Cloud cover parameter changes for GFSv17

[RuiyuSun]

Description

There is a low cloud bias in the current version of the GFSv17. The formula used in the cloud cover calculation is based Xu/Randall (1996). To increase the cloud cover in the GFSv17, a different set of parameters is used in the formulation. The increase in the cloud cover will also help to reduce the downward SW at the surface.

Issue(s) addressed

This PR

• fixes noaa-emc/fv3atm/issues/<1026>

Testing

How were these changes tested?
This change has been used in a GFSv17 RETRO-like experiment on WCOSS2. RT tests are being conducted on the URSA.

What compilers / HPCs was it tested with?
Intel

Are the changes covered by regression tests?
YES

Have the ufs-weather-model regression test been run? On what platform?
The RT tests were conducted on the URSA.

• Will the code updates change regression test baseline? - Please show the baseline directory below.

This change will change the baseline.
BASELINE DIRECTORY: /scratch4/NAGAPE/epic/role-epic/UFS-WM_RT/NEMSfv3gfs/develop-20251007

• Please commit the regression test log files in your ufs-weather-model branch
  DONE.

Dependencies

If testing this branch requires non-default branches in other repositories, list them.
Those branches should have matching names (ideally)
https://github.com/RuiyuSun/ccpp-physics/tree/moorthi_cover
ufs-community/ccpp-physics#325

[DusanJovic-NOAA]

@RuiyuSun Please add corresponding ccpp-physics PR as a dependency

[gspetro-NOAA]

We are hoping to process the WM priority GFS v17 parent PR #2940 before the end of the week. Could we get approvals on this UFSATM subcomponent PR?

@RuiyuSun , from Dusan's comment above, it seems like you should add the CCPP physics PR as a dependency in your PR description above.

[RuiyuSun]

@DusanJovic-NOAA @gspetro-NOAA The dependency has been added.

[gspetro-NOAA]

Could we get approvals on this PR so that we can process its high-priority GFSv17 parent WM PR#2940 by the end of the week? Thanks! :)

[grantfirl]

@RuiyuSun The ccpp-physics PR was merged. This is ready to revert .gitmodules and point to the latest ufs/dev commit of ccpp-physics: ufs-community/ccpp-physics@291b4aa

[RuiyuSun]

@RuiyuSun The ccpp-physics PR was merged. This is ready to revert .gitmodules and point to the latest ufs/dev commit of ccpp-physics: ufs-community/ccpp-physics@291b4aa

I see it is pointing to the correct ccpp/physics and branch

[dpsarmie]

I see it is pointing to the correct ccpp/physics and branch

Jong had gone ahead and updated the hash. This just needs to get merged into the UFSATM now that everything is approved and updated. @DusanJovic-NOAA @BrianCurtis-NOAA