<div dir="ltr">Thanks Martin,<br><div><br></div><div>I shall try those suggestions.</div><div><br></div><div>Regards</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Aug 9, 2021 at 12:17 PM Martin Losch <<a href="mailto:Martin.Losch@awi.de">Martin.Losch@awi.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hi Mainak,<br>
<br>
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:<br>
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<br>
2. just use free drift. To do so set<br>
SEAICEuseFREEDRIFT = .TRUE., (#define SEAICE_ALLOW_FREEDRIFT only compiles the corresponding code, but doesn’t turn it on).<br>
LSR_mixIniGuess = 0, (or comment out again)<br>
<br>
For your melange, a free drift solution is probably appropriate, but I would be particularly interested in what happens in the first option.<br>
<br>
Martin<br>
<br>
<br>
> On 9. Aug 2021, at 09:57, Mainak Mondal <<a href="mailto:mm10845@nyu.edu" target="_blank">mm10845@nyu.edu</a>> wrote:<br>
> <br>
> Hi Martin,<br>
> <br>
> 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 <br>
> #define SEAICE_ALLOW_FREEDRIFT<br>
> <br>
> In the data.seaice I used<br>
> # SEAICE parameters<br>
> &SEAICE_PARM01<br>
> SEAIcewriteState =.TRUE.,<br>
> # SEAICE_initialHEFF= 0.5,<br>
> SEAICE_EPS =1.E-8,<br>
> SEAICEuseDYNAMICS =.TRUE.,<br>
> HeffFile='Heff2.bin',<br>
> # AreaFile='Area1.bin',<br>
> SEAICEadvHeff=.TRUE.,<br>
> SEAICE_no_slip = .TRUE.,<br>
> &<br>
> <br>
> &SEAICE_PARM03<br>
> &<br>
> <br>
> Regards<br>
> <br>
> On Mon, Aug 9, 2021 at 11:37 AM Martin Losch <<a href="mailto:Martin.Losch@awi.de" target="_blank">Martin.Losch@awi.de</a>> wrote:<br>
> Hi Mainak,<br>
> <br>
> 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?<br>
> <br>
> Martin<br>
> <br>
> > On 8. Aug 2021, at 10:53, Mainak Mondal <<a href="mailto:mm10845@nyu.edu" target="_blank">mm10845@nyu.edu</a>> wrote:<br>
> > <br>
> > Hi,<br>
> > <br>
> > 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<br>
> > <br>
> > # SEAICE parameters<br>
> > &SEAICE_PARM01<br>
> > SEAIcewriteState =.TRUE.,<br>
> > SEAICE_EPS =1.E-8,<br>
> > SEAICEuseDYNAMICS =.TRUE.,<br>
> > HeffFile='Heff1.bin',<br>
> > SEAICEadvHeff=.TRUE.,<br>
> > &<br>
> > 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.<br>
> > 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.<br>
> > <br>
> > Regards,<br>
> > <br>
> > <br>
> > -- <br>
> > Mainak Mondal<br>
> > Post-Doctoral Associate<br>
> > A2 104-C<br>
> > Center for Global Sea Level Change<br>
> > New York University Abu Dhabi<br>
> > ph: +971 26285339<br>
> > <br>
> > _______________________________________________<br>
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> <br>
> <br>
> -- <br>
> Mainak Mondal<br>
> Post-Doctoral Associate<br>
> A2 104-C<br>
> Center for Global Sea Level Change<br>
> New York University Abu Dhabi<br>
> ph: +971 26285339<br>
> <br>
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</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><b>Mainak Mondal</b><div>Post-Doctoral Associate</div><div>A2 104-C</div><div>Center for Global Sea Level Change</div><div>New York University Abu Dhabi</div><div>ph: +971 26285339</div><div><br></div></div></div></div></div>