Complete CCPPization of RK microphysics

[jimmielin]

Tag name (required for release branches): TBD - increment Y version
Originator(s): @jimmielin

Description (include the issue title, and the keyword ['closes', 'fixes', 'resolves'] followed by the issue number):

• Finish RK stratiform CCPPization
• Update FCAM4 suite with RK
• Add RK stratiform FPHYStest test suite

Describe any changes made to build system: N/A

Describe any changes made to the namelist: See atmos_phys updates

List any changes to the defaults for the input datasets (e.g. boundary datasets): N/A

List all files eliminated and why: N/A

List all files added and what they do:

A       cime_config/testdefs/testmods_dirs/cam/outfrq_rk_stratiform_derecho/shell_commands
A       cime_config/testdefs/testmods_dirs/cam/outfrq_rk_stratiform_derecho/user_nl_cam
   - add RK FPHYStest

List all existing files that have been modified, and describe the changes:
(Helpful git command: git diff --name-status development...<your_branch_name>)

M       cime_config/testdefs/testlist_cam.xml
   - add RK FPHYStest

M       src/data/registry.xml
   - changes to support RK

If there are new failures (compared to the test/existing-test-failures.txt file),
have them OK'd by the gatekeeper, note them here, and add them to the file.
If there are baseline differences, include the test and the reason for the
diff. What is the nature of the change? Roundoff?

derecho/intel/aux_sima:

derecho/gnu/aux_sima:

If this changes climate describe any run(s) done to evaluate the new
climate in enough detail that it(they) could be reproduced:

CAM-SIMA date used for the baseline comparison tests if different than latest:

[jimmielin]

All GNU regression tests passed except for newly introduced RK test. Will run full suite of tests again prior to final merging after code reviews.

aux_sima_gnu_20250508103342: 14 tests
  SMS_Ln2.ne3pg3_ne3pg3_mg37.FPHYStest.derecho_gnu.cam-outfrq_rk_stratiform_derecho (Overall: DIFF) details:
    FAIL SMS_Ln2.ne3pg3_ne3pg3_mg37.FPHYStest.derecho_gnu.cam-outfrq_rk_stratiform_derecho NLCOMP
    FAIL SMS_Ln2.ne3pg3_ne3pg3_mg37.FPHYStest.derecho_gnu.cam-outfrq_rk_stratiform_derecho BASELINE /glade/campaign/cesm/community/amwg/sima_baselines/latest_gnu: ERROR BFAIL baseline directory '/glade/campaign/cesm/community/amwg/sima_baselines/latest_gnu/SMS_Ln2.ne3pg3_ne3pg3_mg37.FPHYStest.derecho_gnu.cam-outfrq_rk_stratiform_derecho' does not exist
  SMS_Ln9.ne3pg3_ne3pg3_mg37.FCAM4.derecho_gnu.cam-outfrq_se_cslam_analy_ic (Overall: NLFAIL) details:
    FAIL SMS_Ln9.ne3pg3_ne3pg3_mg37.FCAM4.derecho_gnu.cam-outfrq_se_cslam_analy_ic NLCOMP

[nusbaume]

Looks good to me @jimmielin! I did have one request to add a namelist flag to the RK snapshot test, but if it doesn't work then we can just worry about it later. Thanks!

[nusbaume]

I recently realized that when possible we should have the model exit (and thus induce a test failure) whenever the snapshot file comparison finds significant differences. I believe this can be done for this test by adding the following namelist setting to this file:

ncdata_check_err = .true.

Of course if that ends up not working for this particular test please let me know!

[jimmielin]

Thanks @nusbaume! Sadly I can't enable this option because it'll abort the model even with round-off differences. Right now the physics check data has round-off level differences against the snapshot

 ********** Physics Check Data Results **********

 TIMESTEP:            1

 Variable                                          # Diffs  Max Diff   Max Diff loc (rank, col, lev)
 --------                                          -------  --------   -----------------------------
 air_temperature                                       127  0.22E-15   (19,3,22)
 geopotential_height_wrt_surface                       152  0.38E-15   (14,20,19)
 geopotential_height_wrt_surface_at_interface          150  0.42E-15   (10,4,25)
 tendency_of_air_temperature_due_to_model_physics      171  0.10E-14   (19,11,24)
cloud_liquid_water_mixing_ratio_wrt_moist_air_and_condensed_water
                                                      2212  0.85E-15   (7,13,23)
cloud_ice_mixing_ratio_wrt_moist_air_and_condensed_water
                                                      2076  0.76E-15   (7,6,24)
water_vapor_mixing_ratio_wrt_moist_air_and_condensed_water
                                                       131  0.22E-15   (12,4,26)

 ********** End Physics Check Data Results **********

It will run for all the time slices in the snapshot to completion with comparable round-off differences but the model will abort on timestep 1 if ncdata_check_err = .true.

 ERROR: Difference(s) found during ncdata check at /glade/derecho/scratch/hplin/aux_sima_gnu_20250516111902/SMS_Ln2.ne3pg3_ne3pg3_mg37.FPHYStest.derecho_gnu.cam-outfrq_rk_stratiform_derecho.GC.aux_sima_gnu_20250516111902/bld/atm/obj/phys_init/physics_inputs.F90:1056