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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:19/0  |  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.


  
Warming reaches the South Pole 期刊论文
NATURE CLIMATE CHANGE, 2020
作者:  Stammerjohn, Sharon E.;  Scambos, Ted A.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/06
Particle-Size Distributions and Solubility of Aerosol Iron Over the Antarctic Peninsula During Austral Summer 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (11)
作者:  Gao, Yuan;  Yu, Shun;  Sherrell, Robert M.;  Fan, Songyun;  Bu, Kaixuan;  Anderson, James R.
收藏  |  浏览/下载:13/0  |  提交时间:2020/08/18
aerosol iron  aerosol Fe solubility  aerosol particle size  Antarctic Peninsula  atmospheric iron deposition flux  
Aurora Basin, the Weak Underbelly of East Antarctica 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (9)
作者:  Pelle, Tyler;  Morlighem, Mathieu;  McCormack, Felicity S.
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
Aurora  Antarctica  Totten  modeling  mass  balance  
Detailed quantification of glacier elevation and mass changes in South Georgia 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (3)
作者:  Farias-Barahona, David;  Sommer, Christian;  Sauter, Tobias;  Bannister, Daniel;  Seehaus, Thorsten C.;  Malz, Philipp;  Casassa, Gino;  Mayewski, Paul A.;  Turton, Jenny, V;  Braun, Matthias H.
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/02
glacier mass balance  elevation changes  InSAR  sub-antarctic glaciers  
Deep glacial troughs and stabilizing ridges unveiled beneath the margins of the Antarctic ice sheet 期刊论文
NATURE GEOSCIENCE, 2020, 13 (2) : 132-+
作者:  Morlighem, Mathieu;  Rignot, Eric;  Binder, Tobias;  Blankenship, Donald;  Drews, Reinhard;  Eagles, Graeme;  Eisen, Olaf;  Ferraccioli, Fausto;  Forsberg, Rene;  Fretwell, Peter;  Goel, Vikram;  Greenbaum, Jamin S.;  Gudmundsson, Hilmar;  Guo, Jingxue;  Helm, Veit;  Hofstede, Coen;  Howat, Ian;  Humbert, Angelika;  Jokat, Wilfried;  Karlsson, Nanna B.;  Lee, Won Sang;  Matsuoka, Kenichi;  Millan, Romain;  Mouginot, Jeremie;  Paden, John;  Pattyn, Frank;  Roberts, Jason;  Rosier, Sebastian;  Ruppel, Antonia;  Seroussi, Helene;  Smith, Emma C.;  Steinhage, Daniel;  Sun, Bo;  van den Broeke, Michiel R.;  van Ommen, Tas D.;  van Wessem, Melchior;  Young, Duncan A.
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
Global ocean heat content in the Last Interglacial 期刊论文
NATURE GEOSCIENCE, 2020, 13 (1)
作者:  Shackleton, S.;  Baggenstos, D.;  Menking, J. A.;  Dyonisius, M. N.;  Bereiter, B.;  Bauska, T. K.;  Rhodes, R. H.;  Brook, E. J.;  Petrenko, V. V.;  McConnell, J. R.;  Kellerhals, T.;  Haberli, M.;  Schmitt, J.;  Fischer, H.;  Severinghaus, J. P.
收藏  |  浏览/下载:5/0  |  提交时间:2020/05/13
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
Instantaneous Antarctic ice sheet mass loss driven by thinning ice shelves 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (23) : 13903-13909
作者:  Gudmundsson, G. Hilmar;  Paolo, Fernando S.;  Adusumilli, Susheel;  Fricker, Helen A.
收藏  |  浏览/下载:13/0  |  提交时间:2020/02/17
Glaciology  Antartica  Ice-flow modelling  
Variability of Sediment Accumulation Rates in an Antarctic Fjord 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2019, 46 (22) : 13271-13280
作者:  Eidam, E. F.;  Nittrouer, C. A.;  Lundesgaard, O.;  Homolka, K. K.;  Smith, C. R.
收藏  |  浏览/下载:6/0  |  提交时间:2020/02/17
fjord  sediment  West Antarctic Peninsula  tidewater glacier  radiochronology  accumulation