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Fossilized lightning bolts reveal when ancient storms struck 新闻
来源平台:Science. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:1/0  |  提交时间:2020/12/22
Timing of exotic, far-traveled boulder emplacement and paleo-outburstflooding in the central Himalayas 科技报告
来源:European Geosciences Union. 出版年: 2020
作者:  admin
收藏  |  浏览/下载:2/0  |  提交时间:2020/11/09
Current glacier recession causes significant rockfall increase: the immediate paraglacial response of deglaciating cirque walls 科技报告
来源:European Geosciences Union. 出版年: 2020
作者:  admin
收藏  |  浏览/下载:10/0  |  提交时间:2020/10/12
A 6-year lidar survey reveals enhanced rockwall retreat and modified rockfall magnitudes/frequencies in deglaciating cirques 科技报告
来源:European Geosciences Union. 出版年: 2020
作者:  admin
收藏  |  浏览/下载:2/0  |  提交时间:2020/10/12
Rare rowi kiwi dies on road 新闻
来源平台:Department of Conservation. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:10/0  |  提交时间:2020/09/07
Glacier loss will cause water shortages in Alberta: UBC study 新闻
来源平台:Environmental Health News. 发布日期:2020
作者:  admin
收藏  |  浏览/下载:0/0  |  提交时间:2020/08/18
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.


  
Rapid glacier retreat and downwasting throughout the European Alps in the early 21(st) century 期刊论文
NATURE COMMUNICATIONS, 2020, 11 (1)
作者:  Sommer, Christian;  Malz, Philipp;  Seehaus, Thorsten C.;  Lippl, Stefan;  Zemp, Michael;  Braun, Matthias H.
收藏  |  浏览/下载:9/0  |  提交时间:2020/06/29
Tracking the rapid pace of a retreating ice sheet 期刊论文
Science, 2020
作者:  Martin Jakobsson
收藏  |  浏览/下载:6/0  |  提交时间:2020/06/01
Specialized meltwater biodiversity persists despite widespread deglaciation 期刊论文
Proceedings of the National Academy of Sciences, 2020
作者:  Clint C. Muhlfeld;  Timothy J. Cline;  J. Joseph Giersch;  Erich Peitzsch;  Caitlyn Florentine;  Dean Jacobsen;  Scott Hotaling
收藏  |  浏览/下载:5/0  |  提交时间:2020/05/20