[MITgcm-support] Diagnostic "Um_Advec"

[David Ferreira]

Thanks Yu-Kun, Jean-Michel for the inputs. Clearly, I read too much in the name of “Um_Advec”.
I did a bit more digging and added some diagnostics for the KE component of the Bernoulli potential (the pressure component is in Um_dPhiX) and for the 3D Coriolis terms.

For the record I get this:
Um_Advec = Um_Cori + Um_AdvZ3 + Um_BerKE + Um_Cori3 + Um_AdvRe + Um_Metr

Some of these terms will be zero depending on options (e.g. Um_Metr = zero with deepAtmosphere=T).

Cheers,
David


From: MITgcm-support <mitgcm-support-bounces at mitgcm.org> on behalf of Jean-Michel Campin <jmc at mit.edu>
Date: Thursday, April 24, 2025 at 7:13 PM
To: mitgcm-support at mitgcm.org <mitgcm-support at mitgcm.org>
Subject: Re: [MITgcm-support] Diagnostic "Um_Advec"
Hi David,

I think Um_Advec/ Vm_Advec, always include the Coriolis term (even if using fluxform).
The first level decomposition should be:
 Total-U-tendency = Um_Advec + Um_Diss + Um_ImplD + Um_dPhiX + Um_Ext + AB_gU

And on second level, can try to split Um_Advec. This depend on the use of
flux-form or vector-inv. For the later, should be the sum of Coriolis, Bernouilli
term (no diagnostics), Um_AdvZ3 and Um_AdvRe (+ vertical/NH metric terms).
but I did not checked so I might have missed one.

Cheers,
Jean-Michel

On Thu, Apr 24, 2025 at 04:41:01PM +0000, David Ferreira wrote:
> Hi all,
>
> I?m trying to use the diagnostic Um_Advec/ Vm_Advec, and they don?t seem to give what I was expecting.
> (Um_dPhiX/Y, Um_Cori/ Vm_Cori, Um_hDis2/ Vm_hDis2 seem fine).
>
> A quick look at mom_vecinv.F where Um_Advec is filled suggests this is not going to work for all options (I think that with NHmetric, Um_Advec is filled with the Coriolis term). In fact, this diagnostic may only make sense with the mom flux form.
> So, I wonder if someone has any quick insight in this before I start banging my head against this.
>
> Cheers,
> David
>
>
>
>

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