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

Patrick Heimbach heimbach at mit.edu
Mon Oct 2 20:59:22 EDT 2017

Hi Ivana,

Chris Piecuch wrote a nice detailed memo that applies to the NLFS (and ECCO v4).
It can be found at


> On Oct 2, 2017, at 7:54 PM, Cerovecki, Ivana <icerovecki at ucsd.edu> wrote:
> Hi guys,
> We are trying to close heat and salt budget for a run with nonlinear free surface. I was able
> to close budgets with linear free surface, using diagnostics as described in:
> http://wwwcvs.mitgcm.org/viewvc/MITgcm/MITgcm/doc/Heat_Salt_Budget_MITgcm.pdf?view=co&revision=1.1
> However, I am not able to close the budgets with nonlinear free surface. In old mitgcm-support emails I found
> Martha's comment:
>> The TOTTEND term only works with a linear free surface.  Otherwise, you
>> should output snapshots of ETAN and THETA and use these to calculate the
>> tendency term yourself.
>> Martha
> So, this is one difference. What else is different? Looking at Abhisek and Jean-Michel's document
> it is clear that with linear free surface one needs to use "Surf_corr_tend":
> Surf_corr_tend = (tsurfcor- WTHMASS(ix,iy)) / (DRF(1) * hFacC(ix,iy,1))
> What is the case with nonlinear free surface? Do I need such a correction with nonlinear free surface?
> I would very much appreciate your help,
> many thanks,
> Ivana
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> MITgcm-support at mitgcm.org
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