Isolated Cavities Dominate Greenland Ice Sheet Dynamic Response to Lake Drainage
Isolated Cavities Dominate Greenland Ice Sheet Dynamic Response to Lake Drainage
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孤立空洞主导格陵兰冰盖对湖泊排水的动态响应
DOI：
10.1029/2021gl094762
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发表时间：
2021
影响因子：
5.2
通讯作者：
T. Dixon
中科院分区：
文献类型：
--
作者：
J. Mejia;J. Gulley;C. Trunz;M. Covington;T. Bartholomaus;Surui Xie;T. Dixon
格陵兰冰盖(GRIS)滑动速度的季节变化是由冰下排水系统对融化水输入的反应调节的。然而，相对于孤立空穴的脱水而言，沟道化在控制季节性冰减速方面的重要性仍然没有得到解决。使用冰运动、Moulin水头和冰川水力震动测量，我们证明了由上冰川上湖排水引发的冰下洪水波的通过减缓了滑动到冬季的背景速度，而没有增加Moulin连接的排水系统的水力容量。我们将这些结果解释为反映了孤立空洞的脱水导致的基础牵引力的增加。这些结果表明，冰下排水系统孤立部分的降水在推动GRIS季节性放缓方面发挥了关键作用。
Seasonal variability in the Greenland Ice Sheet's (GrIS) sliding speed is regulated by the response of the subglacial drainage system to meltwater inputs. However, the importance of channelization relative to the dewatering of isolated cavities in controlling seasonal ice deceleration remains unsolved. Using ice motion, moulin hydraulic head, and glaciohydraulic tremor measurements, we show the passing of a subglacial floodwave triggered by upglacier supraglacial lake drainages slowed sliding to wintertime background speeds without increasing the hydraulic capacity of the moulin‐connected drainage system. We interpret these results to reflect an increase in basal traction caused by the dewatering of isolated cavities. These results suggest the dewatering of isolated parts of the subglacial drainage system play a key role in driving seasonal slowdowns on the GrIS.
影响因子：
18.3
作者：
Chandler, D. M.;Wadham, J. L.;Hubbard, A.
通讯作者：
Hubbard, A.