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以1976年MSS、1991年TM、2000和2014年ETM+遥感影像资料为信息源,通过RS和GIS技术,提取了念青唐古拉山西段爬努河流域四个时期的冰川信息,并结合周边气象资料进行冰川变化的原因分析。结果表明:1)1976-2014年,研究区冰川面积从621.39km2减少到481.95km2,退缩139.44km2,冰川面积退缩的年平均速率为0.59%·a-1,年平均退缩面积3.67km2·a-1。近15a来冰川退缩尤为剧烈,年均退缩速率达到1.03%·a-1。2)不同时段内冰川退缩速率不同,2000-2014年冰川退缩速率整体都大于1991-2000和1976-1991年,冰川退缩速率呈大-小-大的过程。3)研究区西北坡冰川的面积退缩速率最大,其次是北坡,西南坡最小。4)通过分析冰川变化对气候变化的响应,推断气温上升和降水在波动中变化不大可能是爬努河流域冰川处于退缩状态的主要原因。
Taking the MSS in 1976, ETM + remote sensing image data in 2000 and 2014 as the source of information and the information of glaciers in four periods of the Dun Nu River basin in the western segment of the Nyainqentanglha Mountain by means of RS and GIS technology, the glacial information was extracted and combined with the surrounding meteorological data Analysis of the Causes of Glacier Change. The results show that: 1) From 1976 to 2014, the glacier area in the study area decreased from 621.39km2 to 481.95km2, with a regression of 139.44km2. The annual average rate of glacier area shrinkage was 0.59% · a-1, with an average annual shrinkage area of 3.67km2 · a- 1. The glacier retreat was particularly intense with a mean annual retreat rate of 1.03% · a-1.2 over the past 15 years. The retreat rates of glaciers varied from time to time in different periods of time. The retreat rates of glaciers in 2000-2014 were higher than those in 1991-2000 and 1976-1991. Retraction rate was large - small - large process. 3) The glacier in the northwestern slope of the study area has the largest area retreat rate, followed by the north slope and the southwestern slope the smallest. 4) By analyzing the response of glacier change to climate change, it is concluded that the change of temperature rise and precipitation is not likely to fluctuate in the fluctuation. This may be the main reason that the glacier in the Cliff River Basin is in a state of retreat.