Convective Reflectivity

[ericaligo-NOAA]

Description

Convective reflectivity is estimated and combined with the reflectivity computed in the microphysics for Thompson and NSSL microhysics as well as deep/shallow GF convection and SAS convection.

Solution

@RuiyuSun added the calculations for SAS and Thompson. I moved the calculations over to GFS_MP_generic_post.F90 in order for the calculations to be available for multiple applications. The 3D array, refl_10cm, will contain both a convective and microphysics component.

The attachment illustrates the impact of these changes on reflectivity in RRFS with GF convection. Note that as it is coded now in ufs-weather-model, the convective reflectivity is considered constant from the surface up to model top, which is not physical. The new code also uses the convective precip rate and estimates a constant reflectivity up to the freezing level above which it decays with height up until cloud top using the convective cloud top arrays from both the GF and SAS schemes.

https://docs.google.com/presentation/d/1a0EpXKLxu-1Rz5yb3pQ-ePR3DJcrnCy05Ogg1ZItCCI/edit?usp=sharing

Related to this issue:
ufs-community/ccpp-physics#123