Observed permafrost thawing and disappearance near the altitudinal limit of permafrost in the Qilian Mountains
作者机构：Key Laboratory of Western China's Environmental Systems(Ministry of Education)College of Earth and Environmental SciencesLanzhou UniversityLanzhou 730000China Institute of Arctic and Alpine ResearchUniversity of Colorado BoulderBoulder 80303USA National Tibetan Plateau Data CenterKey Laboratory of Tibetan Environmental Changes and Land Surface ProcessesInstitute of Tibetan Plateau ResearchChinese Academy of SciencesBeijing 100101China
出 版 物：《Advances in Climate Change Research》 (气候变化研究进展（英文版）)
年 卷 期：2022年第13卷第5期
页 面：642-650页
核心收录：
学科分类：07[理学] 0705[理学-地理学] 070501[理学-自然地理学]
基 金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences(XDA20100103) by the National Natural Science Foundation of China(41801028,42171120)
主 题：Permafrost Permafrost degradation Permafrost lateral thawing Qilian Mountains
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 ***,we report permafrost changes and disappearance in the Qilian Mountains(northeastern TP)based on three boreholes instrumented along a 100 m transect during 2014–*** 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 *** estimate the mean lateral degradation rate of permafrost in this area was∼4.14 m per *** dramatically,the 1.5 m thick permafrost layer at one of the boreholes thawed completely between April of 2018 and December of *** 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 *** 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.
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