ctsm5.4.040

[CTSM Gatekeeper]

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Tag name: ctsm5.4.040
Originator(s): slevis (Samuel Levis,UCAR/TSS,303-665-1310)
Date: Wed May 20 04:13:57 PM MDT 2026
One-line Summary: Paramfile updates

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

Updating the clm6 paramfiles.

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

[ ] clm5_0

[ ] ctsm5_0-nwp

[ ] clm4_5


Bugs fixed
----------
List of CTSM issues fixed (include CTSM Issue # and description) [one per line]:
Resolves #3659

Notes of particular relevance for users
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Changes to the parameter file (output of tools/param_utils/compare_paramfiles):
Changing two paramfiles and adding a new one for hillslope hydrology in namelist_defaults

Contributors:
@wwieder @linniahawkins

Testing summary:
----------------
[PASS means all tests PASS; OK means tests PASS other than expected fails.]

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

derecho - OK (2 expected failures)

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: clm6
- what platforms/compilers: all
- nature of change: larger than roundoff, possibly climate changing

If this tag changes climate list the run(s) done to evaluate the new
climate. Preferably in https://github.com/NCAR/LMWG_dev (or give details below)
- LMWG_dev issue number(s):
https://github.com/NCAR/LMWG_dev/issues/164
https://github.com/NCAR/LMWG_dev/issues/167
Not changing finidat files in the defaults at this time due to various non-standard things in these test simulations.

Other details
-------------
Pull Requests that document the changes (include PR ids):
https://github.com/ESCOMP/ctsm/pull/4029

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