cam_in, cam_out, dyn_in, dyn_out, phys_state, elem%state

[linlin]

Hi CESM experts,

I have a high-level question. Could you please introduce the function and difference of dyn_in, dyn_out, cam_in and cam_out structure? i understand that phys_state and elem%state these two communicate to each other through dynamics-physics coupling in routines d_p_coupling and p_d_coupling. But I am not quite sure how the dyn_in, dyn_out, cam_in, cam_out work/not work with the dynamics-physics coupling. What are the roles dyn_in, dyn_out, cam_in, cam_out?

Thanks a lot,
Lin

 

[peverley]

Hi Lin,

cam_in is the merged input state from merged surface to CAM (from the coupler)

• cam_in is an object of type "cam_in_t", which you can find in $CAM/src/control/camsrfexch.F90

cam_out is the output state from CAM to the surface (back to the coupler)

• As with cam_in, "cam_out_t" can be found in $CAM/src/control/camsrfexch.F90

dyn_in/dyn_out are objects that hold the inputs/outputs to dynamics

• dyn_in is of type dyn_import_t (which can be found in $CAM/src/dynamics/<dycore>/dyn_comp.F90
• dyn_out is of type dyn_export_t (which can be found in the same location).

If you want to see how all of these structures interact, I'd recommend starting in $CAM/src/control/cam_comp.F90 and tracing the code from there.

Hope that helps
Courtney