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Modeled response of talik development under thermokarst lakes to permafrost thickness on the Qinghai-Tibet Plateau
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Citation of this paper:Feng Ling,QingBai Wu,FuJun Niu,TingJun Zhang,2014.Modeled response of talik development under thermokarst lakes to permafrost thickness on the Qinghai-Tibet Plateau.Sciences in Cold and Arid Regions,6(6):0521~0530.
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Author NameAffiliationE-mail
Feng Ling 1. Institute of Plateau Meteorology, China Meteorological Administration, Chengdu, Sichuan 620071, China 2. School of Mathematics and Statistics, Zhaoqing University, Zhaoqing, Guangdong 526061, China lingf@zqu.edu.cn 
QingBai Wu 3. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
FuJun Niu 3. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China  
TingJun Zhang 4. College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, Gansu 730000, China  
 
Abstract:Permafrost thickness under identical climates in cold regions can vary significantly because it is severely affected by climate change, topography, soil physical and thermal properties, and geothermal conditions. This study numerically investigates the response of ground thermal regime and talik development processes to permafrost with different thicknesses under a thermokarst lake on the Qinghai-Tibet Plateau. On the basis of observed data and information from a representative monitored lake in the Beiluhe Basin, we used a heat transfer model with phase change under a cylindrical coordinate system to conduct three simulation cases with permafrost thicknesses of 45 m, 60 m, and 75 m, respectively. The simulated results indicate that increases in permafrost thickness not only strongly retarded the open talik formation time, but also delayed the permafrost lateral thaw process after the formation of open talik. Increasing the permafrost thickness by 33.3% and 66.7% led to open talik formation time increases of 83.66% and 207.43%, respectively, and resulted in increases in the lateral thaw duration of permafrost under the modeled thermokarst lake by 28.86% and 46.54%, respectively, after the formation of the open taliks.
keywords:permafrost thickness  thermokarst lakes  talik development  lateral thaw  modeling
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