[MITgcm-support] advection of ice-melange

[Martin Losch]

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
> > 
> > _______________________________________________
> > MITgcm-support mailing list
> > MITgcm-support at mitgcm.org
> > http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
> 
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
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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
> 
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support

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