[MITgcm-support] obcs/exf interactions

[Jinlun Zhang]

Tom,

If you are using ADI ice dynamics solver, you might see ice edge. But if you use LSR  solver, you should not see the ice edge, unless something is changed.

Jinlun

THOMAS HAINE wrote:

> Hi Folks,
>
> The line follows the ice edge in these experiments. So, I guess it's in pkg seaice (which I notice has changed a lot in the last year). I had to manually upgrade the solver (I think).
>
> Dan Lea fixed up the obcs exchanges to get our obcs running in parallel, but without referring to the latest release.
>
> Thanks for your help. We're getting some great DSOW simulations.
> Tom.
>
> ----- Original Message -----
> From: Patrick Heimbach <heimbach at MIT.EDU>
> Date: Wednesday, October 6, 2004 5:42 pm
> Subject: Re: [MITgcm-support] obcs/exf interactions
>
> > Hi Alistair
> >
> > several things:
> > the old ecco_... very likely had missing exchanges
> > in case you'd prescribe obcs.
> > As you may remember we dropped adding xz-/yz-exchanges
> > since there were becoming too many of them.
> > Instead, full fields should be exchanged once obcs are applied.
> > That's particularly true for the initialisation part of obcs.
> > These exchanges are not incorporated in any ecco-branch checkpoint.
> > They're in the latest version of the MAIN branch though.
> >
> > Another issue with the old version was incorrect mdsreadfield
> > for xz-/yz- fields so that you needed to pre-tile them.
> > That's fixed too in the latest.
> >
> > Nevertheless, the pattern still looks weird to me,
> > I think, obcs/exf related bugs tended to look different.
> > How about dropping your merged code and take a fresh
> > copy of the HEAD of the main branch?
> >
> > -Patrick
> >
> >
> >
> > On Wednesday 06 October 2004 16:20, chris hill wrote:
> >  > I haven't seen anything like this before, but I would guess
> > that it is
> >  > connected with OBCS. Would it be easy to do a simple perturbation
> >  > experiment starting from a stable stratification with no exf?
> >  >
> >  > Chris
> >  >
> >  > On Wed, 2004-10-06 at 14:27, Alistair Adcroft wrote:
> >  > > Resending msg:
> >  > >
> >  > > I've mostly sorted out this upgrade of Tom's experiment from
> >  > > ecco_c50_e29 to HEAD. The last problem has me puzzled - the
> > attached  > > figure is of (U,V) and the difference between the
> > two versions of the
> >  > > model after just two steps using the same forcing/parameters.
> >  > >
> >  > > The straight line is hard to see in the original fields and
> > I can't
> >  > > decide whether it comes from Tom's older code or is in the
> > new model.
> >  > > The line does not line up with tile boundaries (black grid
> > in last
> >  > > panel). The best I can determine is that the difference is
> > something to
> >  > > do with exf prescribing the OBC values. Various permutations
> > of code
> >  > > led me to this conclusion but I do not know which is right;
> > I can only
> >  > > see the line when I do a difference of outputs.
> >  > >
> >  > > Anyone else seen a problem like this?
> >  > >
> >  > > A.
> >  >
> >  > _______________________________________________
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> >  > MITgcm-support at mitgcm.org
> >  > http://dev.mitgcm.org/mailman/listinfo/mitgcm-support
> >
> > --
> > ----------------------------------------------------------
> > Patrick Heimbach     Massachusetts Institute of Technology
> > FON: +1/617/253-5259                    EAPS, Room 54-1518
> > FAX: +1/617/253-4464               77 Massachusetts Avenue
> > heimbach at mit.edu                 Cambridge MA 02139
> > http://www.mit.edu/~heimbach/                          USA
> >
> >
>
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--
Jinlun Zhang
Polar Science Center, Applied Physics Laboratory
University of Washington      Phone: (206)-543-5569
1013 NE 40th St               Fax:   (206)-616-3142
Seattle, WA 98105-6698        Email: zhang at apl.washington.edu
http://psc.apl.washington.edu/IDAO
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