[Wrf-users] quesion about roughness length in Noah LSM in WRF3.1.1

[Ehsan Erfani]

As you say, roughness length is a specific value in Noah. If you want, you
need to change it, or modify the code so roughness length can change by
snow.

Esan


On Wed, Feb 1, 2012 at 11:34 AM, Liu, Peng <pliu34 at gatech.edu> wrote:

> Dear WRF users and developers,
>  I am using Noah LSM of WRF3.1.1 and I have a specific question about the
> roughness length in Noah LSM.
>  I read the code of module_sf_noahlsm.F and found out that for the
> roughness length, it is always equal to the background
> roughness length even when snow exists ( in function SNOWZ0); while for
> albedo and emissivity, they are modified based on background values when
> snow exists (in function ALCALC). So I wonder why roughness length is not
> modified when snow exists?
>  I am looking forward to your responses.
>
> Thanks in advance.
>
>
> Best,
>
> Peng Liu
>
>
>
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