A study of supraglacial lakes in Baltoro Glacier based on Sentinel-2 images
Supraglacial lake is an important part of glacier and an indicator of glacier ablation, which not only responds rapidly to global climate change, but also has important significance for the understanding and mastering of regional water resources information. In this paper, the Sentinel-2 images and random forest algorithm are employed to identify and extract the supraglacial lakes of Baltoro Glacier. Furthermore, the spatial distribution characteristics of supraglacial lakes and the relationship between the area/number of supraglacial lakes and glacier elevation are analyzed. The accuracy, completeness and error rates of supraglacial lakes extraction in this paper are 96. 07％, 92. 18％ and 11. 59％, respectively. A total of 567 supraglacial lakes are identified in Baltoro Glacier, with an area ranging from 249. 46 to 37134 m2 , and most of them are distributed between 3 and 26 km from the glacier terminus. Moreover, the number of supraglacial lakes is the largest between 3800 and 4300 m with generally large area, and the average area is 1922 m2 . With the increase of elevation, the number and area of supraglacial lakes gradually decrease. In particular, there are only 15 supraglacial lakes with an average area of 356 m2 in the elevation of above 5300 m. The decrease in glacier surface temperature due to the increase in elevation is the main reason for the sharp decline in the number and area of supraglacial lakes.
万方数据
维普
