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Paris Agreement targets could greatly reduce loss of ice sheets, glaciers 新闻
来源平台:National Center of Atmospheric Research. 发布日期:2021
作者:  admin
收藏  |  浏览/下载:14/0  |  提交时间:2021/05/07
Evidence of Antarctic glacier's tipping point confirmed for first time 新闻
来源平台:EurekAlert. 发布日期:2021
作者:  admin
收藏  |  浏览/下载:1/0  |  提交时间:2021/04/06
A rich source of nutrients under the Earth's ice sheets 新闻
来源平台:EurekAlert. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:4/0  |  提交时间:2020/11/25
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:19/0  |  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.


  
Multidecadal observations of the Antarctic ice sheet from restored analog radar records 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2019, 116 (38) : 18867-18873
作者:  Schroeder, Dustin M.;  Dowdeswell, Julian A.;  Siegert, Martin J.;  Bingham, Robert G.;  Chu, Winnie;  MacKie, Emma J.;  Siegfried, Matthew R.;  Vega, Katherine I.;  Emmons, John R.;  Winstein, Keith
收藏  |  浏览/下载:12/0  |  提交时间:2019/11/27
Antarctica  radio echo sounding  glaciology  remote sensing  archival data  
How fast will the Antarctic ice sheet retreat? 期刊论文
SCIENCE, 2019, 364 (6444) : 936-937
作者:  Steig, Eric J.
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/27
Slowdown in Antarctic mass loss from solid Earth and sea-level feedbacks 期刊论文
SCIENCE, 2019, 364 (6444) : 969-+
作者:  Larour, E.;  Seroussi, H.;  Adhikari, S.;  Ivins, E.;  Caron, L.;  Morlighem, M.;  Schlegel, N.
收藏  |  浏览/下载:6/0  |  提交时间:2019/11/27
NSF invites professional news media to submit proposals to report from Antarctica 新闻
来源平台:US National Scientific Foundation (NSF). 发布日期:2018
作者:  admin
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Previously unsuspected volcanic activity confirmed under West Antarctic Ice Sheet at Pine Island Glacier 新闻
来源平台:US National Scientific Foundation (NSF). 发布日期:2018
作者:  admin
收藏  |  浏览/下载:5/0  |  提交时间:2019/04/17
Rice, UH team preps for massive Antarctic glacier study 新闻
来源平台:US National Scientific Foundation (NSF). 发布日期:2018
作者:  admin
收藏  |  浏览/下载:0/0  |  提交时间:2019/04/17