Increased ice flow in Western Palmer Land linked to ocean melting
Increased ice flow in Western Palmer Land linked to ocean melting
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DOI：
10.1002/2016gl072110
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发表时间：
2017-05-16
影响因子：
5.2
通讯作者：
Wuite, Jan
中科院分区：
文献类型：
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作者：
Hogg, Anna E.;Shepherd, Andrew;Wuite, Jan
西帕尔默地质量和体积的减少增加了南极洲这一海洋区域冰速增加的前景。为了评估这种可能性，我们使用卫星图像和优化的建模方法测量了25年的冰速度。30多个无名的出口冰川以0.5至2.5米/天的速度排出西帕尔默地800公里长的海岸线，其间点缀着近乎停滞的冰。在1992年至2015年期间，大多数出口冰川的速度增加了0.2至0.3米/天，导致冰流量增加了13%，整个地区的冰流量增加了15公里/年。在冰川位于海平面以下300米以上的地方，加速是最大的，这与在温暖的环极水域变浅的地区，冰架变薄造成的支撑作用的丧失是一致的。
A decrease in the mass and volume of Western Palmer Land has raised the prospect that ice speed has increased in this marine-based sector of Antarctica. To assess this possibility, we measure ice velocity over 25years using satellite imagery and an optimized modeling approach. More than 30 unnamed outlet glaciers drain the 800km coastline of Western Palmer Land at speeds ranging from 0.5 to 2.5m/d, interspersed with near-stagnant ice. Between 1992 and 2015, most of the outlet glaciers sped up by 0.2 to 0.3m/d, leading to a 13% increase in ice flow and a 15km(3)/yr increase in ice discharge across the sector as a whole. Speedup is greatest where glaciers are grounded more than 300m below sea level, consistent with a loss of buttressing caused by ice shelf thinning in a region of shoaling warm circumpolar water.