ctsm5.4.030

[CTSM Gatekeeper]

*** RESPONSES TO THIS EMAIL WILL NOT BE READ ***
===============================================================
Tag name: ctsm5.4.030
Originator(s): glemieux (Gregory Lemieux, LBNL, glem...@lbl.gov)
Date: Fri Apr 6 04:01:00 PM MDT 2026
One-line Summary: Add FATES namelist option for land use transition logic

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

This pull request adds a new namelist option to allow the user to select
the logic option that controls whether or not FATES kills vegetation
during land use transitions.

Notes of particular relevance for users
---------------------------------------

Changes to CTSM's user interface (e.g., new/renamed XML or namelist variables):
Added fates_lu_transition_logic namelist variable option

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

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
izumi ------- OK

fates tests: (give name of baseline if different from CTSM tagname, normally fates baselines are fates-<FATES TAG>-<CTSM TAG>)
derecho ----- OK
izumi ------- OK

If the tag used for baseline comparisons was NOT the previous tag, note that here:
fates tested against `fates-sci.1.91.4_api.43.0.0-ctsm5.4.029`

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

Changes answers relative to baseline: Yes, fates only, not including satellite phenology mode

Other details
-------------
[Remove any lines that don't apply. Remove entire section if nothing applies.]

List any git submodules updated (cime, rtm, mosart, cism, fates, etc.):
fates: sci.1.91.1_api.43.1.0 -> sci.1.92.0_api.44.0.0

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

https://github.com/ESCOMP/CTSM/pull/3728
https://github.com/NGEET/fates/pull/1489

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