swint_opt = 2 is diagnostic variable?

[ckkim]

I am wondering if setting like swint_opt = 2 is only for SWDDNI2 as a diagnostic variable. Radiation scheme by RRTMG produces the SWDOWN as well as SWDDNI, which are employed into the land surface model and PBL scheme. I mean those variables interact with the other variables in physics parameterization.

Setting swint_opt=2 is only for producing the SWDDNI2 as a diagnostic variable by using the current hydrometeors and look up table to identify the solar ramp. Those do not interact with the other variables in physics parameterization.

I am not sure if my understanding is correct.

It would be good if you let me know it.

Thanks in advance.

 

[Ming Chen]

swint_opt is a namelist option that tells the model how to process short-wave radiation based on the updated solar zenith angle between SW call

swint_opt = 0: no interpolation
swint_opt = 1: use interpolation
swint_opt = 2: calls FARMS every model time step

Hope this is helpful for you.

 

[ckkim]

Thanks for your reply. My question is if solar radiation from FARMS every model time step interacts with the other parameterization such as PBL or soli model.

 

[Ming Chen]

yes that is correct.

 

[jimenez]

you need to set up couple_farms to true in the namelist for the GHI from FARMS to be used in the surface energy balance. Otherwise FARMS outputs are only diagnostic variables.
Pedro.

 

[ckkim]

I appreciate it for your reply, Pedro, that is what I want to know.