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The resulting file is assigned to ncdata in user_nl_cam.
This script uses the interpic program provided in CESM source code, but must first be compiled. If you do not already have CESM code, see "Set up CESM3" below.
On casper, in CESM source code, ./components/cam/tools/interpic_new:
Edit Makefile:
l.15 from: LIB_NETCDF := /usr/local/lib
to: LIB_NETCDF := $(NETCDF)/lib
l.18 from: INC_NETCDF := /usr/local/include
to: INC_NETCDF := $(NETCDF)/include
l.99 from: LDFLAGS = -L$(LIB_NETCDF) -lnetcdf
to: LDFLAGS = -L$(LIB_NETCDF) -lnetcdff -lnetcdf
Currently Loaded Modules:
1) ncarenv/23.10 (S) 2) intel/2023.2.1 3) ncarcompilers/1.0.0 4) hdf5/1.12.2 5) netcdf/4.9.2
> gmakeThis should have created the executable ‘interpic’. Alternatively, the instructions below use an existing executable available on casper.
> cd $REPO/inic
> cp /glade/work/emmons/tutorial_Nanjing/VRM_tools/gen_CAMncdata/TEMPLATES/interpic_script_TEMPLATE.sh interpic_script_Nanjing.sh
> vi interpic_script_Nanjing.sh
Edit the script to point to your grid files. This template includes the path to an existing executable of interpic, which is available in the CESM source code.
# USER CHANGES
VRdate="YYMMDD"
VRgridName="ne0np4.NAME.ne30xR"
VRgridLabel="NAME_RESOL"
VRrepoPath="your_repo_path"
# end of USER CHANGES
...
Check there are no errors in the log file. This should have created an ic file with the dimensions of your new grid: cami-mam4_0000-01-01_ne0np4.Nanjing.ne30x8_L32_c240809.ncwith the dimensions of your new grid: cami-mam4_0000-01-01_ne0np4.Nanjing.ne30x8_L32_c240809.nc
On your own computer, you can find ${VRM_tools}/gen_CAMncdata/TEMPLATES/interpic_script_TEMPLATE.sh, and use the interpic executable that you created. You can start with any *.cam.i.* file that you have available.
Regrid 'atmsrf' file
The resulting file is assigned to drydep_srf_file in user_nl_cam.
Copy On casper: copy the template script to your working directory and edit for your grid. Be sure directory $REPO/maps exists.
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Check there are no errors in the log file. This writes atmsrf_ne0np4.Nanjing.ne30x8_240809.nc.
On your own computer: find ${VRM_tools}/gen_atmsrf/TEMPLATES/gen_atmsrf_TEMPLATE.ncl
Create Topography file
The resulting file is assigned to bnd_topo in user_nl_cam.
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Can add option --output_data_directory to specify location of final topography file (be sure it the directory already exists).
This can take several hours.
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(npl) > /glade/work/emmons/cesm_src_derecho/ctsm5.2.007/tools/mksurfdata_esmf/gen_mksurfdata_namelist --res Nanjingres Nanjing_ne30x8 --start-year 1979 --end-year 2026 --ssp-rcp SSP3-7.0 --model-mesh /glade/work/emmons/tutorial_Nanjing/ne0np4.Nanjing.ne30x8/grids/Nanjing_ne30x8_np4_MESH.nc --model-mesh-nx 60482 --model-mesh-ny 1
This creates files like: landuse_timeseries_SSP3-7.0_1979-2026_78pfts.txt and surfdata_Nanjing_ne30x8_SSP3-7.0_1979_78pfts_c240809.namelist.
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This creates the netcdf files that will be used in your simulation, specified in user_nl_clm: fsurdat = '/repo_path/land/surfdata_ ... .nc' and flanduse_timeseries = '/repo_path/land/landuse.timeseries_ ... .nc'. In your $REPO, create a directory 'land' (mkdir $REPO/land) and copy these 2 nc files to it.
> conda deactivate
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