Work in progress!!!

Global physics fields

As you hopefully already know, GEM can run in parallel, using MPI and/or OpenMP. In the physics, when using MPI the model domain gets horizontally divided into tiles, or rather cubes. Each MPI process is taking care of one of these cubes.

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Physics fields that are used in different routines and also available for output are organized in so called "busses". These busses are veeeeery long 2-D arrays. filled with one field after the other.

If variable is in the rest of the physics
    base/phyvar.hf : variable declaration in physics bus
    surface/sfcbus_mod.F90 : copy variable from physics bus to surface bus
        SFCVAR(name_in_surface_bus, 'name_in_physics_bus')

Explain what a bus is: slab with just land points etc.

in class_main:
    declare variable as pointer with the correct dimension (1-D)
        all usually 2-D fields are 1-D because we only get one row
        all usually 3-D fields are 2-D because we only get one slab