[MITgcm-support] changes related to pkg/shelfice (Jean-Michel Campin)

[Madeline Miller]

Hi Martin,

So, now the ice shelf can locally flex or bend a small amount?

Madeline

>
> Madeline,
>
> the cells at the ice-ocean interface are filled with ice above the ice
> interface and ocean/water below.
> I don't understand the second question, but I think the answer is "no". (o:
>
> Martin
>
> On Apr 27, 2012, at 8:16 PM, Madeline Miller wrote:
>
> > Hi Jean-Michel and Martin,
> >
> > Can you clarify what the other parts of the partial cell are filled with
> (air or ice)? Is this to account for the ice shelf losing contact with the
> water or to allow the ice shelf to have higher resolution bumps?
> >
> > Madeline
> >
> >
> > Today's Topics:
> >
> >   1. changes related to pkg/shelfice (Jean-Michel Campin)
> >
> >
> > ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Thu, 26 Apr 2012 12:05:21 -0400
> > From: Jean-Michel Campin <jmc at ocean.mit.edu>
> > To: mitgcm-support at mitgcm.org
> > Subject: [MITgcm-support] changes related to pkg/shelfice
> > Message-ID: <20120426160521.GA29910 at ocean.mit.edu>
> > Content-Type: text/plain; charset=us-ascii
> >
> > Hi pkg/shelfice users,
> >
> > The hydrostatic pressure calculation under ice-shelf has been changed
> today
> > ( model/src/set_parms.F, cvs version 1.14 :
> > > account for partial cells in surface level below ice-shelf for
> hydrostatic
> > > pressure calculation (set uniformFreeSurfLev to F if using shelfice
> pkg)
> > )
> > in order to account for partial-cell in the surface-level in contact
> > with the ice-shelf (just below the ice-shelf).
> >
> > pkg/shelfice allows to have partially filled grid-cell (a sea-water
> fraction
> > given by hFacC below an ice fraction (dry) above) below ice-shelf.
> > In the previous and original version, the hydrostatic pressure was
> calculated
> > assuming a 100% sea-water fraction in the surface grid cell below
> ice-shelf.
> > This is no longer the case and the partial-cell fraction is now taken
> > into account. This is more consistent with the remaining part of the
> model
> > which knows about partial cell filling.
> >
> > Making the transition to the new version:
> > You might need to update the input file SHELFICEloadAnomalyFile
> > (specified in data.shelfice) if the previous loading anomaly file was
> > accounting for only fully ice (dry) grid-cell, consistent with the
> > original pressure calculation.
> > See changes in MITgcm/verification/isomip/input/gendata.m, cvs version
> 1.2.
> > Note that the changes do not affect the way partial-cell are defined,
> > so that restarting with the new version but from a pickup file that was
> > produced with the original version should not be a problem.
> >
> > If for some reasons, after updating your code, you want to revert back
> > to the original version (to reproduce the old results), you will need
> > to edit the file "model/src/set_parms.F":
> >  66       uniformFreeSurfLev = usingZCoords
> >  67 C- Note: comment line below to revert to full-cell
> hydrostatic-pressure
> >  68 C        calculation in surface grid-cell below ice-shelf
> >  69       uniformFreeSurfLev = usingZCoords .AND. .NOT.useShelfIce
> >  70       IF ( selectNHfreeSurf.NE.0 .AND.
> > and comment out the line 69:
> >  69 c     uniformFreeSurfLev = usingZCoords .AND. .NOT.useShelfIce
> >
> > And if you have questions, you can contact the support list.
> >
> > Thanks,
> > Jean-Michel
> >
> >
> >
> >
> >
> > _______________________________________________
> > MITgcm-support mailing list
> > MITgcm-support at mitgcm.org
> > http://mitgcm.org/mailman/listinfo/mitgcm-support
>
> Martin Losch
> Martin.Losch at awi.de
>
>
>
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