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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:21/0  |  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.


  
The timing and compositional evolution of volcanism within northern Harrat Rahat, Kingdom of Saudi Arabia 期刊论文
GEOLOGICAL SOCIETY OF AMERICA BULLETIN, 2020, 132 (7-8) : 1381-1403
作者:  Stelten, Mark E.;  Downs, Drew T.;  Champion, Duane E.;  Dietterich, Hannah R.;  Calvert, Andrew T.;  Sisson, Thomas W.;  Mahood, Gail A.;  Zahran, Hani
收藏  |  浏览/下载:8/0  |  提交时间:2020/08/18
Variability and past long-term changes of brominated very short-lived substances at the tropical tropopause 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (11) : 7103-7123
作者:  Tegtmeier, Susann;  Atlas, Elliot;  Quack, Birgit;  Ziska, Franziska;  Krueger, Kirstin
收藏  |  浏览/下载:6/0  |  提交时间:2020/06/22
A new marine biogenic emission: methane sulfonamide (MSAM), dimethyl sulfide (DMS), and dimethyl sulfone (DMSO2) measured in air over the Arabian Sea 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (10) : 6081-6094
作者:  Edtbauer, Achim;  Stoenner, Christof;  Pfannerstill, Eva;  Berasategui, Matias;  Walter, David;  Crowley, John N.;  Lelieveld, Jos;  Williams, Jonathan
收藏  |  浏览/下载:9/0  |  提交时间:2020/06/01
A 20-Year Climatology of Madden-Julian Oscillation Convection: Large-Scale Precipitation Tracking From TRMM-GPM Rainfall 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (7)
作者:  Kerns, Brandon W.;  Chen, Shuyi S.
收藏  |  浏览/下载:7/0  |  提交时间:2020/07/02
MJO  rainfall  tropical  tracking  
Tritium as a hydrological tracer in Mediterranean precipitation events 期刊论文
ATMOSPHERIC CHEMISTRY AND PHYSICS, 2020, 20 (6) : 3555-3568
作者:  Juhlke, Tobias R.;  Sueltenfuss, Juergen;  Trachte, Katja;  Huneau, Frederic;  Garel, Emilie;  Santoni, Sebastien;  Barth, Johannes A. C.;  van Geldern, Robert
收藏  |  浏览/下载:6/0  |  提交时间:2020/07/02
Ground-Based Observations Reveal Unique Valley Precipitation Patterns in the Central Himalaya 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (5)
作者:  Ouyang, Lin;  Yang, Kun;  Lu, Hui;  Chen, Yingying;  Lazhu;  Zhou, Xu;  Wang, Yan
收藏  |  浏览/下载:8/0  |  提交时间:2020/07/02
precipitation  diurnal cycle  seasonal variation  central Himalaya  
Constraining Reanalysis Snowfall Over the Arctic Ocean Using CloudSat Observations 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (4)
作者:  Cabaj, A.;  Kushner, P. J.;  Fletcher, C. G.;  Howell, S.;  Petty, A. A.
收藏  |  浏览/下载:3/0  |  提交时间:2020/07/02
Projected Future Changes of Meridional Heat Transport and Heat Balance of the Indian Ocean 期刊论文
GEOPHYSICAL RESEARCH LETTERS, 2020, 47 (4)
作者:  Ma, Jie;  Feng, Ming;  Lan, Jian;  Hu, Dunxin
收藏  |  浏览/下载:17/0  |  提交时间:2020/07/02
Evaluation of CloudSat's Cloud-Profiling Radar for Mapping Snowfall Rates Across the Greenland Ice Sheet 期刊论文
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2020, 125 (4)
作者:  Ryan, Jonathan C.;  Smith, Laurence C.;  Wu, Mengxi;  Cooley, Sarah W.;  Miege, Clement;  Montgomery, Lynn N.;  Koenig, Lora S.;  Fettweis, Xavier;  Noel, Brice P. Y.;  van den Broeke, Michiel R.
收藏  |  浏览/下载:12/0  |  提交时间:2020/07/02