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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:20/0  |  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.


  
A seawater-sulfate origin for early Earth's volcanic sulfur 期刊论文
NATURE GEOSCIENCE, 2020
作者:  Ohmoto, Hiroshi
收藏  |  浏览/下载:3/0  |  提交时间:2020/08/09
Molecular hydrogen in minerals as a clue to interpret partial derivative D variations in the mantle 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Moine, B. N.;  Bolfan-Casanova, N.;  Radu, I. B.;  Ionov, D. A.;  Costin, G.;  Korsakov, A., V;  Golovin, A., V;  Oleinikov, O. B.;  Deloule, E.;  Cottin, J. Y.
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/21
2009-2017 trends of PM10 in the legendary Riotinto mining district of SW Spain 期刊论文
ATMOSPHERIC RESEARCH, 2020, 238
作者:  Sanchez de la Campa, Ana M.;  Sanchez-Rodas, Daniel;  Marquez, Gonzalo;  Romero, Emilio;  de la Rosa, Jesus D.
收藏  |  浏览/下载:7/0  |  提交时间:2020/08/18
Air quality  PM10  Arsenic  Metals  Mine  
A history of pore water oxygen isotope evolution in the Cretaceous Travis Peak Formation in East Texas 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1626-1638
作者:  Denny, Adam C.;  Fall, Andras;  Orland, Ian J.;  Valley, John W.;  Eichhubl, Peter;  Laubach, Stephen E.
收藏  |  浏览/下载:5/0  |  提交时间:2020/08/18
Geomorphological evidence for a dry dust avalanche origin of slope streaks on Mars 期刊论文
NATURE GEOSCIENCE, 2020, 13 (7) : 473-+
作者:  Dundas, Colin M.
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/06
Effect of Fluid Viscosity on Earthquake Nucleation 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (12)
作者:  Cornelio, C.;  Violay, M.
收藏  |  浏览/下载:20/0  |  提交时间:2020/08/18
earthquake nucleation  viscous fluids  boundary lubrication regime  
The Insulating Effect of Methane Clathrate Crust on Titan's Thermal Evolution 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (13)
作者:  Kalousova, Klara;  Sotin, Christophe
收藏  |  浏览/下载:10/0  |  提交时间:2020/06/16
Titan  clathrates  thermal evolution  ocean  
Origin of interannual variability in global mean sea level 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (25) : 13983-13990
作者:  Hamlington, Benjamin D.;  Piecuch, Christopher G.;  Reager, John T.;  Chandanpurkar, Hrishi;  Frederikse, Thomas;  Nerem, R. Steven;  Fasullo, John T.;  Cheon, Se-Hyeon
收藏  |  浏览/下载:6/0  |  提交时间:2020/06/16
sea level  climate variability  global mean sea level  satellite altimetry  
Changes in Soil Cohesion Due to Water Vapor Exchange: A Proposed Dry-Flow Trigger Mechanism for Recurring Slope Lineae on Mars 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
作者:  Gough, R., V;  Nuding, D. L.;  Archer, P. D., Jr.;  Fernanders, M. S.;  Guzewich, S. D.;  Tolbert, M. A.;  Toigo, A. D.
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/25
Mars  recurring slope lineae  water vapor  salt  perchlorate  humidity