[MITgcm-support] advection of ice-melange

[Martin Losch]

PS. I found it: https://github.com/MITgcm/MITgcm/issues/327
http://mailman.mitgcm.org/pipermail/mitgcm-support/2020-January/012328.html

> On 9. Aug 2021, at 10:16, 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
>>> 
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> 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
>> 
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support
> 
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