Minor modification and bug fix in GFS cumulus convection schemes #885
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JongilHan66
approved these changes
Oct 31, 2024
RuiyuSun
approved these changes
Dec 13, 2024
grantfirl
reviewed
Jan 29, 2025
grantfirl
reviewed
Jan 29, 2025
grantfirl
reviewed
Jan 29, 2025
…nto conv_hr5update
…nto conv_hr5update
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@rhaesung can you point to https://github.com/laurenchilutti/GFDL_atmos_cubed_sphere/tree/remap_io_emc? NOAA-GFDL/GFDL_atmos_cubed_sphere#374 has no impact on weather model baselines. So it's good to bring it in. |
@jkbk2004 Done! |
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Description
This PR mainly involves changes in ccpp-physics, and the code was provided by @JongilHan66.
Modified prognostic updraft fraction (sigmab) calculation in 'progsigma_calc.f90' which is physically more sound:
a) moisture convergence calculation: integrate from the convection source level rather than from the cloud base
b) 2D advection of sigmab: sigmab advection averaged over the cloud layers rather than taking a maximum sigmab advection from k=2 to the model top
c) To suppress unrealistically large reflectivity in the model first time step, minimum sigmab at the first time step is set to zero
Fix in missing vertical transport of turbulent kinetic energy (TKE) when aerosol transport is turned on (samfdeepcnv.f & samfshalcnv.f)
Introduce TKE at model layer interfaces (tkeh) for use in convection schemes (CCPP_typedefs.F90, CCPP_typedefs.meta, satmedmfvdifq.F, satmedmfvdifq.meta, samfdeepcnv.f, samfdeepcnv.meta, samfshalcnv.f, and samfshalcnv.meta)
Vertical transports of hydrometeor variables are currently not allowed in the convection schemes. But vertical transports of number concentrations of only cloud water and ice are mistakenly allowed, which is fixed in this update (CCPP_typedefs.F90)
All the modifications and bug fixes above had neutral impacts on the GFS forecasts
Dependencies
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Those branches should have matching names (ideally)
Do PRs in upstream repositories need to be merged first?
If so add the "waiting for other repos" label and list the upstream PRs