ctsm5.4.001

[CTSM Gatekeeper]

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Tag name: ctsm5.4.001
Originator(s): samrabin (Sam Rabin, UCAR/TSS)
Date: Mon Dec 8 10:10:15 MST 2025
One-line Summary: Merge b4b-dev

Purpose and description of changes
----------------------------------

Merge b4b-dev

Includes these PRs:
- [ESCOMP/CTSM Pull Request #3299: Add a testmod that allows transient ERI tests to work](https://github.com/ESCOMP/CTSM/pull/3299)
- [ESCOMP/CTSM Pull Request #3627: Carbon isotopes in streams](https://github.com/ESCOMP/CTSM/pull/3627)
- [ESCOMP/CTSM Pull Request #3640: Restructure Carbon Isotope streams for OpenMP](https://github.com/ESCOMP/CTSM/pull/3640)
- [ESCOMP/CTSM Pull Request #3645: Fix eri transient jump tests by having mosart history daily by ekluzek](https://github.com/ESCOMP/CTSM/pull/3645)


Significant changes to scientifically-supported configurations
--------------------------------------------------------------

Does this tag change answers significantly for any of the following physics configurations?
(Details of any changes will be given in the "Answer changes" section below.)

[ ] clm6_0

[ ] clm5_0

[ ] ctsm5_0-nwp

[ ] clm4_5


Bugs fixed
----------

List of CTSM issues fixed (include CTSM Issue # and description):
- [ESCOMP/CTSM Issue #3284: ERI tests fail for transient cases](https://github.com/ESCOMP/CTSM/issues/3284)
- [ESCOMP/CTSM Issue #3483: aux_clm has no IHistClm60BgcCropCrujra tests](https://github.com/ESCOMP/CTSM/issues/3483)
- [ESCOMP/CTSM Issue #3564: Update git-fleximod to v1.1.1](https://github.com/ESCOMP/CTSM/issues/3564)
- [ESCOMP/CTSM Issue #3599: Update CDEPS to cdeps1.0.84 or later](https://github.com/ESCOMP/CTSM/issues/3599)


Notes of particular relevance for developers:
---------------------------------------------

Changes to tests or testing:
- New test ERI_D_Ld20.f10_f10_mg37.IHistClm60Bgc.izumi_nag.clm-default--clm-midDecStart--clm-allowTransientYearJump


Testing summary:
----------------

build-namelist tests (if CLMBuildNamelist.pm has changed):

derecho - OK

regular tests (aux_clm: https://github.com/ESCOMP/CTSM/wiki/System-Testing-Guide#pre-merge-system-testing):

derecho ----- OK
izumi ------- OK


Other details
-------------

List any git submodules updated:
- mizuRoute: cesm-coupling.n03_v2.2.0 to v3.0.1
- cime: cime6.1.128 to cime6.1.144
- cmeps: cmeps1.1.20 cmeps1.1.24
- cdeps: cdeps1.0.81 to cdeps1.0.84

Pull Requests that document the changes:
- [ESCOMP/CTSM Pull Request #3652: b4b-dev merge 2025-12-05](https://github.com/ESCOMP/CTSM/pull/3652)

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