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5.3 Adding Prognostic Fields

Adding a new prognostic should not be too difficult. The prognostic can be either category dependent or not. Placing the new field in the module $ice\_state$ in a manner consistent with the existing prognostics will ensure its availability in existing modules. Careful consideration should be given to where the new prognostic will be updated in the time stepping in the driver file $ice.F$ . It might be wise to add the prognostic to the history file for output. It is necessary to add the new prognostic to the restart file if the exact restart character of the sea ice model is to be maintained (crucial for coupled model integrations). It might be wise to test the new prognostic in Active Ice Only (AIO) runs first, before attempting to run fully or partially coupled to other components.