Minor modification and bug fix in GFS cumulus convection schemes #885
+24
−5
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
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 (GFS_typedefs.F90, GFS_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
If testing this branch requires non-default branches in other repositories, list them.
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