WRF Radiation

[Soroush]

Hello everyone,

I would appreciate if someone could help me with my question on WRF radiation scheme. I want to run WRF with off-line radiation. To clarify, I want to turn off the impact of radiation on other meteorological variables at each timestep (decoupling radiation scheme). I took a look at WRF user guide but I couldn't find a way to do that. Would you please let me know how can I run WRF with off-line radiation?
Thank you in advance for your help.


Best,
Soroush

 

[Ming Chen]

Soroush,

WRF real data case cannot work with both long-wave and short-wave radiation schemes being turned off. Only some ideal cases like the 2D gravity case can work in this way.

Ming Chen

 

[Soroush]

Thank you for the reply Ming,
Just to be sure that my question is clear, please note that I don't want to turn off radiation scheme in WRF (real case). In fact, I just want to know how to turn off the feedback from the radiation scheme on meteorology (and chemistry) in WRF(-chem). Is that possible?

Best,
Soroush

 

[Ming Chen]

I am not sure whether I understand your question correctly.
RTHRATENLW and RTHRATENSW are the theta tendencies due to long- and short-wave radiation; SWDOWN and GLW are downward short- and long-wave fluxes in the surface. These variables directly affect meteorological variables in the surface and atmosphere. I suppose that setting them to zero after the radiation scheme is called will turn off the impact of radiation. This is equivalent to running WRF without radiation scheme. However, I don't know why you want to do so. Physically it makes no sense. Furthermore, the model may possibly crash due to the unrealistic physics.
If you work with WRF-CHEM, please talk to our experts in wrf-chem by sending email to wrfchemhelp.gsd@noaa.gov.

Ming Chen

 

[Soroush]

Thank you for the explanation Ming. You're right my question is more related to WRF-Chem (chemistry-radiation feedback).