Calculating ustar in pbl/sf shcemes

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Calculating ustar in pbl/sf shcemes

Postby wrfsouri » Wed Jan 30, 2019 8:22 pm

Hi, guys

I’d like to change the cd scheme in wrf and calculate the momentu flux, sensible heat flux and latent heat fulx.
I choose YSU (bl_pbl_physics=1) and MM5 Monin-Obukhov scheme (sf_sfclay_physics=1) as the boundary layer scheme and surface layer scheme respectively.
However, I found that in the code of module_sf_sfclay.F, the ust (ustar) have value before calling the subroutine “SFCLAY1D”.
Does someone know where the ust is calculated firstly/primarily?

Thank you.
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Re: Calculating ustar in pbl/sf shcemes

Postby BHajni » Thu Feb 21, 2019 4:59 am

Hi wrfsouri,

I believe it is calculated in the surface scheme you're using. If I remember correctly in Noah-MP there are even a few options to choose from on how the scheme calculates it.

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