meteorites; Vesta Asteroid; Visible and Infrared Mapping Spectrometer ER - TY - JOUR T1 - Forward modeling of ejecta curtains from oblique impacts; experiments and comparison to real events AN - 1849297224; 2016-104413 JF - Meteoritics & Planetary Science AU - Hermalyn, B AU - Schultz, P H AU - Kleyna, J AU - Meech, K J AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5307 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - cratering KW - experimental studies KW - patterns KW - three-dimensional models KW - impacts KW - ejecta KW - models KW - planets KW - scale models KW - oblique orientation KW - dynamics KW - velocity KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297224?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Forward+modeling+of+ejecta+curtains+from+oblique+impacts%3B+experiments+and+comparison+to+real+events&rft.au=Hermalyn%2C+B%3BSchultz%2C+P+H%3BKleyna%2C+J%3BMeech%2C+K+J%3BAnonymous&rft.aulast=Hermalyn&rft.aufirst=B&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5307.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 6 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 10, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - cratering; dynamics; ejecta; experimental studies; impacts; models; oblique orientation; patterns; planets; scale models; three-dimensional models; velocity ER - TY - JOUR T1 - A model of oxygen isotopic fractionation in the proto-solar nebula due to nebular lightning AN - 1849297221; 2016-104544 JF - Meteoritics & Planetary Science AU - Paquette, J A AU - Nuth, J A AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5079 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - isotope fractionation KW - oxygen KW - isotopes KW - condensation KW - supernovas KW - cosmochemistry KW - stable isotopes KW - solar nebula KW - models KW - lightning KW - evaporation KW - cosmic dust KW - stars KW - heating KW - O-16 KW - electrical currents KW - 04:Extraterrestrial geology KW - 02D:Isotope geochemistry UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297221?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=A+model+of+oxygen+isotopic+fractionation+in+the+proto-solar+nebula+due+to+nebular+lightning&rft.au=Paquette%2C+J+A%3BNuth%2C+J+A%3BAnonymous&rft.aulast=Paquette&rft.aufirst=J&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5079.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 20, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - condensation; cosmic dust; cosmochemistry; electrical currents; evaporation; heating; isotope fractionation; isotopes; lightning; models; O-16; oxygen; silicates; solar nebula; stable isotopes; stars; supernovas ER - TY - JOUR T1 - Additional Sr isotopic heterogeneity in Zagami olivine-rich lithology AN - 1849297185; 2016-104506 JF - Meteoritics & Planetary Science AU - Misawa, K AU - Niihara, T AU - Shih, C Y AU - Reese, Y D AU - Nyquist, L E AU - Yoneda, S AU - Yamashita, H AU - Hirata, D AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5190 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - silicates KW - alkaline earth metals KW - stony meteorites KW - isotopes KW - Martian meteorites KW - isotope ratios KW - olivine group KW - achondrites KW - stable isotopes KW - SNC Meteorites KW - nesosilicates KW - Sr-87/Sr-86 KW - meteorites KW - shergottite KW - metals KW - magmas KW - olivine KW - Zagami Meteorite KW - orthosilicates KW - petrography KW - heterogeneity KW - strontium KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297185?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Additional+Sr+isotopic+heterogeneity+in+Zagami+olivine-rich+lithology&rft.au=Misawa%2C+K%3BNiihara%2C+T%3BShih%2C+C+Y%3BReese%2C+Y+D%3BNyquist%2C+L+E%3BYoneda%2C+S%3BYamashita%2C+H%3BHirata%2C+D%3BAnonymous&rft.aulast=Misawa&rft.aufirst=K&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5190.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 12, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; alkaline earth metals; heterogeneity; isotope ratios; isotopes; magmas; Martian meteorites; metals; meteorites; nesosilicates; olivine; olivine group; orthosilicates; petrography; shergottite; silicates; SNC Meteorites; Sr-87/Sr-86; stable isotopes; stony meteorites; strontium; Zagami Meteorite ER - TY - JOUR T1 - Nucleobases and other prebiotic species from the UV irradiation of pyrimidine in astrophysical ices AN - 1849297140; 2016-104571 JF - Meteoritics & Planetary Science AU - Sandford, S A AU - Nuevo, M AU - Materese, C K AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5071 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - ammonium KW - irradiation KW - nucleobases KW - prebiotic chemistry KW - aliphatic hydrocarbons KW - simulation KW - temperature KW - urea KW - electromagnetic radiation KW - ice KW - amino acids KW - alcohols KW - pyrimidine KW - water KW - experimental studies KW - methane KW - organic minerals KW - photochemistry KW - interstellar medium KW - cosmochemistry KW - alkanes KW - ultraviolet radiation KW - methanol KW - solar nebula KW - organic compounds KW - organic acids KW - low temperature KW - hydrocarbons KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297140?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Nucleobases+and+other+prebiotic+species+from+the+UV+irradiation+of+pyrimidine+in+astrophysical+ices&rft.au=Sandford%2C+S+A%3BNuevo%2C+M%3BMaterese%2C+C+K%3BAnonymous&rft.aulast=Sandford&rft.aufirst=S&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5071.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 10 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 28, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - alcohols; aliphatic hydrocarbons; alkanes; amino acids; ammonium; cosmochemistry; electromagnetic radiation; experimental studies; hydrocarbons; ice; interstellar medium; irradiation; low temperature; methane; methanol; nucleobases; organic acids; organic compounds; organic minerals; photochemistry; prebiotic chemistry; pyrimidine; simulation; solar nebula; temperature; ultraviolet radiation; urea; water ER - TY - JOUR T1 - Solar ion processing of major element surface compositions of mature mare soils; insights from combined XPS and analytical TEM observations AN - 1849297043; 2016-104335 JF - Meteoritics & Planetary Science AU - Christoffersen, Roy AU - Dukes, C AU - Keller, Lindsay P AU - Baragiola, R AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5341 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - experimental studies KW - irradiation KW - Moon KW - solar wind KW - maria KW - ions KW - weathering KW - space weathering KW - lunar samples KW - major elements KW - Sample 10084 KW - spectra KW - X-ray photoelectron spectra KW - regolith KW - lunar soils KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297043?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Solar+ion+processing+of+major+element+surface+compositions+of+mature+mare+soils%3B+insights+from+combined+XPS+and+analytical+TEM+observations&rft.au=Christoffersen%2C+Roy%3BDukes%2C+C%3BKeller%2C+Lindsay+P%3BBaragiola%2C+R%3BAnonymous&rft.aulast=Christoffersen&rft.aufirst=Roy&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5341.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 4 N1 - PubXState - AR N1 - SuppNotes - Accessed on Nov. 17, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - experimental studies; ions; irradiation; lunar samples; lunar soils; major elements; maria; Moon; regolith; Sample 10084; solar wind; space weathering; spectra; weathering; X-ray photoelectron spectra ER - TY - JOUR T1 - The amino acid composition of the Sutter's Mill carbonaceous chondrite AN - 1849297024; 2016-104387 JF - Meteoritics & Planetary Science AU - Glavin, D P AU - Burton, A S AU - Elsila, J E AU - Dworkin, J P AU - Yin, Q Z AU - Cooper, George AU - Jenniskens, Petrus AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5237 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - United States KW - stony meteorites KW - El Dorado County California KW - thermal alteration KW - parent bodies KW - liquid chromatograms KW - mass spectra KW - Sutter's Mill Meteorite KW - carbonaceous chondrites KW - meteorite falls KW - California KW - aqueous alteration KW - meteorites KW - organic compounds KW - organic acids KW - Coloma California KW - fluorescence KW - chromatograms KW - amino acids KW - derivatization KW - spectra KW - CM chondrites KW - chondrites KW - 05B:Petrology of meteorites and tektites KW - 02C:Geochemistry of rocks, soils, and sediments UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297024?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=The+amino+acid+composition+of+the+Sutter%27s+Mill+carbonaceous+chondrite&rft.au=Glavin%2C+D+P%3BBurton%2C+A+S%3BElsila%2C+J+E%3BDworkin%2C+J+P%3BYin%2C+Q+Z%3BCooper%2C+George%3BJenniskens%2C+Petrus%3BAnonymous&rft.aulast=Glavin&rft.aufirst=D&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5237.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 5 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 2, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - amino acids; aqueous alteration; California; carbonaceous chondrites; chondrites; chromatograms; CM chondrites; Coloma California; derivatization; El Dorado County California; fluorescence; liquid chromatograms; mass spectra; meteorite falls; meteorites; organic acids; organic compounds; parent bodies; spectra; stony meteorites; Sutter's Mill Meteorite; thermal alteration; United States ER - TY - JOUR T1 - Characterization of carbonaceous xenolithic clasts in Sharps (H3.4) meteorite; implications for their origin AN - 1849297020; 2016-104453 JF - Meteoritics & Planetary Science AU - Kebukawa, Y AU - Zolensky, M E AU - Cody, G D AU - Kilcoyne, A L D AU - Rahman, Z AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5085 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - ordinary chondrites KW - stony meteorites KW - temperature KW - XANES spectra KW - meteorites KW - mixing KW - insoluble residues KW - carbon KW - inclusions KW - Sharps Meteorite KW - spectra KW - chondrites KW - xenoliths KW - carbonaceous composition KW - electron microscopy data KW - native elements KW - H chondrites KW - clasts KW - X-ray spectra KW - TEM data KW - early solar system KW - graphite KW - focused ion beam KW - organic compounds KW - high temperature KW - 05B:Petrology of meteorites and tektites UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297020?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Characterization+of+carbonaceous+xenolithic+clasts+in+Sharps+%28H3.4%29+meteorite%3B+implications+for+their+origin&rft.au=Kebukawa%2C+Y%3BZolensky%2C+M+E%3BCody%2C+G+D%3BKilcoyne%2C+A+L+D%3BRahman%2C+Z%3BAnonymous&rft.aulast=Kebukawa&rft.aufirst=Y&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5085.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 3 N1 - PubXState - AR N1 - SuppNotes - Accessed on Dec. 23, 2015 N1 - Last updated - 2016-12-16 N1 - SubjectsTermNotLitGenreText - carbon; carbonaceous composition; chondrites; clasts; early solar system; electron microscopy data; focused ion beam; graphite; H chondrites; high temperature; inclusions; insoluble residues; meteorites; mixing; native elements; ordinary chondrites; organic compounds; Sharps Meteorite; spectra; stony meteorites; TEM data; temperature; X-ray spectra; XANES spectra; xenoliths ER - TY - JOUR T1 - For a few howardites more; GRaND maps the elemental composition of Vesta AN - 1849297011; 2016-104556 JF - Meteoritics & Planetary Science AU - Prettyman, T H AU - Reedy, R C AU - Mittlefehldt, D W AU - Yamashita, N AU - Lawrence, D J AU - Beck, A W AU - Feldman, William C AU - McCoy, T J AU - McSween, H Y AU - Toplis, M J AU - Forni, Olivier AU - Mizzon, H AU - Raymond, C A AU - Russell, C T AU - Polanskey, C A AU - Joy, S P AU - Mafi, J AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5377 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - GRaND KW - gamma-ray methods KW - stony meteorites KW - asteroids KW - Vesta Asteroid KW - detection limit KW - HED meteorites KW - diogenite KW - mapping KW - Dawn Mission KW - achondrites KW - meteorites KW - Gamma Ray and Neutron Detector KW - neutrons KW - howardite KW - mixing KW - eucrite KW - orbital observations KW - chemical composition KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297011?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=For+a+few+howardites+more%3B+GRaND+maps+the+elemental+composition+of+Vesta&rft.au=Prettyman%2C+T+H%3BReedy%2C+R+C%3BMittlefehldt%2C+D+W%3BYamashita%2C+N%3BLawrence%2C+D+J%3BBeck%2C+A+W%3BFeldman%2C+William+C%3BMcCoy%2C+T+J%3BMcSween%2C+H+Y%3BToplis%2C+M+J%3BForni%2C+Olivier%3BMizzon%2C+H%3BRaymond%2C+C+A%3BRussell%2C+C+T%3BPolanskey%2C+C+A%3BJoy%2C+S+P%3BMafi%2C+J%3BAnonymous&rft.aulast=Prettyman&rft.aufirst=T&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5377.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 7 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 27, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - achondrites; asteroids; chemical composition; Dawn Mission; detection limit; diogenite; eucrite; Gamma Ray and Neutron Detector; gamma-ray methods; GRaND; HED meteorites; howardite; mapping; meteorites; mixing; neutrons; orbital observations; stony meteorites; Vesta Asteroid ER - TY - JOUR T1 - Transformation of graphitic and amorphous carbon dust to complex organic molecules in a massive carbon cycle in protostellar nebulae AN - 1849297009; 2016-104531 JF - Meteoritics & Planetary Science AU - Nuth, Joseph A, III AU - Johnson, Natasha M AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5070 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - irradiation KW - amorphous materials KW - aliphatic hydrocarbons KW - cosmochemistry KW - native elements KW - geochemical cycle KW - solar nebula KW - graphite KW - carbon monoxide KW - organic compounds KW - cosmic dust KW - carbon KW - hydrocarbons KW - carbon cycle KW - transformations KW - organic carbon KW - interstellar dust KW - Fischer-Tropsch type reactions KW - aromatic hydrocarbons KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297009?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Transformation+of+graphitic+and+amorphous+carbon+dust+to+complex+organic+molecules+in+a+massive+carbon+cycle+in+protostellar+nebulae&rft.au=Nuth%2C+Joseph+A%2C+III%3BJohnson%2C+Natasha+M%3BAnonymous&rft.aulast=Nuth&rft.aufirst=Joseph&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5070.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 8 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 19, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - aliphatic hydrocarbons; amorphous materials; aromatic hydrocarbons; carbon; carbon cycle; carbon monoxide; cosmic dust; cosmochemistry; Fischer-Tropsch type reactions; geochemical cycle; graphite; hydrocarbons; interstellar dust; irradiation; native elements; organic carbon; organic compounds; solar nebula; transformations ER - TY - JOUR T1 - Some anticipated science results from "local" Martian sampling site(s) AN - 1849297001; 2016-104532 JF - Meteoritics & Planetary Science AU - Nyquist, Laurence E AU - Rao, M N AU - Shih, C Y AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5262 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - sulfates KW - isotopes KW - igneous rocks KW - sample return KW - astrobiology KW - Mars KW - Hesperian KW - biomarkers KW - weathering KW - stable isotopes KW - terrestrial planets KW - planets KW - sedimentary rocks KW - S-34/S-32 KW - sampling KW - planning KW - iron sulfides KW - age KW - sulfur KW - sulfides KW - regolith KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849297001?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=Some+anticipated+science+results+from+%22local%22+Martian+sampling+site%28s%29&rft.au=Nyquist%2C+Laurence+E%3BRao%2C+M+N%3BShih%2C+C+Y%3BAnonymous&rft.aulast=Nyquist&rft.aufirst=Laurence&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5262.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 9 N1 - PubXState - AR N1 - SuppNotes - Accessed on Jan. 19, 2016 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - age; astrobiology; biomarkers; Hesperian; igneous rocks; iron sulfides; isotopes; Mars; planets; planning; regolith; S-34/S-32; sample return; sampling; sedimentary rocks; stable isotopes; sulfates; sulfides; sulfur; terrestrial planets; weathering ER - TY - JOUR T1 - The thermodynamic properties of cubanite AN - 1849296993; 2016-104300 JF - Meteoritics & Planetary Science AU - Berger, Eve L AU - Lauretta, D S AU - Keller, Lindsay P AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5008 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - CI chondrites KW - stony meteorites KW - crystal systems KW - entropy KW - stability KW - heat capacity KW - free energy KW - carbonaceous chondrites KW - cubanite KW - orthorhombic system KW - chalcopyrite KW - temperature KW - meteorites KW - polymorphism KW - exsolution KW - transformations KW - thermodynamic properties KW - chondrites KW - sulfides KW - pyrrhotite KW - cubic system KW - 05B:Petrology of meteorites and tektites KW - 01C:Mineralogy of non-silicates UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849296993?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=The+thermodynamic+properties+of+cubanite&rft.au=Berger%2C+Eve+L%3BLauretta%2C+D+S%3BKeller%2C+Lindsay+P%3BAnonymous&rft.aulast=Berger&rft.aufirst=Eve&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5008.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - Number of references - 6 N1 - PubXState - AR N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Accessed on Oct. 29, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - carbonaceous chondrites; chalcopyrite; chondrites; CI chondrites; crystal systems; cubanite; cubic system; entropy; exsolution; free energy; heat capacity; meteorites; orthorhombic system; polymorphism; pyrrhotite; stability; stony meteorites; sulfides; temperature; thermodynamic properties; transformations ER - TY - JOUR T1 - The importance of MSR as a precursor to the future human exploration of Mars AN - 1849296888; 2016-104289 JF - Meteoritics & Planetary Science AU - Bass, Deborah S AU - Beaty, David W AU - Carr, M H AU - Drake, B G AU - Hoffman, S J AU - Anonymous Y1 - 2012/07// PY - 2012 DA - July 2012 EP - Abstract no. 5400 PB - Meteoritical Society, Fayetteville, AR VL - 47, Suppl. SN - 1086-9379, 1086-9379 KW - clastic sediments KW - sample return KW - astrobiology KW - Mars KW - exploration KW - terrestrial planets KW - planets KW - safety KW - toxicity KW - future KW - dust KW - sediments KW - human exploration KW - uncertainty KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1849296888?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Meteoritics+%26+Planetary+Science&rft.atitle=The+importance+of+MSR+as+a+precursor+to+the+future+human+exploration+of+Mars&rft.au=Bass%2C+Deborah+S%3BBeaty%2C+David+W%3BCarr%2C+M+H%3BDrake%2C+B+G%3BHoffman%2C+S+J%3BAnonymous&rft.aulast=Bass&rft.aufirst=Deborah&rft.date=2012-07-01&rft.volume=47%2C+Suppl.&rft.issue=&rft.spage=&rft.isbn=&rft.btitle=&rft.title=Meteoritics+%26+Planetary+Science&rft.issn=10869379&rft_id=info:doi/ L2 - www.lpi.usra.edu/meetings/metsoc2012/pdf/5400.pdf http://cavern.uark.edu/~meteor/ LA - English DB - GeoRef N1 - Conference title - 75th annual meeting of the Meteorological Society N1 - Copyright - GeoRef, Copyright 2016, American Geosciences Institute. N1 - Date revised - 2016-01-01 N1 - PubXState - AR N1 - SuppNotes - Accessed on Oct. 22, 2015 N1 - Last updated - 2016-12-16 N1 - CODEN - MERTAW N1 - SubjectsTermNotLitGenreText - astrobiology; clastic sediments; dust; exploration; future; human exploration; Mars; planets; safety; sample return; sediments; terrestrial planets; toxicity; uncertainty ER - TY - JOUR T1 - Uncertainty Estimate of Surface Irradiances Computed with MODIS-, CALIPSO-, and CloudSat-Derived Cloud and Aerosol Properties AN - 1832647617; 783931-7 AB - Differences of modeled surface upward and downward longwave and shortwave irradiances are calculated using modeled irradiance computed with active sensor-derived and passive sensor-derived cloud and aerosol properties. The irradiance differences are calculated for various temporal and spatial scales, monthly gridded, monthly zonal, monthly global, and annual global. Using the irradiance differences, the uncertainty of surface irradiances is estimated. The uncertainty (1sigma ) of the annual global surface downward longwave and shortwave is, respectively, 7 W m (super -2) (out of 345 W m (super -2) ) and 4 W m (super -2) (out of 192 W m (super -2) ), after known bias errors are removed. Similarly, the uncertainty of the annual global surface upward longwave and shortwave is, respectively, 3 W m (super -2) (out of 398 W m (super -2) ) and 3 W m (super -2) (out of 23 W m (super -2) ). The uncertainty is for modeled irradiances computed using cloud properties derived from imagers on a sun-synchronous orbit that covers the globe every day (e.g., moderate-resolution imaging spectrometer) or modeled irradiances computed for nadir view only active sensors on a sun-synchronous orbit such as Cloud-Aerosol Lidar and Infrared Pathfinder Satellite Observation and CloudSat. If we assume that longwave and shortwave uncertainties are independent of each other, but up- and downward components are correlated with each other, the uncertainty in global annual mean net surface irradiance is 12 W m (super -2) . One-sigma uncertainty bounds of the satellite-based net surface irradiance are 106 W m (super -2) and 130 W m (super -2) . Copyright 2012 Springer Science+Business Media B.V. and The Author(s) JF - Surveys in Geophysics AU - Kato, Seiji AU - Loeb, Norman G AU - Rutan, David A AU - Rose, Fred G AU - Sun-Mack, Sunny AU - Miller, Walter F AU - Chen, Yan Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 395 EP - 412 PB - Springer, Dordrecht VL - 33 IS - 3-4 SN - 0169-3298, 0169-3298 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832647617?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Surveys+in+Geophysics&rft.atitle=Uncertainty+Estimate+of+Surface+Irradiances+Computed+with+MODIS-%2C+CALIPSO-%2C+and+CloudSat-Derived+Cloud+and+Aerosol+Properties&rft.au=Kato%2C+Seiji%3BLoeb%2C+Norman+G%3BRutan%2C+David+A%3BRose%2C+Fred+G%3BSun-Mack%2C+Sunny%3BMiller%2C+Walter+F%3BChen%2C+Yan&rft.aulast=Kato&rft.aufirst=Seiji&rft.date=2012-07-01&rft.volume=33&rft.issue=3-4&rft.spage=395&rft.isbn=&rft.btitle=&rft.title=Surveys+in+Geophysics&rft.issn=01693298&rft_id=info:doi/10.1007%2Fs10712-012-9179-x L2 - http://www.springerlink.com/(xfpu0bn4myxx3njya4gn4s55)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:103000,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 N1 - CODEN - GPSVAK DO - http://dx.doi.org/10.1007/s10712-012-9179-x ER - TY - JOUR T1 - The Role of Clouds: An Introduction and Rapporteur Report AN - 1832647606; 783931-19 AB - This paper presents an overview of discussions during the Cloud's Role session at the Observing and Modelling Earth's Energy Flows Workshop. N. Loeb and B. Soden convened this session including 10 presentations by B. Stevens, B. Wielicki, G. Stephens, A. Clement, K. Sassen, D. Hartmann, T. Andrews, A. Del Genio, H. Barker, and M. Sugi addressing critical aspects of the role of clouds in modulating Earth energy flows. Presentation topics covered a diverse range of areas from cloud microphysics and dynamics, cloud radiative transfer, and the role of clouds in large-scale atmospheric circulations patterns in both observations and atmospheric models. The presentations and discussions, summarized below, are organized around several key questions raised during the session. (1) What is the best way to evaluate clouds in climate models? (2) How well do models need to represent clouds to be acceptable for making climate predictions? (3) What are the largest uncertainties in clouds? (4) How can these uncertainties be reduced? (5) What new observations are needed to address these problems? Answers to these critical questions are the topics of ongoing research and will guide the future direction of this area of research. Copyright 2012 Springer Science+Business Media B.V. and The Author(s) JF - Surveys in Geophysics AU - Taylor, Patrick C Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 609 EP - 617 PB - Springer, Dordrecht VL - 33 IS - 3-4 SN - 0169-3298, 0169-3298 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832647606?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Surveys+in+Geophysics&rft.atitle=The+Role+of+Clouds%3A+An+Introduction+and+Rapporteur+Report&rft.au=Taylor%2C+Patrick+C&rft.aulast=Taylor&rft.aufirst=Patrick&rft.date=2012-07-01&rft.volume=33&rft.issue=3-4&rft.spage=609&rft.isbn=&rft.btitle=&rft.title=Surveys+in+Geophysics&rft.issn=01693298&rft_id=info:doi/10.1007%2Fs10712-012-9182-2 L2 - http://www.springerlink.com/(xfpu0bn4myxx3njya4gn4s55)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:103000,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 N1 - CODEN - GPSVAK DO - http://dx.doi.org/10.1007/s10712-012-9182-2 ER - TY - JOUR T1 - Advances in Understanding Top-of-Atmosphere Radiation Variability from Satellite Observations AN - 1832621074; 783931-5 AB - This paper highlights how the emerging record of satellite observations from the Earth Observation System (EOS) and A-Train constellation are advancing our ability to more completely document and understand the underlying processes associated with variations in the Earth's top-of-atmosphere (TOA) radiation budget. Large-scale TOA radiation changes during the past decade are observed to be within 0.5 Wm (super -2) per decade based upon comparisons between Clouds and the Earth's Radiant Energy System (CERES) instruments aboard Terra and Aqua and other instruments. Tropical variations in emitted outgoing longwave (LW) radiation are found to closely track changes in the El Nino-Southern Oscillation (ENSO). During positive ENSO phase (El Nino), outgoing LW radiation increases, and decreases during the negative ENSO phase (La Nina). The coldest year during the last decade occurred in 2008, during which strong La Nina conditions persisted throughout most of the year. Atmospheric Infrared Sounder (AIRS) observations show that the lower temperatures extended throughout much of the troposphere for several months, resulting in a reduction in outgoing LW radiation and an increase in net incoming radiation. At the global scale, outgoing LW flux anomalies are partially compensated for by decreases in midlatitude cloud fraction and cloud height, as observed by Moderate Resolution Imaging Spectrometer and Multi-angle Imaging SpectroRadiometer, respectively. CERES data show that clouds have a net radiative warming influence during La Nina conditions and a net cooling influence during El Nino, but the magnitude of the anomalies varies greatly from one ENSO event to another. Regional cloud-radiation variations among several Terra and A-Train instruments show consistent patterns and exhibit marked fluctuations at monthly timescales in response to tropical atmosphere-ocean dynamical processes associated with ENSO and Madden-Julian Oscillation. Copyright 2012 Springer Science+Business Media B.V. and The Author(s) JF - Surveys in Geophysics AU - Loeb, Norman G AU - Kato, Seiji AU - Su, Wenying AU - Wong, Takmeng AU - Rose, Fred G AU - Doelling, David R AU - Norris, Joel R AU - Huang, Xianglei Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 359 EP - 385 PB - Springer, Dordrecht VL - 33 IS - 3-4 SN - 0169-3298, 0169-3298 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832621074?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Surveys+in+Geophysics&rft.atitle=Advances+in+Understanding+Top-of-Atmosphere+Radiation+Variability+from+Satellite+Observations&rft.au=Loeb%2C+Norman+G%3BKato%2C+Seiji%3BSu%2C+Wenying%3BWong%2C+Takmeng%3BRose%2C+Fred+G%3BDoelling%2C+David+R%3BNorris%2C+Joel+R%3BHuang%2C+Xianglei&rft.aulast=Loeb&rft.aufirst=Norman&rft.date=2012-07-01&rft.volume=33&rft.issue=3-4&rft.spage=359&rft.isbn=&rft.btitle=&rft.title=Surveys+in+Geophysics&rft.issn=01693298&rft_id=info:doi/10.1007%2Fs10712-012-9175-1 L2 - http://www.springerlink.com/(xfpu0bn4myxx3njya4gn4s55)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:103000,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 N1 - CODEN - GPSVAK DO - http://dx.doi.org/10.1007/s10712-012-9175-1 ER - TY - JOUR T1 - Computation of Solar Radiative Fluxes by 1D and 3D Methods Using Cloudy Atmospheres Inferred from A-train Satellite Data AN - 1832620690; 783931-22 AB - This study used realistic representations of cloudy atmospheres to assess errors in solar flux estimates associated with 1D radiative transfer models. A scene construction algorithm, developed for the EarthCARE mission, was applied to CloudSat, CALIPSO and MODIS satellite data thus producing 3D cloudy atmospheres measuring 61 km wide by 14,000 km long at 1 km grid-spacing. Broadband solar fluxes and radiances were then computed by a Monte Carlo photon transfer model run in both full 3D and 1D independent column approximation modes. Results were averaged into 1,303 (50 km) (super 2) domains. For domains with total cloud fractions A (sub c ) 0.7 and characterized by small bias yet large random errors. Regardless of A (sub c ) , differences between 3D and 1D transfer rarely exceed + or -30 W m (super -2) for net TOA and surface fluxes and + or -10 W m (super -2) for atmospheric absorption. Horizontal fluxes through domain sides depend on A (sub c ) with approximately 20% of cases exceeding + or -30 W m (super -2) ; the largest values occur for A (sub c ) > 0.7. Conversely, heating rate differences rarely exceed + or -20%. As a cursory test of TOA radiative closure, fluxes produced by the 3D model were averaged up to (20 km) (super 2) and compared to values measured by CERES. While relatively little attention was paid to optical properties of ice crystals and surfaces, and aerosols were neglected entirely, approximately 30% of the differences between 3D model estimates and measurements fall within + or -10 W m (super -2) ; this is the target agreement set for EarthCARE. This, coupled with the aforementioned comparison between 3D and 1D transfer, leads to the recommendation that EarthCARE employ a 3D transport model when attempting TOA radiative closure. Copyright 2012 Springer Science+Business Media B.V. and 2011 The Author(s) JF - Surveys in Geophysics AU - Barker, H W AU - Kato, S AU - Wehr, T Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 657 EP - 676 PB - Springer, Dordrecht VL - 33 IS - 3-4 SN - 0169-3298, 0169-3298 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832620690?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Surveys+in+Geophysics&rft.atitle=Computation+of+Solar+Radiative+Fluxes+by+1D+and+3D+Methods+Using+Cloudy+Atmospheres+Inferred+from+A-train+Satellite+Data&rft.au=Barker%2C+H+W%3BKato%2C+S%3BWehr%2C+T&rft.aulast=Barker&rft.aufirst=H&rft.date=2012-07-01&rft.volume=33&rft.issue=3-4&rft.spage=657&rft.isbn=&rft.btitle=&rft.title=Surveys+in+Geophysics&rft.issn=01693298&rft_id=info:doi/10.1007%2Fs10712-011-9164-9 L2 - http://www.springerlink.com/(xfpu0bn4myxx3njya4gn4s55)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:103000,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 N1 - CODEN - GPSVAK DO - http://dx.doi.org/10.1007/s10712-011-9164-9 ER - TY - JOUR T1 - Reducing the Uncertainties in Direct Aerosol Radiative Forcing AN - 1832620494; 783931-25 AB - Direct aerosol radiative forcing (DARF) remains a leading contributor to climate prediction uncertainty. To monitor the spatially and temporally varying global atmospheric aerosol load, satellite remote sensing is required. Despite major advances in observing aerosol amount, type, and distribution from space, satellite data alone cannot provide enough quantitative detail, especially about aerosol microphysical properties, to effect the required improvement in estimates of DARF and the anthropogenic component of DARF. However, the combination of space-based and targeted suborbital measurements, when used to constrain climate models, represents an achievable next step likely to provide the needed advancement. Copyright 2012 Springer Science+Business Media B.V. and 2011 The Author(s) JF - Surveys in Geophysics AU - Kahn, Ralph A Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 701 EP - 721 PB - Springer, Dordrecht VL - 33 IS - 3-4 SN - 0169-3298, 0169-3298 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832620494?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Surveys+in+Geophysics&rft.atitle=Reducing+the+Uncertainties+in+Direct+Aerosol+Radiative+Forcing&rft.au=Kahn%2C+Ralph+A&rft.aulast=Kahn&rft.aufirst=Ralph&rft.date=2012-07-01&rft.volume=33&rft.issue=3-4&rft.spage=701&rft.isbn=&rft.btitle=&rft.title=Surveys+in+Geophysics&rft.issn=01693298&rft_id=info:doi/10.1007%2Fs10712-011-9153-z L2 - http://www.springerlink.com/(xfpu0bn4myxx3njya4gn4s55)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:103000,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 N1 - CODEN - GPSVAK DO - http://dx.doi.org/10.1007/s10712-011-9153-z ER - TY - JOUR T1 - Representing the Sensitivity of Convective Cloud Systems to Tropospheric Humidity in General Circulation Models AN - 1832620354; 783931-21 AB - Convective cloud variability on many times scales can be viewed as having three major components: a suppressed phase of shallow and congestus clouds, a disturbed phase of deep convective clouds, and a mature phase of transition to stratiform upper-level clouds. Cumulus parameterization development has focused primarily on the second phase until recently. Consequently, many parameterizations are not sufficiently sensitive to variations in tropospheric humidity. This shortcoming may affect global climate model simulations of climate sensitivity to external forcings, the continental diurnal cycle of clouds and precipitation, and intraseasonal precipitation variability. The lack of sensitivity can be traced in part to underestimated entrainment of environmental air into rising convective clouds and insufficient evaporation of rain into the environment. As a result, the parameterizations produce deep convection too easily while stabilizing the environment too quickly to allow the effects of convective mesoscale organization to occur. Recent versions of some models have increased their sensitivity to tropospheric humidity and improved some aspects of their variability, but a parameterization of mesoscale organization is still absent from most models. Evidence about the effect of these uncertainties on climate change projections suggests that climate modelers should make improved simulation of high and convective clouds as high a priority as better representations of low clouds. Copyright 2012 Springer Science+Business Media B.V. and 2011 The Author(s) JF - Surveys in Geophysics AU - Del Genio, Anthony D Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 637 EP - 656 PB - Springer, Dordrecht VL - 33 IS - 3-4 SN - 0169-3298, 0169-3298 UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1832620354?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefinprocess&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Surveys+in+Geophysics&rft.atitle=Representing+the+Sensitivity+of+Convective+Cloud+Systems+to+Tropospheric+Humidity+in+General+Circulation+Models&rft.au=Del+Genio%2C+Anthony+D&rft.aulast=Del+Genio&rft.aufirst=Anthony&rft.date=2012-07-01&rft.volume=33&rft.issue=3-4&rft.spage=637&rft.isbn=&rft.btitle=&rft.title=Surveys+in+Geophysics&rft.issn=01693298&rft_id=info:doi/10.1007%2Fs10712-011-9148-9 L2 - http://www.springerlink.com/(xfpu0bn4myxx3njya4gn4s55)/app/home/journal.asp?referrer=parent&backto=linkingpublicationresults,1:103000,1 LA - English DB - GeoRef N1 - Copyright - GeoRef in Process, Copyright 2017, American Geosciences Institute. After editing and indexing, this record will be added to Georef. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Last updated - 2017-01-24 N1 - CODEN - GPSVAK DO - http://dx.doi.org/10.1007/s10712-011-9148-9 ER - TY - JOUR T1 - Dust radiative forcing in snow of the Upper Colorado River Basin: 2. Interannual variability in radiative forcing and snowmelt rates AN - 1566844815; 20688596 AB - Here we present the radiative and snowmelt impacts of dust deposition to snow cover using a 6-year energy balance record (2005-2010) at alpine and subalpine micrometeorological towers in the Senator Beck Basin Study Area (SBBSA) in southwestern Colorado, USA. These results follow from the measurements described in part I. We simulate the evolution of snow water equivalent at each station under scenarios of observed and dust-free conditions, and +2 degree C and +4 degree C melt-season temperature perturbations to these scenarios. Over the 6 years of record, daily mean dust radiative forcing ranged from 0 to 214 W m super(-2), with hourly peaks up to 409 W m super(-2). Mean springtime dust radiative forcings across the period ranged from 31 to 49 W m super(-2) at the alpine site and 45 to 75 W m super(-2) at the subalpine site, in turn shortening snow cover duration by 21 to 51 days. The dust-advanced loss of snow cover (days) is linearly related to total dust concentration at the end of snow cover, despite temporal variability in dust exposure and solar irradiance. Under clean snow conditions, the temperature increases shorten snow cover by 5-18 days, whereas in the presence of dust they only shorten snow duration by 0-6 days. Dust radiative forcing also causes faster and earlier peak snowmelt outflow with daily mean snowpack outflow doubling under the heaviest dust conditions. On average, snow cover at the towers is lost 2.5 days after peak outflow in dusty conditions, and 1-2 weeks after peak outflow in clean conditions. Key Points * Dust in snow in the Colorado River Basin absorbs extra 31 to 75 W m-2 in spring * This dust radiative forcing shortens snow cover duration by 21 to 51 days * Melt season temperature increases of 2 to 4 deg C shorten snow cover 5-18 days JF - Water Resources Research AU - Skiles, SMcKenzie AU - Painter, Thomas H AU - Deems, Jeffrey S AU - Bryant, Ann C AU - Landry, Christopher C AD - Department of Geography, University of California,Los Angeles, California,USA., thomas.painter@jpl.nasa.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - [np] PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 48 IS - 7 SN - 0043-1397, 0043-1397 KW - Meteorological & Geoastrophysical Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; Water Resources Abstracts; Aqualine Abstracts KW - dust KW - radiative forcing KW - snowmelt KW - Dust deposition KW - River Basins KW - Basins KW - Water resources KW - Snow Cover KW - Freshwater KW - Radiative forcing KW - Seasonal variability KW - Outflow KW - Snow cover duration KW - River basins KW - Solar irradiance KW - USA, Colorado KW - Energy balance KW - Snow cover water equivalent KW - Alpine environments KW - Solar variability KW - Snow melting KW - Variability KW - Dust KW - Snow KW - Temporal variations KW - USA, Arizona, Colorado R. basin KW - Temperature KW - Snow cover KW - Dusts KW - Interannual variability KW - Energy KW - Snowmelt KW - Snow-Water Equivalent KW - Water resources research KW - Evolution KW - AQ 00001:Water Resources and Supplies KW - SW 3010:Identification of pollutants KW - Q5 08502:Methods and instruments KW - M2 556.12:Precipitation (556.12) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566844815?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Dust+radiative+forcing+in+snow+of+the+Upper+Colorado+River+Basin%3A+2.+Interannual+variability+in+radiative+forcing+and+snowmelt+rates&rft.au=Skiles%2C+SMcKenzie%3BPainter%2C+Thomas+H%3BDeems%2C+Jeffrey+S%3BBryant%2C+Ann+C%3BLandry%2C+Christopher+C&rft.aulast=Skiles&rft.aufirst=SMcKenzie&rft.date=2012-07-01&rft.volume=48&rft.issue=7&rft.spage=%5Bnp%5D&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2012WR011986 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2014-12-11 N1 - SubjectsTermNotLitGenreText - Energy balance; Temporal variations; Snow; Water resources; River basins; Dust; Dust deposition; Snow melting; Solar variability; Snow cover duration; Snow cover; Solar irradiance; Interannual variability; Radiative forcing; Snow cover water equivalent; Seasonal variability; Water resources research; Energy; Temperature; Snowmelt; Outflow; Basins; Alpine environments; River Basins; Variability; Snow-Water Equivalent; Snow Cover; Dusts; Evolution; USA, Colorado; USA, Arizona, Colorado R. basin; Freshwater DO - http://dx.doi.org/10.1029/2012WR011986 ER - TY - JOUR T1 - Dust radiative forcing in snow of the Upper Colorado River Basin: 1. A 6 year record of energy balance, radiation, and dust concentrations AN - 1566837536; 20688597 AB - Dust in snow accelerates snowmelt through its direct reduction of snow albedo and its further indirect reduction of albedo by accelerating the growth of snow grains. Since the westward expansion of the United States that began in the mid-19th century, the mountain snow cover of the Colorado River Basin has been subject to five-fold greater dust loading, largely from the Colorado Plateau and Great Basin. Radiative forcing of snowmelt by dust is not captured by conventional micrometeorological measurements, and must be monitored by a more comprehensive suite of radiation instruments. Here we present a 6 year record of energy balance and detailed radiation measurements in the Senator Beck Basin Study Area, San Juan Mountains, Colorado, USA. Data include broadband irradiance, filtered irradiance, broadband reflected flux, filtered reflected flux, broadband and visible albedo, longwave irradiance, wind speed, relative humidity, and air temperatures. The gradient of the snow surface is monitored weekly and used to correct albedo measurements for geometric effects. The snow is sampled weekly for dust concentrations in plots immediately adjacent to each tower over the melt season. Broadband albedo in the last weeks of snow cover ranged from 0.33 to 0.55 across the 6 years and two sites. Total end of year dust concentration in the top 3 cm of the snow column ranged from 0.23 mg g super(-1) to 4.16 mg g super(-1). These measurements enable monitoring and modeling of dust and climate-driven snowmelt forcings in the Upper Colorado River Basin. Key Points * Radiative forcing by dust in snow is not captured by conventional measurements * We present a 6 year record of energy balance and detailed radiation measurements * These measurements give unique understanding of snowmelt in Upper Colorado River JF - Water Resources Research AU - Painter, Thomas H AU - Skiles, SMcKenzie AU - Deems, Jeffrey S AU - Bryant, Ann C AU - Landry, Christopher C AD - Jet Propulsion Laboratory, California Institute of Technology,Pasadena, California,USA., thomas.painter@jpl.nasa.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - [np] PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 48 IS - 7 SN - 0043-1397, 0043-1397 KW - Meteorological & Geoastrophysical Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; Water Resources Abstracts; Aqualine Abstracts KW - Colorado River KW - dust KW - radiative forcing KW - snowmelt KW - Relative humidity KW - Snow melting KW - River Basins KW - Water resources KW - Snow Cover KW - Freshwater KW - Radiation instruments KW - Dust KW - Air temperature KW - USA, Colorado R. KW - Micrometeorological measurements KW - Radiative forcing KW - Radiation KW - Seasonal variability KW - Mountain snow cover KW - Snow KW - Albedo KW - Climate KW - USA, Arizona, Colorado R. basin KW - USA, Colorado Plateau KW - River basins KW - Snow cover KW - Dusts KW - USA, Colorado KW - USA, Great Basin KW - Energy balance KW - Energy KW - Snowmelt KW - Radiation measurements KW - Water resources research KW - Fluctuations KW - SW 5010:Network design KW - Q5 08502:Methods and instruments KW - AQ 00003:Monitoring and Analysis of Water and Wastes KW - M2 556.12:Precipitation (556.12) UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566837536?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Dust+radiative+forcing+in+snow+of+the+Upper+Colorado+River+Basin%3A+1.+A+6+year+record+of+energy+balance%2C+radiation%2C+and+dust+concentrations&rft.au=Painter%2C+Thomas+H%3BSkiles%2C+SMcKenzie%3BDeems%2C+Jeffrey+S%3BBryant%2C+Ann+C%3BLandry%2C+Christopher+C&rft.aulast=Painter&rft.aufirst=Thomas&rft.date=2012-07-01&rft.volume=48&rft.issue=7&rft.spage=%5Bnp%5D&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2012WR011985 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2014-12-11 N1 - SubjectsTermNotLitGenreText - Relative humidity; Energy balance; Snow; Albedo; Climate; Water resources; River basins; Air temperature; Dust; Snow melting; Snow cover; Radiation instruments; Micrometeorological measurements; Radiative forcing; Radiation; Radiation measurements; Seasonal variability; Water resources research; Mountain snow cover; River Basins; Energy; Snowmelt; Snow Cover; Fluctuations; Dusts; USA, Colorado R.; USA, Great Basin; USA, Colorado; USA, Arizona, Colorado R. basin; USA, Colorado Plateau; Freshwater DO - http://dx.doi.org/10.1029/2012WR011985 ER - TY - JOUR T1 - Calibration of two-dimensional floodplain modeling in the central Atchafalaya Basin Floodway System using SAR interferometry AN - 1566829514; 20688585 AB - Two-dimensional (2-D) satellite imagery has been increasingly employed to improve prediction of floodplain inundation models. However, most focus has been on validation of inundation extent, with little attention on the spatial variations of water elevation and slope. The availability of high resolution Interferometric Synthetic Aperture Radar (InSAR) imagery offers unprecedented opportunity for quantitative validation of surface water heights and slopes derived from 2D hydrodynamic models. In this study, the LISFLOOD-ACC hydrodynamic model is applied to the central Atchafalaya Basin Floodway System, Louisiana, during high flows typical of spring floods in the Mississippi Delta region, for the purpose of demonstrating the utility of InSAR in 2-D floodplain model calibration. Two schemes calibrating Manning's roughness in channels and floodplains are compared. First, the model is calibrated in terms of water elevations at a single in situ gage during a 62-d simulation period from 1 April 2008 to 1 June 2008. Second, the model is calibrated in terms of water elevation changes calculated from ALOS PALSAR 2D imagery acquired on 16 April 2008 and 1 June 2009, an interval of 46 d. The best-fit model shows that the mean absolute error is 5.7 cm/46 d for InSAR water level calibration. Daily storage changes within the 230-km super(2) model area are also calculated to be on the order of 107 m super(3) d super(-1) during high water of the modeled period. The favorable comparison between both approaches demonstrates the feasibility of SAR interferometry for 2-D hydrodynamic model calibration and for improved understanding of complex floodplain hydrodynamics. Key Points * To run hydrodyanmic modeling in the central Atchafalaya Basin Floodway System * To process Interferometric Synthetic Aperture Radar * To improve the calibration of 2D floodplain hydrodynamic modeling JF - Water Resources Research AU - Jung, Hahn Chul AU - Jasinski, Michael AU - Kim, Jin-Woo AU - Shum, C K AU - Bates, Paul AU - Neal, Jeffrey AU - Lee, Hyongki AU - Alsdorf, Doug AD - Hydrological Sciences Laboratory, NASA Goddard Space Flight Center,Greenbelt, Maryland,USA., hahnchul.jung@nasa.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - [np] PB - American Geophysical Union, 2000 Florida Ave., N.W. Washington DC 20009 United States VL - 48 IS - 7 SN - 0043-1397, 0043-1397 KW - Meteorological & Geoastrophysical Abstracts; ASFA 3: Aquatic Pollution & Environmental Quality; Water Resources Abstracts; Aqualine Abstracts KW - Atchafalaya KW - LISFLOOD KW - PALSAR KW - hydrodynamics KW - interferometry KW - wetland KW - ASW, USA, Louisiana KW - Hydrodynamics KW - Water resources KW - Floodways KW - Radar imagery KW - ASW, USA, Louisiana, Mississippi Delta KW - ASW, USA, Louisiana, Atchafalaya Basin KW - Spatial variations KW - Water levels KW - Calibrations KW - Floods KW - Interferometric techniques KW - Slopes KW - Interferometry KW - Modelling KW - Model Studies KW - Flood Plains KW - Satellite sensing KW - Flood plains KW - Numerical simulations KW - Synthetic aperture radar KW - Elevation KW - Flooding KW - Hydrodynamic models KW - Water resources research KW - SW 5010:Network design KW - Q5 08503:Characteristics, behavior and fate KW - M2 556.16:Runoff (556.16) KW - AQ 00002:Water Quality UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1566829514?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Aaqualine&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Water+Resources+Research&rft.atitle=Calibration+of+two-dimensional+floodplain+modeling+in+the+central+Atchafalaya+Basin+Floodway+System+using+SAR+interferometry&rft.au=Jung%2C+Hahn+Chul%3BJasinski%2C+Michael%3BKim%2C+Jin-Woo%3BShum%2C+C+K%3BBates%2C+Paul%3BNeal%2C+Jeffrey%3BLee%2C+Hyongki%3BAlsdorf%2C+Doug&rft.aulast=Jung&rft.aufirst=Hahn&rft.date=2012-07-01&rft.volume=48&rft.issue=7&rft.spage=%5Bnp%5D&rft.isbn=&rft.btitle=&rft.title=Water+Resources+Research&rft.issn=00431397&rft_id=info:doi/10.1029%2F2012WR011951 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2014-09-01 N1 - Last updated - 2014-12-11 N1 - SubjectsTermNotLitGenreText - Water levels; Spatial variations; Satellite sensing; Flood plains; Synthetic aperture radar; Water resources; Radar imagery; Interferometry; Modelling; Numerical simulations; Hydrodynamics; Floods; Interferometric techniques; Hydrodynamic models; Water resources research; Flood Plains; Calibrations; Elevation; Flooding; Floodways; Slopes; Model Studies; ASW, USA, Louisiana; ASW, USA, Louisiana, Mississippi Delta; ASW, USA, Louisiana, Atchafalaya Basin DO - http://dx.doi.org/10.1029/2012WR011951 ER - TY - JOUR T1 - Sublimation-driven erosion on Hyperion; topographic analysis and landform simulation model tests AN - 1039340755; 2012-082033 JF - Icarus AU - Howard, Alan D AU - Moore, Jeffrey M AU - Schenk, Paul M AU - White, Oliver L AU - Spencer, John Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 268 EP - 276 PB - Elsevier, New York, NY VL - 220 IS - 1 SN - 0019-1035, 0019-1035 KW - cratering KW - albedo KW - icy satellites KW - thermal inertia KW - impact features KW - erosion KW - Hyperion Satellite KW - landforms KW - simulation KW - carbon dioxide KW - sublimation KW - Cassini-Huygens Mission KW - topography KW - mass movements KW - ground-surface temperature KW - satellites KW - water KW - landform evolution KW - ejecta KW - weathering KW - morphology KW - models KW - volatiles KW - impact craters KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1039340755?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=Sublimation-driven+erosion+on+Hyperion%3B+topographic+analysis+and+landform+simulation+model+tests&rft.au=Howard%2C+Alan+D%3BMoore%2C+Jeffrey+M%3BSchenk%2C+Paul+M%3BWhite%2C+Oliver+L%3BSpencer%2C+John&rft.aulast=Howard&rft.aufirst=Alan&rft.date=2012-07-01&rft.volume=220&rft.issue=1&rft.spage=268&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.05.013 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 42 N1 - PubXState - NY N1 - Document feature - illus. N1 - Last updated - 2012-09-14 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - albedo; carbon dioxide; Cassini-Huygens Mission; cratering; ejecta; erosion; ground-surface temperature; Hyperion Satellite; icy satellites; impact craters; impact features; landform evolution; landforms; mass movements; models; morphology; satellites; simulation; sublimation; thermal inertia; topography; volatiles; water; weathering DO - http://dx.doi.org/10.1016/j.icarus.2012.05.013 ER - TY - JOUR T1 - An impact-induced stable, runaway climate on Mars AN - 1039340718; 2012-082028 JF - Icarus AU - Segura, Teresa L AU - McKay, Christopher P AU - Toon, Owen B Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 144 EP - 148 PB - Elsevier, New York, NY VL - 220 IS - 1 SN - 0019-1035, 0019-1035 KW - water KW - albedo KW - Argyre Basin KW - numerical models KW - asteroids KW - stability KW - atmosphere KW - water vapor KW - Mars KW - global change KW - atmospheric precipitation KW - impacts KW - paleoclimatology KW - temperature KW - carbon dioxide KW - terrestrial planets KW - planets KW - comets KW - fluvial features KW - cooling KW - greenhouse effect KW - climate KW - global warming KW - 04:Extraterrestrial geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1039340718?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Icarus&rft.atitle=An+impact-induced+stable%2C+runaway+climate+on+Mars&rft.au=Segura%2C+Teresa+L%3BMcKay%2C+Christopher+P%3BToon%2C+Owen+B&rft.aulast=Segura&rft.aufirst=Teresa&rft.date=2012-07-01&rft.volume=220&rft.issue=1&rft.spage=144&rft.isbn=&rft.btitle=&rft.title=Icarus&rft.issn=00191035&rft_id=info:doi/10.1016%2Fj.icarus.2012.04.013 L2 - http://www.sciencedirect.com/science/journal/00191035 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. N1 - Date revised - 2012-01-01 N1 - Number of references - 17 N1 - PubXState - NY N1 - Document feature - illus. N1 - Last updated - 2012-09-14 N1 - CODEN - ICRSA5 N1 - SubjectsTermNotLitGenreText - albedo; Argyre Basin; asteroids; atmosphere; atmospheric precipitation; carbon dioxide; climate; comets; cooling; fluvial features; global change; global warming; greenhouse effect; impacts; Mars; numerical models; paleoclimatology; planets; stability; temperature; terrestrial planets; water; water vapor DO - http://dx.doi.org/10.1016/j.icarus.2012.04.013 ER - TY - JOUR T1 - Outcome Measure to Assess Head-Down Bed Rest Subject Performance AN - 1038246625; 16976785 AB - Background: The purpose of the present sturlv was to develop an ob-jective outcome measure to assess the performance ot head-down bed rest subjects. The rationale behind the development was that the current outcome measure is subjective and dependent upon how much the clinical psychologist knows about subject behaviors during the study to rate them accurately. Methods: The behaviorallv anchored rating scales (BARS) were developed through the use of the critical incident technique, along with traditional BARS development procedures, and the use of focus groups. Results: Use of these methodologies yielded 86 usable critical incidents, which were used as anchors for the scales. Discussion: Further research will be necessary to determine whether or not associations exist between data from the BARS and psychological screening data. JF - Aviation, Space, and Environmental Medicine AU - Poritz, Julia M P AU - Seaton, Kimberly A AU - Zanello, Susana B AU - Cromwell, Ronita L AD - Universities Space Research Association, 3600 Bay Area Blvd, Houston, TX 77058, ronita.l.cromwell@nasa.gov Y1 - 2012/07// PY - 2012 DA - Jul 2012 SP - 691 EP - 695 PB - Aerospace Medical Association, 320 S. Henry St. Alexandria VA 22314-3579 United States VL - 83 IS - 7 SN - 0095-6562, 0095-6562 KW - Health & Safety Science Abstracts KW - Psychology KW - H 2000:Transportation UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1038246625?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ahealthsafetyabstracts&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.atitle=Outcome+Measure+to+Assess+Head-Down+Bed+Rest+Subject+Performance&rft.au=Poritz%2C+Julia+M+P%3BSeaton%2C+Kimberly+A%3BZanello%2C+Susana+B%3BCromwell%2C+Ronita+L&rft.aulast=Poritz&rft.aufirst=Julia+M&rft.date=2012-07-01&rft.volume=83&rft.issue=7&rft.spage=691&rft.isbn=&rft.btitle=&rft.title=Aviation%2C+Space%2C+and+Environmental+Medicine&rft.issn=00956562&rft_id=info:doi/10.3357%2FASEM.3223.2012 LA - English DB - ProQuest Environmental Science Collection N1 - Date revised - 2012-09-01 N1 - Number of references - 16 N1 - Last updated - 2015-03-19 N1 - SubjectsTermNotLitGenreText - Psychology DO - http://dx.doi.org/10.3357/ASEM.3223.2012 ER - TY - JOUR T1 - Impact of reservoir impoundment-caused groundwater level changes on regional slope stability; a case study in the Loess Plateau of western China AN - 1037241304; 2012-078738 AB - Due to its impact on regional groundwater levels, the impoundment of a reservoir is an important consideration for assessing the stability of surrounding slopes. This study presents a method for risk assessment and control of landslides in regions where groundwater levels can be affected by reservoir water levels. The method is illustrated with a case study of the Hongzhuang reservoir in Yanan city, northern Shaanxi province, China. A groundwater numerical model was developed using MODFLOW and the groundwater flow fields were calculated for different reservoir water levels. Safety factors were then obtained and the slope stability was analyzed. Moreover, a probabilistic slope analysis was performed by Monte-Carlo simulation to evaluate the reliability of slope stability and the probability of slope failure. Finally, a reasonable reservoir water level was determined according to the acceptable risk level, and a comprehensive risk mitigation method was proposed considering water level control, relocation, and drainage measures. Copyright 2012 Springer-Verlag JF - Environmental Earth Sciences AU - Zhang, Maosheng AU - Dong, Ying AU - Sun, Pingping Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1715 EP - 1725 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - Loess Plateau KW - Far East KW - erosion KW - ground water KW - environmental management KW - Shaanxi China KW - mass movements KW - basin management KW - Asia KW - China KW - reservoirs KW - Yanan China KW - Monte Carlo analysis KW - drainage KW - surface water KW - statistical analysis KW - water erosion KW - preventive measures KW - aquifers KW - landslides KW - Hongzhuang Reservoir KW - Zhaojiaan Landslide KW - regional KW - erosion control KW - risk assessment KW - water resources KW - slope stability KW - 30:Engineering geology KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241304?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Impact+of+reservoir+impoundment-caused+groundwater+level+changes+on+regional+slope+stability%3B+a+case+study+in+the+Loess+Plateau+of+western+China&rft.au=Zhang%2C+Maosheng%3BDong%2C+Ying%3BSun%2C+Pingping&rft.aulast=Zhang&rft.aufirst=Maosheng&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1715&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-012-1728-6 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 30 N1 - Document feature - illus. incl. sect., 6 tables, sketch map N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - aquifers; Asia; basin management; China; drainage; environmental management; erosion; erosion control; Far East; ground water; Hongzhuang Reservoir; landslides; Loess Plateau; mass movements; Monte Carlo analysis; preventive measures; regional; reservoirs; risk assessment; Shaanxi China; slope stability; statistical analysis; surface water; water erosion; water resources; Yanan China; Zhaojiaan Landslide DO - http://dx.doi.org/10.1007/s12665-012-1728-6 ER - TY - JOUR T1 - Irrigation-induced loess flow failure in Heifangtai Platform, north-west China AN - 1037241303; 2012-078737 AB - Because the construction of dams and hydro-electric power stations of Liujiaxia and Yanguoxia across the Yellow River in West Gansu Province, North-West China, inhabitants in the reservoir areas were resettled in Heifangtai Loess Platform. Irrigation thus started in 1968. Perched water table was significantly raised and resulted in many loess flow failures in the past 30 years. This type of landslide was often featured by long runout distance, high speed and recurrence. Laboratory tests along ICU and CSD stress paths were performed. It is shown that the loess has a strong strain-softening behavior and instability can occur in drained condition before undrained liquefaction. The failure mechanism of loess flow can be interpreted as the following process: with increasing perched water table, collapse in loess was first triggered in drained condition and led to undrained loading to adjacent soil in the lower saturated part of the loess platform. Under gravity loading applied by upper dry loess, undrained flow failure mobilized, eventually. Copyright 2011 Springer-Verlag JF - Environmental Earth Sciences AU - Xu, L AU - Dai, F C AU - Gong, Q M AU - Tham, L G AU - Min, H Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1707 EP - 1713 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - Far East KW - mechanism KW - Lanzhou China KW - power plants KW - Gansu China KW - liquefaction KW - irrigation KW - ground water KW - Heifangtai Platform KW - mass movements KW - dams KW - sediments KW - Asia KW - China KW - water use KW - soil mechanics KW - failures KW - clastic sediments KW - agriculture KW - liquefaction potential KW - hydroelectric energy KW - Yongjing China KW - Huang He KW - water table KW - landslides KW - fluctuations KW - loess KW - risk assessment KW - slope stability KW - permeability KW - land use KW - 30:Engineering geology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241303?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Irrigation-induced+loess+flow+failure+in+Heifangtai+Platform%2C+north-west+China&rft.au=Xu%2C+L%3BDai%2C+F+C%3BGong%2C+Q+M%3BTham%2C+L+G%3BMin%2C+H&rft.aulast=Xu&rft.aufirst=L&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1707&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-011-0950-y L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 25 N1 - Document feature - illus. incl. 1 table N1 - SuppNotes - Supplemental information/data is available in the online version of this article N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - agriculture; Asia; China; clastic sediments; dams; failures; Far East; fluctuations; Gansu China; ground water; Heifangtai Platform; Huang He; hydroelectric energy; irrigation; land use; landslides; Lanzhou China; liquefaction; liquefaction potential; loess; mass movements; mechanism; permeability; power plants; risk assessment; sediments; slope stability; soil mechanics; water table; water use; Yongjing China DO - http://dx.doi.org/10.1007/s12665-011-0950-y ER - TY - JOUR T1 - Assessment of shallow landslides from Hurricane Mitch in Central America using a physically based model AN - 1037241302; 2012-078736 AB - Shallow landslides induced by heavy rainfall events represent one of the most disastrous hazards in mountainous regions because of their high frequency and rapid mobility. Recent advancements in the availability and accessibility of remote sensing data, including topography, land cover and precipitation products, allow landslide hazard assessment to be considered at larger spatial scales. A theoretical framework for a landslide forecasting system was prototyped in this study using several remotely sensed and surface parameters. The applied physical model SLope-Infiltration-Distributed Equilibrium (SLIDE) takes into account some simplified hypotheses on water infiltration and defines a direct relation between factor of safety and the rainfall depth on an infinite slope. This prototype model is applied to a case study in Honduras during Hurricane Mitch in 1998. Two study areas were selected where a high density of shallow landslides occurred, covering approximately 1,200 km (super 2) . The results were quantitatively evaluated using landslide inventory data compiled by the United States Geological Survey (USGS) following Hurricane Mitch's landfall. The agreement between the SLIDE modeling results and landslide observations demonstrates good predictive skill and suggests that this framework could serve as a potential tool for the future early landslide warning systems. Results show that within the two study areas, the values of rates of successful estimation of slope failure locations reached as high as 78 and 75%, while the error indices were 35 and 49%. Despite positive model performance, the SLIDE model is limited by several assumptions including using general parameter calibration rather than in situ tests and neglecting geologic information. Advantages and limitations of this physically based model are discussed with respect to future applications of landslide assessment and prediction over large scales. JF - Environmental Earth Sciences AU - Liao, Zonghu AU - Hong, Yang AU - Kirschbaum, Dalia Bach AU - Liu, Chun Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1697 EP - 1705 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - early warning systems KW - geologic hazards KW - moisture KW - mapping KW - atmospheric precipitation KW - Nicaragua KW - digital terrain models KW - SLIDE model KW - data management KW - spatial distribution KW - mitigation KW - Earth Observing System KW - warning systems KW - Honduras KW - mass movements KW - algorithms KW - ASTER instrument KW - hydrology KW - soil mechanics KW - monitoring KW - rainfall KW - human activity KW - Hurricane Mitch KW - damage KW - prediction KW - satellite methods KW - information management KW - measurement KW - models KW - case studies KW - landslides KW - infiltration KW - natural hazards KW - risk assessment KW - slope stability KW - Central America KW - remote sensing KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241302?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Assessment+of+shallow+landslides+from+Hurricane+Mitch+in+Central+America+using+a+physically+based+model&rft.au=Liao%2C+Zonghu%3BHong%2C+Yang%3BKirschbaum%2C+Dalia+Bach%3BLiu%2C+Chun&rft.aulast=Liao&rft.aufirst=Zonghu&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1697&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-011-0997-9 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 27 N1 - Document feature - illus. incl. 2 tables, sketch maps N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - algorithms; ASTER instrument; atmospheric precipitation; case studies; Central America; damage; data management; digital terrain models; early warning systems; Earth Observing System; geologic hazards; Honduras; human activity; Hurricane Mitch; hydrology; infiltration; information management; landslides; mapping; mass movements; measurement; mitigation; models; moisture; monitoring; natural hazards; Nicaragua; prediction; rainfall; remote sensing; risk assessment; satellite methods; SLIDE model; slope stability; soil mechanics; spatial distribution; warning systems DO - http://dx.doi.org/10.1007/s12665-011-0997-9 ER - TY - JOUR T1 - Advances in landslide nowcasting; evaluation of a global and regional modeling approach AN - 1037241301; 2012-078735 AB - The increasing availability of remotely sensed data offers a new opportunity to address landslide hazard assessment at larger spatial scales. A prototype global satellite-based landslide hazard algorithm has been developed to identify areas that may experience landslide activity. This system combines a calculation of static landslide susceptibility with satellite-derived rainfall estimates and uses a threshold approach to generate a set of 'nowcasts' that classify potentially hazardous areas. A recent evaluation of this algorithm framework found that while this tool represents an important first step in larger-scale near real-time landslide hazard assessment efforts, it requires several modifications before it can be fully realized as an operational tool. This study draws upon a prior work's recommendations to develop a new approach for considering landslide susceptibility and hazard at the regional scale. This case study calculates a regional susceptibility map using remotely sensed and in situ information and a database of landslides triggered by Hurricane Mitch in 1998 over four countries in Central America. The susceptibility map is evaluated with a regional rainfall intensity-duration triggering threshold and results are compared with the global algorithm framework for the same event. Evaluation of this regional system suggests that this empirically based approach provides one plausible way to approach some of the data and resolution issues identified in the global assessment. The presented methodology is straightforward to implement, improves upon the global approach, and allows for results to be transferable between regions. The results also highlight several remaining challenges, including the empirical nature of the algorithm framework and adequate information for algorithm validation. Conclusions suggest that integrating additional triggering factors such as soil moisture may help to improve algorithm performance accuracy. The regional algorithm scenario represents an important step forward in advancing regional and global-scale landslide hazard assessment. Copyright 2012 Springer-Verlag and 2011 US Government JF - Environmental Earth Sciences AU - Kirschbaum, Dalia Bach AU - Adler, Robert AU - Hong, Yang AU - Kumar, Sujay AU - Peters-Lidard, Christa AU - Lerner-Lam, Arthur Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1683 EP - 1696 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - early warning systems KW - geologic hazards KW - moisture KW - mapping KW - atmospheric precipitation KW - Nicaragua KW - data management KW - mitigation KW - warning systems KW - Honduras KW - El Salvador KW - mass movements KW - algorithms KW - real-time methods KW - hydrology KW - soil mechanics KW - monitoring KW - rainfall KW - human activity KW - Guatemala KW - global KW - Hurricane Mitch KW - damage KW - prediction KW - satellite methods KW - information management KW - landslide susceptibility KW - measurement KW - models KW - landslides KW - regional KW - natural hazards KW - slope stability KW - Central America KW - remote sensing KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241301?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Advances+in+landslide+nowcasting%3B+evaluation+of+a+global+and+regional+modeling+approach&rft.au=Kirschbaum%2C+Dalia+Bach%3BAdler%2C+Robert%3BHong%2C+Yang%3BKumar%2C+Sujay%3BPeters-Lidard%2C+Christa%3BLerner-Lam%2C+Arthur&rft.aulast=Kirschbaum&rft.aufirst=Dalia&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1683&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-011-0990-3 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 55 N1 - Document feature - illus. incl. 2 tables, geol. sketch map N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - algorithms; atmospheric precipitation; Central America; damage; data management; early warning systems; El Salvador; geologic hazards; global; Guatemala; Honduras; human activity; Hurricane Mitch; hydrology; information management; landslide susceptibility; landslides; mapping; mass movements; measurement; mitigation; models; moisture; monitoring; natural hazards; Nicaragua; prediction; rainfall; real-time methods; regional; remote sensing; satellite methods; slope stability; soil mechanics; warning systems DO - http://dx.doi.org/10.1007/s12665-011-0990-3 ER - TY - JOUR T1 - Rainfall-induced landslide susceptibility zonation of Puerto Rico AN - 1037241300; 2012-078734 AB - Landslides are a major geologic hazard with estimated tens of deaths and JF - Environmental Earth Sciences AU - Lepore, Chiara AU - Kamal, Sameer A AU - Shanahan, Peter AU - Bras, Rafael L Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1667 EP - 1681 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - Greater Antilles KW - geologic hazards KW - mapping KW - mitigation KW - geographic information systems KW - Puerto Rico KW - mass movements KW - zoning KW - hydrology KW - soil mechanics KW - bivariate analysis KW - risk management KW - rainfall KW - statistical analysis KW - regional planning KW - West Indies KW - Caribbean region KW - landslide susceptibility KW - landslides KW - Antilles KW - saturation KW - land management KW - natural hazards KW - risk assessment KW - information systems KW - regression analysis KW - land use KW - 21:Hydrogeology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241300?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Rainfall-induced+landslide+susceptibility+zonation+of+Puerto+Rico&rft.au=Lepore%2C+Chiara%3BKamal%2C+Sameer+A%3BShanahan%2C+Peter%3BBras%2C+Rafael+L&rft.aulast=Lepore&rft.aufirst=Chiara&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1667&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-011-0976-1 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 50 N1 - Document feature - illus. incl. 1 table, geol. sketch maps N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - Antilles; bivariate analysis; Caribbean region; geographic information systems; geologic hazards; Greater Antilles; hydrology; information systems; land management; land use; landslide susceptibility; landslides; mapping; mass movements; mitigation; natural hazards; Puerto Rico; rainfall; regional planning; regression analysis; risk assessment; risk management; saturation; soil mechanics; statistical analysis; West Indies; zoning DO - http://dx.doi.org/10.1007/s12665-011-0976-1 ER - TY - JOUR T1 - Geohazard reconnaissance mapping for a settlement area AN - 1037241299; 2012-078733 AB - To minimise the losses associated with natural hazards, it is necessary to compile and evaluate earth science data. This study describes and maps the geohazards that may affect the Egirdir (Isparta) settlement area. For these purposes, field studies were performed, and the data obtained were compiled using Geographical Information Systems (GIS). Four different types of earth slump were identified: paleo, small-scale shallow, active and potential earth slump. In addition, two rockfall source areas were identified and mapped. The ratio of the area affected by rockfall to the total area is 2.03%. Although there is no expected risk associated with active earth slump, displacement in the potential earth slump area represents a risk. The risk level calculated is 1.5% for 1 year. Based on all of the data, a geohazard reconnaissance map of the study area was prepared. Based on this map, it can be concluded that 83% of the overall study area has no risk of mass movement. Copyright 2011 Springer-Verlag JF - Environmental Earth Sciences AU - Yesiloglu-Gultekin, N AU - Gokceoglu, C AU - Sonmez, H Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1653 EP - 1666 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - geologic hazards KW - engineering properties KW - mapping KW - environmental management KW - substrates KW - geographic information systems KW - mass movements KW - Isparta Turkey KW - Asia KW - Middle East KW - stratigraphy KW - soil mechanics KW - rockfalls KW - regional planning KW - Turkey KW - Egirdir Turkey KW - Lake Egirdir KW - paleogeography KW - landslides KW - land management KW - natural hazards KW - risk assessment KW - information systems KW - land use KW - 30:Engineering geology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241299?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Geohazard+reconnaissance+mapping+for+a+settlement+area&rft.au=Yesiloglu-Gultekin%2C+N%3BGokceoglu%2C+C%3BSonmez%2C+H&rft.aulast=Yesiloglu-Gultekin&rft.aufirst=N&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1653&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-011-0984-1 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 42 N1 - Document feature - illus. incl. 8 tables, geol. sketch maps N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - Asia; Egirdir Turkey; engineering properties; environmental management; geographic information systems; geologic hazards; information systems; Isparta Turkey; Lake Egirdir; land management; land use; landslides; mapping; mass movements; Middle East; natural hazards; paleogeography; regional planning; risk assessment; rockfalls; soil mechanics; stratigraphy; substrates; Turkey DO - http://dx.doi.org/10.1007/s12665-011-0984-1 ER - TY - JOUR T1 - Determination of mechanisms and hydrogeological environments of Gangxianlane landslides using geoelectrical and geological data in central Taiwan AN - 1037241298; 2012-078732 AB - Electrical resistivity tomography (ERT), single-point-resistance logging with time-lapse, and geological and groundwater level data, are utilized to determine the mechanism of, and a hydrogeological model of, the Gangxianlane landslide in the west-central part of Taiwan. The rock surface and geometry of the colluviums were found by integrating ERT and borehole data. The iso-resistivity line in the bedrock broadly followed the bedding plane, indicating that the contribution of lithology to resistivity exceeds that of groundwater. The results of single-point-resistance logging with time-lapse and borehole data reveal that the bedrock has low permeability, which is associated with poorly developed joints and fractures. The fine grain content part (including the clayey layer), almost parallel to the bedding plane of the bedrock and between the colluvium and the bedrock in the upper part of the landslide, served as the slip surface and is believed to have been recently produced. It can block and retain water in the colluviums. Accordingly, this slip surface has the potential to re-slip in the future. Another slope failure involved rock collapse by a well-developed open release joint close to the Huoshaoping Terrace. It is also related to groundwater flow over a large gradient from the Huoshaoping Terrace. It is a key to determining whether this landslide will expand in the future. Copyright 2012 Springer-Verlag JF - Environmental Earth Sciences AU - Lee, Cheng-Chao AU - Zeng, Li-Sheng AU - Hsieh, Chin-Hsien AU - Yu, Chun-Yi AU - Hsieh, Sheng-Hsiung Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1641 EP - 1651 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - tomography KW - Taiwan KW - Taichung Basin KW - Cholan Formation KW - West Foothills KW - Far East KW - sandstone KW - mechanism KW - landforms KW - erosion features KW - terraces KW - Huoshaoping Terrace KW - rock mechanics KW - ground water KW - Cenozoic KW - sedimentary rocks KW - electrical anomalies KW - siltstone KW - mass movements KW - sediments KW - Asia KW - bedrock KW - monitoring KW - Quaternary KW - colluvium KW - clastic sediments KW - geophysical methods KW - electrical methods KW - basement KW - resistivity KW - dipole-dipole methods KW - geometry KW - models KW - water table KW - landslides KW - fluctuations KW - boreholes KW - Tachia River KW - Gangxianlane Landslides KW - Pleistocene KW - clastic rocks KW - permeability KW - arrays KW - 23:Geomorphology KW - 21:Hydrogeology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241298?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Determination+of+mechanisms+and+hydrogeological+environments+of+Gangxianlane+landslides+using+geoelectrical+and+geological+data+in+central+Taiwan&rft.au=Lee%2C+Cheng-Chao%3BZeng%2C+Li-Sheng%3BHsieh%2C+Chin-Hsien%3BYu%2C+Chun-Yi%3BHsieh%2C+Sheng-Hsiung&rft.aulast=Lee&rft.aufirst=Cheng-Chao&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1641&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-012-1522-5 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 26 N1 - Document feature - illus. incl. sketch maps N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - arrays; Asia; basement; bedrock; boreholes; Cenozoic; Cholan Formation; clastic rocks; clastic sediments; colluvium; dipole-dipole methods; electrical anomalies; electrical methods; erosion features; Far East; fluctuations; Gangxianlane Landslides; geometry; geophysical methods; ground water; Huoshaoping Terrace; landforms; landslides; mass movements; mechanism; models; monitoring; permeability; Pleistocene; Quaternary; resistivity; rock mechanics; sandstone; sedimentary rocks; sediments; siltstone; Tachia River; Taichung Basin; Taiwan; terraces; tomography; water table; West Foothills DO - http://dx.doi.org/10.1007/s12665-012-1522-5 ER - TY - JOUR T1 - Mountain erosion and mitigation; global state of art AN - 1037241297; 2012-078731 AB - Mountain erosion mapping is one of the important aspects for monitoring environmental degradation. Global climate change coupled with human activities is eroding the mountain regions of the world at an alarming rate. The various types of erosion can be classified as water erosion, aeolian erosion, glaciered erosion, gravity erosion and man-made erosion. Tectonic activity also plays a major role towards mountain erosion. Soil erosion along with debris flow and rock falling not only causes loss of human life and property, but also affects the climatic condition of the mountain regions. Mountain erosion mitigation and protection methods include wire mesh fencing with inclusion of brush layers and brush mats on fascines, constructing check dams and slope benches and application of bioengineering works such as plantation and vegetation growth. This study consists of the global scenario with some of the state-of-the-art methods for mitigation and mappings of mountain erosion. The erosion in mountainous regions can be controlled with the help of suitable vegetation and plant growth, with installation of special bioengineered materials. However, public awareness is also considered as an important factor. Moreover, it is found that mapping the rate of erosion greatly helps to make proper action plan against the erosion process. Copyright 2012 Springer-Verlag JF - Environmental Earth Sciences AU - Patel, Anjan Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1631 EP - 1639 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - erosion KW - Alps KW - Tien Shan KW - reinforced materials KW - Appalachians KW - mapping KW - Europe KW - erosion features KW - vegetation KW - debris flows KW - Italy KW - climate change KW - Central Asia KW - Southern Europe KW - India KW - data management KW - mountains KW - mitigation KW - neotectonics KW - Commonwealth of Independent States KW - Indian Peninsula KW - mass movements KW - tectonics KW - Pamirs KW - Caucasus KW - Asia KW - deforestation KW - Urals KW - Ghats KW - North America KW - revegetation KW - human activity KW - global KW - Hindu Kush KW - damage KW - wind erosion KW - water erosion KW - Carpathians KW - bioengineering KW - Western Ghats KW - information management KW - Balkan Peninsula KW - Apennines KW - erosion control KW - slope stability KW - rockslides KW - 23:Geomorphology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241297?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Mountain+erosion+and+mitigation%3B+global+state+of+art&rft.au=Patel%2C+Anjan&rft.aulast=Patel&rft.aufirst=Anjan&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1631&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-012-1524-3 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 39 N1 - Document feature - illus. N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - Alps; Apennines; Appalachians; Asia; Balkan Peninsula; bioengineering; Carpathians; Caucasus; Central Asia; climate change; Commonwealth of Independent States; damage; data management; debris flows; deforestation; erosion; erosion control; erosion features; Europe; Ghats; global; Hindu Kush; human activity; India; Indian Peninsula; information management; Italy; mapping; mass movements; mitigation; mountains; neotectonics; North America; Pamirs; reinforced materials; revegetation; rockslides; slope stability; Southern Europe; tectonics; Tien Shan; Urals; vegetation; water erosion; Western Ghats; wind erosion DO - http://dx.doi.org/10.1007/s12665-012-1524-3 ER - TY - JOUR T1 - Seismic landslide analysis; Gurpinar (Istanbul) as a case history AN - 1037241296; 2012-078730 AB - Slope failures triggered by earthquakes are among the most important soil mechanics problems. In this study, static and pseudostatic analyses of slope stability for earthquake conditions were carried out in the Gurpinar area. In situ testing (SPT) was carried out and laboratory samples were obtained from six boreholes (maximum depth 50.0 m) to determine soil classification and strength characteristics. Geophysical studies (seismic refraction and MASW) were also carried out in the area to estimate the structure and stiffness strength characteristics of the slope to 50.0 m depth. All field and laboratory data were used to determine the mechanical and structural (geometrical) behavior of the slope. In order to solve the slope stability problem, three soil slope models were considered. Pseudostatic analysis was carried out to estimate the earthquake acceleration seismic hazard in the region. These analyses showed that, while there was no potential slope instability under static load conditions, some problems would appear with increasing earthquake acceleration. A geotechnical slope improvement project is proposed for the study area. Copyright 2010 Springer-Verlag JF - Environmental Earth Sciences AU - Ozcep, Ferhat AU - Erol, Engin AU - Saracoglu, Fatih AU - Haliloglu, Mustafa Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1617 EP - 1630 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - soil mechanics KW - failures KW - Sea of Marmara region KW - penetration tests KW - engineering properties KW - strength KW - Gurpinar Turkey KW - stiffness KW - Turkey KW - seismic response KW - rock mechanics KW - landslides KW - rupture KW - cracks KW - seismic risk KW - mass movements KW - epicenters KW - Asia KW - slope stability KW - earthquakes KW - Middle East KW - Istanbul Turkey KW - 30:Engineering geology KW - 19:Seismology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241296?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Seismic+landslide+analysis%3B+Gurpinar+%28Istanbul%29+as+a+case+history&rft.au=Ozcep%2C+Ferhat%3BErol%2C+Engin%3BSaracoglu%2C+Fatih%3BHaliloglu%2C+Mustafa&rft.aulast=Ozcep&rft.aufirst=Ferhat&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1617&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-010-0853-3 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 38 N1 - Document feature - illus. incl. 9 tables, geol. sketch maps N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - Asia; cracks; earthquakes; engineering properties; epicenters; failures; Gurpinar Turkey; Istanbul Turkey; landslides; mass movements; Middle East; penetration tests; rock mechanics; rupture; Sea of Marmara region; seismic response; seismic risk; slope stability; soil mechanics; stiffness; strength; Turkey DO - http://dx.doi.org/10.1007/s12665-010-0853-3 ER - TY - JOUR T1 - The 2010 Yushu earthquake triggered landslide hazard mapping using GIS and weight of evidence modeling AN - 1037241295; 2012-078729 AB - The Yushu County, Qinghai Province, China, April 14, 2010, earthquake triggered thousands of landslides in a zone between 96 degrees 20'32.9"E and 97 degrees 10'8.9"E, and 32 degrees 52'6.7"N and 33 degrees 19'47.9"N. This study examines the use of geographic information system (GIS) technology and Bayesian statistics in creating a suitable landslide hazard-zone map of good predictive power. A total of 2,036 landslides were interpreted from high-resolution aerial photographs and multi-source satellite images pre- and post-earthquake, and verified by selected field checking before a final landslide-inventory map of the study area could be established using GIS software. The 2,036 landslides were randomly partitioned into two subsets: a training dataset, which contains 80 % (1,628 landslides), for training the model; and a testing dataset 20 % (408 landslides). Twelve earthquake triggered landslide associated controlling parameters, such as elevation, slope gradient, slope aspect, slope curvature, topographic position, distance from main surface ruptures, peak ground acceleration, distance from roads, normalized difference vegetation index, distance from drainages, lithology, and distance from all faults were obtained from variety of data sources. Landslide hazard indices were calculated using the weight of evidence model. The landslide hazard map was compared with training data and testing data to obtain the success rate and predictive rate of the model, respectively. The validation results showed satisfactory agreement between the hazard map and the existing landslide distribution data. The success rate is 80.607 %, and the predictive rate is 78.855 %. The resulting landslide hazard map showed five classes of landslide hazard, i.e., very high, high, moderate, low and very low. The landslide hazard evaluation map should be useful for environmental recovery planning and reconstruction work. Copyright 2012 Springer-Verlag JF - Environmental Earth Sciences AU - Xu, Chong AU - Xu, Xiwei AU - Lee, Yuan Hsi AU - Tan, Xibin AU - Yu, Guihua AU - Dai, Fuchu Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1603 EP - 1616 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - Far East KW - geologic hazards KW - mapping KW - models KW - landslides KW - Yushu earthquake 2010 KW - rupture KW - geographic information systems KW - planning KW - Qinghai China KW - mass movements KW - natural hazards KW - ground motion KW - information systems KW - reconstruction KW - Asia KW - earthquakes KW - China KW - 19:Seismology KW - 22:Environmental geology UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241295?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=The+2010+Yushu+earthquake+triggered+landslide+hazard+mapping+using+GIS+and+weight+of+evidence+modeling&rft.au=Xu%2C+Chong%3BXu%2C+Xiwei%3BLee%2C+Yuan+Hsi%3BTan%2C+Xibin%3BYu%2C+Guihua%3BDai%2C+Fuchu&rft.aulast=Xu&rft.aufirst=Chong&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1603&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-012-1624-0 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verlag, Berlin, Federal Republic of Germany N1 - Date revised - 2012-01-01 N1 - Number of references - 30 N1 - Document feature - illus. incl. 4 tables, geol. sketch maps N1 - Last updated - 2012-08-31 N1 - SubjectsTermNotLitGenreText - Asia; China; earthquakes; Far East; geographic information systems; geologic hazards; ground motion; information systems; landslides; mapping; mass movements; models; natural hazards; planning; Qinghai China; reconstruction; rupture; Yushu earthquake 2010 DO - http://dx.doi.org/10.1007/s12665-012-1624-0 ER - TY - JOUR T1 - Ground stability assessment using geophysics and field observation techniques AN - 1037241294; 2012-078728 AB - Inspection of ground stability is necessary to ensure the suitability of an area for engineering and environmental applications. In a certain area, a combination of measurement of cracks and seismic refraction method can provide a better knowledge of the future behavior of the area in terms of its stability. In this reconnaissance study, seismic refraction method and continuous measurements of crack displacement were conducted to detect the stability of an area that lies on the downstream side of the Mosul dam, and to establish its possible mechanisms of failure. The study shows two types of instability, namely, fall and sliding, and these were due to heavy rainfall, springs, and spillway operation. Copyright 2011 Springer-Verlag JF - Environmental Earth Sciences AU - Al-Saigh, Nabil H AU - Al-Dabbagh, Thanoon H Y1 - 2012/07// PY - 2012 DA - July 2012 SP - 1597 EP - 1601 PB - Springer, Berlin VL - 66 IS - 6 SN - 1866-6280, 1866-6280 KW - cliffs KW - engineering properties KW - stability KW - displacements KW - refraction methods KW - substrates KW - foundations KW - river banks KW - seismicity KW - mass movements KW - dams KW - tectonics KW - Mosul Dam KW - Asia KW - Middle East KW - faults KW - hydrology KW - soil mechanics KW - Tigris River KW - rainfall KW - geophysical methods KW - spillways KW - seismic methods KW - measurement KW - landslides KW - cracks KW - gravity sliding KW - saturation KW - Mosul Irak KW - slope stability KW - 30:Engineering geology KW - 20:Applied geophysics UR - http://libproxy.lib.unc.edu/login?url=http://search.proquest.com/docview/1037241294?accountid=14244 L2 - http://vb3lk7eb4t.search.serialssolutions.com/?ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/ProQ%3Ageorefmodule&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.genre=article&rft.jtitle=Environmental+Earth+Sciences&rft.atitle=Ground+stability+assessment+using+geophysics+and+field+observation+techniques&rft.au=Al-Saigh%2C+Nabil+H%3BAl-Dabbagh%2C+Thanoon+H&rft.aulast=Al-Saigh&rft.aufirst=Nabil&rft.date=2012-07-01&rft.volume=66&rft.issue=6&rft.spage=1597&rft.isbn=&rft.btitle=&rft.title=Environmental+Earth+Sciences&rft.issn=18666280&rft_id=info:doi/10.1007%2Fs12665-011-1515-9 L2 - http://www.springerlink.com/content/1866-6280 LA - English DB - GeoRef N1 - Copyright - GeoRef, Copyright 2012, American Geosciences Institute. Reference includes data supplied by Springer Verla