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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.


  
Fasting season length sets temporal limits for global polar bear persistence 期刊论文
NATURE CLIMATE CHANGE, 2020
作者:  Molnar, Peter K.;  Bitz, Cecilia M.;  Holland, Marika M.;  Kay, Jennifer E.;  Penk, Stephanie R.;  Amstrup, Steven C.
收藏  |  浏览/下载:19/0  |  提交时间:2020/08/09
Cloud phase characteristics over Southeast Asia from A-Train satellite observations 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 8267-8291
作者:  Hong, Yulan;  Di Girolamo, Larry
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/21
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  
Subseasonal Prediction of Land Cold Extremes in Boreal Wintertime 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Xiang, Baoqiang;  Sun, Y. Qiang;  Chen, Jan-Huey;  Johnson, Nathaniel C.;  Jiang, Xianan
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/18
subseasonal prediction  extremes  surface air temperature  predictability sources  land-atmosphere coupling  
Linking Marine Biological Activity to Aerosol Chemical Composition and Cloud-Relevant Properties Over the North Atlantic Ocean 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Mansour, Karam;  39;Dowd, Colin
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/18
aerosol-cloud interactions  CCN  INP  marine aerosol  ocean-atmosphere interactions  oceanic biological activity  
Quantifying the contribution of tropical cyclones to lightning activity over the Northwest Pacific 期刊论文
ATMOSPHERIC RESEARCH, 2020, 239
作者:  Zhang, Wenjuan;  Zhang, Yijun;  Zheng, Dong;  Lyu, Weitao
收藏  |  浏览/下载:9/0  |  提交时间:2020/08/18
Lightning  Tropical cyclone  Contribution  Northwest Pacific  
Combining atmospheric and snow radiative transfer models to assess the solar radiative effects of black carbon in the Arctic 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 8139-8156
作者:  Donth, Tobias;  Jaekel, Evelyn;  Ehrlich, Andre;  Heinold, Bernd;  Schacht, Jacob;  Herber, Andreas;  Zanatta, Marco;  Wendisch, Manfred
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/21
On the climate sensitivity and historical warming evolution in recent coupled model ensembles 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 7829-7842
作者:  Flynn, Clare Marie;  Mauritsen, Thorsten
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/09
Improving the Southern Ocean cloud albedo biases in a general circulation model 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (13) : 7741-7751
作者:  Varma, Vidya;  Morgenstern, Olaf;  Field, Paul;  Furtado, Kalli;  Williams, Jonny;  Hyder, Patrick
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/06