B120 with new paramfile (b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile)

[slevis-lmwg]

Description:
Clone NCAR/cesm_dev#25 and use new paramfile provided by @linniahawkins

Important:

• First I cloned from the sandbox listed in b.e30_beta04.BLT1850.ne30_t232_wgx3.120 cesm_dev#25 and got a cime error in the build phase.
• I got past the cime error when I cloned from /glade/work/hannay/cesm_tags/cesm3_0_beta04, which agrees with the version I see in the case name.

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Case directory:
Locally:
~slevis/cases_LMWG_dev/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile
~slevis/cases_LMWG_dev/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramf_2nd (clone, but see diffs in posts below)

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Sandbox:
Locally:
/glade/work/hannay/cesm_tags/cesm3_0_beta04

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user_nl_ changes:
CLM
paramfile = '/glade/u/home/linnia/ctsm6_ppe/gen_ensembles/jobscripts/test/gen_paramfiles/ctsm5.3.012.Nfix_params.v5.c241212.nc'

Removed the use_c13* and use_c14* = .true. settings because they slow down the simulation.

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SourceMods:
None.

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Diagnostics:
https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile/lnd/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile.11-20-b.e30_beta04.BLT1850.ne30_t232_wgx3.120_11_20/setsIndex.html

https://webext.cgd.ucar.edu/BLT1850/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile/lnd/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramf_2nd.11-20-b.e30_beta04.BLT1850.ne30_t232_wgx3.120_11_20/setsIndex.html

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Output:
Initially output will appear in
/glade/derecho/scratch/slevis/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile/run
then
/glade/derecho/scratch/slevis/archive/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile
and finally
/glade/campaign/cgd/tss/people/slevis/b_cases/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile

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Contacts:
@slevis-lmwg
Also @linniahawkins @wwieder @dlawrenncar

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Extra details:
@linniahawkins' notes about the parameter file:

• Modest reduction in tropical LAI (<2) through changes in froot_leaf, slatop, leafcn for pft 4 only.
• Improve C4 grass survivability by reducing nitrogen costs (KCN parameters, pft 14 only)
• Improve C3 non-arctic grass survivability through modifications to froot_leaf, leafcn, slatop (pft 13 only)
• Corrected FUN_fracfixers bug for pfts 11 and 12 (from 1 to 0.25)
• 5.2 parameter settings for all other pfts and parameters.
• Fang's 5.3 fire parameters.

@linniahawkins tested this on the sparsegrid with I-cases using CRUJRA and this tag and the new nitrogen cost temperature function (b120 uses Houlton).

[linniahawkins]

Thanks Sam, just to verify you are using the 5.3 land initial conditions as in #120 ?

[slevis-lmwg]

@linniahawkins correct, I'm setting
finidat = '/glade/campaign/cesm/cesmdata/inputdata/lnd/clm2/initdata_esmf/ctsm5.3/ctsm53n04ctsm52028_ne30pg3t232_BgcCrop_exice_pSASU.clm60.r.0121-01-01.nc' as found in b120.

[olyson]

@slevis-lmwg , b120 climatology (years 11-20) and trends (1-20) are here:

/glade/derecho/scratch/oleson/ANALYSIS/climo/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_11_20

[slevis-lmwg]

Thank you @olyson
I just started this case's diagnostics against your b120.

[slevis-lmwg]

Diagnostics posted above.

[wwieder]

Wow, climate looks really good and addresses many of the issues we've been discussing in CESM_dev. Specifically, we have large reductions in summer mid-latitude incoming solar, FSDS. Amazon temperature biases are also gone, but we're unable to change persistently low precip biases much.

C-cycle here looks kind of crazy though, with high forest LAIs and global GPP that's >200 PgC/year! Hopefully we can find a middle ground where both climate and C cycle targets seem reasonable.

[wwieder]

@adamrher, maybe it's worth looking at RESTOM in this case?

[adamrher]

RESTOM does a nose dive down to negative values over the first 10 years. Thereafter the ocean cools relative to 120. I wonder what would happen you re-did this run with the land init from around year 10 of this run (or the end of this run).

[slevis-lmwg]

@adamrher I am setting up your suggested simulation as b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramf_2nd not creating a separate lmwg_dev issue for it for now.

user_nl_clm differs as follows:

- use_init_interp = .true.
- finidat = '/glade/campaign/cesm/cesmdata/inputdata/lnd/clm2/initdata_esmf/ctsm5.3/ctsm53n04ctsm52028_ne30pg3t232_BgcCrop_exice_pSASU.clm60.r.0121-01-01.nc'
+ finidat = '/glade/derecho/scratch/slevis/archive/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile/rest/0021-01-01-00000/b.e30_beta04.BLT1850.ne30_t232_wgx3.120_dif_paramfile.clm2.r.0021-01-01-00000.nc'

Land diag. package submitted just now.

[slevis-lmwg]

I posted the 2nd set of diagnostics in the "diagnostics" section above.

[wwieder]

@linniahawkins is fair to say this new parameter file is basically reverting to the CTSM5.2 parameterization?
This may be a gross simplification, however, because we did that in an F-case in #77. How different are those two parameter files?

[linniahawkins]

I light simplification would be to say it's 5.2 for all PFTs except Broadleaf Evergreen Tropical Trees, C4 grass, C3 non-arctic grass.

Differences from 5.2:
Broadleaf Evergreen Tropical Trees: froot_leaf, leafcn, slatop
C3 non-arctic grass: froot_leaf, leafcn, slatop
C4 grass: reducing nitrogen costs

You could say it's roughly 5.2 everywhere except the tropics, where we applied a new tuning approach (reduce LAI without inducing water stress).