Interfacial water in polar glaciers and glacier sliding at -17 °C
Interfacial water in polar glaciers and glacier sliding at -17 °C
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DOI：
10.1029/1999gl900096
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发表时间：
1999-03-15
影响因子：
5.2
通讯作者：
Raymond, CF
中科院分区：
文献类型：
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作者：
Cuffey, KM;Conway, H;Raymond, CF
我们已经观察到在南极洲Meserve冰川下寒冷（-17摄氏度）的冰-岩界面上的滑动，以及在这个冰川肮脏的基底层中冰分离成干净的透镜。我们解释这些表现为薄水膜在冰岩界面。我们使用Shreve的理论，亚冻结滑动估计标称膜厚度至少为几十纳米。这样的水膜应该存在于大多数极地冰的岩石周围，并且可能由于再结晶期间的溶质排斥以及由于与杂质所在的矿脉和晶界的交换而具有高溶质浓度。
We have observed sliding at a cold (-17 degrees C) ice-rock interface beneath Meserve Glacier, Antarctica, and the segregation of ice into clean lenses amidst the dirty basal layers of this glacier. We interpret these as manifestations of thin water films at ice-rock interfaces. We use Shreve's theory for sub-freezing sliding to estimate the nominal film thickness to be at least tens of nanometers. Such water films should exist around rocks in most polar ices, and likely have high solute concentrations due to solute rejection during regelation and due to exchange with veins and grain boundaries where impurities reside.