[MITgcm-support] advection of ice-melange

[Mainak Mondal]

Thanks Martin,

I shall try those suggestions.

Regards

On Mon, Aug 9, 2021 at 12:17 PM Martin Losch <Martin.Losch at awi.de> wrote:

> Hi Mainak,
>
> I remember faintly, that in situations like this, the dynamics solver may
> have difficulties to get started (and there’s an MITgcm-support thread
> about this, but I could not find it, so I don’t if it got fixed). Please
> try this:
> 1. add LSR_mixIniGuess = 2, (or 4). This computes a free drift solution
> and initialises the LSR solver with this free drift solution and should get
> it going
> 2. just use free drift. To do so set
>  SEAICEuseFREEDRIFT = .TRUE., (#define SEAICE_ALLOW_FREEDRIFT only
> compiles the corresponding code, but doesn’t turn it on).
>  LSR_mixIniGuess = 0, (or comment out again)
>
> For your melange, a free drift solution is probably appropriate, but I
> would be particularly interested in what happens in the first option.
>
> Martin
>
>
> > On 9. Aug 2021, at 09:57, Mainak Mondal <mm10845 at nyu.edu> wrote:
> >
> > Hi Martin,
> >
> > There is a subglacial plume at the eastern boundary. It is coming up to
> the top and making a surface expression. There is the u component of
> velocity that should push the ice-melange. In the SEAICE_OPTIONS , I have
> already turned on the
> > #define SEAICE_ALLOW_FREEDRIFT
> >
> > In the data.seaice I used
> > # SEAICE parameters
> >  &SEAICE_PARM01
> >  SEAIcewriteState =.TRUE.,
> > # SEAICE_initialHEFF= 0.5,
> >  SEAICE_EPS =1.E-8,
> >  SEAICEuseDYNAMICS =.TRUE.,
> >  HeffFile='Heff2.bin',
> > # AreaFile='Area1.bin',
> >  SEAICEadvHeff=.TRUE.,
> > SEAICE_no_slip = .TRUE.,
> >  &
> >
> >  &SEAICE_PARM03
> >  &
> >
> > Regards
> >
> > On Mon, Aug 9, 2021 at 11:37 AM Martin Losch <Martin.Losch at awi.de>
> wrote:
> > Hi Mainak,
> >
> > You need some kind of forcing, either by wind or be water. Can you
> confirm that the water in the grid cells covered by your ice-melange (not
> clear how you define that in the sea ice model) is moving in some way?
> >
> > Martin
> >
> > > On 8. Aug 2021, at 10:53, Mainak Mondal <mm10845 at nyu.edu> wrote:
> > >
> > > Hi,
> > >
> > > Recently I was trying to advect ice-melange in MITgcm. I used sea-ice
> package and created an ice-melange over a 5 by 5 grid cell with an Heff=1m
> while the rest Heff=0. I used the following options in data.seaice
> > >
> > > # SEAICE parameters
> > >  &SEAICE_PARM01
> > >  SEAIcewriteState =.TRUE.,
> > >  SEAICE_EPS =1.E-8,
> > >  SEAICEuseDYNAMICS =.TRUE.,
> > >  HeffFile='Heff1.bin',
> > >  SEAICEadvHeff=.TRUE.,
> > >  &
> > > I am not putting any wind forcing but the melange is placed next to a
> subglacial plume, which was forced by the obcs package. The ice-melange is
> melting and sea-ice is growing around it.
> > > However, the ice-melange remains static at its location throughout.
> Any clue how I shall be able to advect it? I would really appreciate your
> help.
> > >
> > > Regards,
> > >
> > >
> > > --
> > > Mainak Mondal
> > > Post-Doctoral Associate
> > > A2 104-C
> > > Center for Global Sea Level Change
> > > New York University Abu Dhabi
> > > ph: +971 26285339
> > >
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> >
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> >
> >
> > --
> > Mainak Mondal
> > Post-Doctoral Associate
> > A2 104-C
> > Center for Global Sea Level Change
> > New York University Abu Dhabi
> > ph: +971 26285339
> >
> > _______________________________________________
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> > MITgcm-support at mitgcm.org
> > http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
>
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-- 
*Mainak Mondal*
Post-Doctoral Associate
A2 104-C
Center for Global Sea Level Change
New York University Abu Dhabi
ph: +971 26285339
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