Make Clouds Transparent to Solar but not IR Radiation in WRF

[cmh529]

Hello,

I understand that setting icloud=0 turns off the cloud effect on optical depth for shortwave radiation and longwave radiation (options 1,4); however, I am not seeing any way to turn off the cloud effect for just solar or just IR. Any help is greatly appreciated!

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[Ming Chen]

The cloud effect can always be turned off within the specific scheme you intend to use. For example, suppose you run with RRTMG radiation scheme, and you only want the cloud impact in LW but not in SW. You can simply add a single line

ICLOUD =1

at the beginning of the code phys/module_ra_rrtmg_sw.F.

Note that this is just an example. You can follow the similar approach to modify whatever scheme you activate.

 

[cmh529]

Thanks Ming. Did you mean to say ICLOUD = 0?

 

[Ming Chen]

sorry for the typo. yes that is what I mean: ICLOUD = 0.
Please try and let me know whether it works.

 

[cmh529]

Hi Ming,

No worries.

Setting ICLOUD = 0 gave me unintelligible error messages during compilation. Rather than try to debug them, I simply commented out the two "IF (ICLOUD .ne. 0) THEN" blocks within the RRTMG_SWRAD subroutine. That seemed to do the trick.

Bottom line is, you have to actually modify the source code - there is no way to do it in the namelist.

Thanks for your help.