The interaction between thermokarst lake drainage and ground subsidence accelerates permafrost degradation  

作　　者：Yi-Ning YU Feng-Ming HUI Yu ZHOU Xiao CHENG Ming-Hu DING 

机构地区：[1]State Key Laboratory of Severe Weather,Chinese Academy of Meteorological Sciences,Beijing 100081,China [2]School of Geospatial Engineering and Science,Sun Yat-sen University,and Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519000,China [3]Key Laboratory of Comprehensive Observation of Polar Environment(Sun Yat-sen University),Ministry of Education,Zhuhai 519000,China [4]Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-sen University,Zhuhai 519000,China [5]Key Laboratory of Polar Atmosphere-ocean-ice System for Weather and Climate,Ministry of Education,Shanghai 200438,China

出　　处：《Advances in Climate Change Research》2025年第1期109-124,共16页气候变化研究进展(英文版)

基　　金：supported by the National Natural Science Foundation of China(42376241);the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(311021008);the Basic Research Fund of CAMS(2023Z015,2023Z004 and 2023Z025);the Fengyun-3(03)Batch Meteorological Satellite Project(FY-3(03)-AS-11.10-ZT,FY-3(03)-AS-11.12-ZT).

摘　　要：Since it is not viable to directly evaluate permafrost change based on remote sensing,thermokarst lake drainage(TLD)and ground subsidence serve as indicators for depicting permafrost degradation.Unfortunately,the interaction between these two land surface processes as well as their joint effect remain unclear.In this study,based on a homogenized Landsat-Sentinel archive,TLD was detected in the Lena Basin during 2000e2022 thawing seasons using the modified LandTrendr algorithm.Only 9.7%of thermokarst lakes(TLs)experienced remarkable drainage,TLs larger than 30 hm2 were more prone to undergone drainage processes.The drainage proportion among TLs with different extents all exceeded 10%during 2013e2015,suggesting the gradual drainage which lasted for three years or longer was likely to be the dominating type.The subsidence rates(-1.64±0.89 to-1.94±1.41 mm per year)surrounding drained TLs were higher than regional average(-1.40±1.19 to-1.60±1.26 mm per year).As the distance to drained TLs decreased,the proportion of subsidence measurements,rates,and seasonal subsidence magnitude exhibited consistent increasing trends.The subsidence rate was higher in the direction of more intense drainage than that in other directions.The ground subsidence trigger TLD by providing meltwater and reducing structural support,while TLD in turn contributes to ground subsidence by forming drainage channels.More importantly,our findings proved that their interaction further accelerates permafrost degradation,which is critical for more accurately modeling the complex permafrost degradation processes under the warmer and wetter Arctic climate.

关 键 词：Arctic permafrost Lena basin Thermokarst lake drainage Ground displacement Remote sensing 

分 类 号：P642.14[天文地球—工程地质学]