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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:61/0  |  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.


  
Constraining the Age and Evolution of the Tuaheni Landslide Complex, Hikurangi Margin, New Zealand, Using Pore-Water Geochemistry and Numerical Modeling 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (11)
作者:  Luo, Min;  Torres, Marta E.;  Kasten, Sabine;  Mountjoy, Joshu J.
收藏  |  浏览/下载:25/0  |  提交时间:2020/05/13
Tuaheni Landslide Complex  pore water  transient state  age constraint  Hikurangi Margin  methane cycling  
Dynamics of soil nitrogen cycling and losses under Norway spruce logging residues on a clear-cut 期刊论文
FOREST ECOLOGY AND MANAGEMENT, 2019, 449
作者:  Smolander, Aino;  Tormanen, Tiina;  Kitunen, Veikko;  Lindroos, Antti-Jussi
收藏  |  浏览/下载:16/0  |  提交时间:2019/11/27
Forest soil  Logging residues  N cycling  N losses  Norway spruce  Percolation water  
Industrial characteristics and consumption efficiency from a nexus perspective - Based on Anhui's Empirical Statistics 期刊论文
ENERGY POLICY, 2018, 115: 281-290
作者:  Chen, Zi-yue;  Huang, Zhen-hai;  Nie, Pu-yan
收藏  |  浏览/下载:17/0  |  提交时间:2019/04/09
Energy-water nexus  Input-output analysis  Network analysis  Finn'  s cycling index  
Shifts of growing-season precipitation peaks decrease soil respiration in a semiarid grassland 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (3) : 1001-1011
作者:  Ru, Jingyi;  Zhou, Yaqiong;  Hui, Dafeng;  Zheng, Mengmei;  Wan, Shiqiang
收藏  |  浏览/下载:31/0  |  提交时间:2019/04/09
carbon cycling  climate change  plants  soil  temperate steppe  water  
Stand dynamics modulate water cycling and mortality risk in droughted tropical forest 期刊论文
GLOBAL CHANGE BIOLOGY, 2018, 24 (1) : 249-258
作者:  da Costa, Antonio C. L.;  Rowland, Lucy;  Oliveira, Rafael S.;  Oliveira, Alex A. R.;  Binks, Oliver J.;  Salmon, Yann;  Vasconcelos, Steel S.;  Junior, Joao A. S.;  Ferreira, Leandro V.;  Poyatos, Rafael;  Mencuccini, Maurizio;  Meir, Patrick
收藏  |  浏览/下载:25/0  |  提交时间:2019/04/09
drought  sap flux  transpiration  tree mortality  tropical forest  water cycling  
Physical Controls on Biogeochemical Processes in Intertidal Zones of Beach Aquifers 期刊论文
WATER RESOURCES RESEARCH, 2017, 53 (11)
作者:  Heiss, James W.;  Post, Vincent E. A.;  Laattoe, Tariq;  Russoniello, Christopher J.;  Michael, Holly A.
收藏  |  浏览/下载:16/0  |  提交时间:2019/04/09
beach groundwater circulation  reactive transport modeling  biogeochemical processes  coastal groundwater-surface water interactions  submarine groundwater discharge  nutrient cycling