How to remove the friction effect in WRF?

[hxye]

I want to exclude surface friction effect and set the exchange coefficient Cd=0. Meanwhile, I intend to keep Ck unchanged.
whether can I achieve this goal through modifying the namelist.input, or should I modify the source code of WRF?

 

[Ming Chen]

Hi,
There is no namelist option that can turn off momentum exchange but keep heat/moisure exchange on. Pease modify the related code based on your option of sf_sfclay_physics.

 

[hxye]

Thanks for reply. I use the MM5 surface layer scheme, thus I need to modify the module_sf_sfclay.F. However, I found that the Ck and Cd is only diagnostic variable and is determined by ZNT in the source code. When I set Cd=0 and Ck=0.001, I wonder if these changes will be adopted for the calculation of surface heat and momentum fluxes?