ctsm5.4.020

[CTSM Gatekeeper]

*** RESPONSES TO THIS EMAIL WILL NOT BE READ ***
===============================================================
Tag name: ctsm5.4.020
Originator(s): slevis (Samuel Levis,UCAR/TSS,303-665-1310)
Date: Thu Feb 19 08:28:59 AM MST 2026
One-line Summary: Address carbon cycle and fire biases in CESM3 development runs by updating namelist defaults

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

- New defaults for lnd_tuning_mode="clm6_0_cam7.0"
defo_fire_precip_thresh_bet = 1.4d00
rh_hgh = 80.0d00

- New default paramfiles
for clm6: /glade/work/linnia/CLM6-PPE/ctsm6_cal/paramfiles/ctsm60_params.c260204.nc
for lnd_tuning_mode="clm6_0_cam7.0": /glade/u/home/slevis/paramfiles/iss3725_forFang/ctsm60_params.c260204.cesm3-01.nc
The latter got renamed to ctsm60-cam70_params.c260204.nc and it increases pft-specific values of "rswf_max" and "rswf_min"

- New default finidat for ne30 and 1850
/glade/derecho/scratch/wwieder/archive/ctsm5.4.015_BGCcrop_ne30_144_pSASU/rest/0181-01-01-00000/ctsm5.4.015_BGCcrop_ne30_144_pSASU.clm2.r.0181-01-01-00000.nc

All new files got moved to /inputdata and got rimported.

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.)

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

[ ] clm6_0

[ ] clm5_0

[ ] ctsm5_0-nwp

[ ] clm4_5


Bugs fixed
----------
List of CTSM issues fixed (include CTSM Issue # and description) [one per line]:
Fixes #3725

Notes of particular relevance for users
---------------------------------------
Changes made to namelist defaults (e.g., changed parameter values):
Listed above.

Changes to the parameter file (output of tools/param_utils/compare_paramfiles):
Listed above.

Changes to documentation:
Not, yet.

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 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: Clm6
- what platforms/compilers: all
- nature of change: larger than roundoff due to changes in defaults

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/141
https://github.com/NCAR/LMWG_dev/issues/143

Other details
-------------
Pull Requests that document the changes (include PR ids):
https://github.com/ESCOMP/ctsm/pull/3756

===============================================================
===============================================================