CONUS parameterization

[janac4]

Hello, I'm working with WRF in a domain placed in Central America with a 160x100 cell grid of 5 km x 5 km resolution, two way nested with a smaller domain of 1 km x 1 km resolution. I want to use CONUS parameterization in both domains, but have questions about cu_physics, since Tidke option (default in CONUS) isn't scale aware so I don't know if I should use option 6 in domain 1 and option 0 in domain 2. Any guidance in this topic would be great,
Jana.

 

[kwerner]

Hi Jana,
Yes, you can do it that way. You can still set the physics_suite to CONUS, but then have an additional line that indicates the specific options for cu_physics. For e.g.,

&physics
physics_suite = 'CONUS'
cu_physics = 6, 0

 

[janac4]

Thanks for your answer,
would you recommend me to do it anyway? I don't have much experience with this cumulus option and with a 1km resolution domain I'm not sure it would be better to turn it on or off.

 

[kwerner]

It's better to turn it off for a 1km domain. You may find some useful information on this topic in the Physics-Cumulus Parameterization presentation from our WRF tutorial, or if you'd prefer the .pdf version of that presentation, you can find it here.

 

[janac4]

Thank you so much!