n1850.ne30_tn14.hybrid_fatessp_c84.5.20250207

[oyvindseland]

Purpose:

Test tuning of simulation n1850.ne30_tn14.hybrid_fatessp.20241219. clubb_c8 set to 4.5 comparable to recent simulations for CESM3alpha

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Description:

To get the code

git clone https://github.com/NorESMhub/NorESM.git
cd NorESM
git checkout noresm2_5_alpha08d
./bin/git-fleximod update

• NOTE: a memory leak is present in the run and hits agains the node limit when running past 11 years.
  See memory leak in n1850 case NorESM#550

• create_newcase commnad

 ./create_newcase --case <user_case_path>/n1850.ne30_tn14.hybrid_fatessp.20241204 \\
 --compset 1850_CAM70%LT%NORESM%CAMoslo_CLM60%FATES-SP_CICE_BLOM%ECO_MOSART_DGLC%NOEVOLVE_SWAV_SESP  \\
 --res ne30pg3_tn14 \\
 --project nn9039k --run-unsupported --mach betzy 

• user_nl_cam

 use_aerocom = .false.
 interpolate_nlat   = 192
 interpolate_nlon   = 288
 interpolate_output = .true.
 history_aerosol = .false. 
 zmconv_c0_lnd  =  0.0075D0
 zmconv_c0_ocn  =  0.0300D0
 zmconv_ke =  5.0E-6
 zmconv_ke_lnd =  1.0E-5
 clim_modal_aero_top_press =  1.D-4
clubb_c8   = 4.5
 bndtvg = '/cluster/shared/noresm/inputdata/atm/cam/ggas/noaamisc.r8.nc'

• user_nl_clm
  Add the following to user_nl_clm

fates_paramfile='/cluster/work/users/rosief/git/NorESM_MEGAN_test/components/clm/src/fates/parameter_files/fates_params_megan_twostream.nc'
z0param_method='ZengWang2007'

• xmlchange commands

./xmlchange NTASKS=1920
./xmlchange NTASKS_OCN=256
./xmlchange ROOTPE=0
./xmlchange ROOTPE_OCN=1920
./xmlchange BLOM_VCOORD=cntiso_hybrid,BLOM_TURBULENT_CLOSURE=
./xmlchange RUN_TYPE=hybrid
./xmlchange RUN_REFCASE=n1850.ne30_tn14.hybrid_fatessp.20241204
./xmlchange RUN_REFDATE=0071-01-01
./xmlchange GET_REFCASE=FALSE
./xmlchange STOP_OPTION=nyears
./xmlchange STOP_N=7
./xmlchange RESUBMIT=4
./xmlchange --subgroup case.run JOB_WALLCLOCK_TIME=48:00:00
./xmlchange --subgroup case.st_archive JOB_WALLCLOCK_TIME=06:00:00

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Compset long name
1850_CAM70%LT%NORESM%CAMoslo_CLM60%FATES-SP_CICE_BLOM%ECO_MOSART_DGLC%NOEVOLVE_SWAV_SESP

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Model grid long name
a%ne30np4.pg3_l%ne30pg4.pg3_oi%tnx1v4_r%r05_w%null_z%null_g%gris4_m%tnx1v4

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Case directory:

• Locally on betzy:
  /cluster/projects/nn9560k/oyvinds/NorESM2.5_alpha08/cases/n1850.ne30_tn14.hybrid_fatessp_c84.5.20250207

• On github:
  https://github.com/NorESMhub/noresm_simulations/tree/$CASE

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Code version on github (either NorESMhub or user's fork):

• On github: https://github.com/NorESMhub/NorESM/releases/tag/noresm2_5_alpha08d
• https://github.com/username/noresm/tree/<code_version>

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Diagnostics:

• Diags (if available):
• https://ns2345k.web.sigma2.no/datalake/diagnostics/ADF/plots/n1850.ne30_tn14.hybrid_fatessp_c84.5.20250207_1_25_vs_n1850.ne30_tn14.hybrid_fatessp.20241219_1_25/
• https://ns2345k.web.sigma2.no/datalake/diagnostics/ADF/plots/n1850.ne30_tn14.hybrid_fatessp_c84.5.20250207_1_25_vs_Obs/
• https://ns9560k.web.sigma2.no/datalake/diagnostics/noresm/oyvinds/n1850.ne30_tn14.hybrid_fatessp_c84.5.20250207/

AeroVal

• https://aeroval-test.met.no/andrear/pages/intercomp/?project=NorESM3-dev&experiment=Tuning_20241219_non-obs&station=ALL

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Output:

• Raw output on nird (if still available): /datalake/NS9560K/noresm3/cases/n1850.ne30_tn14.hybrid_fatessp_c84.5.20250207
• CAM Climos:

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Contacts:
@oyvindseland

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Extra details:
Only set restart files for end of each simulation, i.e. every 7 years

[oyvindseland]

Added link to diagnostics. The ocean / sea-ice/ clm diagnostics are for years 1-35. Atmosphere Year 1-25. The simulation will be run for another 30 years.
Despite the overall colder temperature compared to n1850.ne30_tn14.hybrid_fatessp.20241219, this simulation switches to a SH ice minimum stage earlier in simulation starting around year 25-30 compared to around year 40-45 in the original The overall values for this minimum state looks comparable to each other. Since it looks like the SH ice may have two states also in this simulation a hypothesized link between lower short term variability in long wave radiation seems less likely.
The lower variability is reflected however in a reduced ENSO variability. In particular given the low ENSO variability and dry Amazon this tuning is likely not a good solution at the present stage but is continued to see if the long term sea-ice variability is a robust feature.