Variation of Glaciers and Its Response to Climate Change in Bomi County of Tibet Autonomous Region in 1980-2010
By applying remote sensing (RS) and geographic information system (GIS) technology,combined with Bomi meteorological data of 1960-2010,glaciers distribution characteristics and spatial and temporal variations of typical large glaciers during 1980-2010 in region of Bomi County,Tibetan Plateau are analyzed.The results show that there are a total number of 2,040 glaciers with a total area of 4 382.5 km2 in region of Bomi County,glacier total area of 4 086 km2 located at an altitude of 4 000 ～ 6 000 m,accounting for 93.2％of the total area of the glacier.There are 1 504 glaciers with an area of 3 180.04 km2 distributed on the southern slope,accounting for 73.73％ of total glacier number and 72.56％ of total glacier area respectively,while accounting for less than one-third ones on the north slope.Extraction four periods of 1980,1990,2000 and 2010 glacier area of the 24 large glaciers with greater than 20 km2 were analyzed.The all 24 greater glaciers in Bomi County have a decreasing trend from 1980 to 2010,a glacier area of 1 592.78 km2 in 1980 retreat to one of 1 567.04 km2 in 2010,a total retreated area of 25.74 km2; which glacier change of 1980 to 1990 contributed the largest retreated area of 16.62 km2,accounting for a total area of glacier retreat amount of 64.6％.Records data of Bomi Meteorological Station show that there has been a continuous temperature rise,especially after 1980,which might seriously cause the glacier shrinkage,and changes in precipitation have less impacting on the glacier variation.
glacier changeclimate changeLandsatBomi County of Tibet Autonomous Region
NETL
NSTL
万方数据
维普
