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ctsm5.4.020: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions#3756

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ctsm5.4.020: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions#3756
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@slevis-lmwg slevis-lmwg commented Feb 11, 2026

Description of changes

Copied from this post:

  • New default paramfile for clm6
    paramfile = '/glade/work/linnia/CLM6-PPE/ctsm6_cal/paramfiles/ctsm60_params.c260204.nc'
  • New defaults for CAM7_CLM6 land tuning mode
defo_fire_precip_thresh_bet = 1.4d00
rh_hgh = 80.0d00

Specific notes

Contributors other than yourself, if any:
@linniahawkins, @lifang0209, @wwieder

CTSM Issues Fixed (include github issue #):
Fixes #3725

Are answers expected to change (and if so in what way)?
Yes, due to new namelist defaults

  • f19 BGC spinup and HIST run on LMWG_dev#143
  • LDF for C-cycle parameter file changes vs. the 5.4 release #_143 vs #_125
  • TODO run ILAMB for 143 vs 125
  • B1850, B2000 and BHIST cases run for 20 years as part of the 283 series LMWG_dev#141, which has lots of links to various diagnostics

Does this create a need to change or add documentation? Did you do so?
Likely

Testing performed, if any:
I confirmed that I got the correct defaults by submitting (without building and running) two tests:

SMS_D.f10_f10_mg37.I2000Clm60BgcCrop.derecho_gnu.clm-crop
SMS.ne30pg3_t232.I2000Clm60BgcCrop.derecho_intel.clm-clm60cam7LndTuningMode

@slevis-lmwg working locally in /glade/work/slevis/git/upd_nml_defaults

@slevis-lmwg slevis-lmwg self-assigned this Feb 11, 2026
@slevis-lmwg slevis-lmwg added the non-bfb Changes answers (incl. adding tests) label Feb 11, 2026
@github-project-automation github-project-automation bot moved this to Ready to start (or start again) in CTSM: Upcoming tags Feb 11, 2026
@slevis-lmwg slevis-lmwg moved this from Ready to start (or start again) to In progress - master in CTSM: Upcoming tags Feb 11, 2026
@slevis-lmwg slevis-lmwg moved this from Todo to In Progress in LMWG: Sprint Planning Board Feb 11, 2026
@slevis-lmwg slevis-lmwg changed the title Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions Feb 11, 2026
@slevis-lmwg slevis-lmwg added the next this should get some attention in the next week or two. Normally each Thursday SE meeting. label Feb 11, 2026
@slevis-lmwg slevis-lmwg changed the title Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions ctsm5.4.0xx: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions Feb 12, 2026
@ekluzek ekluzek removed the next this should get some attention in the next week or two. Normally each Thursday SE meeting. label Feb 12, 2026
@ekluzek ekluzek changed the title ctsm5.4.0xx: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions ctsm5.4.0XX: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions Feb 12, 2026
@ekluzek ekluzek changed the title ctsm5.4.0XX: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions ctsm5.4.020: Update namelist defaults: paramfile, rh_hgh, defo_fire_precip_thresh_bet, initial conditions Feb 12, 2026
@wwieder wwieder added this to the cesm3_0_beta08 milestone Feb 12, 2026
@slevis-lmwg slevis-lmwg moved this from In Progress to Stalled in LMWG: Sprint Planning Board Feb 12, 2026
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This looks good to me so far. But, there are more things that need to come in, so I won't approve now, nor ask for changes.

for the CLM2 data in the CESM distribution -->
<!-- Plant function types (relative to {csmdata}) -->
<paramfile phys="clm6_0" >lnd/clm2/paramdata/ctsm60_params.c260108.nc</paramfile>
<paramfile phys="clm6_0" >lnd/clm2/paramdata/ctsm60_params.c260204.nc</paramfile>
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There will also be a different parameter file for clm6_0_cam7.0 LND_TUNING_MODE right?

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You may be correct based on @wwieder's instructions to Cecile for coupled simulations. For now I want to wait for a beyond doubt decision.

@slevis-lmwg slevis-lmwg moved this from Stalled to In Progress in LMWG: Sprint Planning Board Feb 14, 2026
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@wwieder this is next in line now. First, we should confirm about

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Higher burned area in coupled simulations

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