Improving the treatment of the vertical snow burial fraction over short vegetation in the NCAR CLM3 |
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| Authors: | Aihui Wang Xubin Zeng |
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| Institution: | Nansen-Zhu International Research Center, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029,Department of Atmospheric Sciences, The University of Arizona, Tucson, AZ 85721 |
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| Abstract: | One deficiency of the NCAR Community Land Model (CLM3) is the disappearance of the simulated snow even
in the middle of winter over a boreal grassland site due to unrealistically modeled high downward turbulent fluxes.
This is caused by the inappropriate treatment of the vertical snow burial fraction for short vegetation. A new snow
burial fraction formulation for short vegetation is then proposed and validated using in situ observations.
This modification in the CLM3 largely removes the unrealistic surface turbulent fluxes, leading to a more reasonable
snowmelt process, and improves the snow water equivalent (SWE) simulation. Moreover, global offline simulations
show that the proposed formulation decreases sensible and latent heat fluxes as well as the ground temperature
during the snowmelt season over short vegetation dominant regions. Correspondingly, the SWE is enhanced, leading
to the increase in snowmelt-induced runoff during the same period. Furthermore, sensitivity tests indicate that
these improvements are insensitive to the exact functional form or parameter values in the proposed formulation. |
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| Keywords: | snow burial fraction model short vegetation global validation |
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