气候变化领域集成服务门户(CCPortal): Observed permafrost thawing and disappearance near the altitudinal limit of permafrost in the Qilian Mountains

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DOI	10.1016/j.accre.2022.08.004
	Observed permafrost thawing and disappearance near the altitudinal limit of permafrost in the Qilian Mountains
	Sun, Wen; Zhang, Tingjun; Clow, Gary D.; Sun, Yan-Hua; Zhao, Wen -Yu; Liang, Ben -Ben; Fan, Cheng-Yan; Peng, Xiao-Qing; Cao, Bin
发表日期	2022
ISSN	1674-9278
起始页码	642
结束页码	650
卷号	13 期号:5 页码:9
英文摘要	Permafrost degradation has been widely reported on the Tibetan Plateau (TP). However, directly observed evidence of permafrost thawing processes and degradation rates are very limited, although it is expected to be prevalent near the periphery of a permafrost area. Here, we report permafrost changes and disappearance in the Qilian Mountains (northeastern TP) based on three boreholes instrumented along a 100 m transect during 2014-2021. Our results show that permafrost has significantly degraded in the study area: the mean downward thawing rate from the permafrost table was about 0.16 m per year while the mean upward thawing rate from the permafrost base was about 0.23 m per year. We estimate the mean lateral degradation rate of permafrost in this area was -4.14 m per year. More dramatically, the 1.5 m thick permafrost layer at one of the boreholes thawed completely between April of 2018 and December of 2019. Our results indicate that changes in climatic condition may have played only a limited role in controlling the active layer thickness in the vicinity of the altitudinal limit of permafrost; moisture content and soil conditions play key roles in site-specific permafrost thawing. This study provides new quantitative insights for understanding changes near the altitudinal limit of permafrost, and we suggest that land surface models or Earth system model studies of the lateral heat exchanges should be implemented in order to better represent permafrost thawing processes.
英文关键词	Permafrost; Permafrost degradation; Permafrost lateral thawing; Qilian Mountains
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000874699900003
来源期刊	ADVANCES IN CLIMATE CHANGE RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273984
作者单位	Lanzhou University; University of Colorado System; University of Colorado Boulder; Chinese Academy of Sciences; Institute of Tibetan Plateau Research, CAS
推荐引用方式 GB/T 7714	Sun, Wen,Zhang, Tingjun,Clow, Gary D.,et al. Observed permafrost thawing and disappearance near the altitudinal limit of permafrost in the Qilian Mountains[J]. 中国科学院青藏高原研究所,2022,13(5):9.
APA	Sun, Wen.,Zhang, Tingjun.,Clow, Gary D..,Sun, Yan-Hua.,Zhao, Wen -Yu.,...&Cao, Bin.(2022).Observed permafrost thawing and disappearance near the altitudinal limit of permafrost in the Qilian Mountains.ADVANCES IN CLIMATE CHANGE RESEARCH,13(5),9.
MLA	Sun, Wen,et al."Observed permafrost thawing and disappearance near the altitudinal limit of permafrost in the Qilian Mountains".ADVANCES IN CLIMATE CHANGE RESEARCH 13.5(2022):9.