Sustained mass loss of the northeast Greenland ice sheet triggered by regional warming
Sustained mass loss of the northeast Greenland ice sheet triggered by regional warming
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DOI：
10.1038/nclimate2161
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发表时间：
2014-04-01
影响因子：
30.7
通讯作者：
Muresan, Ioana S.
中科院分区：
文献类型：
--
作者：
Khan, Shfaqat A.;Kjaer, Kurt H.;Muresan, Ioana S.
格陵兰冰盖是过去20年来全球海平面上升的最大贡献者之一，占3.2毫米/年的0.5毫米/年。这一贡献的很大一部分与格陵兰东南部和西北部冰川数量增加的速度有关。在这里，我们表明，格陵兰岛东北部的冰流，延伸到冰盖内部超过600公里，现在正在经历持续的动态变薄，与区域变暖，经过四分之一以上的世纪的稳定。格陵兰冰盖的这一部分特别令人感兴趣，因为流域盆地面积占冰盖的16%（是雅各布港的两倍），数值模型预测表明这一部分没有重大的质量损失，导致低估了未来全球海平面上升。基岩的几何形状和冰川加速和质量损失的单调趋势表明，在不久的将来，该地区的冰的动态下降将继续。
The Greenland ice sheet has been one of the largest contributors to global sea-level rise over the past 20 years, accounting for 0.5 mm yr(-1) of a total of 3.2 mm yr(-1). A significant portion of this contribution is associated with the speed-up of an increased number of glaciers in southeast and northwest Greenland. Here, we show that the northeast Greenland ice stream, which extends more than 600 km into the interior of the ice sheet, is now undergoing sustained dynamic thinning, linked to regional warming, after more than a quarter of a century of stability. This sector of the Greenland ice sheet is of particular interest, because the drainage basin area covers 16% of the ice sheet (twice that of Jakobshavn Isbrae) and numerical model predictions suggest no significant mass loss for this sector, leading to an under-estimation of future global sea-level rise. The geometry of the bedrock and monotonic trend in glacier speed-up and mass loss suggests that dynamic drawdown of ice in this region will continue in the near future.