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以对气候变化最为敏感的季风温冰川——贡嘎山冰川为研究对象,利用2002年的ETM+遥感影像和第一次冰川编目数据,提取两期冰川边界并叠加到一起,分析冰川变化趋势.结果表明:从1966年到2002年,贡嘎山冰川总体处于退缩状态,冰川总面积减少6.36%,年均减小0.447 km2,西坡冰川由41条减少到39条,面积减小7.89 km2,减小率为7.97%;东坡冰川由33条增加到36条,但冰川面积减少7.20 km2,减小率为4.71%.2008年5月GPS野外实地测量结果显示,1966—2008年的42 a,海螺沟冰川退缩约943 m,燕子沟冰川退缩494 m,小贡巴冰川退缩210 m,而大贡巴冰川长度基本保持不变,但冰储量在减少.在全球气候变暖的大背景下,温度升高可能是导致贡嘎山地区现代冰川退缩的主要原因.
Taking the monsoon glacier-Gongga Mountain glacier, which is the most sensitive to climate change, as the research object, two glacier boundaries were extracted and summed up by using ETM + remote sensing images and the first glacier catalog data in 2002 to analyze the trend of glacier change. The results show that from 1966 to 2002, the glacier of Gongga Mountain retreats, with the total glacier area decreasing by 6.36% and the average annual decrease of 0.447 km2. From 41 to 39, the area of the glacier in the western slope decreases by 7.89 km2, The rate of decrease was 7.97%; the number of Dongpo glaciers increased from 33 to 36, but the area of glaciers decreased by 7.20 km2 and the rate of decrease was 4.71%. Field measurements of GPS field in May 2008 showed that 42 a , Hailuogou glacier retreated about 943 m, Yanzigou glacier retreated 494 m, and Xiao Gongba glacier retreated 210 m, while the length of the Gongjimba glacier remained basically unchanged, but the amount of ice reserves was decreasing. In the global context of global warming The temperature rise may be the main reason for the retreat of modern glaciers in the Gongga Mountain area.