Degradation of warm permafrost and talik formation on the Qinghai-Tibet Plateau in 2006-2021
作者机构：Beiluhe Observation and Research Station of Frozen Soil Engineering and EnvironmentKey Laboratory of Cryospheric Science and Frozen Soil EngineeringNorthwest Institute of Eco-Environmental and ResourcesChinese Academy of SciencesLanzhou 730000China China Railway Qinghai-Tibet Group Co.LtdXining 810007China University of Chinese Academy of SciencesBeijing 100049China
出 版 物：《Advances in Climate Change Research》 (气候变化研究进展（英文版）)
年 卷 期：2024年第15卷第2期
页 面：275-284页
核心收录：
学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081803[工学-地质工程] 08[工学] 0818[工学-地质资源与地质工程] 0706[理学-大气科学]
基 金：This work was supported by the program of the research and development of science and technology of China State Railway Group Co.,Ltd.(K2022G017) China Railway Qinghai-Tibet Group Co.Ltd(QZ2022-G03) the State Key Laboratory of Frozen Soil Engineering Open Funds(SKLFSE-ZQ-202203).
主 题：Warm permafrost Degradation Talik Qinghai-Tibet Plateau Climate change
摘 要：Permafrost is degrading globally,particularly those with low thermal stability on the Qinghai-Tibet Plateau,owing to climate change.However,the inadequacy of direct research on permafrost degradation based on in-situ monitoring limits the prediction of permafrost degradation and engineering practices.This study explored the processes and modes of permafrost degradation into talik by analyzing ground temperature data from five points in the hinterland of the Qinghai-Tibet Plateau from 2006 to 2021.The results showed that the degradation of the warm permafrost layer with a geothermal gradient of zero occurred simultaneously in the top and bottom directions.The rate of permafrost degradation from the top down and bottom up increase during the degradation process,but the increase of the former is more drastic after the formation of thawed interlayer.Additionally,the construction of the Qinghai-Tibet Railway changed the degradation modes of the permafrost in adjacent natural sites through horizontal heat transfer,particularly after through talik formation under the embankment.The findings suggest that taking countermeasures before or immediately after forming thawed interlayer is more effective.When evaluating the thermal impact of projects in warm permafrost regions,special attention should be given to the horizontal heat transfer process that may result from the formation of a through talik.
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