Which collection to use to generate transport and deposition fluxes between gridded elements ?

[EdgarSergues]

Your name

Edgar Sergues

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LIRIDE

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I am working on life cycle impact assessment. I want to generate simplified source-receptor matrix using GEOS-Chem 14. For that, I need to model transport and deposition exchanges between elements of the grid. I saw that the Budget collection could help me do that but it is unclear what transport variables are about (are they horizontal, vertical, both ?). I am therefore wondering if there is another collection that would give me the data I need or if some more information on the budget collection transport variables could be found somewhere ? Thanks !

[yantosca]

Thanks for writing @EdgarSergues. The Budget collection as implemented in GEOS-Chem is the difference in mass across each GEOS-Chem operation. Please see our ReadTheDocs page for this description of the Budget collection](https://geos-chem.readthedocs.io/en/latest/geos-chem-shared-docs/supplemental-guides/history-diag-guide.html#budget).

[EdgarSergues]

Thanks for your answer @yantosca , I read this documentation already but it is unclear what budget transport is really about (vertical, horizontal, both ...) and if it could be used to identify exchanges between elements.

At the moment I am trying to explore the fortran code to implement new diagnostics that would give me the transported mass between each grid element for each advected species. If there is any documentation to your knowledge that could help me it would be appreciated.

Thanks !

[yantosca]

@EdgarSergues: The budget diagnostic are columns (full column, trop column, PBL column) rather than 3D diagnostics.

You may want to look into archiving the following diagnostics:

AdvFluxZonal_?ADV?
AdvFluxMerid_?ADV?
AdvFluxVert_?ADV?

as these will be the mass fluxes advected in each direction.

The TPCORE code used in GEOS-Chem Classic is 3rd-party code. It's a bit sloppy and undocumented, so it may be a bit of a slog to go through it.

[EdgarSergues]

Yes @yantosca I just found these diagnostics yesterday and I think it will fit my need. Is there a specific way to activate those diagnostics or can I just add a field to any collection in the history.rc file ? Thanks !