Heat and salt budget notebook

[adele-morrison]

Would it be useful to have a notebook showing how to close heat and salt budgets? We don’t have 3D interior heat / salt budget terms for most simulations, but we could at least show how to close interior heat / salt content changes with surface fluxes. This information can potentially be figured out from the Surface Watermass Transformation notebook, but probably that’s not obvious to all?

[rmholmes]

Yes! I can do this. I've got lots of stuff lying around on various aspects of this which I've been meaning to document more precisely. I can cover:

• Closing globally-integrated budgets (i.e. what are the external sources, also see https://forum.access-hive.org.au/t/non-closure-of-heat-budget-in-access-cm2-esmf-cmip-output/244/2)
• Closing vertically-integrated budgets
• Closing full 3D budgets (including which terms are on in the different resolutions)
• How the budget diagnostics relate to changes in the properties themselves (e.g. snapshots versus averages, accumulation of rounding errors etc).

Much of my code is in Matlab, but this is a good opportunity to python-ify it.

[ChrisC28]

Is there any appetite to look at closing tracer budgets in MOM6 with the new vertical coordinates? While I'm aware of the GFDL example by Graeme McGilchrist, i think a ACCESS-OM3 version could be really useful.

[adele-morrison]

Yes that would be awesome. I'd imagine we'd need to rerun a MOM6 simulation and output extra diagnostics?

[ChrisC28]

I can try to get a year or two of the EAC config run by then with the appropriate diagnostics added, but Setonix is still down for maintenance. Could we ask @angus-g or @AndyHoggANU very nicely to run another year of the global 0.1 degree MOM6 with the additional diagnostics?

[rmholmes]

I've made a start on this from the MOM5/ACCESS-OM2 perspective in this notebook: https://github.com/rmholmes/cosima-recipes/blob/heat_budget/DocumentedExamples/Closing_Heat_Budgets_in_ACCESS-OM2.ipynb I will continue!