Superimposed ice in glacier mass balance on the Tibetan Plateau
Superimposed ice in glacier mass balance on the Tibetan Plateau
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DOI：
10.3189/s0022143000003440
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发表时间：
1996
影响因子：
3.4
通讯作者：
K. Fujita;K. Seko;Y. Ageta;J. Pu;Tandong Yao
中科院分区：
文献类型：
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作者：
K. Fujita;K. Seko;Y. Ageta;J. Pu;Tandong Yao
根据1993年夏季在青藏高原中部唐古拉山小东克玛底冰川进行的冰川学观测，探讨了冰川物质平衡与融水再冻结的关系。在这个冰川上，一部分融化的冰川在雪/冰界面重新冻结，形成叠加的冰。叠加成冰量取决于融水补给和冰川温度条件。冰川冰体上的雪层厚度小于2 m，即使在高堆积区也是如此。约60%的融水产生的积累区期间5月至9月被困在雪/冰界面的再冻结，并没有排出冰川。约26%的冰川表面积雪被重新冻结在积雪区的雪/冰界面上。这些事实表明，在低降水条件下，叠加冰的形成是相当重要的冰川保水。
Abstract The relations between mass balance and meltwater refreezing were examined on the basis of glaciological observations carried out in summer 1993 on Xiao Dongkemadi Glacier, Tanggula Mountains, central Tibetan Plateau. On this glacier, a part of meltwaler refreezes at the snow/ice interface as superimposed ice. The amount of superimposed ice formation was determined by both meltwater supply and temperature condition of the glacier. Snow-layer thickness on the glacier ice body is less than 2 m, even in the higher accumulation zone. About 60% of meltwaler generated in the accumulation zone for the period May–September was trapped at the snow/ice interface by refreezing, and was not discharged out of the glacier. About 26% of accumulated snow to the glacier surface was replaced on the snow/ice interface by refreezing in the accumulation zone. These facts indicate that superimposed ice formation is quite significant for water retention in glaciers under low-precipitation conditions.