West Antarctic Ice Sheet retreat driven by Holocene warm water incursions.
West Antarctic Ice Sheet retreat driven by Holocene warm water incursions.
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DOI：
10.1038/nature22995
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发表时间：
2017-07-05
期刊：
影响因子：
64.8
通讯作者：
Kuhn G
中科院分区：
文献类型：
--
作者：
Hillenbrand CD;Smith JA;Hodell DA;Greaves M;Poole CR;Kender S;Williams M;Andersen TJ;Jernas PE;Elderfield H;Klages JP;Roberts SJ;Gohl K;Larter RD;Kuhn G
冰川学和海洋学观测与数值模式相结合表明，温暖的绕极深水（CDW）上涌到西南极大陆架上导致浮冰架底部融化。由于这些冰架支撑着冰川，海洋导致的冰架变薄导致了今天南极冰盖的消失。在这里，我们提出了第一个多代理数据为基础的重建CDW流入阿蒙森海部门，最脆弱的部分，南极西部冰盖，在过去的11,000年的变化。海洋沉积物中有孔虫壳和底栖有孔虫组合的化学成分表明，增强的CDW上升流，南半球西风的纬度位置控制，迫使这一部门的冰川消退，直到7,500年前，当冰架崩溃可能导致快速冰盖变薄进一步上游，并自20世纪40年代。这些结果增加了对当前冰盖模型预测能力的信心。
Glaciological and oceanographic observations coupled with numerical models show that warm Circumpolar Deep Water (CDW) upwelling onto the West Antarctic continental shelf causes melting of the undersides of floating ice shelves. Because these ice shelves buttress glaciers feeding into them, their ocean-induced thinning is driving Antarctic ice-sheet loss today. Here we present the first multi-proxy data based reconstruction of variability in CDW inflow to the Amundsen Sea sector, the most vulnerable part of the West Antarctic Ice Sheet, during the last 11,000 years. The chemical composition of foraminifer shells and benthic foraminifer assemblages in marine sediments indicate that enhanced CDW upwelling, controlled by the latitudinal position of the Southern Hemisphere westerly winds, forced deglaciation of this sector both until 7,500 years ago, when an ice-shelf collapse may have caused rapid ice-sheet thinning further upstream, and since the 1940s. These results increase confidence in the predictive capability of current ice-sheet models.
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影响因子：
64.8
作者：
DeConto, Robert M.;Pollard, David
通讯作者：
Pollard, David
影响因子：
30.7
作者：
Favier, L.;Durand, G.;Le Brocq, A. M.
通讯作者：
Le Brocq, A. M.
影响因子：
--
作者：
Curry, WB;Oppo, DW
通讯作者：
Oppo, DW
影响因子：
56.9
作者：
Elderfield, H.;Ferretti, P.;Piotrowski, A. M.
通讯作者：
Piotrowski, A. M.
影响因子：
3.5
作者：
Greaves, M.;Caillon, N.;Wilson, P. A.
通讯作者：
Wilson, P. A.