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All fields of which the content is needed in the next timestep need to be in the permanent bus. For example, accumulators need to be in the permanent bus, since they usually get accumulated over several timesteps. The same goes for averages, minimum and maximum fields. But there are also instantaneous fields that need to be in the permanent like snow depth or temperature fields, because they are needed for the next timestep.
Fields from the permanent bus need to get declared as "VB=p0" resp. as "VB=p1" (mandatory to get read at timestep 0) - see above.
Surface bus
If variable is in the rest of the physics
base/phyvar.hf : variable declaration in physics bus
surface/This is a special bus which is only valid for the surface schemes which do not have access to any of the busses described above! However, fields from this bus still need to get declared in sfc_businit.F90 or phyvar.hf the in the volatile or permanent bus. To get them copied to the surface bus one needs to add them' in sfcbus_mod.F90 : copy variable from physics bus to surface bus
with:
| Volet |
|---|
SFCVAR(name_ |
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sfc, name_ |
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bus) |
Where:
'name_sfc' is the name the field will have in
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the surface bus and
'name_bus' is the "VN" name the one of the busses above.
Explain what a bus is: slab with just land points etc.
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