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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.


  
Warming trends increasingly dominate global ocean 期刊论文
NATURE CLIMATE CHANGE, 2020
作者:  Johnson, Gregory C.;  Lyman, John M.
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/21
Historic storms and the hidden value of coastal wetlands for nature-based flood defence 期刊论文
NATURE SUSTAINABILITY, 2020
作者:  Zhu, Zhenchang;  Vuik, Vincent;  Visser, Paul J.;  Soens, Tim;  van Wesenbeeck, Bregje;  van de Koppel, Johan;  Jonkman, Sebastiaan N.;  Temmerman, Stijn;  Bouma, Tjeerd J.
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/06
Dust pollution from the Sahara and African infant mortality 期刊论文
NATURE SUSTAINABILITY, 2020
作者:  Heft-Neal, Sam;  Burney, Jennifer;  Bendavid, Eran;  Voss, Kara K.;  Burke, Marshall
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/06
Coastal sedimentation across North America doubled in the 20(th) century despite river dams 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Rodriguez, A. B.;  McKee, B. A.;  Miller, C. B.;  Bost, M. C.;  Atencio, A. N.
收藏  |  浏览/下载:8/0  |  提交时间:2020/06/29
Groundwater level observations in 250,000 coastal US wells reveal scope of potential seawater intrusion 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Jasechko, Scott;  Perrone, Debra;  Seybold, Hansjoerg;  Fan, Ying;  Kirchner, James W.
收藏  |  浏览/下载:5/0  |  提交时间:2020/06/29
Rapidly-migrating and internally-generated knickpoints can control submarine channel evolution 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Heijnen, Maarten S.;  Clare, Michael A.;  Cartigny, Matthieu J. B.;  Talling, Peter J.;  Hage, Sophie;  Lintern, D. Gwyn;  Stacey, Cooper;  Parsons, Daniel R.;  Simmons, Stephen M.;  Chen, Ye;  Sumner, Esther J.;  Dix, Justin K.;  Clarke, John E. Hughes
收藏  |  浏览/下载:13/0  |  提交时间:2020/06/22
Origin of interannual variability in global mean sea level 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (25) : 13983-13990
作者:  Hamlington, Benjamin D.;  Piecuch, Christopher G.;  Reager, John T.;  Chandanpurkar, Hrishi;  Frederikse, Thomas;  Nerem, R. Steven;  Fasullo, John T.;  Cheon, Se-Hyeon
收藏  |  浏览/下载:6/0  |  提交时间:2020/06/16
sea level  climate variability  global mean sea level  satellite altimetry  
Global glacier mass changes and their contributions to sea-level rise from 1961 to 2016 (vol 568, pg 382, 2019) 期刊论文
NATURE, 2020, 577 (7792) : E9-E9
作者:  Perkel, Jeffrey M.
收藏  |  浏览/下载:0/0  |  提交时间:2020/07/03
Ongoing AMOC and related sea-level and temperature changes after achieving the Paris targets 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (7) : 672-+
作者:  Sigmond, Michael;  Fyfe, John C.;  Saenko, Oleg A.;  Swart, Neil C.
收藏  |  浏览/下载:11/0  |  提交时间:2020/06/09