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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.


  
Changes of Emission Sources to Nitrate Aerosols in Beijing After the Clean Air Actions: Evidence From Dual Isotope Compositions 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (12)
作者:  Fan, Mei-Yi;  Zhang, Yan-Lin;  Lin, Yu-Chi;  Cao, Fang;  Zhao, Zhu-Yu;  Sun, Yele;  Qiu, Yanmei;  Fu, Pingqing;  Wang, Yuxuan
收藏  |  浏览/下载:13/0  |  提交时间:2020/08/18
nitrate aerosols  haze events  stable isotopes  formation mechanism  source apportionment  
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
Impact of Afforestation on Atmospheric Recharge to Groundwater in a Semiarid Area 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (9)
作者:  Huang, Tianming;  Pang, Zhonghe;  Yang, Shuo;  Yin, Lihe
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
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:10/0  |  提交时间:2020/05/20
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  
Diminishing CO2-driven gains in water-use efficiency of global forests 期刊论文
NATURE CLIMATE CHANGE, 2020, 10 (5) : 466-+
作者:  Adams, Mark A.;  Buckley, Thomas N.;  Turnbull, Tarryn L.
收藏  |  浏览/下载:7/0  |  提交时间:2020/05/13
Quantifying the Controls on Evapotranspiration Partitioning in the Highest Alpine Meadow Ecosystem 期刊论文
WATER RESOURCES RESEARCH, 2020, 56 (4)
作者:  Cui, Jiangpeng;  Tian, Lide;  Wei, Zhongwang;  Huntingford, Chris;  Wang, Pei;  Cai, Zhongyin;  Ma, Ning;  Wang, Lixin
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
chamber  evapotranspiration partitioning  leaf area index  soil water content  stable isotopes  Tibetan Plateau  
Variability of Isotope Composition of Precipitation in the Southeastern Tibetan Plateau from the Synoptic to Seasonal Time Scale 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (6)
作者:  Shi, Xiaoyi;  Risi, Camille;  Pu, Tao;  Lacour, Jean-Lionel;  Kong, Yanlong;  Wang, Ke;  He, Yuanqing;  Xia, Dunsheng
收藏  |  浏览/下载:9/0  |  提交时间:2020/07/02
precipitation isotopes  vapor isotopes  isotopic modeling  Tibetan Plateau  
Long-term ecological consequences of forest fires in the continuous permafrost zone of Siberia 期刊论文
ENVIRONMENTAL RESEARCH LETTERS, 2020, 15 (3)
作者:  Kirdyanov, Alexander, V;  Saurer, Matthias;  Siegwolf, Rolf;  Knorre, Anastasia A.;  Prokushkin, Anatoly S.;  (Sidorova), Olga V. Churakova;  Fonti, Marina, V;  Buentgen, Ulf
收藏  |  浏览/下载:14/0  |  提交时间:2020/07/02
active soil layer  boreal forest  permafrost  Siberia  stable isotopes  tree rings  wildfire