唐古拉山冬克玛底地区冰川变化遥感监测

Remote Sensing Monitoring of Glacier Changes in Dongkemadi Region of Tanggula Mountain

利用1973年MSS、1992年TM、2001年ETM+、2007年TM数字遥感影像资料以及数字高程模型(DEM),结合第一次冰川编目资料,通过地理信息系统和遥感图像处理技术提取了唐古拉山冬克玛底地区不同年份的冰川分布范围。结果表明:研究区内的冰川面积1976年比1969年减小了0.84%,1992年冰川面积比1976年的减小了1.77%,2001年冰川面积比1992年减小了4.24%,2007年冰川面积比2002年减小了3.31%。结合气象资料和有限的野外资料进行分析,该地区冰川退宿趋势同气温升高趋势基本一致。1969年到2007年近40年时间里,冰川面积总共减小17.61km2,占1969年面积的9.81%,冰储量减少5.75km3,相当于水资源损失5.17km3。

Based on the numeric remote sensing image data（MSS data in 1973,TM data in 1992,ETM ＋ data in 2001,TM data in 2007）and numeric terrain model,combined with the first glacier inventories data,the glacier distribution range in Dongkemadi Region of Tanggula Mountain in different years were extracted by using GIS technology and remote sensing image processing technology. The results showed that the glaciers area in the study area had decreased by 0. 84% ,1. 77% ,4. 24% ,3. 31% from 1969 to 1976,1976 to 1992,1992 to 2001 and 2001 to 2007 respectively. Combined with the meteorological data and limited field data,the analysis results showed that glacier shrinkage in the study area was mainly subjected to continuous temperature rise. From 1969 to 2007,the glacier area had decreased 17. 61 km^2,being 9. 81% of that area in 1969. The glacier volume had decreased 5. 75 km3,which meant that water resources lost 5. 17 km3.