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The SCREAMv1 build requires a handful of python libraries. It also requires a ton of other dependencies, but CIME handles these automatically. Here’s what you need to do on each machine:

• NERSC (cori-knl, pm-cpu, pm-gpu): nothing to do - everything is available by default

• Summit: just module load python

• LLNL machines (quartz, syrah): Create a conda environment with the needed packages:

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1. If you want to construct your own grid (e.g. for RRM), see Running E3SM on New Atmosphere Grids

2. ./xmlchange 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. See the dycore settings link at the end of this section for guidance on choosing dtime.

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