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How to create a model_meshfile for a simulation with 0.23*0.31 deg resolution?

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KeerZ

Member
What version of the code are you using?
CTSM5.2.005

Have you made any changes to files in the source tree?
No

Describe every step you took leading up to the problem:
./create_newcase --case ~/CTSM5.2.005EAC_3/cime/scripts/JoyceCase/I2000BgcCrop.f02_g17.Spinup_Test01 --compset I2000Clm50BgcCrop --res f02_g17 --project UIUC0056 --run-unsupported

./case.setup

./xmlchange STOP_OPTION=ndays,STOP_N=1,RESUBMIT=0,JOB_WALLCLOCK_TIME=1:00:00

./xmlchange DATM_YR_ALIGN=2000,DATM_YR_START=2000,DATM_YR_END=2000

In the user_nl_clm, set the fsurdat as a 0.23*0.31 deg surface data, which is provided by my colleague.

After I submit the simulation, the job was aborted with an error message "model_meshfile UNSET does not exist".

Describe your problem or question:
The model_meshfile and model_maskfile are set automatically if it is a simulation with 1 deg resolution. However, for 0.23*0.31 resolution, both of them are UNSET.

I looked through the path: "/glade/campaign/cesm/cesmdata/inputdata/share/meshes/", and there are no mesh files for 0.23*0.31 resolution. I wonder where I can find such mesh files, or is there any tool or code that I can use to generate these mesh and mask files.

Thanks!
 
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
K

KeerZ

Member
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
There is also a mesh maker tool in tools/site_and_regional, although I haven't tried using it.
 
K

KeerZ

Member
Thanks for the replies! I have successfully run a test case in the 0.23*0.31 deg resolution.

A somewhat relevant question about the 0.23*0.31 deg simulation: I found that the ATM_NCPL is automatically set at 96 (so the time step is 15 min) for my 0.23*0.31 deg simulations, but it is usually 48 (so the time step is 30 min) for my 1 deg simulations. I wonder if this change is to avoid some temporary instabilities that might happen for the high-res simulations. If I'd like to save some computational hours, is there any risk in changing the ATM_NCPL back to 48 (e.g. the model might crash after 10 years of running)? Thanks a lot!
 
O

oleson

Keith Oleson
CSEG and Liaisons
Staff member
I would think it is ok to set that back to 30 minutes in a land-only simulation at that resolution. Generally, the time step is sometimes shortened in higher-resolution coupled simulations due to potential instabilities in the atmosphere. I'm not aware of any resolution dependent problems in a 1/4 land-only simulation at 30 minutes.
 
K

KeerZ

Member
oleson said:
I would think it is ok to set that back to 30 minutes in a land-only simulation at that resolution. Generally, the time step is sometimes shortened in higher-resolution coupled simulations due to potential instabilities in the atmosphere. I'm not aware of any resolution dependent problems in a 1/4 land-only simulation at 30 minutes.
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Thanks, Keith! I will give it a try.
 
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