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OpenSep 17, 2026
Due by September 30, 2026
•Last updated Freeze for the list of scientifically supported compsets for CTSM for I compsets
Sp
FatesNoComp
FatesSP
MizuRoute
Hillslope
all need to be frozen for answer changes by this date.
Bgc and BgcCrop already frozen in beta08
We will allow non-standard things that are default off to change answers. But, everything that will affect CTSM simulations MUST not-change answers without approval.
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CTSM warm start coupling with single column mode. New ne3np4 boundary data for use with SCAM-SE.
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open (in progress).Deprecate clm5_1 physics with ctsm5.2.0_ only externals remain
externalissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingStatus: Open.#2379 In ESCOMP/CTSM;Move the soil erodibility dataset dust emission source function from CAM to CTSM
code healthimproving internal code structure to make easier to maintain (sustainability)improving internal code structure to make easier to maintain (sustainability)enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityStatus: Open.#1836 In ESCOMP/CTSM;CNFUNInit appears to have some problems
bugsomething is working incorrectlysomething is working incorrectlypriority: lowBackground task that doesn't need to be done right away.Background task that doesn't need to be done right away.scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.Determination of htvp looks wrong
bugsomething is working incorrectlysomething is working incorrectlyscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.NPP_BURNEDOFF doesn't seem to be restarting correctly
bugsomething is working incorrectlysomething is working incorrectlypriority: lowBackground task that doesn't need to be done right away.Background task that doesn't need to be done right away.scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.New NEON initial conditions needed
bugsomething is working incorrectlysomething is working incorrectlyscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceusabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Tests that don't have CTSM history output
bugsomething is working incorrectlysomething is working incorrectlytestingadditions or changes to testsadditions or changes to testsStatus: Open.Two failing tests in the build-namelist tester since ctsm5.3.014
bugsomething is working incorrectlysomething is working incorrectlyinvestigationNeeds to be verified and more investigation into what's going on.Needs to be verified and more investigation into what's going on.Status: Open.Update the fire-emissions namelist for our testing to correspond with the settings for coupled cases
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitynon-b4bChanges answers (incl. adding tests)Changes answers (incl. adding tests)testingadditions or changes to testsadditions or changes to testsStatus: Open.CAM FXHIST tests that fail
b4bbit-for-bitbit-for-bitbugsomething is working incorrectlysomething is working incorrectlytestingadditions or changes to testsadditions or changes to testsusabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Rework list of compsets to align with the compsets needed for the ctsm6.0.0 release
b4bbit-for-bitbit-for-bitpriority: highHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceusabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Update dataset read code (for FATES) to be compatible with the CMIP7 datasets
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityFATESA change needed for FATES that doesn't require a FATES API update.A change needed for FATES that doesn't require a FATES API update.priority: highHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.Frozen FATES release tag to be used for CESM3.0 release
FATESA change needed for FATES that doesn't require a FATES API update.A change needed for FATES that doesn't require a FATES API update.scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.Bring in new CMIP7 compsets, user-mods and testing to easily give the CMIP7 output for experiments
b4bbit-for-bitbit-for-bitenhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.Validate the CMOR output of CTSM for CMIP7
b4bbit-for-bitbit-for-bitenhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityexternalissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.Remove the CMIP6 usermods for history output fields
b4bbit-for-bitbit-for-bitcode healthimproving internal code structure to make easier to maintain (sustainability)improving internal code structure to make easier to maintain (sustainability)usabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.#3656 In ESCOMP/CTSM;Add testing of the CMIP7 and CMOR workflow
b4bbit-for-bitbit-for-bitenhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitytestingadditions or changes to testsadditions or changes to testsusabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.#3657 In ESCOMP/CTSM;post5.4: Use the correct C13/C14 atm ratio in the code more
non-b4bChanges answers (incl. adding tests)Changes answers (incl. adding tests)scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Draft (not ready).After ifx NaN work: Need to check some fixed tests
investigationNeeds to be verified and more investigation into what's going on.Needs to be verified and more investigation into what's going on.priority: highHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsStatus: Open.Are namelist defaults set correctly, specifically related to megan settings for B1850 case?
b4bbit-for-bitbit-for-bitbugsomething is working incorrectlysomething is working incorrectlycode healthimproving internal code structure to make easier to maintain (sustainability)improving internal code structure to make easier to maintain (sustainability)usabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Fill the Greenland snow hole: update ICs, remove old CRUJRA option
bugsomething is working incorrectlysomething is working incorrectlyscienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.CTSM Changes Needed with a new Ocean Mask t233
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityexternalissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackinginvestigationNeeds to be verified and more investigation into what's going on.Needs to be verified and more investigation into what's going on.non-b4bChanges answers (incl. adding tests)Changes answers (incl. adding tests)scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.Make offline 1850 compsets closer to when coupled to CAM by using CO2 from datasets rather than hardcoded values
non-b4bChanges answers (incl. adding tests)Changes answers (incl. adding tests)scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceusabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Create a clm60cam6LndTuningMode_CPLHIST_ProgCO2 testmod to ensure prognostic CO2 handling happens correctlty
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitytestingadditions or changes to testsadditions or changes to testsStatus: Open.