Evidence for subglacial water transport in the West Antarctic Ice Sheet through three‐dimensional satellite radar interferometry
Evidence for subglacial water transport in the West Antarctic Ice Sheet through three‐dimensional satellite radar interferometry
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DOI：
10.1029/2004gl021387
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发表时间：
2004-05
影响因子：
5.2
通讯作者：
L. Gray;I. Joughin;S. Tulaczyk;V. B. Spikes;R. Bindschadler;K. Jezek
中科院分区：
文献类型：
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作者：
L. Gray;I. Joughin;S. Tulaczyk;V. B. Spikes;R. Bindschadler;K. Jezek
1997年南极测绘使命的雷达卫星数据被用于干涉测量，以解决在南极西部冰盖（WAIS）内部的三维表面冰运动。1997年9月26日至10月18日期间，卡姆布冰流支流的一片面积为125平方公里的区域垂直向下塌陷了150厘米。宾德夏德勒冰流的地区也表现出相当的向上和向下的表面位移。由于隆起和沉降特征对应于基底水明显经历水力势井的地点，我们建议冰下水的瞬时运动是垂直表面位移的最可能原因。这些结果以及相关的激光雷达观测结果表明，对冰面高程变化进行成像可以帮助揭示水在难以观察的冰下环境中的关键作用，以及它对冰动力学的重要影响。
RADARSAT data from the 1997 Antarctic Mapping Mission are used interferometrically to solve for the 3‐dimensional surface ice motion in the interior of the West Antarctic Ice Sheet (WAIS). An area of ∼125 km2 in a tributary of the Kamb Ice Stream slumped vertically downwards by up to ∼50 cm between September 26 and October 18, 1997. Areas in the Bindschadler Ice Stream also exhibited comparable upward and downward surface displacements. As the uplift and subsidence features correspond to sites at which the basal water apparently experiences a hydraulic potential well, we suggest transient movement of pockets of subglacial water as the most likely cause for the vertical surface displacements. These results, and related lidar observations, imply that imaging the change in ice surface elevation can help reveal the key role of water in the difficult‐to‐observe subglacial environment, and its important influence on ice dynamics.