利用1970年左右地形图和1995、1999、2002年及2006年的Landsat-TM/ETM+遥感影像,在地理信息系统技术支持下,提取冰川边界,对祁连山疏勒南山地区的冰川变化进行研究.结果表明:研究区内的冰川在1990年代变化显著,1995年冰川面积比1970年的减少了5.8%,1999年冰川面积比1995年代的减少了3.0%,2002年冰川面积比1999年减少了1.7%,2006年冰川面积比2002年减少了3.0%.冰川的长度与冰川总面积变化趋势基本一致,且冰川规模越小的冰川变化越显著.对研究区附近气象站1957—2006年年均温和年降水量数据进行对比分析,冰川的变化基本上反映了气候的变化.
Glaciers on the Tibetan Plateau play an important role in the earth's climate system.Regular survey of glacier change is almost impossible in most parts of the Tibetan Plateau.Remote sensing is a primary technique and becomes the only means in many places.GIS provides an efficient tool to analyze the status and the change of glaciers.In the paper,the Shulenan Mountain is selected as a test area.Glacier variation in the 1970s,1995,1999,2002 and 2006 were analyzed by means of satellite image and topographical map.The results indicate that the glacierized area had decreased about 5.8% from 1970 to 1995 and had decreased about 3.0% from 1995 to 1999.The glacierized area in 2002 had decreased about 1.7% compared with that in 1999,and the glacierized area in 2006 had decreased about 3.0% compared with that in 2002.Analyzing the annual mean temperature and precipitation of Tuole Station from 1957 to 2006,some evidence of glacier change are found.