Defining a custom grid
In order to use the CAM6 reanalysis to force the t13 ocean/sea ice grid,
a f09_t13 grid needs to be defined within CIME.
The Model grids page in the CIME documentation provides instructions for doing so.
Available SCRIP grid files
CIME doesn’t provide functionality to create Spherical Coordinate Remapping and Interpolation Package (SCRIP) since it is a Los Alamos product (Jones, 1999).
SCRIP files are the input files for the mapping utility, as described in Step 1 of Adding grids. But, there should be SCRIP files for f09 and t13 already on GLADE since those grids are already part of CESM. Let’s start searching.
vi /glade/p/cesm/cseg/mapping/grids/README
(2021-06-23)
Old files here have been moved to the inputdata directory:
inputdata/share/scripgrids
Moving forward, all important scrip grid files (e.g., those that relate to
standard CESM model resolutions) should be put in that directory and checked
in to the inputdata repository. (ESMF mesh files should be put in
inputdata/share/meshes.)
f09
The f09 scrip grids files are here:
/glade/p/cesm/cseg/inputdata/share/scripgrids/0.9x1.25_EW_SCRIP_desc.181018.nc
/glade/p/cesm/cseg/inputdata/share/scripgrids/0.9x1.25_NS_SCRIP_desc.181018.nc
/glade/p/cesm/cseg/inputdata/share/scripgrids/0.9x1.25_SCRIP_desc.181018.nc
t13
The t13 scrip grid files are here:
/glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v3_211102.nc
Using f05_t12 as a starting point
The most similar existing grid combination to the f09_t13 grid that we are
attempting to create is the f05_t12 grid. In
/glade/work/johnsonb/cesm2_1_3/cime/config/cesm/config_grids.xml, there are
two relevant sections regarding f05_T12:
<!-- Line 375 -->
<model_grid alias="f05_t12">
<grid name="atm">0.47x0.63</grid>
<grid name="lnd">0.47x0.63</grid>
<grid name="ocnice">tx0.1v2</grid>
<mask>tx0.1v2</mask>
</model_grid>
<!-- Line 1586 -->
<gridmap atm_grid="0.47x0.63" ocn_grid="tx0.1v2">
<map name="ATM2OCN_FMAPNAME">cpl/cpl6/map_fv0.47x0.63_to_tx0.1v2_aave_da_090218.nc</map>
<map name="ATM2OCN_SMAPNAME">cpl/cpl6/map_fv0.47x0.63_to_tx0.1v2_bilin_da_090218.nc</map>
<map name="ATM2OCN_VMAPNAME">cpl/cpl6/map_fv0.47x0.63_to_tx0.1v2_bilin_da_090218.nc</map>
<map name="OCN2ATM_FMAPNAME">cpl/cpl6/map_tx0.1v2_to_fv0.47x0.63_aave_da_090218.nc</map>
<map name="OCN2ATM_SMAPNAME">cpl/cpl6/map_tx0.1v2_to_fv0.47x0.63_aave_da_090218.nc</map>
</gridmap>
It appears that we might not want patch mapping because the only ocean grids
that have patch mapping in config_grids.xml are these two gx1v6 and
gx3v7 grid (out of scores of other grid configurations).
<!-- Line 1578 -->
<gridmap atm_grid="0.47x0.63" ocn_grid="gx1v6">
<!-- Line 1833 -->
<gridmap atm_grid="T31" ocn_grid="gx3v7">
Interesting note: no domain file
There is no domain entry defined for the f05_t12 grid:
<!-- Line 1119 -->
<domain name="0.47x0.63">
<nx>576</nx> <ny>384</ny>
<file grid="atm|lnd" mask="gx1v6">domain.lnd.fv0.47x0.63_gx1v6.090407.nc</file>
<file grid="ocnice" mask="gx1v6">domain.ocn.0.47x0.63_gx1v6_090408.nc</file>
<file grid="atm|lnd" mask="gx1v7">domain.lnd.fv0.47x0.63_gx1v7.180521.nc</file>
<file grid="ocnice" mask="gx1v7">domain.ocn.fv0.47x0.63_gx1v7.180521.nc</file>
<desc>0.47x0.63 is FV 1/2-deg grid:</desc>
</domain>
Generate mapping files
Mapping files should be generated for:
atm <-> ocn
atm <-> wav
lnd <-> rof
lnd <-> glc
ocn <-> wav
rof -> ocn
by calling gen_cesm_maps.sh in
$CIMEROOT/tools/mapping/gen_mapping_files/.
Build the executable
The initial step is to build the ESMF_RegridWeightGenCheck executable.
module load esmf_libs/8.0.0
module load esmf-8.0.0-ncdfio-uni-O
gmake
ls -lart ../
[ ... ]
drwxr-xr-x 3 johnsonb ncar 4096 Jan 4 06:58 .
-rwxr-xr-x 1 johnsonb ncar 1624728 Jan 4 06:58 ESMF_RegridWeightGenCheck
Run the script
The next step is to run the gen_cesm_maps.sh script with the appropriate
options:
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files
qsub -I -l select=1:ncpus=36:mpiprocs=36 -l walltime=01:00:00 -q regular -A P86850054
./gen_cesm_maps.sh \
--fileocn /glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v3_211102.nc \
--nameocn tx0.1v3 \
--fileatm /glade/p/cesm/cseg/inputdata/share/scripgrids/0.9x1.25_SCRIP_desc.181018.nc \
--nameatm fv0.9x1.25
[ ... ]
Tue Jan 4 13:34:36 MST 2022
1: map_tx0.1v3_TO_fv0.9x1.25_aave.220104.nc
All 21 tests passed!
-----
2: map_tx0.1v3_TO_fv0.9x1.25_blin.220104.nc
All 14 tests passed!
-----
3: map_fv0.9x1.25_TO_tx0.1v3_aave.220104.nc
All 21 tests passed!
-----
4: map_fv0.9x1.25_TO_tx0.1v3_blin.220104.nc
All 14 tests passed!
-----
5: map_fv0.9x1.25_TO_tx0.1v3_patc.220104.nc
All 14 tests passed!
-----
So it appears the mapping files were created properly.
Resultant files
The script creates two sets of files in
/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files
Mapping ocean to atmosphere
Conservative, area-averaged:
map_tx0.1v3_TO_fv0.9x1.25_aave.220104.ncNon-conservative, bilinear:
map_tx0.1v3_TO_fv0.9x1.25_blin.220104.nc
Mapping atmosphere to ocean
Conservative, area-averaged:
map_fv0.9x1.25_TO_tx0.1v3_aave.220104.ncNon-conservative, bilinear:
map_fv0.9x1.25_TO_tx0.1v3_blin.220104.ncNon-conservative, patch:
map_fv0.9x1.25_TO_tx0.1v3_patc.220104.nc
Caution
Before the actual experiment begins, check to see if a new rtm->ocn
mapping file must be created. The
Adding grids
section of the CIME documentation says that the, “process for mapping from
the runoff grid to the ocean grid is currently undergoing many
changes…please contact Michael Levy for assistance.”
Generate domain files
Build the executable
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files
more INSTALL
# Read the installation instructions
cd src
../../../configure --macros-format Makefile --mpilib mpi-serial
(. ./.env_mach_specific.sh ; gmake)
ls -lart ../
[ ... ]
drwxr-xr-x 3 johnsonb ncar 4096 Jan 4 14:52 .
-rwxr-xr-x 1 johnsonb ncar 6086848 Jan 4 14:52 gen_domain
Pass the executable the correct files
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files
./gen_domain -m ../gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220104.nc -o tx0.1v3 -l fv0.9x1.25
[ ... ]
write domain.lnd.fv0.9x1.25_tx0.1v3.220104.nc
successfully created domain file domain.lnd.fv0.9x1.25_tx0.1v3.220104.nc
write domain.ocn.fv0.9x1.25_tx0.1v3.220104.nc
successfully created domain file domain.ocn.fv0.9x1.25_tx0.1v3.220104.nc
Edit config_grids.xml
Next edit config_grids.xml to add a model_grid node, a gridmap node and
possibly a domain entry for every new component grid.
Define the model grid
<!-- New f09_t13 grid for DART+POP2 ASD Project -->
<model_grid alias="f09_t13">
<grid name="atm">0.9x1.25</grid>
<grid name="lnd">0.9x1.25</grid>
<grid name="ocnice">tx0.1v3</grid>
<mask>tx0.1v3</mask>
</model_grid>
Add the domain files
<!-- Line 1128 -->
<domain name="0.9x1.25">
<nx>288</nx> <ny>192</ny>
<file grid="atm|lnd" mask="gx1v6">domain.lnd.fv0.9x1.25_gx1v6.090309.nc</file>
<file grid="ocnice" mask="gx1v6">domain.ocn.0.9x1.25_gx1v6_090403.nc</file>
<file grid="atm|lnd" mask="gx1v7">domain.lnd.fv0.9x1.25_gx1v7.151020.nc</file>
<file grid="ocnice" mask="gx1v7">domain.ocn.fv0.9x1.25_gx1v7.151020.nc</file>
<file grid="atm|lnd" mask="tn1v3">domain.lnd.fv0.9x1.25_tn1v3.160414.nc</file>
<file grid="ocnice" mask="tn1v3">domain.ocn.fv0.9x1.25_tn1v3.160414.nc</file>
<file grid="atm|lnd" mask="tn0.25v3">domain.lnd.fv0.9x1.25_tn0.25v3.160721.nc</file>
<file grid="ocnice" mask="tn0.25v3">domain.ocn.fv0.9x1.25_tn0.25v3.160721.nc</file>
<file grid="atm|lnd" mask="null">/glade/u/home/benedict/ys/datain/domain.aqua.fv0.9x1.25.nc</file>
<file grid="ocnice" mask="null">/glade/u/home/benedict/ys/datain/domain.aqua.fv0.9x1.25.nc</file>
<!-- New f09_t13 domains for DART+POP2 ASD Project -->
<file grid="atm|lnd" mask="tx0.1v3">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files/domain.lnd.fv0.9x1.25_tx0.1v3.220104.nc</file>
<file grid="ocnice" mask="tx0.1v3">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files/domain.ocn.fv0.9x1.25_tx0.1v3.220104.nc</file>
<desc>0.9x1.25 is FV 1-deg grid:</desc>
</domain>
Declare the grid maps
<!-- New f09_t13 gridmap for DART+POP2 ASD Project -->
<gridmap atm_grid="0.9x1.25" ocn_grid="tx0.1v3">
<map name="ATM2OCN_FMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_aave.220104.nc</map>
<map name="ATM2OCN_SMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_blin.220104.nc</map>
<map name="ATM2OCN_VMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_blin.220104.nc</map>
<map name="OCN2ATM_FMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220104.nc</map>
<map name="OCN2ATM_SMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220104.nc</map>
</gridmap>
Check the XML file
Check the formatting of the XML file to ensure it is formatted properly:
cd /glade/work/johnsonb/cesm2_1_3/cime/config/cesm
xmllint --noout --schema /glade/work/johnsonb/cesm2_1_3/cime/config/xml_schemas/config_grids_v2.xsd ./config_grids.xml
./config_grids.xml validates
Redo the process for f09_t12
Scrip grid files
f09
/glade/p/cesm/cseg/inputdata/share/scripgrids/0.9x1.25_SCRIP_desc.181018.nc
t12
/glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v2_211102.nc
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files
qsub -I -l select=1:ncpus=36:mpiprocs=36 -l walltime=01:00:00 -q regular -A P86850054
./gen_cesm_maps.sh \
--fileocn /glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v2_211102.nc \
--nameocn tx0.1v2 \
--fileatm /glade/p/cesm/cseg/inputdata/share/scripgrids/0.9x1.25_SCRIP_desc.181018.nc \
--nameatm fv0.9x1.25
[ ... ]
Wed Jan 12 15:33:52 MST 2022
1: map_tx0.1v2_TO_fv0.9x1.25_aave.220112.nc
All 21 tests passed!
-----
2: map_tx0.1v2_TO_fv0.9x1.25_blin.220112.nc
All 14 tests passed!
-----
3: map_fv0.9x1.25_TO_tx0.1v2_aave.220112.nc
All 21 tests passed!
-----
4: map_fv0.9x1.25_TO_tx0.1v2_blin.220112.nc
All 14 tests passed!
-----
5: map_fv0.9x1.25_TO_tx0.1v2_patc.220112.nc
All 14 tests passed!
-----
Domain files
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files
./gen_domain -m ../gen_mapping_files/map_tx0.1v2_TO_fv0.9x1.25_aave.220112.nc -o tx0.1v2 -l fv0.9x1.25
config_grids.xml
<!-- New f09_t12 grid for DART+POP2 ASD Project -->
<model_grid alias="f09_t12">
<grid name="atm">0.9x1.25</grid>
<grid name="lnd">0.9x1.25</grid>
<grid name="ocnice">tx0.1v2</grid>
<mask>tx0.1v2</mask>
</model_grid>
<!-- New f09_t12 domains for DART+POP2 ASD Project -->
<file grid="atm|lnd" mask="tx0.1v2">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files/domain.lnd.fv0.9x1.25_tx0.1v2.220112.nc</file>
<file grid="ocnice" mask="tx0.1v2">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files/domain.ocn.fv0.9x1.25_tx0.1v2.220112.nc</file>
<!-- New f09_t12 gridmap for DART+POP2 ASD Project -->
<gridmap atm_grid="0.9x1.25" ocn_grid="tx0.1v2">
<map name="ATM2OCN_FMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v2_aave.220112.nc</map>
<map name="ATM2OCN_SMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v2_blin.220112.nc</map>
<map name="ATM2OCN_VMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v2_blin.220112.nc</map>
<map name="OCN2ATM_FMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_tx0.1v2_TO_fv0.9x1.25_aave.220112.nc</map>
<map name="OCN2ATM_SMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_tx0.1v2_TO_fv0.9x1.25_aave.220112.nc</map>
</gridmap>
Redo the process for f09_t13
There are two SCRIP grid files for t13:
/glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v3_211102.nc
/glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v3_170728.nc
The tx0.1v3_211102.nc file was used in the initial attempt. The runs
resulting exhibited perplexing behavior suggesting that there was something
wrong with the file. This attempt rebuilds the mapping and domain files with
the tx0.1v3_170728.nc file.
Build ESMF_RegridWeightGenCheck
cd /glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/check_maps/src
module load esmf_libs/8.0.0
module load esmf-8.0.0-ncdfio-uni-O
gmake
ls -lart ../
drwxr-xr-x 3 johnsonb ncar 4096 Jan 13 16:11 .
-rwxr-xr-x 1 johnsonb ncar 1624728 Jan 13 16:11 ESMF_RegridWeightGenCheck
Mapping files
cd /glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_mapping_files/
qsub -I -l select=1:ncpus=36:mpiprocs=36 -l walltime=01:00:00 -q regular -A P86850054
./gen_cesm_maps.sh \
--fileocn /glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v3_170728.nc \
--nameocn tx0.1v3 \
--fileatm /glade/p/cesm/cseg/inputdata/share/scripgrids/0.9x1.25_SCRIP_desc.181018.nc \
--nameatm fv0.9x1.25
[ ... ]
Thu Jan 13 16:38:27 MST 2022
1: map_tx0.1v3_TO_fv0.9x1.25_aave.220113.nc
All 21 tests passed!
-----
2: map_tx0.1v3_TO_fv0.9x1.25_blin.220113.nc
All 14 tests passed!
-----
3: map_fv0.9x1.25_TO_tx0.1v3_aave.220113.nc
All 21 tests passed!
-----
4: map_fv0.9x1.25_TO_tx0.1v3_blin.220113.nc
All 14 tests passed!
-----
5: map_fv0.9x1.25_TO_tx0.1v3_patc.220113.nc
All 14 tests passed!
Domain files
cd /glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_domain_files
cd src
../../../configure --macros-format Makefile --mpilib mpi-serial
(. ./.env_mach_specific.sh ; gmake)
ls -lart ../
cd /glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_domain_files
./gen_domain -m ../gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220113.nc -o tx0.1v3 -l fv0.9x1.25
[ ... ]
successfully created domain file domain.lnd.fv0.9x1.25_tx0.1v3.220113.nc
write domain.ocn.fv0.9x1.25_tx0.1v3.220113.nc
successfully created domain file domain.ocn.fv0.9x1.25_tx0.1v3.220113.nc
config_grids.xml
<!-- New f09_t13 domains for DART+POP2 ASD Project -->
<domain name="0.9x1.25">
<nx>288</nx> <ny>192</ny>
[ ... ]
<file grid="atm|lnd" mask="tx0.1v3">/glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_domain_files/domain.lnd.fv0.9x1.25_tx0.1v3.220113.nc</file>
<file grid="ocnice" mask="tx0.1v3">/glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_domain_files/domain.ocn.fv0.9x1.25_tx0.1v3.220113.nc</file>
[ ... ]
<desc>0.9x1.25 is FV 1-deg grid:</desc>
</domain>
<!-- New f09_t13 gridmap for DART+POP2 ASD Project -->
<gridmap atm_grid="0.9x1.25" ocn_grid="tx0.1v3">
<map name="ATM2OCN_FMAPNAME">/glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_aave.220113.nc</map>
<map name="ATM2OCN_SMAPNAME">/glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_blin.220113.nc</map>
<map name="ATM2OCN_VMAPNAME">/glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_blin.220113.nc</map>
<map name="OCN2ATM_FMAPNAME">/glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220113.nc</map>
<map name="OCN2ATM_SMAPNAME">/glade/work/johnsonb/cesm2_1_1/cime/tools/mapping/gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220113.nc</map>
</gridmap>
Note
As described in List of attempts, this attempt worked.
Third attempt for f09_t13
The second attempt for f09_t13 works but after inspecting the header information for the f09_g16 and f09_g17 mapping and domain files, it seems that it would be prudent to use the exact same f09 Scrip grid file for f09_t13 as was used for the f09_g17 files.
Map files
Save the previous attempt
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files
mkdir previous_attempt
mv *tx0.1v3* previous_attempt
Make a second attempt
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/
qsub -I -l select=1:ncpus=36:mpiprocs=36 -l walltime=01:00:00 -q regular -A P86850054
./gen_cesm_maps.sh \
--fileocn /glade/p/cesm/cseg/inputdata/share/scripgrids/tx0.1v3_170728.nc \
--nameocn tx0.1v3 \
--fileatm /glade/p/cesm/cseg/inputdata/share/scripgrids/fv0.9x1.25_141008.nc \
--nameatm fv0.9x1.25
[ ... ]
Fri Jan 14 17:34:01 MST 2022
1: map_tx0.1v3_TO_fv0.9x1.25_aave.220114.nc
All 21 tests passed!
-----
2: map_tx0.1v3_TO_fv0.9x1.25_blin.220114.nc
All 14 tests passed!
-----
3: map_fv0.9x1.25_TO_tx0.1v3_aave.220114.nc
All 21 tests passed!
-----
4: map_fv0.9x1.25_TO_tx0.1v3_blin.220114.nc
All 14 tests passed!
-----
5: map_fv0.9x1.25_TO_tx0.1v3_patc.220114.nc
All 14 tests passed!
-----
Domain files
cd /glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files
./gen_domain -m ../gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220114.nc -o tx0.1v3 -l fv0.9x1.25
[ ... ]
ls -lart
-rw-r--r-- 1 johnsonb ncar 5531800 Jan 14 17:34 domain.lnd.fv0.9x1.25_tx0.1v3.220114.nc
-rw-r--r-- 1 johnsonb ncar 5531800 Jan 14 17:34 domain.ocn.fv0.9x1.25_tx0.1v3.220114.nc
config_grid.xml
<!-- New f09_t13 domains for DART+POP2 ASD Project -->
<domain name="0.9x1.25">
<nx>288</nx> <ny>192</ny>
[ ... ]
<file grid="atm|lnd" mask="tx0.1v3">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files/domain.lnd.fv0.9x1.25_tx0.1v3.220114.nc</file>
<file grid="ocnice" mask="tx0.1v3">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_domain_files/domain.ocn.fv0.9x1.25_tx0.1v3.220114.nc</file>
[ ... ]
<desc>0.9x1.25 is FV 1-deg grid:</desc>
</domain>
<!-- New f09_t13 gridmap for DART+POP2 ASD Project -->
<gridmap atm_grid="0.9x1.25" ocn_grid="tx0.1v3">
<map name="ATM2OCN_FMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_aave.220114.nc</map>
<map name="ATM2OCN_SMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_blin.220114.nc</map>
<map name="ATM2OCN_VMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_fv0.9x1.25_TO_tx0.1v3_blin.220114.nc</map>
<map name="OCN2ATM_FMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220114.nc</map>
<map name="OCN2ATM_SMAPNAME">/glade/work/johnsonb/cesm2_1_3/cime/tools/mapping/gen_mapping_files/map_tx0.1v3_TO_fv0.9x1.25_aave.220114.nc</map>
</gridmap>
cd /glade/work/johnsonb/cesm2_1_1/cime/config/cesm
xmllint --noout --schema /glade/work/johnsonb/cesm2_1_3/cime/config/xml_schemas/config_grids_v2.xsd ./config_grids.xml
./config_grids.xml validates