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七国集团启动关键矿产行动计划 快报文章
地球科学快报,2025年第12期
作者:  刘学
Microsoft Word(18Kb)  |  收藏  |  浏览/下载:412/0  |  提交时间:2025/06/25
G7  Critical Minerals  
《跟踪SDG7:2023年能源进展报告》发布 快报文章
资源环境快报,2023年第12期
作者:  牛艺博
Microsoft Word(22Kb)  |  收藏  |  浏览/下载:587/0  |  提交时间:2023/06/29
SDG7  Energy  Progress Report  
当前取得的能源进展不足以实现可持续发展目标7 快报文章
气候变化快报,2023年第12期
作者:  秦冰雪
Microsoft Word(15Kb)  |  收藏  |  浏览/下载:581/0  |  提交时间:2023/06/20
Energy  SDG 7  
G7领导人峰会发布《G7清洁能源经济行动计划》 快报文章
气候变化快报,2023年第11期
作者:  秦冰雪
Microsoft Word(14Kb)  |  收藏  |  浏览/下载:574/0  |  提交时间:2023/06/05
Clean Energy  G7  
德国观察就日本广岛气候和能源议程推进献言献策 快报文章
气候变化快报,2023年第2期
作者:  秦冰雪
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Climate  Energy  G7  
德国观察就日本广岛气候和能源议程推进献言献策 快报文章
气候变化快报,2023年第2期
作者:  秦冰雪
Microsoft Word(16Kb)  |  收藏  |  浏览/下载:593/0  |  提交时间:2023/01/19
Climate  Energy  G7  
国际可再生能源机构提出七国集团加速氢能部署的行动建议 快报文章
气候变化快报,2022年第23期
作者:  秦冰雪
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Hydrogen  G7  
国际能源署为七国集团实现重工业净零排放提出建议 快报文章
气候变化快报,2022年第11期
作者:  裴惠娟
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G7  Heavy Industry Sectors  Net Zero  
IISD为实现净零排放的五项优先行动制定全球路线图 快报文章
资源环境快报,2021年第19期
作者:  牛艺博
Microsoft Word(25Kb)  |  收藏  |  浏览/下载:692/0  |  提交时间:2021/10/15
SDG 7  Net Zero Emissions  Priority Actions  Global Roadmap  
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:58/0  |  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.