[ecco-support] [EXTERNAL] Momentum Budget Terms

[Deborah Gardner]

Patrick, Bonus points indeed! Many thanks to you, Helen, and team.

Deb Gardner (she/her/ella)

On Tue, Jul 6, 2021 at 6:03 PM Helen R Pillar <helen.pillar at utexas.edu>
wrote:

> Hi Deb & Ian,
>
> Thanks Patrick for sharing our doc - I hope it is helpful. To summarize,
> we could close the momentum budget in ASTE with existing diagnostics and
> the addition of 2 new diagnostics to compute acceleration from (1) the
> surface PGF and (2) the implicit viscosity online (see eqs 20 & 21).
>
> I never got the surface PGF correct when I tried to compute it offline
> from ETAN, so we write a new diagnostic (our [U,V]m_dPsd[x,y]) from the
> momentum_correction_step S/R. Since ECCOv4 uses non-linear free surface
> with real freshwater flux and z* coordinates I think you will also need to
> compute the implicit viscosity online (our [U,V]m_Impl). If you use linear
> free surface you can compute it offline from VISrI_[U,V]m as described in
> the doc.
>
> So I think you will need both of these diagnostics to close the budget in
> ECCOv4, but others on this list may know better ; )
>
> Our code modifications and data.diagnostics can be pulled from TACC (See
> section 7).
>
> Please let me know if I can help or provide further clarification.
>
> Best wishes,
>
> Helen
>
>
> > On 6 Jul 2021, at 17:24, Patrick Heimbach <heimbach at mit.edu> wrote:
> >
> > Hi there,
> >
> > Helen Pillar (cc-ed) recently wrote a memo on how to close the momentum
> budget, please see
> >
> https://urldefense.proofpoint.com/v2/url?u=https-3A__hdl.handle.net_1721.1_130943&d=DwIFaQ&c=-35OiAkTchMrZOngvJPOeA&r=1_B57aTVdlsNSgGNR_o43boTaI8mNs8E6ZvaNZydUHY&m=K4_mMd_QJjcCmSOEjOIRDcK97pCg19w3KlkHUEhAI-o&s=dhgPw-9Kiior1SOmscY4mwU41mAmg0vMmy5YKgiVwYY&e=
> >
> > It has been tested for ASTE, but should be close to ECCOv4 (so perhaps
> 1/2 bonus point ;)
> >
> > Best,
> > Patrick
> >
> >
> >> On Jul 6, 2021, at 7:06 PM, Fenty, Ian G (US 329C) <
> ian.fenty at jpl.nasa.gov> wrote:
> >>
> >> Hi Deb,
> >> Good question.  The vorticity budget tutorial (made by Maike Julie,
> https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_maikejulie_&d=DwIFaQ&c=-35OiAkTchMrZOngvJPOeA&r=1_B57aTVdlsNSgGNR_o43boTaI8mNs8E6ZvaNZydUHY&m=K4_mMd_QJjcCmSOEjOIRDcK97pCg19w3KlkHUEhAI-o&s=1rz898R6FPJeBdnTd2-bgNzfsD0P1w9HXNgMvW9S7nE&e=
> ) uses a number of fields that we have not traditionally included as part
> of the official solution and so they are not on the ECCO drive.
> >>
> >> Looking at the vorticity budget tutorial I found the following set of
> variables:
> >>
> >>    PHI_SURF      ETAN          Vm_Advec      Vm_Cori
> >>    AB_gV         Vm_dPHdy      Vm_Ext        TOTVTEND
> >>    VISrI_Vm      VBotDrag      Vm_Diss       AB_gU
> >>    VISrI_Um      Um_dPHdx      Um_Ext        Um_Diss
> >>    TOTUTEND      UBotDrag      Um_Cori       Um_Advec
> >>
> >> Of these we only include Um_dPHdx, Vm_dPHdy, ETAN, and PHI_SURF (via
> PHI_HYD).
> >>
> >> We could re-run V4r4 to generate the fields needed to close the
> momentum budget and add those fields for our future releases.  Can you
> confirm exactly which fields are needed?  Matt Mazloff (cc’d) may be able
> to help.
> >>
> >> -Ian Fenty
> >>
> >>
> >> On 7/6/21, 4:10 PM, "ecco-support-bounces at mit.edu on behalf of Deborah
> Gardner" <ecco-support-bounces at mit.edu on behalf of dagardne at ucsd.edu>
> wrote:
> >>
> >> Hi all,
> >>
> >> I'm looking for the Um_[variable] terms and can't locate them in the
> ECCO drive. I'm looking to diagnose a closed momentum budget which I
> believe can only be accomplished with specific variables as opposed to
> computing with velocity variables. Does anyone know where I might be able
> to find the variables used in the Vorticity Budget Tutorial? Bonus points
> if it's Release 4
> >>
> >>
> >> Deb Gardner (she/her/ella)
> >> Best Waffle Topping, 2019 | Scripps Institution of Oceanography
> >> _______________________________________________
> >> ecco-support mailing list
> >> ecco-support at mit.edu
> >>
> https://urldefense.proofpoint.com/v2/url?u=http-3A__mailman.mit.edu_mailman_listinfo_ecco-2Dsupport&d=DwIFaQ&c=-35OiAkTchMrZOngvJPOeA&r=1_B57aTVdlsNSgGNR_o43boTaI8mNs8E6ZvaNZydUHY&m=K4_mMd_QJjcCmSOEjOIRDcK97pCg19w3KlkHUEhAI-o&s=fdjCC-gY6Vlxow1d-u5yqbfRAVBQnqCM_2dGNvHuvsY&e=
> >
>
>
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