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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:21/0  |  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.


  
Record warming at the South Pole during the past three decades 期刊论文
NATURE CLIMATE CHANGE, 2020
作者:  Clem, Kyle R.;  Fogt, Ryan L.;  Turner, John;  Lintner, Benjamin R.;  Marshall, Gareth J.;  Miller, James R.;  Renwick, James A.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/06
Increased melting level height impacts surface precipitation phase and intensity 期刊论文
NATURE CLIMATE CHANGE, 2020
作者:  Prein, Andreas F.;  Heymsfield, Andrew J.
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/06
Emergent constraints on future projections of the western North Pacific Subtropical High 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Chen, Xiaolong;  Zhou, Tianjun;  Wu, Peili;  Guo, Zhun;  Wang, Minghuai
收藏  |  浏览/下载:7/0  |  提交时间:2020/06/09
Controls on surface water carbonate chemistry along North American ocean margins 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Cai, Wei-Jun;  Xu, Yuan-Yuan;  Feely, Richard A.;  Wanninkhof, Rik;  Jonsson, Bror;  Alin, Simone R.;  Barbero, Leticia;  Cross, Jessica N.;  Azetsu-Scott, Kumiko;  Fassbender, Andrea J.;  Carter, Brendan R.;  Jiang, Li-Qing;  Pepin, Pierre;  Chen, Baoshan;  Hussain, Najid;  Reimer, Janet J.;  Xue, Liang;  Salisbury, Joseph E.;  Martin Hernandez-Ayon, Jose;  Langdon, Chris;  Li, Qian;  Sutton, Adrienne J.;  Chen, Chen-Tung A.;  Gledhill, Dwight K.
收藏  |  浏览/下载:14/0  |  提交时间:2020/06/09
Increased drought severity tracks warming in the United States' largest river basin 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (21) : 11328-11336
作者:  Martin, Justin T.;  Pederson, Gregory T.;  Woodhouse, Connie A.;  Cook, Edward R.;  McCabe, Gregory J.;  Anchukaitis, Kevin J.;  Wise, Erika K.;  Erger, Patrick J.;  Dolan, Larry;  McGuire, Marketa;  Gangopadhyay, Subhrendu;  Chase, Katherine J.;  Littell, Jeremy S.;  Gray, Stephen T.;  George, Scott St.;  Friedman, Jonathan M.;  Sauchyn, David J.;  St-Jacques, Jeannine-Marie;  King, John
收藏  |  浏览/下载:14/0  |  提交时间:2020/05/13
drought severity  streamflow  temperature  precipitation  water resources  
Impacts of Using State-of-the-Art Multivariate Bias Correction Methods on Hydrological Modeling Over North America 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (5)
作者:  Guo, Qiang;  Chen, Jie;  Zhang, Xunchang John;  Xu, Chong-Yu;  Chen, Hua
收藏  |  浏览/下载:10/0  |  提交时间:2020/05/13
multivariate bias correction methods  hydrological modeling  intervariable correlation  climate regimes  North America  
Synchronized tropical Pacific and extratropical variability during the past three decades 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (5) : 422-+
作者:  Yang, Jun-Chao;  Lin, Xiaopei;  Xie, Shang-Ping;  Zhang, Yu;  Kosaka, Yu;  Li, Ziguang
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/13
Half-precessional cycle of thermocline temperature in the western equatorial Pacific and its bihemispheric dynamics 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (13) : 7044-7051
作者:  Jian, Zhimin;  Wang, Yue;  Dang, Haowen;  Lea, David W.;  Liu, Zhengyu;  Jin, Haiyan;  Yin, Yaqian
收藏  |  浏览/下载:8/0  |  提交时间:2020/05/13
thermocline temperature  half-precession  western equatorial Pacific  meridional gradient  
Climate effects of aerosols reduce economic inequality 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (3) : 220-+
作者:  Zheng, Yixuan;  Davis, Steven J.;  Persad, Geeta G.;  Caldeira, Ken
收藏  |  浏览/下载:8/0  |  提交时间:2020/05/13