Remote Sensing Monitoring of Glacier Changes in Dongkemadi Region of Tanggula Mountain
QIAO Cheng-jun (Laboratory of Watershed Hydrology and Applied Ecology in Cold and Arid Regions,Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou,Gansu 730000)
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 km2,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.