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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.


  
The increasing likelihood of temperatures above 30 to 40 degrees C in the United Kingdom 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Christidis, Nikolaos;  McCarthy, Mark;  Stott, Peter A.
收藏  |  浏览/下载：14/0  |  提交时间：2020/07/06
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
3D sedimentary architecture showing the inception of an Ice Age 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Loseth, H.;  Dowdeswell, J. A.;  Batchelor, C. L.;  Ottesen, D.
收藏  |  浏览/下载：5/0  |  提交时间：2020/06/16
Ocean and land forcing of the record-breaking Dust Bowl heatwaves across central United States 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Cowan, Tim;  Hegerl, Gabriele C.;  Schurer, Andrew;  Tett, Simon F. B.;  Vautard, Robert;  Yiou, Pascal;  Jezequel, Aglae;  Otto, Friederike E. L.;  Harrington, Luke J.;  Ng, Benjamin
收藏  |  浏览/下载：8/0  |  提交时间：2020/06/16
Rapid range shifts and megafaunal extinctions associated with late Pleistocene climate change 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Seersholm, Frederik V.;  Werndly, Daniel J.;  Grealy, Alicia;  Johnson, Taryn;  Keenan Early, Erin M.;  Lundelius, Ernest L.;  Winsborough, Barbara;  Farr, Grayal Earle;  Toomey, Rickard;  Hansen, Anders J.;  Shapiro, Beth;  Waters, Michael R.;  McDonald, Gregory;  Linderholm, Anna;  Stafford, Thomas W., Jr.;  Bunce, Michael
收藏  |  浏览/下载：8/0  |  提交时间：2020/06/09
An encrusting kleptoparasite-host interaction from the early Cambrian 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Zhang, Zhifei;  Strotz, Luke C.;  Topper, Timothy P.;  Chen, Feiyang;  Chen, Yanlong;  Liang, Yue;  Zhang, Zhiliang;  Skovsted, Christian B.;  Brock, Glenn A.
收藏  |  浏览/下载：9/0  |  提交时间：2020/06/09
Resource stress and subsistence diversification across societies 期刊论文
NATURE SUSTAINABILITY, 2020
作者:  Ember, Carol R.;  Ringen, Erik J.;  Dunnington, Jack;  Pitek, Emily
收藏  |  浏览/下载：2/0  |  提交时间：2020/06/09
Patterns and trends of Northern Hemisphere snow mass from 1980 to 2018 期刊论文
NATURE, 2020, 581 (7808) : 294-+
作者:  Ibrahim, Nizar;  Maganuco, Simone;  Dal Sasso, Cristiano;  Fabbri, Matteo;  Auditore, Marco;  Bindellini, Gabriele;  Martill, David M.;  Zouhri, Samir;  Mattarelli, Diego A.;  Unwin, David M.;  Wiemann, Jasmina;  Bonadonna, Davide;  Amane, Ayoub;  Jakubczak, Juliana;  Joger, Ulrich;  Lauder, George V.;  Pierce, Stephanie E.
收藏  |  浏览/下载：18/0  |  提交时间：2020/05/25

Warming surface temperatures have driven a substantial reduction in the extent and duration of Northern Hemisphere snow cover(1-3). These changes in snow cover affect Earth'  s climate system via the surface energy budget, and influence freshwater resources across a large proportion of the Northern Hemisphere(4-6). In contrast to snow extent, reliable quantitative knowledge on seasonal snow mass and its trend is lacking(7-9). Here we use the new GlobSnow 3.0 dataset to show that the 1980-2018 annual maximum snow mass in the Northern Hemisphere was, on average, 3,062 +/- 35 billion tonnes (gigatonnes). Our quantification is for March (the month that most closely corresponds to peak snow mass), covers non-alpine regions above 40 degrees N and, crucially, includes a bias correction based on in-field snow observations. We compare our GlobSnow 3.0 estimates with three independent estimates of snow mass, each with and without the bias correction. Across the four datasets, the bias correction decreased the range from 2,433-3,380 gigatonnes (mean 2,867) to 2,846-3,062 gigatonnes (mean 2,938)-a reduction in uncertainty from 33% to 7.4%. On the basis of our bias-corrected GlobSnow 3.0 estimates, we find different continental trends over the 39-year satellite record. For example, snow mass decreased by 46 gigatonnes per decade across North America but had a negligible trend across Eurasia  both continents exhibit high regional variability. Our results enable a better estimation of the role of seasonal snow mass in Earth'  s energy, water and carbon budgets.


Applying a bias correction to a state-of-the-art dataset covering non-alpine regions of the Northern Hemisphere and to three other datasets yields a more constrained quantification of snow mass in March from 1980 to 2018.


  
Social-media and newspaper reports reveal large-scale meteorological drivers of floods on Sumatra 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Baranowski, Dariusz B.;  Flatau, Maria K.;  Flatau, Piotr J.;  Karnawati, Dwikorita;  Barabasz, Katarzyna;  Labuz, Michal;  Latos, Beata;  Schmidt, Jerome M.;  Paski, Jaka A., I;  Marzuki
收藏  |  浏览/下载：9/0  |  提交时间：2020/05/20