中文版 | English

在结果中检索

GSTDTAP

浏览/检索结果: 共203条，第1-10条 帮助

限定条件        
已选(0)清除 条数/页：   排序方式：
Disproving the Bodele Depression as the Primary Source of Dust Fertilizing the Amazon Rainforest 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Yu, Yan;  Kalashnikova, Olga, V;  Garay, Michael J.;  Lee, Huikyo;  Notaro, Michael;  Campbell, James R.;  Marquis, Jared;  Ginoux, Paul;  Okin, Gregory S.
收藏  |  浏览/下载：16/0  |  提交时间：2020/06/29
dust transport  trajectory analysis  MISR  CALIOP  AOD  
A seawater throttle on H-2 production in Precambrian serpentinizing systems 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (26) : 14756-14763
作者:  Tutolo, Benjamin M.;  Seyfried, William E., Jr.;  Tosca, Nicholas J.
收藏  |  浏览/下载：9/0  |  提交时间：2020/06/22
serpentinization  Precambrian  atmosphere redox state  origins of life  
High Production of Soluble Iron Promoted by Aerosol Acidification in Fog 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Shi, Jinhui;  Guan, Yang;  Ito, Akinori;  Gao, Huiwang;  Yao, Xiaohong;  Baker, Alex R.;  Zhang, Daizhou
收藏  |  浏览/下载：9/0  |  提交时间：2020/06/16
aerosol acidification  dust  fog  haze  iron solubility  observation model comparison  
Massive formation of early diagenetic dolomite in the Ediacaran ocean: Constraints on the "dolomite problem" 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (25) : 14005-14014
作者:  Chang, Biao;  Li, Chao;  Liu, Deng;  Foster, Ian;  Tripati, Aradhna;  Lloyd, Max K.;  Maradiaga, Ingrid;  Luo, Genming;  An, Zhihui;  She, Zhenbing;  Xie, Shucheng;  Tong, Jinnan;  Huang, Junhua;  Algeo, Thomas J.;  Lyons, Timothy W.;  Immenhauser, Adrian
收藏  |  浏览/下载：17/0  |  提交时间：2020/06/16
Doushantuo Formation  clumped isotope  early diagenesis  carbonate geochemistry  early oceans  
Observations of a Deep Submesoscale Cyclonic Vortex in the Arabian Sea 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  de Marez, Charly;  39;Hegaret, Pierre
收藏  |  浏览/下载：11/0  |  提交时间：2020/06/01
submesoscale  observation  Arabian Sea  vortex  
Hydrothermal (NN)-N-15-N-15 abundances constrain the origins of mantle nitrogen 期刊论文
NATURE, 2020, 580 (7803) : 367-+
作者:  Zhao, Steven;  Jang, Cholsoon;  Liu, Joyce;  Uehara, Kahealani;  Gilbert, Michael;  Izzo, Luke;  Zeng, Xianfeng;  Trefely, Sophie;  Fernandez, Sully;  Carrer, Alessandro;  Miller, Katelyn D.;  Schug, Zachary T.;  Snyder, Nathaniel W.;  Gade, Terence P.;  Titchenell, Paul M.;  Rabinowitz, Joshua D.;  Wellen, Kathryn E.
收藏  |  浏览/下载：14/0  |  提交时间：2020/05/13

Nitrogen is the main constituent of the Earth'  s atmosphere, but its provenance in the Earth'  s mantle remains uncertain. The relative contribution of primordial nitrogen inherited during the Earth'  s accretion versus that subducted from the Earth'  s surface is unclear(1-6). Here we show that the mantle may have retained remnants of such primordial nitrogen. We use the rare (NN)-N-15-N-15 isotopologue of N-2 as a new tracer of air contamination in volcanic gas effusions. By constraining air contamination in gases from Iceland, Eifel (Germany) and Yellowstone (USA), we derive estimates of mantle delta N-15 (the fractional difference in N-15/N-14 from air), N-2/Ar-36 and N-2/He-3. Our results show that negative delta N-15 values observed in gases, previously regarded as indicating a mantle origin for nitrogen(7-10), in fact represent dominantly air-derived N-2 that experienced N-15/N-14 fractionation in hydrothermal systems. Using two-component mixing models to correct for this effect, the (NN)-N-15-N-15 data allow extrapolations that characterize mantle endmember delta N-15, N-2/Ar-36 and N-2/He-3 values. We show that the Eifel region has slightly increased delta N-15 and N-2/Ar-36 values relative to estimates for the convective mantle provided by mid-ocean-ridge basalts(11), consistent with subducted nitrogen being added to the mantle source. In contrast, we find that whereas the Yellowstone plume has delta N-15 values substantially greater than that of the convective mantle, resembling surface components(12-15), its N-2/Ar-36 and N-2/He-3 ratios are indistinguishable from those of the convective mantle. This observation raises the possibility that the plume hosts a primordial component. We provide a test of the subduction hypothesis with a two-box model, describing the evolution of mantle and surface nitrogen through geological time. We show that the effect of subduction on the deep nitrogen cycle may be less important than has been suggested by previous investigations. We propose instead that high mid-ocean-ridge basalt and plume delta N-15 values may both be dominantly primordial features.


  
Sediment controls dynamic behavior of a Cordilleran Ice Stream at the Last Glacial Maximum 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Cowan, Ellen A.;  Zellers, Sarah D.;  Mueller, Juliane;  Walczak, Maureen H.;  Worthington, Lindsay L.;  Caissie, Beth E.;  Clary, Wesley A.;  Jaeger, John M.;  Gulick, Sean P. S.;  Pratt, Jacob W.;  Mix, Alan C.;  Fallon, Stewart J.
收藏  |  浏览/下载：9/0  |  提交时间：2020/05/13
A Polar Surface Eddy Obscured by Thermal Stratification 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (6)
作者:  Porter, M.;  Henley, S. F.;  Orkney, A.;  Bouman, H. A.;  Hwang, B.;  Dumont, E.;  Venables, E. J.;  Cottier, F.
收藏  |  浏览/下载：7/0  |  提交时间：2020/07/02
Barents Sea  Polar Front  eddy  glider  
Infrasound and Gravity Waves Over the Andes Observed by a Pressure Sensor on Board a Stratospheric Balloon 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (6)
作者:  Poler, Guerman;  Garcia, Raphael F.;  Bowman, Daniel C.;  Martire, Leo
收藏  |  浏览/下载：8/0  |  提交时间：2020/07/02
stratospheric balloon  pressure sensor  mountain gravity waves  microbaroms  thunderstorm  
Impact of Cloud Ice Particle Size Uncertainty in a Climate Model and Implications for Future Satellite Missions 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (6)
作者:  Wang, Yuan;  Su, Hui;  Jiang, Jonathan H.;  Xu, Feng;  Yung, Yuk L.
收藏  |  浏览/下载：9/0  |  提交时间：2020/07/02