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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 local Last Glacial Maximum in McMurdo Sound, Antarctica: Implications for ice-sheet behavior in the Ross Sea Embayment 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (1-2) : 31-47
作者:  Christ, Andrew J.;  Bierman, Paul R.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
On the fine vertical structure of the low troposphere over the coastal margins of East Antarctica 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2019, 19 (7) : 4659-4683
作者:  Vignon, Etienne;  Traulle, Olivier;  Berne, Alexis
收藏  |  浏览/下载:5/0  |  提交时间:2019/11/26
Comparison of Antarctic polar stratospheric cloud observations by ground-based and space-borne lidar and relevance for chemistry-climate models 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2019, 19 (2) : 955-972
作者:  Snels, Marcel;  Scoccione, Andrea;  Di Liberto, Luca;  Colao, Francesco;  Pitts, Michael;  Poole, Lamont;  Deshler, Terry;  Cairo, Francesco;  Cagnazzo, Chiara;  Fierli, Federico
收藏  |  浏览/下载:5/0  |  提交时间:2019/04/09
The importance of blowing snow to halogen-containing aerosol in coastal Antarctica: influence of source region versus wind speed 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2018, 18 (22) : 16689-16711
作者:  Giordano, Michael R.;  Kalnajs, Lars E.;  Goetz, J. Douglas;  Avery, Anita M.;  Katz, Erin;  May, Nathaniel W.;  Leemon, Anna;  Mattson, Claire;  Pratt, Kerri A.;  DeCarlo, Peter F.
收藏  |  浏览/下载:5/0  |  提交时间:2019/04/09
Polar stratospheric cloud climatology based on CALIPSO spaceborne lidar measurements from 2006 to 2017 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2018, 18 (15) : 10881-10913
作者:  Pitts, Michael C.;  Poole, Lamont R.;  Gonzalez, Ryan
收藏  |  浏览/下载:17/0  |  提交时间:2019/04/09
High summertime aerosol organic functional group concentrations from marine and seabird sources at Ross Island, Antarctica, during AWARE 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2018, 18 (12) : 8571-8587
作者:  Liu, Jun;  Dedrick, Jeramy;  Russell, Lynn M.;  Senum, Gunnar I.;  Uin, Janek;  Kuang, Chongai;  Springston, Stephen R.;  Leaitch, W. Richard;  Aiken, Allison C.;  Lubin, Dan
收藏  |  浏览/下载:15/0  |  提交时间:2019/04/09
Seasonal variations in physical characteristics of aerosol particles at the King Sejong Station, Antarctic Peninsula 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2017, 17 (21)
作者:  Kim, Jaeseok;  Yoon, Young Jun;  Gim, Yeontae;  Kang, Hyo Jin;  Choi, Jin Hee;  Park, Ki-Tae;  Lee, Bang Yong
收藏  |  浏览/下载:6/0  |  提交时间:2019/04/09
Luminescence dating of paleolake deltas and glacial deposits in Garwood Valley, Antarctica: Implications for climate, Ross ice sheet dynamics, and paleolake duration 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2017, 129
作者:  Levy, Joseph S.;  39;Connor, Jim E.
收藏  |  浏览/下载:2/0  |  提交时间:2019/04/09
Microbial formation of labile organic carbon in Antarctic glacial environments 期刊论文
NATURE GEOSCIENCE, 2017, 10 (5)
作者:  Smith, H. J.;  Foster, R. A.;  McKnight, D. M.;  Lisle, J. T.;  Littmann, S.;  Kuypers, M. M. M.;  Foreman, C. M.
收藏  |  浏览/下载:1/0  |  提交时间:2019/04/09