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	Influences of climate variation on thawing-freezing processes in the northeast of Three-River Source Region China
	Xiang X. H. ; Wu X. L. ; Wang C. H. ; Chen X. ; Shao Q. Q.
	2013
关键词	Snow cover Frozen soil Soil water content Heat transfer residue-soil system simultaneous heat water model surface communities
英文摘要	In cold region, precipitation, air temperature and snow cover significantly influenced soil water and heat transfer, and thus freezing-thawing processes of active soil layer. On the basic of physical processes of water and heat balances and their transfers in the snow covered soil, a water-heat coupling model for snow cover and its underlying soil layers was established in this paper. Numerical solution of the model was conducted by a full-implicit finite volume method. Observation data of snow cover depth, soil water content and active soil depth at two typical sites in the northeast of Three-River Source Region of China were selected for model calibration and validation. The results indicate that the model can capture soil freezing-thawing processes at the two sites. Simulated results reveal that variations of soil water content, soil temperature and soil freezing depth depend on climate conditions of air temperature, precipitation and snow cover as well. In comparison of the simulated results at two sites, we know that thick snow cover hinders temperature transfer from air to soil, resulting in prolonging the time lag between air and soil temperatures, decreasing variations of soil temperature and soil water content and reducing soil freezing depths of active soil. (C) 2012 Elsevier B.V. All rights reserved.
出处	Cold Regions Science and Technology
卷	86
页	86-97
收录类别	SCI
语种	英语
ISSN号	0165-232X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/30149]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xiang X. H.,Wu X. L.,Wang C. H.,et al. Influences of climate variation on thawing-freezing processes in the northeast of Three-River Source Region China. 2013.

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