ctsm5.3.060

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Tag name: ctsm5.3.060
Originator(s): slevis (Samuel Levis,UCAR/TSS,303-665-1310)
Date: Tue 24 Jun 2025 02:13:05 PM MDT
One-line Summary: Preliminary update of ctsm54 defaults (answer changing)

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

Brings to master some of the work done in #3206, which I merged to the ctsm5.4 alpha branch recently as tag alpha-ctsm5.4.CMIP7.02.ctsm5.3.055.

Allows Cecile to run coupled without having to adjust clm things manually: updates namelist defaults and IC files that have been limited to the ctsm5.4 branch so far.

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.]

[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 #3116 modify snow thermal conductivity defaults
Resolves #3005 ctsm54 initial condition files

Notes of particular relevance for users
---------------------------------------
Changes made to namelist defaults (e.g., changed parameter values):
a3ce6a7 changes the default snow thermal conductivity schemes over lakes and glaciers in clm6 cases

Changes to the datasets (e.g., parameter, surface or initial files):
a75e488 introduces new paramfile to clm6 cases
3a8c432 introduces new f09 and ne30 finidat files for 1850 and 2000 clm6 cases
Reverted preexisting changes to the default raw datasets that came in with #3206 (from the ctsm54 branch)
Reverted changes to the f09 and ne30 fsurdat/landuse files that came in with b1890ac

Changes to documentation:
None, yet

Notes of particular relevance for developers:
---------------------------------------------
Changes to tests or testing:
The next 2 tests are now labeled EXPECTED FAILURE in the RUN phase, to be addressed in issue #3252:
LII2FINIDATAREAS_D_P256x2_Ld1.f09_g17.I1850Clm50BgcCrop.derecho_intel.clm-default--clm-matrixcnOn_ignore_warnings
LII2FINIDATAREAS_D_P256x2_Ld1.f09_g17.I1850Clm50BgcCrop.derecho_intel.clm-default

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

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

derecho - PASS

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

derecho ----- OK (see Changes to tests above)
izumi ------- OK

fates tests: (-c fates-sci.1.84.0_api.40.0.0-ctsm5.3.051 -g fates-sci.1.84.0_api.40.0.0-ctsm5.3.060)
derecho ----- OK
izumi ------- OK

Answer changes
--------------

Changes answers relative to baseline: Yes

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

See above in changes to namelist defaults and datasets for the sources of change.

Other details
-------------
Pull Requests that document the changes (include PR ids):
https://github.com/ESCOMP/ctsm/pull/3268

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