The Impact of Soil Freezing/Thawing Processes on Water and Energy Balances |
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| Authors: | ZHANG Xia and SUN Shufen |
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| Institution: | Key Laboratory of Regional Climate-Environment Research for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029,State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Science, Beijing 100029 |
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| Abstract: | A frozen soil parameterization coupling of thermal and hydrological
processes is used to investigate how frozen soil processes affect water and
energy balances in seasonal frozen soil. Simulation results of soil liquid
water content and temperature using soil model with and without the
inclusion of freezing and thawing processes are evaluated against
observations at the Rosemount field station. By comparing the simulated
water and heat fluxes of the two cases, the role of phase change processes
in the water and energy balances is analyzed. Soil freezing induces upward
water flow towards the freezing front and increases soil water content in
the upper soil layer. In particular, soil ice obviously prevents and delays
the infiltration during rain at Rosemount. In addition, soil
freezing/thawing processes alter the partitioning of surface energy fluxes
and lead the soil to release more sensible heat into the atmosphere during
freezing periods. |
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| Keywords: | frozen soil water and energy balances freezing/thawing processes surface flux |
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