Glacier changes since the Little Ice Age maximum in the western Qilian Shan, northwest China, and consequences of glacier runoff for water supply
Glacier changes since the Little Ice Age maximum in the western Qilian Shan, northwest China, and consequences of glacier runoff for water supply
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DOI：
10.3189/172756503781830926
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发表时间：
2003
影响因子：
3.4
通讯作者：
Shiyin Liu;Wenxin Sun;Yongping Shen;L. Gang
中科院分区：
文献类型：
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作者：
Shiyin Liu;Wenxin Sun;Yongping Shen;L. Gang
利用航空摄影、地形图和Landsat-5卫星图像资料，分析了祁连山西部小冰期至1990年的冰川变化。从LIA最大值到1956年，整个研究区域的冰川面积和体积分别减少了15%和18%。这种冰川萎缩的趋势在1956年至1990年期间持续并加速。这些面积和体积的最新下降在34年内约为10%。最近的收缩可能是由于1956- 1966年期间气温升高和降水减少的综合作用，或者是由于1956 - 1990年冰川化高山的持续变暖。因此，1956年至1990年期间，冰川流失造成的冰川径流使所考虑的四个流域的河流径流量增加了6.2立方公里。此外，根据长度小于1 km的小型冰川的平均终点退缩估计的平衡线高度（ELA）上升为46 m，这相当于从LIA到20世纪50年代暖季平均气温上升0.3°C。
Abstract Based on aerial photographs, topographical maps and the Landsat-5 image data, we have analyzed fluctuations of glaciers in the western Qilian Shan, north-west China, from the Little Ice Age (LIA) to 1990. The areas and volumes of glaciers in the whole considered region decreased 15% and 18%, respectively, from the LIA maximum to 1956. This trend of glacier shrinkage continued and accelerated between 1956 and 1990. These latest decreases in area and volume were about 10% in 34 years. The recent shrinkage may be due either to a combination of higher temperatures and lower precipitation during the period 1956–66, or to continuous warming in the high glacierized mountains from 1956 to 1990. As a consequence, glacier runoff from ice wastage between 1956 and 1990 has increased river runoff by 6.2 km3 in the four river basins under consideration. Besides, the equilibrium-line altitude (ELA) rise estimated from the mean terminus retreat of small glaciers <1 km long is 46 m, which corresponds to a 0.3°C increase of mean temperatures in warm seasons from the LIA to the 1950s.