The externalized surface facilities do not contain only the program to run the physical surface schemes, but also those producing the initial surface fields (before the run) and the diagnostics (during or after the run). All these facilities are listed, below, and they separate in 4 main parts:
PGD (routine pgd_surf_atm.f90): this program computes the physiographic data file (called PGD file below). At this step, you perform 3 main tasks: You choose the surface schemes you will use. You choose and define the grid for the surface The physiographic fields are defined on this grid. (...)
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