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change the atm timestep to 288 steps per day (300 sec). This needs to be done via ATM_NCPL or else the land model will get confused about how frequently it is coupling with land
compile in debug mode. Will run 10x slower but will provide better error messages. And doesn’t run in any other mode on some machines.
change the default queue and wallclock from the standard queue with 1 hr walltime to debug queue and its max of 30 min walltime to get through the queue faster.
change the default length of the run from just a few steps to 1 day (or whatever you choose). This change is made in both env_run.xml and env_test.xml because case.submit seems to grab for one or the other file according to confusing rules - easier to just change both.
HIST_OPTION and HIST_N set the frequency of coupler snapshots (cpl.hi) files, which are useful for figuring out whether SCREAM is getting or giving bad data from/to the surface models
Step
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5: Change SCREAM settings
As of , this is done by modifying namelist_scream.xml either by hand or by using the atm-config-chg function which now comes bundled when you create a case. Explore namelist_scream.xml for variables you might want to change (but you shouldn’t have to change anything to run).
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You can check it’s progress via squeue -u <username> on many systems. Model output will be in the run subdirectory.
** Bonus Content: How to run at an unsupported resolution! **
Make the following ./xmlchange commands:
Change ATM_NCPL . Note that this is the number of atm timesteps per day so the model timestep (commonly known as dtime) is 86400 sec/ATM_NCPL.
In namelist_scream.xml, make the following changes:
Change Vertical__Coordinate__Filename to use the initial condition file for your new resolution
Change Filename under Initial__Conditions → Physics__GLL subsection to also use that new initial condition file
Change SPA__Remap__File to use one appropriate to map ne30 to your new resolution
Change se_ne as appropriate
change se_tstep and nu_top (recommended defaults for these and dtime are given in the awesome table on the EAM's HOMME Dycore Recommended Settings (THETA) page