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Ice retreat in Wilkes Basin of East Antarctica during a warm interglacial 期刊论文
NATURE, 2020, 583 (7817) : 554-+
作者:  T. Blackburn;  G. H. Edwards;  S. Tulaczyk;  M. Scudder;  G. Piccione;  B. Hallet;  N. McLean;  J. C. Zachos;  B. Cheney;  J. T. Babbe
收藏  |  浏览/下载:18/0  |  提交时间:2020/08/09

Uranium isotopes in subglacial precipitates from the Wilkes Basin of the East Antarctic Ice Sheet reveal ice retreat during a warm Pleistocene interglacial period about 400,000 years ago.


Efforts to improve sea level forecasting on a warming planet have focused on determining the temperature, sea level and extent of polar ice sheets during Earth'  s past interglacial warm periods(1-3). About 400,000 years ago, during the interglacial period known as Marine Isotopic Stage 11 (MIS11), the global temperature was 1 to 2 degrees Celsius greater(2)and sea level was 6 to 13 metres higher(1,3). Sea level estimates in excess of about 10 metres, however, have been discounted because these require a contribution from the East Antarctic Ice Sheet(3), which has been argued to have remained stable for millions of years before and includes MIS11(4,5). Here we show how the evolution of(234)U enrichment within the subglacial waters of East Antarctica recorded the ice sheet'  s response to MIS11 warming. Within the Wilkes Basin, subglacial chemical precipitates of opal and calcite record accumulation of(234)U (the product of rock-water contact within an isolated subglacial reservoir) up to 20 times higher than that found in marine waters. The timescales of(234)U enrichment place the inception of this reservoir at MIS11. Informed by the(234)U cycling observed in the Laurentide Ice Sheet, where(234)U accumulated during periods of ice stability(6)and was flushed to global oceans in response to deglaciation(7), we interpret our East Antarctic dataset to represent ice loss within the Wilkes Basin at MIS11. The(234)U accumulation within the Wilkes Basin is also observed in the McMurdo Dry Valleys brines(8-10), indicating(11)that the brine originated beneath the adjacent East Antarctic Ice Sheet. The marine origin of brine salts(10)and bacteria(12)implies that MIS11 ice loss was coupled with marine flooding. Collectively, these data indicate that during one of the warmest Pleistocene interglacials, the ice sheet margin at the Wilkes Basin retreated to near the precipitate location, about 700 kilometres inland from the current position of the ice margin, which-assuming current ice volumes-would have contributed about 3 to 4 metres(13)to global sea levels.


  
The Orinoco Low-Level Jet: An Investigation of Its Mechanisms of Formation Using the WRF Model 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Jimenez-Sanchez, Giovanni;  Markowski, Paul M.;  Young, George S.;  Stensrud, David J.
收藏  |  浏览/下载:9/0  |  提交时间:2020/08/18
Orinoco low-level jet  forcing mechanisms  dynamical downscaling  momentum balance analysis  LLJs near the equator may originate from processes other than the inertial oscillation  LLJs near the equator may originate from processes other than topographic thermal forcing  
Modeling Spatial Heterogeneity in Surface Turbulent Heat Flux in the US Southern Great Plains 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Williams, Ian N.;  Lee, Jungmin M.;  Tadic, Jovan;  Zhang, Yunyan;  Chu, Housen
收藏  |  浏览/下载:10/0  |  提交时间:2020/08/18
Reduction in greenhouse gas emissions from national climate legislation 期刊论文
NATURE CLIMATE CHANGE, 2020
作者:  Eskander, Shaikh M. S. U.;  Fankhauser, Sam
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/21
Cloud Cover over the Arabian Peninsula from Global Remote Sensing and Reanalysis Products 期刊论文
ATMOSPHERIC RESEARCH, 2020, 238
作者:  Yousef, Latifa A.;  Temimi, Marouane;  Molini, Annalisa;  Weston, Michael;  Wehbe, Youssef;  Al Mandous, Abdulla
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/18
Acquiring environmental flows: ecological economics of policy development in western US 期刊论文
ECOLOGICAL ECONOMICS, 2020, 173
作者:  Colby, Bonnie
收藏  |  浏览/下载:10/0  |  提交时间:2020/08/18
Environmental flows  Markets  Water trading  Institutions  Conflict resolution  Patrimony  Social Ecological Economics of Water  Punctuated Equilibrium Theory  
Data assimilation of a dense wind profiler network and its impact on convective forecasting 期刊论文
ATMOSPHERIC RESEARCH, 2020, 238
作者:  Wang, Cheng;  Chen, Yaodeng;  Chen, Min;  Shen, Jie
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/18
Data assimilation  Wind profiler radar observation  Momentum control variables  Numerical weather prediction  
Late Paleozoic tectonic transition from subduction to post-collisional extension in Eastern Tianshan, Central Asian Orogenic Belt 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1756-1774
作者:  Muhtar, M. N.;  Wu, Chang-Zhi;  Santosh, M.;  Lei, Ru-Xiong;  Gu, Lian-Xing;  Wang, Si-Meng;  Gan, Kai
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/18
Grenvillean evolution of the Beishan Orogen, NW China: Implications for development of an active Rodinian margin 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1657-1680
作者:  Soldner, Jeremie;  Yuan, Chao;  Schulmann, Karel;  Stipska, Pavla;  Jiang, Yingde;  Zhang, Yunying;  Wang, Xinyu
收藏  |  浏览/下载:6/0  |  提交时间:2020/08/18
Low-impact land use pathways to deep decarbonization of electricity 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (7)
作者:  Wu, Grace C.;  Leslie, Emily;  Sawyerr, Oluwafemi;  Cameron, D. Richard;  Brand, Erica;  Cohen, Brian;  Allen, Douglas;  Ochoa, Marcela;  Olson, Arne
收藏  |  浏览/下载:8/0  |  提交时间:2020/08/18
renewable energy  deep decarbonization  land use  conservation  solar energy  wind energy  siting