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《Journal of Glaciolgy and Geocryology》 2002-06
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Variation of the Ground Temperature Field in Permafrost Regions along the Qinghai-Tibetan Railway

PAN Wei dong 1, 3 , YU Shao shui 2, JIA Hai feng 3, LIU Deng ke 2(1. Southwest Jiaotong University, Chengdu Sichuan 610031, China; 2. State Key Laboratory of Frozen Soil Engineering, CAREERI, CAS, Lanzhou Gansu 730000, China; 3. Northwest Research Institute, CREC, Lanzhou Gansu 730000, China)  
Over 550 km roadbed of the Qinghai-Tibetan Railway is constructed in permafrost Regions. Analyzing the data of main observatories on permafrost regions in the Tibetan Plateau, it is found that the main climate change trend in permafrost regions is increasing in the last 30 years. The change of ground temperature field embodies that climate change influences thermal state of frozen soil. For the 30 years, air temperature in the plateau has increased about 0.45 ℃, causing the temperature of frozen soil averagely increasing about 0.2~0.3 ℃. Air temperature increase has obviously influenced the ground temperature down to 20 m deep and has slight effect on the deeper soil. In this paper, analyzing the observed ground temperature data in representative permafrost areas along the Qinghai-Tibetan Railway, it is revealed that the ground temperature of the upper frozen soil has increased with an influence depth of 40 m.
【Fund】: 国家自然科学基金项目 ( 40 1710 2 1);; 中国科学院知识创新工程重大项目 (KZCX1 SW 0 4 )资助
【CateGory Index】: P642.14
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