Noise in Microphysics Latent Heating Term

[tzaremba]

Hello, I am encountering noise in the microphysics latent heating (h_diabatic) field associated with the cloud water mixing ratio in my outer domains (8.1 km, 2.7 km, and 900 m). Attached is an example cross-section highlighting this noise, outlined by the cloud water mixing ratio. I am using the Thompson Microphysics scheme and initializing my model with RAP and NAM data. I am wondering if this noise is a physical phenomenon or if it can be mitigated by adjusting the model. Any insights or suggestions would be greatly appreciated. I am running WRFV4.4.1 on Derecho.

 

[Ming Chen]

There are a few issues in your namelist:

(1) you set

max_fom =3
dx = 8100,
dy = 8100,

Please add dx for the other 2 child domains, i.e.;
dx = 8100, 2700, 900
dy = 8100, 2700, 900

(2) For dx = 8.1km, time_step = 20 is way too small. Please change it to 45.

(3) For RUC shceme, soil layers should be 6 or 9, i.e.,

sf_surface_physics =3,
num_soil_layers -9

Can you change the above options and try again?