Greenland subglacial drainage evolution regulated by weakly connected regions of the bed.
Greenland subglacial drainage evolution regulated by weakly connected regions of the bed.
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格陵兰冰下排水演化受河床弱连接区域的调节。
DOI：
10.1038/ncomms13903
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发表时间：
2016-12-19
影响因子：
16.6
通讯作者：
中科院分区：
文献类型：
--
作者：
每年夏天，格陵兰冰盖的表面融水渗透到冰盖的底部，由于基底水压升高，导致冰速最初增加，随后在夏末放缓，并持续到秋季和冬季。虽然这种季节性模式通常是由冰下排水系统从一个效率低下的分布到有效的渠道化配置的演变来解释，越来越多的证据表明，冰下渠道无法解释在夏末和秋季的水动力耦合的重要方面。在这里，我们使用数值模型的冰下排水和冰流表明，有限的，逐渐泄漏的水和降低水压弱连接区域的床可以解释的主导功能，在后期和后融季冰动态。这些结果表明，第三弱连接排水组件应包括在冰下水文学的概念模型。 每年夏天，地表融水流入格陵兰冰盖的河床，导致冰流变化，这与当时流行的冰下排水渠化理论不一致。在这里，作者表明，这是由有限的，逐渐泄漏的水从以前被忽视的弱连接区域的床。
Penetration of surface meltwater to the bed of the Greenland Ice Sheet each summer causes an initial increase in ice speed due to elevated basal water pressure, followed by slowdown in late summer that continues into fall and winter. While this seasonal pattern is commonly explained by an evolution of the subglacial drainage system from an inefficient distributed to efficient channelized configuration, mounting evidence indicates that subglacial channels are unable to explain important aspects of hydrodynamic coupling in late summer and fall. Here we use numerical models of subglacial drainage and ice flow to show that limited, gradual leakage of water and lowering of water pressure in weakly connected regions of the bed can explain the dominant features in late and post melt season ice dynamics. These results suggest that a third weakly connected drainage component should be included in the conceptual model of subglacial hydrology. Surface meltwater draining to the bed of the Greenland Ice Sheet each summer causes ice flow changes inconsistent with the prevailing theory of channelizing subglacial drainage. Here, the authors show this is caused by limited, gradual leakage of water from previously ignored weakly connected regions of the bed.
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DOI：
10.1002/2014jf003333
发表时间：
2015-06
期刊：
Journal of geophysical research. Earth surface
影响因子：
--
作者：
Dow CF;Kulessa B;Rutt IC;Tsai VC;Pimentel S;Doyle SH;van As D;Lindbäck K;Pettersson R;Jones GA;Hubbard A
通讯作者：
Hubbard A
影响因子：
3.4
作者：
HUBBARD, BP;SHARP, MJ;SMART, CC
通讯作者：
SMART, CC
影响因子：
3.4
作者：
Gulley, J. D.;Grabiec, M.;Glowacki, P.
通讯作者：
Glowacki, P.
影响因子：
3.9
作者：
Banwell, Alison F.;Willis, Ian C.;Arnold, Neil S.
通讯作者：
Arnold, Neil S.
影响因子：
3.4
作者：
BLATTER, H
通讯作者：
BLATTER, H