ctsm5.4.008

[CTSM Gatekeeper]

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Tag name: ctsm5.4.008
Originator(s): swensosc (Sean Swenson)
Date: Mon Jan 12 11:19:38 PM MST 2026
One-line Summary: Add a correction for oversaturated soil layers in SoilWaterMovement

Purpose and description of changes
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Add a correction for oversaturated soil layers immediately after the soil water flux calculation in SoilWaterMovementMod.

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.]

[ ] clm6_0

[ ] clm5_0

[ ] ctsm5_0-nwp

[ ] clm4_5


Bugs fixed
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List of CTSM issues fixed (include CTSM Issue # and description) [one per line]:
Second checkbox in #3879 -- placeholder issue soil water movement

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

Caveats for developers (e.g., code that is duplicated that requires double maintenance):


Testing summary: regular
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[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

If the tag used for baseline comparisons was NOT the previous tag, note that here:

Answer changes
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Changes answers relative to baseline: Yes! Changes in most fields

Summarize any changes to answers, i.e.,
- what code configurations: All
- what platforms/compilers: All
- nature of change (larger than roundoff/same climate)

If this tag changes climate list the run(s) done to evaluate the new
climate (from https://github.com/NCAR/LMWG_dev)
- issue number: 132

URL for LMWG diagnostics output used to validate new climate:
- https://webext.cgd.ucar.edu/I20TR/ctsm5.4.004_bgc_f09_131_HIST/lnd/ctsm5.4.004_bgc_f09_Oversaturation_131b_HIST_1994_2023_vs_ctsm5.4.004_bgc_f09_131_HIST_1994_2023/website/


Other details
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Pull Requests that document the changes (include PR ids):
(https://github.com/ESCOMP/ctsm/pull)
#3683 -- Oversaturation

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