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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.


  
Prolonged Periodicity and Eastward Shift of the January North Pacific Oscillation Since the Mid-1990s and Its Linkage With Sea Ice Anomalies in the Barents Sea 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Xu, Zhiqing;  Fan, Ke
收藏  |  浏览/下载:10/0  |  提交时间:2020/08/18
January North Pacific Oscillation  prolonged periodicity  eastward shift  sea ice anomalies in the Barents Sea  the mid-1990s  
Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner-Ronne Ice Shelf in 2017 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Ryan, Svenja;  Hellmer, Hartmut H.;  Janout, Markus;  Darelius, Elin;  Vignes, Lucie;  Schroeder, Michael
收藏  |  浏览/下载:11/0  |  提交时间:2020/06/16
ocean-ice shelf interaction  Weddell Sea  warm inflow  Antarctic Slope Front  Filchner-Ronne Ice Shelf  
A Mechanism for the Arctic Sea Ice Spring Predictability Barrier 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Bushuk, Mitchell;  Winton, Michael;  Bonan, David B.;  Blanchard-Wrigglesworth, Edward;  Delworth, Thomas L.
收藏  |  浏览/下载:10/0  |  提交时间:2020/06/16
regional Arctic sea ice  seasonal predictability  mass budget  large ensembles  
Ice Breakup Controls Dissipation of Wind Waves Across Southern Ocean Sea Ice 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Ardhuin, Fabrice;  Otero, Mark;  Merrifield, Sophia;  Grouazel, Antoine;  Terrill, Eric
收藏  |  浏览/下载:7/0  |  提交时间:2020/06/16
sea ice  ocean waves  SAR  
Short-term Impacts of Arctic Summer Cyclones on Sea Ice Extent in the Marginal Ice Zone 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Finocchio, Peter M.;  Doyle, James D.;  Stern, Daniel P.;  Fearon, Matthew G.
收藏  |  浏览/下载:11/0  |  提交时间:2020/06/16
Arctic cyclones  sea ice  reanalysis  statistical analysis  melt season  synoptic storms  
Role of Atmospheric Variability in Driving the "Warm-Arctic, Cold-Continent" Pattern Over the North America Sector and Sea Ice Variability Over the Chukchi-Bering Sea 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Guan, Weina;  Jiang, Xianan;  Ren, Xuejuan;  Chen, Gang;  Ding, Qinghua
收藏  |  浏览/下载:15/0  |  提交时间:2020/06/09
Arctic warming  surface air temperature  sea ice loss  atmospheric variability  large-scale circulation  
Limited Retreat of the Wilkes Basin Ice Sheet During the Last Interglacial 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Sutter, J.;  Eisen, O.;  Werner, M.;  Grosfeld, K.;  Kleiner, T.;  Fischer, H.
收藏  |  浏览/下载:7/0  |  提交时间:2020/06/01
Sea Level  Warmer Worlds  Antarctica  Last Interglacial  Paleoclimate  Ice core  
Arctic Reactive Bromine Events Occur in Two Distinct Sets of Environmental Conditions: A Statistical Analysis of 6 Years of Observations 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (10)
作者:  Swanson, William F.;  Graham, Kelly A.;  Halfacre, John W.;  Holmes, Christopher D.;  Shepson, Paul B.;  Simpson, William R.
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/02
tropospheric chemistry  Arctic  bromine  statistical analysis  meteorology  sea ice  
North Pacific Gyre Oscillation Closely Associated With Spring Arctic Sea Ice Loss During 1998-2016 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (10)
作者:  Yu, Lejiang;  Zhong, Shiyuan;  Vihma, Timo;  Sui, Cuijuan;  Qiu, Yubao;  Liang, Xi
收藏  |  浏览/下载:14/0  |  提交时间:2020/07/02
Arctic sea ice loss  the Arctic Oscillation (AO)  the North Pacific Gyre Oscillation (NPGO)  the Pacific Decadal Oscillation (PDO)