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《Journal of Glaciology and Geocryology》 2018-02
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Simulation of seasonally frozen soil temperature based on the Snow Thermal Model (SNTHERM) in Northeast China

LIANG Shuang;YANG Guodong;LI Xiaofeng;ZHAO Kai;JIANG Tao;College of Geo-Exploration Science and Technology,Jilin University;Northeast Institute of Geography and Agroecology,Chinese Academy of Sciences;Changchun Jingyuetan Remote Sensing Test Station,Chinese Academy of Sciences;  
Soil temperature has a major impact on soil fertility,plantation overwintering and microbial activities.Snow cover has albedo and insulation effect which will affect soil temperature and its freeze-thawcycling in winter,and thus studying the impact of snowcover on soil temperature through effective model simulation is of great importance in the context of global change. The Snow Thermal Model(SNTHERM ) is a one-dimensional heat and mass transfer model,which is able to predict temperature profile within snowcover and frozen soil. In this paper,the model combined with the dynamic observation of frozen soil temperature,adopted the statistical parameters and Nash-Sutcliffe efficiency coefficient,is applied to assess the accuracy and efficiency of the simulation of temperature change process of freezing-thawing soil under snowcover. The results showed that SNTHERM is able to simulate effectively the changing process of daily mean soil temperature at the depths of 5,10,15 cm under the snowcover with good agreement. The study revealed that the model having a good applicability under snowcover,which has improved the inversion accuracy of snowparameters. It is also suggested that the simulated accuracy of the soil water content will affect the simulated accuracy of soil temperature without snowcover,which reveals that considering the liquid movement in the model could improve the simulating accuracy.
【Fund】: 科技部科技基础资源调查专项(2017FY100503_3)资助
【CateGory Index】: P642.14
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