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《Journal of Glaciolgy and Geocryology》 2002-05
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Impact of Soil Freezing and Thawing Process on Thermal Exchange between Atmosphere and Ground Surface

LI Shu\|xun,\ NAN Zhuo\|tong,\ ZHAO Lin (Cold and Arid Regions Environment and Engineering Research Institute, CAS, Lanzhou Gansu 730000, China)  
The change characteristics of the heat exchange between atmosphere and ground surface during the temperature wave propagation downwards, the consuming heat during soil freezing or thawing, the change characteristics of the ground temperature observed in different types of freezing ground, the impact of soil freezing and thawing process on heat exchange between atmosphere and ground surface, and the ground temperature are discussed. According to computation and observation, the following conclusions can be drawn. \;1) The soil freezing and thawing process greatly increases the heat exchange between atmosphere and ground surface. The propagation speed of ground temperature attenuates with depth and increasing pressure when phase change is absent. \;2) During soil thawing the heat exchange is 3 times more than that without phase change. During soil freezing the heat exchange is 3\^5 times more than that without phase change. \;3) In seasonally frozen ground regions annual mean ground temperature is mainly dependent on summer ground surface temperature, and in seasonally frozen ground regions annual mean ground temperature is mainly dependent on winter ground surface temperature.
【Fund】: 国家基础研究发展规划项目 (G19980 40 80 3 );; 中国科学院寒区旱区环境与工程研究所知识创新工程项目 (CACX2 0 0 0 0 9)资助
【CateGory Index】: P642.14
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