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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:18/0  |  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.


  
Methylmercury produced in upper oceans accumulates in deep Mariana Trench fauna 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Sun, Ruoyu;  Yuan, Jingjing;  Sonke, Jeroen E.;  Zhang, Yanxu;  Zhang, Tong;  Zheng, Wang;  Chen, Shun;  Meng, Mei;  Chen, Jiubin;  Liu, Yi;  Peng, Xiaotong;  Liu, Congqiang
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/09
A seawater throttle on H-2 production in Precambrian serpentinizing systems 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (26) : 14756-14763
作者:  Tutolo, Benjamin M.;  Seyfried, William E., Jr.;  Tosca, Nicholas J.
收藏  |  浏览/下载:9/0  |  提交时间:2020/06/22
serpentinization  Precambrian  atmosphere redox state  origins of life  
Massive formation of early diagenetic dolomite in the Ediacaran ocean: Constraints on the "dolomite problem" 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (25) : 14005-14014
作者:  Chang, Biao;  Li, Chao;  Liu, Deng;  Foster, Ian;  Tripati, Aradhna;  Lloyd, Max K.;  Maradiaga, Ingrid;  Luo, Genming;  An, Zhihui;  She, Zhenbing;  Xie, Shucheng;  Tong, Jinnan;  Huang, Junhua;  Algeo, Thomas J.;  Lyons, Timothy W.;  Immenhauser, Adrian
收藏  |  浏览/下载:17/0  |  提交时间:2020/06/16
Doushantuo Formation  clumped isotope  early diagenesis  carbonate geochemistry  early oceans  
Water Table Depth and Bedrock Permeability Control Magnitude and Timing of Transpiration-Induced Diel Fluctuations in Groundwater 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (5)
作者:  Harmon, Ryan;  Barnard, Holly R.;  Singha, Kamini
收藏  |  浏览/下载:5/0  |  提交时间:2020/07/02
Inner ear sensory system changes as extinct crocodylomorphs transitioned from land to water 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (19) : 10422-10428
作者:  Schwab, Julia A.;  Young, Mark T.;  Neenan, James M.;  Walsh, Stig A.;  Witmer, Lawrence M.;  Herrera, Yanina;  Allain, Ronan;  Brochu, Christopher A.;  Choiniere, Jonah N.;  Clark, James M.;  Dollman, Kathleen N.;  Etches, Steve;  Fritsch, Guido;  Gignac, Paul M.;  Ruebenstahl, Alexander;  Sachs, Sven;  Turner, Alan H.;  Vignaud, Patrick;  Wilberg, Eric W.;  Xu, Xing;  Zanno, Lindsay E.;  Brusatte, Stephen L.
收藏  |  浏览/下载:9/0  |  提交时间:2020/05/13
bony labyrinth  vestibular system  morphology  thalattosuchia  CT scanning  
On the annual variability of Antarctic aerosol size distributions at Halley Research Station 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (7) : 4461-4476
作者:  Lachlan-Cope, Thomas;  39;Osto, Manuel
收藏  |  浏览/下载:6/0  |  提交时间:2020/05/13
Deep biogenic methane and drilling-associated gas artifacts: Influence on gas-based characterization of petroleum fluids 期刊论文
AAPG BULLETIN, 2020, 104 (4) : 887-912
作者:  Strapoc, Dariusz;  Jacquet, Benjamin;  Torres, Oscar;  Khan, Shahnawaz;  Villegas, Esra Inan;  Albrecht, Heidi;  Okoh, Bruno;  McKinney, Daniel
收藏  |  浏览/下载:8/0  |  提交时间:2020/05/13
Seasonal contrast in size distributions and mixing state of black carbon and its association with PM1.0 chemical composition from the eastern coast of India 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (6) : 3965-3985
作者:  Kompalli, Sobhan Kumar;  Babu, Surendran Nair Suresh;  Satheesh, Sreedharan Krishnakumari;  Moorthy, Krishnaswamy Krishna;  Das, Trupti;  Boopathy, Ramasamy;  Liu, Dantong;  Darbyshire, Eoghan;  Allan, James D.;  Brooks, James;  Flynn, Michael J.;  Coe, Hugh
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/02
The influence of typhoons on atmospheric composition deduced from IAGOS measurements over Taipei 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (6) : 3945-3963
作者:  Roux, Frank;  Clark, Hannah;  Wang, Kuo-Ying;  Rohs, Susanne;  Sauvage, Bastien;  Nedelec, Philippe
收藏  |  浏览/下载:11/0  |  提交时间:2020/07/02