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Originator(s): nusbaume Description (include issue title and the keyword ['closes', 'fixes', 'resolves'] and issue number): Add namelist modifications and additional helper schemes in order to run the full CAM4 physics suite in CAM-SIMA in aquaplanet mode. List all namelist files that were added or changed: A schemes/radiation_utils/radiative_gas_concentrations_namelist.xml - New namelist variable to set the concentrations of radiatively active gases. M schemes/cloud_fraction/compute_cloud_fraction_namelist.xml M schemes/gravity_wave_drag/gw_common_namelist.xml M schemes/radiation_utils/solar_irradiance_data_namelist.xml M schemes/rrtmgp/rrtmgp_constituents_namelist.xml M schemes/zhang_mcfarlane/zm_conv_options_namelist.xml - Add new namelist values for CAM4 and/or aquaplanet CAM-SIMA configurations. List all files eliminated and why: N/A List all files added and what they do: A schemes/radiation_utils/radiative_gas_concentrations.F90 A schemes/radiation_utils/radiative_gas_concentrations.meta - New scheme which sets the global concentrations of radiatively active gases using hardcoded namelist values. A schemes/utilities/set_surface_coupling_vars.F90 A schemes/utilities/set_surface_coupling_vars.meta - New scheme which sets the outgoing (i.e. `cam_out`) coupler variables. List all existing files that have been modified, and describe the changes: (Helpful git command: `git diff --name-status development...<your_branch_name>`) M schemes/rasch_kristjansson/prognostic_cloud_water.F90 - Move subroutine call outside of loop to improve performance (found during CAM4 aquaplanet debugging). M suites/suite_cam4.xml - Update CAM4 suite to allow for a complete CAM4 physics run in CAM-SIMA when in aquaplanet mode. M suites/suite_cam7.xml - Add commented-out 'set_surface_coupling_vars' scheme, as it will be needed for an eventual CAM7 simulation in CAM-SIMA. List all automated tests that failed, as well as an explanation for why they weren't fixed: Is this an answer-changing PR? If so, is it a new physics package, algorithm change, tuning change, etc? Yes, at least for full physics CAM4 aquaplanet simulations. This PR introduces new schemes and namelist values to the CAM4 physics suite, which is what allows this configuration to run in CAM-SIMA. If yes to the above question, describe how this code was validated with the new/modified features: Performed a short, three month run and examined the model output, at least for some generic state variables (U,V,T,Q,PS). All of the results seemed reasonable, and the model successfully ran to completion. --------- Co-authored-by: peverwhee <courtneyp@ucar.edu> Co-authored-by: Cheryl Craig <cacraig@ucar.edu> Co-authored-by: Courtney Peverley <courtneyp@izumi.cgd.ucar.edu> Co-authored-by: John Truesdale <jet@ucar.edu> Co-authored-by: Haipeng Lin <hplin@ucar.edu> Co-authored-by: Jian Sun <sunjian@ucar.edu> Co-authored-by: Haipeng Lin <myself@jimmielin.me>
peverwhee
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Jan 29, 2026
jimmielin
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Jan 29, 2026
cacraigucar
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Feb 12, 2026
Merge development into main (ESCOMP#361)
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Tag name: atmos_phys0_21_000
Originator(s): nusbaume
List all development PR numbers included in this PR and the title of each:
Update CAM4 physics suite for SIMA aquaplanet configurations (#349)