[production/RRFS.v1] saSAS sigmab initialization changes and and inline post bug fix for RUC LSM #2488
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Description:
This PR follows @JongilHan66 suggestion and aims to reduce the large convective reflectivity caused by saSAS adjustment in the first timestep during a warm start. The issue is likely related to the inconsistency when DA updates the moisture at t but not the moisture from the previous timestep (t-36s). The moisture from the previous timestep is needed for initializing sigmab (updraft area fraction) when calculating qadv (q advection or tendency term).
The PR forces qadv to zero in the first timestep when a namelist parameter sigmab_coldstart is set to .true. It also reduces the lower limit of sigmab from 0.01 to 0.0 in the first timestep.
The PR also resolves an issue found by @ericaligo-NOAA where inline post does not correctly output soil temperature and moisture in grib2 when using RUC LSM. We tracked this to post_fv3 where iSF_SURFACE_PHYSICS is not updated for RUC LSM. This parameter is used in UPP SURFACE.f for soil variables output. The initial iSF_SURFACE_PHYSICS = 2 in post_fv3 and should be updated to 3 when RUC LSM is used. In this PR we set iSF_SURFACE_PHYSICS =3 when nsoil=9 and successfully output the 9 level soil variables.
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Regression Test Changes (Please commit test_changes.list):
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