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首页> 外文期刊>Journal of Glaciology >Five decades of shrinkage of July 1st glacier, Qiiian Shan, China
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Five decades of shrinkage of July 1st glacier, Qiiian Shan, China

机译:7月1日的冰川萎缩了五十年,中国祁连山

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摘要

A survey of July 1st glacier, Qiiian Shan, China, was carried out in 2002. Previously, the glacier's boundary had been recorded in 1956, and further research had been carried out in the mid-1970s and 1980s. Our survey reveals that area shrinkage and surface lowering have accelerated in the past 15 years. Surface elevation changes can result from changes in accumulation, surface melting and emergence velocity. The contributions of these elements to surface lowering are evaluated at the lower part of the glacier from observations of surface velocity, ice thickness and precipitation, and from temperature data near the glacier. Apart from the effect of glacier ice redistribution, our analysis reveals quantitatively that the recent accelerated glacier shrinkage has been caused by increasing temperature. Furthermore, it is established that meltwater discharge from the glacier in the past 17 years has increased due to glacier shrinkage, by about 50% over that from 1975 to 1985.
机译:2002年对中国祁连山7月1日冰川进行了一次调查。此前,冰川边界已于1956年记录下来,并在1970年代中期和1980年代进行了进一步研究。我们的调查显示,在过去15年中,面积收缩和表面降低速度加快了。表面高度的变化可能是由堆积,表面融化和出现速度的变化引起的。通过观察表面速度,冰厚度和降水以及冰川附近的温度数据,可以评估这些元素对冰川下部的贡献。除了冰川冰重新分布的影响外,我们的分析还定量地表明,近期冰川加速收缩是由温度升高引起的。此外,可以确定的是,在过去的17年中,由于冰川的收缩,冰川的融水排放量有所增加,比1975年至1985年增加了约50%。

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