ctsm5.4.043

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Tag name: ctsm5.4.043
Originator(s): wwieder (Will Wieder, UCAR/TSS)
Date: Wed Jun 3 04:59:46 PM MDT 2026
One-line Summary: Overflow respiration bug fixes

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

Same as title.

Significant changes to scientifically-supported configurations
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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.)

[Put an [X] in the box for any configuration with significant answer changes.]

[X] clm6_0 MIMICS only

[ ] clm5_0

[ ] ctsm5_0-nwp

[ ] clm4_5


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

List of CTSM issues fixed (include CTSM Issue # and description) [one per line]:
Resolves #3491

Notes of particular relevance for users
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Substantial timing or memory changes:
A new failure, possibly a fluke, I opened an issue about it regardless:
FAIL ERP_P64x2_D_Ld5.f10_f10_mg37.I2000Clm50Sp.derecho_gnu.clm-default--clm-nofireemis MEMLEAK memleak detected, memory went from 1039.200000 to 1168.030000 in 0 days

Contributors:
@katierocci
@slevis-lmwg

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

Changes to tests or testing:
See note in memory changes above.

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

[PASS means all tests PASS; OK means tests PASS other than expected fails.]

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

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

Answer changes
--------------
Changes answers relative to baseline: Yes

Summarize any changes to answers, i.e.,
- what code configurations: MIMICS only
- what platforms/compilers: all
- nature of change: larger than roundoff, reduces N limitation in MIMICS simulations

Other details
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Pull Requests that document the changes (include PR ids):
https://github.com/ESCOMP/ctsm/pull/4014

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