Rapid ice flow rearrangement induced by subglacial drainage in West Antarctica
Rapid ice flow rearrangement induced by subglacial drainage in West Antarctica
复制标题
南极洲西部冰下排水引起的快速冰流重新排列
DOI：
10.1002/2016gl070430
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发表时间：
2016
影响因子：
5.2
通讯作者：
J. Suckale
中科院分区：
文献类型：
--
作者：
Cooper W. Elsworth;J. Suckale
冰流是快速冰流的走廊，将冰盖排干。它们可以在每年到百年的时间尺度上表现出惊人的空间变异性。我们认为，在冰下排水的融水的变化可能会导致这些突然重新排列的冰流。我们开发了一个二维的，热力学模型表示冰流横截面，并将其耦合到一个空间可变的融水流入的塑性变形床。我们发现，在冰流动的变形沉积物，缺乏显着的地形控制，冰下排水的效率施加直接控制的速度，位置和冰流的宽度。这意味着米级的融水渗透可能对大陆尺度冰盖冰损失的短期变化产生重大影响。我们验证了我们的模型对以前的分析结果，并验证它对西南极洲的Siple海岸的表面观测。
Ice streams are corridors of rapid ice flow draining the ice sheets. They can exhibit astonishing spatial variability on annual to centennial time scales. We propose that changes in the subglacial drainage of meltwater could induce these sudden rearrangements of ice streams. We develop a two‐dimensional, thermomechanical model representing an ice stream cross section and couple it to a plastically deforming bed with spatially variable meltwater influx. We find that where ice flows over deformable sediments and lacks significant topographic control, the efficiency of subglacial water drainage exerts direct control on the velocity, location, and width of ice streams. This implies that meltwater percolation at the meter scale could have a significant effect on the short‐term variability in ice loss from a continental‐scale ice sheet. We verify our model against previous analytical results and validate it against surface observations from the Siple Coast of West Antarctica.
DOI：
10.1029/2012jf002570
发表时间：
2013-03
期刊：
Journal of Geophysical Research: Earth Surface
影响因子：
--
作者：
N. Wel;P. Christoffersen;M. Bougamont
通讯作者：
N. Wel;P. Christoffersen;M. Bougamont
影响因子：
18.3
作者：
Bartholomew, Ian;Nienow, Peter;Sole, Andrew
通讯作者：
Sole, Andrew