PHYSICAL CONDITIONS AT THE BASE OF A FAST MOVING ANTARCTIC ICE STREAM
PHYSICAL CONDITIONS AT THE BASE OF A FAST MOVING ANTARCTIC ICE STREAM
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DOI：
10.1126/science.248.4951.57
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发表时间：
1990-04-06
期刊：
影响因子：
56.9
通讯作者：
FAHNESTOCK, M
中科院分区：
文献类型：
--
作者：
ENGELHARDT, H;HUMPHREY, N;FAHNESTOCK, M
在南极西部冰盖B冰流底部钻探的钻孔显示，冰流底部处于熔点，基底水压力在冰覆盖压力的1.6巴范围内。这些条件允许快速的冰流运动通过基底滑动或冰下至少2米厚的未固结沉积物的剪切变形发生。冰流的机制在冰盖对气候变化的反应中起着重要作用。
Boreholes drilled to the bottom of ice stream B in the West Antarctic Ice Sheet reveal that the base of the ice stream is at the melting point and the basal water pressure is within about 1.6 bars of the ice overburden pressure. These conditions allow the rapid ice streaming motion to occur by basal sliding or by shear deformation of unconsolidated sediments that underlie the ice in a layer at least 2 meters thick. The mechanics of ice streaming plays a role in the response of the ice sheet to climatic change.