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ctsm5.4.027: Important coupled model final answer changes: param file and n_melt_glcmec #3810

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ctsm5.4.027: Important coupled model final answer changes: param file and n_melt_glcmec #3810

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3e79994
Fix for #3799 so that lnd_tuning_mode can be used for the paramfile
ekluzek Mar 4, 2026
220a9b1
Here's one way to get DATM_CO2_TSERIES settings just set for certain …
ekluzek Mar 12, 2026
571e232
Merge branch 'master' into important_final_answer_changes
ekluzek Mar 12, 2026
a2a2309
Merge tag 'ctsm5.4.025' into important_final_answer_changes
ekluzek Mar 16, 2026
2ccdbd9
Revert "Here's one way to get DATM_CO2_TSERIES settings just set for …
ekluzek Mar 19, 2026
68ea7b7
Change n_melt_glcmec for clm6_0 fixing #3824
ekluzek Mar 19, 2026
5423f3f
Put the 2015 ISSP finidat file inside namelist_defaults, so it can be…
ekluzek Mar 19, 2026
59e94bd
Remove finidat file as it's set in the namelist defaults now
ekluzek Mar 19, 2026
0ef99c2
Remove the user_nl_clm, because finidat files are now in namelist def…
ekluzek Mar 19, 2026
6326827
Some adjustments to get the 2015 finidat working correctly
ekluzek Mar 20, 2026
370da18
Correct use_excess_ice for 2015 finidat so will work with clm6_0 and …
ekluzek Mar 20, 2026
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1 change: 1 addition & 0 deletions bld/CLMBuildNamelist.pm
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Original file line number Diff line number Diff line change
Expand Up @@ -2264,6 +2264,7 @@ sub setup_logic_params_file {

add_default($opts, $nl_flags->{'inputdata_rootdir'}, $definition, $defaults, $nl, 'paramfile',
'phys'=>$nl_flags->{'phys'},
'lnd_tuning_mode'=>$nl_flags->{'lnd_tuning_mode'},
'use_flexibleCN'=>$nl_flags->{'use_flexibleCN'} );
}

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20 changes: 19 additions & 1 deletion bld/namelist_files/namelist_defaults_ctsm.xml
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Expand Up @@ -532,6 +532,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
<!-- For clm4_5, make this effectively unlimited -->
<int_snow_max phys="clm4_5" >1.e30</int_snow_max>

<n_melt_glcmec phys="clm6_0" >1.0d00</n_melt_glcmec>
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@slevis-lmwg slevis-lmwg Mar 20, 2026

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I thought that we might have applied this value only in coupled cases, but I see how it probably makes more sense to make the change for all clm6.

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@ekluzek ekluzek Mar 20, 2026

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Yeah, since the CISM folks want it changed, I think it should be changed for both coupled and uncoupled. That way any offline spinup with CISM will be consistent with coupled. And in general we want uncoupled cases to be the same as coupled unless there are really good reasons not to.

<n_melt_glcmec >10.0d00</n_melt_glcmec>
<n_melt_glcmec phys="clm4_5" >10.0</n_melt_glcmec>

Expand Down Expand Up @@ -764,7 +765,7 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
<init_interp_how_close>61</init_interp_how_close>

<!-- What simulation years can find initial conditions to interpolate from (find one that's within the how_close years above)-->
<init_interp_sim_years>1850,1979,2000,2003,2013</init_interp_sim_years>
<init_interp_sim_years>1850,1979,2000,2003,2013,2015</init_interp_sim_years>

<!--

Expand Down Expand Up @@ -801,6 +802,9 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
<use_init_interp use_cndv=".false." use_fates=".false." sim_year="2013" lnd_tuning_mode="clm5_0_cam7.0"
maxpft="17" use_cn=".false." use_crop=".false." hgrid="ne0np4CONUS.ne30x8" >.true.</use_init_interp>

<!-- 2015 for CMIP6 SSP future scenario cases -->
<use_init_interp use_cndv=".false." use_fates=".false." sim_year="2015" >.true.</use_init_interp>

<!--
clm6_0 physics with CAM7.0 grids...
-->
Expand Down Expand Up @@ -1134,6 +1138,12 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
>hgrid=ne0np4CONUS.ne30x8 maxpft=17 mask=tx0.1v2 use_cn=.false. use_crop=.false. irrigate=.true. glc_nec=10 do_transient_pfts=.false. use_excess_ice=.false.
</init_interp_attributes>

<!-- 2015 IC's - used for CMIP6 SSP future scenario cases -->
<!-- Use both for SP and BGC, crop on/off, all grids, all tuning modes, but without excess_ice-->
<init_interp_attributes sim_year="2015" use_cndv=".false." use_fates=".false."
>hgrid=0.9x1.25 maxpft=78 mask=gx1v7 use_cn=.true. use_crop=.true. irrigate=.true. use_excess_ice=.false. glc_nec=10 do_transient_pfts=.true. lnd_tuning_mode=clm5_0_cam6.0
</init_interp_attributes>


<!-- matches for clm5_0 physics with CAM6.0 -->
<init_interp_attributes sim_year="2000" use_cndv=".false." use_fates=".false." lnd_tuning_mode="clm5_0_cam6.0"
Expand Down Expand Up @@ -1616,6 +1626,14 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
lnd_tuning_mode="clm5_0_cam7.0" use_init_interp=".true."
>lnd/clm2/initdata_map/clmi.FHISTSp.2013-01-01.ne0CONUSne30x8_mt12_simyr2013_c200806.nc
</finidat>

<!-- 2015 for CMIP6 SSP future scenario cases -->
<finidat hgrid="0.9x1.25" maxpft="78" mask="gx1v7" use_cn=".true." use_cndv=".false." use_fates=".false."
ic_ymd="20150101" sim_year="2015" do_transient_pfts=".true." use_excess_ice=".false."
ic_tod="0" glc_nec="10" use_crop=".true." irrigate=".true."
lnd_tuning_mode="clm5_0_cam6.0" use_init_interp=".true."
>cesm2_init/b.e21.BHIST.f09_g17.CMIP6-historical.010/2015-01-01/b.e21.BHIST.f09_g17.CMIP6-historical.010.clm2.r.2015-01-01-00000.nc
</finidat>
<!-- Repeat above for clm6_0 -->
<!-- slevis-lmwg, ekluzek 2024/10/11: do_transient_pfts was removed here to bypass a bug that doesn't allow
do_transient_pfts=.true. when use_init_interp=.false. -->
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2 changes: 0 additions & 2 deletions cime_config/testdefs/testmods_dirs/clm/ExcessIceStartup_output_sp_exice/user_nl_clm
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@@ -1,3 +1 @@
use_excess_ice = .true.
finidat = '$DIN_LOC_ROOT/lnd/clm2/initdata_map/clmi.I1850Clm50Sp.0003-01-01.0.9x1.25_gx1v7_exice_simyr1850_c221205.nc'
use_init_interp = .true.
3 changes: 0 additions & 3 deletions cime_config/testdefs/testmods_dirs/clm/ciso_dec2050Start/user_nl_clm
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