Changes in lakes in the southwest part of Nagqu, Tibet and their response to climate change in the past 50 years

doi:10.12006/j.issn.1673-1719.2024.106

Abstract

Abstract:

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.

Key words: Climate change, Lake changes, Remote sensing, Nagqu

Deji-Yuzhen , Lhaba , Basang-Wangdui , Baima-Yucuo , Danzeng-Yiga , Pingcuo-Wangdan , Deji-Yangzong . Changes in lakes in the southwest part of Nagqu, Tibet and their response to climate change in the past 50 years[J]. Climate Change Research, 2024, 20(5): 534-543.

Figures/Tables 12

Fig. 1 Overview of the study area

Fig. 2 Trend of lake area change (a) and M-K test (b) from 1976 to 2022

Table 1 Changes in lake area from 1976 to 2022

Fig. 3 Spatial variation of lake area from 1976 to 2020

Fig. 4 The total area of lakes in the study area in 1976, 1990, 2000, 2010, and 2020

Fig. 5 The changes trend of lake water level and water volume from 2000 to 2017

Table 2 Changes of lake water level and water volume from 2000 to 2017

Fig. 6 Changes of area, water level and water volume of Bamu Co Lake (a) and Cuona Lake (b) during 2000-2017

Fig. 7 The change trend of annual average temperature (a), precipitation (b), maximum frozen soil depth (c) and maximum snow depth (d)

Fig. 8 Annual average temperature (a), precipitation (b), maximum frozen soil depth (c), maximum snow depth (d) M-K test

Table 3 Interdecadal variation of meteorological elements from 1970s to 2010s

Table 4 Correlation analysis between lake area and meteorological factors during 1976-2022

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