Variability of soil moisture and its relationship with surface albedo and soil thermal parameters over the Loess Plateau |
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| Authors: | Xiaodan Guan Jianping Huang Ni Guo Jianrong Bi Guoyin Wang |
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| Institution: | Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000,Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000,Institute of Arid Meteorology, China Meteorological Administration, Lanzhou 730020,Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000,Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000} |
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| Abstract: | data from july 2006 to june 2008 observed at sacol (semi-arid climate and environment observatory
of lanzhou university, 35.946oN, 104.137oE, elev. 1961 m), a semi-arid site in northwest china,
are used to study seasonal variability of soil moisture, along with surface albedo and other soil thermal
parameters, such as heat capacity, thermal conductivity and thermal diffusivity, and their relationships to
soil moisture content. the results indicate that surface albedo decreases with increases in soil moisture
content, showing a typical exponential relation between the surface albedo and the soil moisture. the heat
capacity, the soil thermal diffusivity, and soil thermal conductivity show large variations between julian
day 90--212 and 450--578. the soil thermal conductivity is found to increase as a power function of soil
moisture. soil heat capacity and soil thermal diffusivity increase with increases in soil moisture. the
sacol observed soil moisture are also used to validate the amsr-e/aqua retrieved soil moisture and there is
good agreement between them. the analysis of the relationship between satellite retrieved soil moisture and
precipitation suggests that the variability of soil moisture depends on the variation of precipitation over
the loess plateau. |
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| Keywords: | soil moisture surface albedo soil heat capacity soil thermal conductivity soil thermal diffusivity AMSR-E soil moisture product Loess Plateau |
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