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《Journal of Glaciology and Geocryology》 2011-06
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Impact of Surface Energy Variation on Thawing Processes within Active Layer of Permafrost

LI Ren1,2,3 ZHAO Lin1,2,3 DING Yong-jian2,3 WANG Yin-xue1,2,3 DU Er-ji1,2,3, LIU Guang-yue1,2,3 XIAO Yao1,2,3 SUN Lin-chan1,2,3 LIU Yang1,2,3 SHI Wei1,2,3 (1.Cryosphere Research Station on Qinghai-Xizang Plateau,Chinese Academy of Sciences,Lanzhou Gansu 730000,China; 2.State Key Laboratory of Cryospheric Sciences,Lanzhou Gansu 730000,China;3.Cold and Arid Regions Environmental and Engineering Research Institute,Chinese Academy of Sciences,Lanzhou Gansu 730000,China)  
Based on the data of radiation balance and active layer temperatures observed at Tanggula Integrated Observation site from 2006 to 2008,the impact of surface energy on the thawing process within the active layer in the northern Tibetan Plateau are analyzed.It is found that surface energy in this area has significant seasonal variation.The maximums of global radiation,soil heat flux and surface heat source take place in June or July,and the minimums of them take place in November or December.The annual mean soil heat flux during the study period is 0.12 MJ·m-2·d-1,and the active layer is endothermic mainly.During the freeze-thaw cycle period,the vertical variation process of temperature within the active layer is similar to that of surface energy.The surface thawing depth closely relates to the surface energy process.During the thawing period,the thawing depth increases gradually with the increase of solar energy received by ground surface.When the surface energy accumulation is 0.0 MJ·m-2,the thawing depth reaches the minimum,and then increases with the accumulation of surface energy.This process can be depicted by a power equation.
【Fund】: 国家自然科学基金项目(40871037;40830533);; 冰冻圈与全球变化重点实验室自主课题(SKLCS-ZZ-2010-03);; 中国科学院百人计划项目(51Y251571);; 青年基金(40901042);; 科技部基础项目(2008FY110200);; 青海三江源自然保护区生态环境保护和建设工程生态监测本底-冻土监测及综合评估项目资助
【CateGory Index】: P642.14
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