A theoretical analysis of the effects of surface heterogeneity on the fluxes between ground and air |
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| Authors: | M Zhao |
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| Institution: | (1) Key Laboratory for Mesoscale Severe Weather of Ministry of Education and Department of Atmospheric Sciences, Nanjing University, Nanjing, China, CN |
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| Abstract: | Summary
The computation of the fluxes between ground surface and air in atmospheric models is based on the assumption that the surfaces
parameters are horizontally homogeneous. In reality, the surface is heterogeneous, inducing a difference between the computed
and realistic fluxes. Assuming that the distributions of temperature and humidity of the surface are normal, the difference
of the fluxes for homogeneous and heterogeneous surface is found theoretically. The results show that the effect of the heterogeneity
on the radiation flux is small, but attains a certain degree on the sensible and latent heat fluxes. However, this effect
on the heat fluxes is not great when the standard deviation of the distribution of the surface parameters also is small. Only
in case of great standard deviation, the difference may attain several W/m2 even the order of magnitude of 10 W/m2. Usually the computed sensible and latent heat fluxes are slightly greater for the heterogeneous case than that for homogeneous
case, but when the interaction between the temperature and humidity of the surface is considered, the reverse is true.
Received January 18, 2001 Revised July 31, 2001 |
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