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DOI	10.1016/j.geomorph.2023.108582
	Interaction of permafrost degradation and thermokarst lakes in the Qinghai-Tibet Plateau
	Xu, Zhida; Jiang, Liming; Guo, Rui; Huang, Ronggang; Zhou, Zhiwei; Niu, Fujun; Jiao, Zhiping
发表日期	2023
ISSN	0169-555X
EISSN	1872-695X
卷号	425
英文摘要	The degradation of ice-rich permafrost can form thermokarst landforms such as thermokarst lakes. There are a large number of thermokarst lakes distributed in the ice-rich permafrost region of the Qinghai-Tibet Plateau. However, the effect of the spatial distribution of thermokarst lakes on permafrost degradation at a regional-scale in the Qinghai-Tibet Plateau is not fully understood. Time-series interferometric synthetic aperture radar is an established remotely-sensing tool to measure surface deformation in permafrost regions, and has been widely used in permafrost degradation investigation. In this study, we characterized spatial-temporal variations of surface deformation in the Beiluhe Basin in the Qinghai-Tibet Plateau with time series InSAR analysis, and extracted thermokarst lakes from Landset-8 images. Additionally, MODIS land surface temperature data and Stefan model were used to estimate the active layer thickness of permafrost in the basin. Results showed that the linear subsidence rate in the permafrost region within the basin generally exceeded 5 mm/yr, with a seasonal deformation amplitude of >10 mm, and the active layer thickness ranged from 2.1 m to 3.5 m. We found that permafrost degradation was concentrated in the areas with a high density of thermokarst lakes. Specifically, the density of thermokarst lakes was positively correlated with the linear subsidence rate and the seasonal deformation amplitude, and the larger active layer thickness clustered significantly in the area of thermokarst lakes. We also found that accelerated thermokarst collapse of the lake shore intensified the development of thermokarst lakes, and the lake expansion further aggravated the permafrost deformation. In addition, there is a strongly negative correlation (r = -0.78) between active layer thickness and Normalized Difference Vegetative Index in the basin, inferring that the degradation of permafrost may lead to the transformation from alpine meadow to alpine grassland and alpine desert.
关键词	InSAR deformation Thermokarst lake Permafrost degradation Active layer thickness Qinghai -Tibet Plateau
英文关键词	ALPINE ECOSYSTEMS; THERMAL STATE; ACTIVE-LAYER; THAW SLUMP; CLIMATE; BEILUHE; BASIN
WOS研究方向	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000973481600001
来源期刊	GEOMORPHOLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282612
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences
推荐引用方式 GB/T 7714	Xu, Zhida,Jiang, Liming,Guo, Rui,et al. Interaction of permafrost degradation and thermokarst lakes in the Qinghai-Tibet Plateau[J],2023,425.
APA	Xu, Zhida.,Jiang, Liming.,Guo, Rui.,Huang, Ronggang.,Zhou, Zhiwei.,...&Jiao, Zhiping.(2023).Interaction of permafrost degradation and thermokarst lakes in the Qinghai-Tibet Plateau.GEOMORPHOLOGY,425.
MLA	Xu, Zhida,et al."Interaction of permafrost degradation and thermokarst lakes in the Qinghai-Tibet Plateau".GEOMORPHOLOGY 425(2023).