[MITgcm-support] heat and salt budget with nonlinear free surface

[Ryan Abernathey]

Hi Folks,

We are trying to do the heat and salt budgets in ECCOv4. We are using
python and can't use GCM-faces.

Abishek wrote a great document describing how to do the budgets with linear
free surface:
http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf?view=co&revision=1.1

I have used this approach many times in past simulations.

ECCOv4 is my first experience with nonlinear free surface / r* coordinates.
We have read the two relevant papers:
http://www.sciencedirect.com/science/article/pii/S1463500308000553
http://www.sciencedirect.com/science/article/pii/S146350030300009X

But we still don't full understand how to implement the budget in
practice...how do the available diagnostics map to the different terms? For
example, is DFxE_SLT appropriately "mass weighted" to reflect the
time-varying HFAC? And what do we do about the surface flux? Do I just use
SFLUX naively and apply no surface correction terms? Or do we need to keep
track of volume changes?

I'm sure many of you have figured this out already. Thanks for your advice.

-Ryan
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