About the usage of module_sf_exchcoef.F module in the momentum roughness calculation over water

[bnkreddy]

Hi all,
I need information about the roughness scale calculations in the WRF model.
Does the WRF model use the module_sf_exchcoef.F located in the physics directory while calculating the roughness length of the momentum and enthalpy fluxes?
I have gone through the code and realized it would work only during HWRF compilation (I am not sure). If anyone has the experience, please let me know.
Thank you


Regards
Nandu

 

[Ming Chen]

Nandu,
module_sf_exchcoef.F is only applied to ocean points.
roughness length is provided in LANDUSE.TBL, and recalculated in various sfclay schemes, for example, module_sf_sfclayrev.F.
I am talking of WRF-ARW. if you work with HWRF, it might be different.

 

[bnkreddy]

Nandu,
module_sf_exchcoef.F is only applied to ocean points.
roughness length is provided in LANDUSE.TBL, and recalculated in various sfclay schemes, for example, module_sf_sfclayrev.F.
I am talking of WRF-ARW. if you work with HWRF, it might be different.

Dear Ming Chen,
Thank you for the information.
I understood that module_sf_exchcoef.F would only apply to the ocean points.
The LANDUSE.TBL uses a roughness length of 0.01 over water bodies, and I think it is fixed.
I am performing coupled model simulations such as WRF-ARW coupled with the ROMS model for tropical cyclones. I want to modify the subroutines to introduce lower Cd values for stronger wind speeds in the module_sf_exchcoef.F module.
Do you know where I can make these changes if not in the module_sf_exchcoef.F?


Regards
Nandu