Glacier monitoring studies of Dongkemadi basin from 1990 to 2020
Glacial change is an important embodiment of climate change and has a profound impact on global water resources and ecological environment.Based on Landsat series of remote sensing images,the paper extracted the glacier boundary in recent 30 years and analyzed the glacier area change characteristics of Dongkemadi River from 1990 to 2020.At the same time,the ice temperature was reversed based on atmospheric correction method,so as to explore the response relationship between glacier change and climate change.The results show that:①From 1990 to 2020,the area of Dongkemadi glacier continued to decline,the total area shrank by 1 km2,and the average annual change rate was-0.21%.②Dongkemadi glaciers are widely distributed at the altitude of[5600,5800)m,with the strongest glacier retreat at the altitude of[5300,5400)m.In the past 30 years,the large and small winter and glaciers have retreated 382.89 m and 141.39 m respectively.③From 2017 to 2020,the surface deformation rate of Dongkma bottom glacier was between-233.192 and 172.512mm·a-1.The ice surface in the high altitude area was accumulated,and the ice tongue and some areas showed a thinning trend.④The area with high surface temperature of the glacier is mainly distributed in the western edge to the southern edge of the Great Dongkemadi Glacier and the western edge and part of the eastern edge of the Little Dongkemadi Glacier,and the lower temperature area is mainly distributed in the whole eastern part of the glacier.Rising temperatures may be the main factor leading to the melting of the glacier.
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