I am using the numerical weather prediction (NWP) model RAMS to simulate a Tropical Cyclones in BoB region. I made two setups with two Cumulus Parametrization schemes (Kuo and KF). Initial and boundary conditions data were generated from NCEP FNL analysis data.
Here, I am facing a problem of getting NaN values of aerosol/microphysics variables with both the schemes. With the KF scheme, these are obtained at an early stage i.e. at time of KF CP update time (or twice of this time). Whereas, the Kuo scheme provides this error after 3 hours of model initialization.
Initially, I thought that this might be due to the 'timestep'. I rechecked it many times by increasing and decreasing its value but the problem persisted.
I also checked the microphysics parameters set according to my knowledge, I could not find the cause of this error.