Changes in lakes in the southwest part of Nagqu,Tibet and their response to climate change in the past 50 years
In order to explore the impact of climate change on the changes in lakes in the southwest of Nagqu,Tibet,the characteristics of lake changes and their relationship with climate factors were analyzed based on the 1976-2022 Landsat series of remote sensing image data.The results showed that the total area of lakes in 1976-2022 showed a significant expansion trend,at a rate of 6.96 km2/a(P<0.001).Compared with 1976,the lake area increased by 234.29 km2 in 2022,with the largest expansion of 144.44 km2 in 2000-2010,accounting for 64.46%of the total expansion;and the smallest expansion of 7.98 km2 in 2010-2020,accounting for only 3.56%of the total expansion.Changes in lake water level and water volume are basically the same as the lake area.The lake area are very significantly correlated with temperature,maximum frozen soil depth of the research area(P<0.01).The increase in temperature has caused the thawing of permafrost and the continuous expansion of the lake area.The influence of precipitation on expansion is staged.
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