Update EW mpas-a time steps and set radiation intervals #17
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Since hgrid names come from the ATM_GRID value, these names should have been mpasa7p5 and mpasa3p75. See the definitions in ccs_configs files "component_grids_nuopc.xml" and "modelgrid_aliases_nuopc.xml".
Other mpas_dt values are set to be 1/3 of atm coupling interval in seconds.
For 15km, 7.5km, and 3.75km resolutions (approaching cloud resolving scales) radiation schemes should update more frequently to keep up with the dynamics time steps. These settings update the radiation every 10 physics (CAM) time steps based on the atm coupling interval. Other mpasa resolutions will inherit the default "-1" value, which runs radiation once every simulated hour. NOTE: these are proposed values, and may not hold up to testing.
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Important context: EarthWorksOrg/EarthWorks#45 (comment)