A model for tidewater glacier undercutting by submarine melting

A model for tidewater glacier undercutting by submarine melting
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海底融化导致潮水冰川底切的模型

DOI:
10.1002/2016gl072374
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发表时间:
2017
影响因子:
5.2
通讯作者:
Slater D
Slater D
中科院分区:
地球科学1区
文献类型:
--
作者:
Slater D

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格陵兰冰盖海洋终止边缘的动态变化可能是由海洋引发的,特别是在冰下径流驱动剧烈的冰缘羽流和快速的海底融化的地方。在这里,我们模拟了海底融化驱动的冰川终端的底切,模拟了一个过程,这是理解冰-海洋耦合的关键。在径流出现广泛的冰下通道,我们发现,底切只有一个微弱的影响,当地的海底融化率,但增加总消融海底融化由于较大的淹没冰表面积。因此,融化的影响不仅取决于融化速率的大小,还取决于冰-海界面的斜率。我们认为,最严重的底切发生在峡湾的最大高度所达到的羽流,可能会促进上面的冰崩解。然而,目前还不清楚底切是否足够迅速地影响格陵兰流动最快的冰川的产犊。
Dynamic change at the marine‐terminating margins of the Greenland Ice Sheet may be initiated by the ocean, particularly where subglacial runoff drives vigorous ice‐marginal plumes and rapid submarine melting. Here we model submarine melt‐driven undercutting of tidewater glacier termini, simulating a process which is key to understanding ice‐ocean coupling. Where runoff emerges from broad subglacial channels we find that undercutting has only a weak impact on local submarine melt rate but increases total ablation by submarine melting due to the larger submerged ice surface area. Thus, the impact of melting is determined not only by the melt rate magnitude but also by the slope of the ice‐ocean interface. We suggest that the most severe undercutting occurs at the maximum height in the fjord reached by the plume, likely promoting calving of ice above. It remains unclear, however, whether undercutting proceeds sufficiently rapidly to influence calving at Greenland's fastest‐flowing glaciers.
根据三维、高分辨率数值模型和海洋观测,格陵兰岛西部斯托尔冰川的水下融化
DOI: --
发表时间: 2013
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