气候变化领域集成服务门户(CCPortal): Thermokarst lakes group accelerates permafrost degradation in the Qinghai-Tibet Plateau, China: A modeling study

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DOI	10.1016/j.jhydrol.2023.130072
	Thermokarst lakes group accelerates permafrost degradation in the Qinghai-Tibet Plateau, China: A modeling study
	Ke, Xianmin; Wang, Wei; Huang, Wenfeng; Niu, Fujun; Gao, Zeyong
发表日期	2023
ISSN	0022-1694
EISSN	1879-2707
卷号	625
英文摘要	Thermokarst lakes in the Qinghai-Tibet Plateau (QTP) are increasing in number and lake surface area, intensifying the lake-permafrost interaction and making it more complex, thus affecting the hydrological and ecological environment. Although the impact of the individual lake on permafrost has been studied, the effects of lakes group on permafrost and regional hydrological processes remain unexplored. Hence, in this study, modified SUTRA models considering thermal conduction and convection processes were established for five scenarios, including a current environment and four thought experiments, to determine whether and how thermokarst lakes group accelerates permafrost degradation. The models could effectively simulate the variations in the ground temperature with time and depth, with the highest RMSE and lowest R2 being 1.443 degrees C and 0.706, respectively. Thermal conduction and convection played a dominant role before and after the formation of through-taliks below the thermokarst lakes, respectively. Through-taliks strengthened the hydraulic connection between supra-permafrost water, sub-permafrost water, and lakes, and changed the groundwater circulation pattern. An increase in the number of thermokarst lakes led to the formation of more through-taliks and improved the heat transfer efficiency, accelerating permafrost degradation. Thermal erosion of the permafrost base was more severe in the presence of a recharge source and pathway via a talik. The results highlight the importance of thermal convection and groundwater circulation in permafrost degradation. The findings can help understand the interaction mechanism between permafrost and thermokarst lakes and the variation in environmental and ecohydrological processes in cold regions.
关键词	Thermokarst lakes group Permafrost degradation Groundwater flow Through-talik Hydrothermal coupled model
英文关键词	GROUNDWATER-FLOW; BEILUHE BASIN; CLIMATE; WATER; THAW; TRANSPORT; SIMULATIONS; MOISTURE; BENEATH; ALASKA
WOS研究方向	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS记录号	WOS:001092429600001
来源期刊	JOURNAL OF HYDROLOGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283103
作者单位	Chang'an University; Chang'an University; South China University of Technology; South China University of Technology; Chinese Academy of Sciences; Chang'an University
推荐引用方式 GB/T 7714	Ke, Xianmin,Wang, Wei,Huang, Wenfeng,et al. Thermokarst lakes group accelerates permafrost degradation in the Qinghai-Tibet Plateau, China: A modeling study[J],2023,625.
APA	Ke, Xianmin,Wang, Wei,Huang, Wenfeng,Niu, Fujun,&Gao, Zeyong.(2023).Thermokarst lakes group accelerates permafrost degradation in the Qinghai-Tibet Plateau, China: A modeling study.JOURNAL OF HYDROLOGY,625.
MLA	Ke, Xianmin,et al."Thermokarst lakes group accelerates permafrost degradation in the Qinghai-Tibet Plateau, China: A modeling study".JOURNAL OF HYDROLOGY 625(2023).