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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.


  
Stable isotopes show that earthquakes enhance permeability and release water from mountains 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Hosono, Takahiro;  Yamada, Chisato;  Manga, Michael;  Wang, Chi-Yuen;  Tanimizu, Masaharu
收藏  |  浏览/下载:11/0  |  提交时间:2020/06/09
Deposition, recycling, and archival of nitrate stable isotopes between the air-snow interface: comparison between Dronning Maud Land and Dome C, Antarctica 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (9) : 5861-5885
作者:  Winton, V. Holly L.;  Ming, Alison;  Caillon, Nicolas;  Hauge, Lisa;  Jones, Anna;  Savarino, Joel;  Yang, Xin;  Frey, Markus M.
收藏  |  浏览/下载:11/0  |  提交时间:2020/05/20
Characterising the levels and sources of the historical metal contamination in the atmosphere of Montreal (Canada) from 1973 to 2013 by coupling chemistry and Lead and Osmium isotope ratios 期刊论文
ATMOSPHERIC RESEARCH, 2020, 235
作者:  Bagur, M.;  Widory, D.
收藏  |  浏览/下载:0/0  |  提交时间:2020/07/02
Isotopic interaction and source moisture control on the isotopic composition of rainfall over the Bay of Bengal 期刊论文
ATMOSPHERIC RESEARCH, 2020, 235
作者:  Sinha, Nitesh;  Chakraborty, S.
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Rain isotopes  Rain-vapor interaction  Bay of Bengal  
Iron isotope fractionation at the core-mantle boundary by thermodiffusion 期刊论文
NATURE GEOSCIENCE, 2020, 13 (5)
作者:  Lesher, Charles E.;  Dannberg, Juliane;  Barfod, Gry H.;  Bennett, Neil R.;  Glessner, Justin J. G.;  Lacks, Daniel J.;  Brenan, James M.
收藏  |  浏览/下载:4/0  |  提交时间:2020/05/13
Temporal variation in I-129 and I-127 in aerosols from Xi'an, China: influence of East Asian monsoon and heavy haze events 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (4) : 2623-2635
作者:  Zhang, Luyuan;  Hou, Xiaolin;  Xu, Sheng;  Feng, Tian;  Cheng, Peng;  Fu, Yunchong;  Chen, Ning
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/02
Isotopic evidence for quasi-equilibrium chemistry in thermally mature natural gases 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (8) : 3989-3995
作者:  Thiagarajan, Nivedita;  Xie, Hao;  Ponton, Camilo;  Kitchen, Nami;  Peterson, Brian;  Lawson, Michael;  Formolo, Michael;  Xiao, Yitian;  Eiler, John
收藏  |  浏览/下载:7/0  |  提交时间:2020/05/13
stable isotopes  compound-specific isotope analysis  clumped isotopes  natural gas  methane  
Beyond Turnover Time: Constraining the Lifetime Distribution of Water Vapor from Simple and Complex Approaches 期刊论文
JOURNAL OF THE ATMOSPHERIC SCIENCES, 2020, 77 (2) : 413-433
作者:  Sodemann, Harald
收藏  |  浏览/下载:10/0  |  提交时间:2020/07/02
Atmosphere  Hydrologic cycle  Precipitation  Water budget  balance  Water vapor  
Global warming accelerates uptake of atmospheric mercury in regions experiencing glacier retreat 期刊论文
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 2020, 117 (4) : 2049-2055
作者:  Wang, Xun;  Luo, Ji;  Yuan, Wei;  Lin, Che-Jen;  Wang, Feiyue;  Liu, Chen;  Wang, Genxu;  Feng, Xinbin
收藏  |  浏览/下载:7/0  |  提交时间:2020/05/13
global warming  glacier retreat  atmospheric mercury deposition