Pinging @slevis-lmwg I put this as something to do as part of ctsm5.3.0, but we could do it in a post ctsm5.3.0 tag. It's easy to do, but involves enough steps that it could be done later.

I'll let others evaluate the timing here, but I worry about scope creep and further delays for making a CTSM5.3.0 and CESM_beta03 tags

Towards that end, I don't know this is show stopper for the scientific applications we need to meet for the 5.3 milestone or the "Aug" code chill, but we can discuss here or on Thurs.

I asked @jtruesdal offline and needs to have access to the files right away, but doesn't need it in a tag right away. So here's the plan

• We'll make the files with a branch tag when Derecho comes back up
• We'll add this work to b4b-dev and have it come in on the b4b-dev cycle...

Steps in ctsm5.3.0 with the mksurfdata_esmf tool for generating the 1850 file (similarly for 2000). Includes correction discussed below:

./gen_mksurfdata_build 
./gen_mksurfdata_namelist --start-year 1850 --end-year 1850 --res ne3np4 --model-mesh /glade/campaign/cesm/cesmdata/inputdata/share/meshes/ne3np4_ESMFmesh_c230714_cdf5.nc --model-mesh-nx 488 --model-mesh-ny 1
./gen_mksurfdata_jobscript_single --namelist-file surfdata_ne3np4_hist_1850_78pfts_c240925.namelist --number-of-nodes 1
qsub mksurfdata_jobscript_single.sh 

For Hist and SSP2-4.5:

./gen_mksurfdata_namelist --start-year 1850 --end-year 2100 --res ne3np4 --model-mesh /glade/campaign/cesm/cesmdata/inputdata/share/meshes/ne3np4_ESMFmesh_c230714_cdf5.nc --model-mesh-nx 488 --model-mesh-ny 1 --ssp-rcp SSP2-4.5
./gen_mksurfdata_jobscript_single --namelist-file surfdata_ne3np4_SSP2-4.5_1850_78pfts_c240925.namelist --number-of-nodes 1
qsub mksurfdata_jobscript_single_Hist.sh

Jobs in the queue on derecho. Let's see if they work on the first attempt...

You're welcome. Just to be clear though, I submitted these jobs, so you don't need to repeat the work :-)

@jtruesdal you will find the new files in
/glade/derecho/scratch/slevis/temp_work/new_rawdata/tools/mksurfdata_esmf

surfdata_ne3np4_hist_1850_78pfts_c240925.nc
surfdata_ne3np4_hist_2000_78pfts_c240925.nc

Feel free to test.

The landuse file (for transient simulations) is not ready. It ran out of wallclock with 1 node, so I gave it a second node and resubmitted.

John, the landuse file should be generated by this evening.

Started testing on derecho

• Addition to the Makefile

make crop-global-SSP2-4.5-ne3
make crop-global-1850-low-res
make crop-global-present-low-res
make global-present-low-res  (unnecessary)

• ./build-namelist_test.pl
• python testing
• clm_pymods

Opening the PR next and will post updates there.

@ekluzek let's discuss the last checkbox, due to my lack of familiarity with adding SCAM tests to our test-suites.

From meeting with @ekluzek
In testlist, change ptsRLA and ptsRLO tests to ne3np4.

@jtruesdal I wonder whether you have used the above ne3np4 fsurdat file(s) successfully. If so, could you point me to a case that worked that I could look at?

I've only tested these with CAM3d previously and they work but when I run them in SCAM it doesn't work. The format looks strange, they are using an older? lsmlon, lsmlat dimension for the variables where as everything up to this point always used gridcell for the unstructured grid formats.

Interesting. I suspect that this is a shortcoming of our mksurfdata_esmf tool. What do you think @ekluzek?

@ekluzek and I looked into this and eventually discovered user error on my part in a line that I listed above:
./gen_mksurfdata_namelist --start-year 1850 --end-year 1850 --res ne3np4 --model-mesh /glade/campaign/cesm/cesmdata/inputdata/share/meshes/ne3np4_ESMFmesh_c230714_cdf5.nc --model-mesh-nx 1 --model-mesh-ny 488
should have been
./gen_mksurfdata_namelist --start-year 1850 --end-year 1850 --res ne3np4 --model-mesh /glade/campaign/cesm/cesmdata/inputdata/share/meshes/ne3np4_ESMFmesh_c230714_cdf5.nc --model-mesh-nx 488 --model-mesh-ny 1

I will open an issue to alert users about this pitfall and to brainstorm how to remove the pitfall.