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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.


  
Climate From the McMurdo Dry Valleys, Antarctica, 1986-2017: Surface Air Temperature Trends and Redefined Summer Season 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (13)
作者:  Obryk, M. K.;  Doran, P. T.;  Fountain, A. G.;  Myers, M.;  McKay, C. P.
收藏  |  浏览/下载:6/0  |  提交时间:2020/08/18
McMurdo Dry Valleys  weather observations  summer season  
Extreme dry and wet spells face changes in their duration and timing 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (7)
作者:  Breinl, Korbinian;  Di Baldassarre, Giuliano;  Mazzoleni, Maurizio;  Lun, David;  Vico, Giulia
收藏  |  浏览/下载:11/0  |  提交时间:2020/08/18
extreme dry spells  extreme wet spells  change in duration  change in timing  climate change  global analysis  global trends  
Volatility Dependence of the Aerosol Size Distributions of Nonpolar Organic Compounds: A Case Study in Shanghai 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (12)
作者:  Lyu, Yan;  Li, Xiang
收藏  |  浏览/下载:4/0  |  提交时间:2020/08/18
size distribution  volatility  dry deposition  organic aerosols  geometric mean diameter  
全球干旱水域的二氧化碳排放量被低估 快报文章
气候变化快报,2020年第11期
作者:  裴惠娟
Microsoft Word(14Kb)  |  收藏  |  浏览/下载:322/0  |  提交时间:2020/06/04
Dry Inland Waters  CO2 Emissions  Drivers  Ecosystems  
Finding common ground: agreement on increasing wildfire risk crosses political lines 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (6)
作者:  Hartter, Joel;  Hamilton, Lawrence C.;  Ducey, Mark J.;  Boag, Angela E.;  Salerno, Jonathan D.;  Christoffersen, Nils D.;  Oester, Paul T.;  Palace, Michael W.;  Stevens, Forrest R.
收藏  |  浏览/下载:12/0  |  提交时间:2020/08/18
wildfire  forest management  climate change  dry forests  northeast Oregon  
Exploring Abrupt Alternations Between Wet and Dry Conditions on the Basis of Historical Observations and Convection-Permitting Climate Model Simulations 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (9)
作者:  Chen, H.;  Wang, S.;  Wang, Y.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
dry-wet abrupt alternation  convection permitting  extreme event  heavy rainfall  drought  
Influence of Dynamic Ozone Dry Deposition on Ozone Pollution 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (8)
作者:  Clifton, O. E.;  Paulot, F.;  Fiore, A. M.;  Horowitz, L. W.;  Correa, G.;  Baublitz, C. B.;  Fares, S.;  Goded, I.;  Goldstein, A. H.;  Gruening, C.;  Hogg, A. J.;  Loubet, B.;  Mammarella, I.;  Munger, J. W.;  Neil, L.;  Stella, P.;  Uddling, J.;  Vesala, T.;  Weng, E.
收藏  |  浏览/下载:13/0  |  提交时间:2020/07/02
dry deposition  tropospheric ozone  stomatal conductance  earth system modeling  nonstomatal deposition  air pollution  
Domestic well vulnerability to drought duration and unsustainable groundwater management in California's Central Valley 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (4)
作者:  Pauloo, R. A.;  Escriva-Bou, A.;  Dahlke, H.;  Fencl, A.;  Guillon, H.;  Fogg, G. E.
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/02
groundwater  drought  domestic well  well failure  water management  dry well  
Tracer-Aided Modeling in the Low-Relief, Wet-Dry Tropics Suggests Water Ages and DOC Export Are Driven by Seasonal Wetlands and Deep Groundwater 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (4)
作者:  Birkel, Christian;  Duvert, Clement;  Correa, Alicia;  Munksgaard, Niels C.;  Maher, Damien T.;  Hutley, Lindsay B.
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/02
wet-dry tropics  tracer-aided models  water age  DOC  savanna woodland  wetland