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Hi Gael, Martin,</div>
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Thank you for updating, I am happy to post my updates on PR related to this topic,</div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">I will try a new run with SEAICEpressReplFac = 0., soon, please let me know how I</span></div>
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</span></div>
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</span></div>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">Yohei</span></div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of Gael Forget <gforget@mit.edu><br>
<b>Sent:</b> 12 February 2024 16:24<br>
<b>To:</b> mitgcm-support@mitgcm.org <mitgcm-support@mitgcm.org><br>
<b>Subject:</b> Re: [MITgcm-support] ECCOv4 Configurations: R-Star Coordinate Error with Modified Wind Forcing</font>
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<div style="line-break:after-white-space">Hi Martin,
<div><br>
</div>
<div>What is your recommended data.seaice configuration for the ECCO4/LLC90 setup? </div>
<div><br>
</div>
<div>It would be great if we could update one of the fwd + adjoint llc90 configuration (the input.ecmwf + input_ad.ecmwf) </div>
<div>that we maintain and test daily in MITGcm to ensure that the ECCO4 configuration does not break</div>
<div>— updating to use the data.seaice that you recommend I mean. </div>
<div><br>
</div>
<div>Would you mind opening a PR to that effect on the repo below?</div>
<div><br>
</div>
<div><a href="https://github.com/MITgcm/verification_other/tree/master/global_oce_llc90">https://github.com/MITgcm/verification_other/tree/master/global_oce_llc90</a>
<div><br>
</div>
<div>Once that’s done, we will be able to continue the discussion over on github and eventually I should be able to post an </div>
<div>update to the production-ready ECCO4 setups that I maintain separately @ <a href="https://eccov4.readthedocs.io/en/latest/">https://eccov4.readthedocs.io/en/latest/</a> </div>
<div><br>
</div>
<div>Best,</div>
<div>Gaël</div>
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<div>On Feb 12, 2024, at 7:55 AM, Yohei Takano - BAS <yokano@bas.ac.uk> wrote:</div>
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Hi Martin,</div>
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Thank you for your advice, and yes, I am using the ECCOv4-r2 sea ice parameters (from Gael's</div>
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setup). It could be the sea ice (thinking of what I wrote in the previous e-mail) so I will try setting</div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">the SEAICEpressReplFac = 0., and rerun the model from the beginning.</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">Regarding the sea ice related diffusivities, are you talking about this part in the parameters?</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">'SEAICEdiffKhHeff = 400., SEAICEdiffKhArea = 400., SEAICEdiffKhSnow = 400.,'. Just to confirm so</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">should I also turn these off after turning on the<span class="x_Apple-converted-space"> </span></span><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">SEAICEpressReplFac
= 0.,</span><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">? (please let me know if </span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">I misunderstand something).</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">I am also curious about Gael's thoughts behind this setting.</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">Thank you again, I appreciate your input.</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">Regards,</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">Yohei</span></div>
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<span style="font-family:Calibri,sans-serif; font-size:11pt"><b>From:</b> MITgcm-support <<a href="mailto:mitgcm-support-bounces@mitgcm.org">mitgcm-support-bounces@mitgcm.org</a>> on behalf of Martin Losch <<a href="mailto:Martin.Losch@awi.de">Martin.Losch@awi.de</a>><br>
<b>Sent:</b> 12 February 2024 06:28<br>
<b>To:</b> MITgcm Support <<a href="mailto:mitgcm-support@mitgcm.org">mitgcm-support@mitgcm.org</a>><br>
<b>Subject:</b> Re: [MITgcm-support] ECCOv4 Configurations: R-Star Coordinate Error with Modified Wind Forcing</span>
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<div>You don't often get email from<span class="x_Apple-converted-space"> </span><a href="mailto:martin.losch@awi.de">martin.losch@awi.de</a>.<span class="x_Apple-converted-space"> </span><a href="https://aka.ms/LearnAboutSenderIdentification" data-auth="NotApplicable" id="OWAf5b8c241-5f7d-95b7-8c86-e96ca935cc8e" class="x_OWAAutoLink">Learn
why this is important</a></div>
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Hi Yohei,</div>
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if this is related to sea ice and if you are using the ECCOv4-r2 sea ice parameters (thi is what I found:<a href="https://github.com/gaelforget/ECCOv4/blob/master/input/data.seaice" id="OWA56b38f9e-88d9-0f6f-b2f4-6de905f9b7ef" class="x_OWAAutoLink" data-auth="NotApplicable">https://github.com/gaelforget/ECCOv4/blob/master/input/data.seaice</a>),
then you could try to set </div>
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SEAICEpressReplFac = 0.,</div>
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and rerun (from the beginning). I have also tried to get rid of landpoints where wind forcing “pushes” ice into corners where it cannot escape. The eccov4-r2 data.seaice contains large (400) diffusivities for seaice variables, which probably were used to alleviate
this problem (@Gael, correct me if I’m wrong). In my experience, this is no longer necessary with<span class="x_Apple-converted-space"> </span><span style="">SEAICEpressReplFac = 0.,</span></div>
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<span style="">Martin</span></div>
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<div>On 11. Feb 2024, at 18:00, Yohei Takano - BAS <yokano@bas.ac.uk> wrote:</div>
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Dear all,</div>
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I am working on setting up a simulation with the ECCOv4-r2 configuration. The first step is to</div>
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run (spin-up) the model with this configuration, except I detrended the atmospheric wind forcing</div>
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(including zonal, meridional wind stress and surface wind speed). The model ran for a while (~ 10 years)</div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">but stops after that with "STOP ABNORMAL END: S/R CALC_R_STAR", which is related to the r* coordinate</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">from my understanding. More specifically it is "too SMALL rStarFac[C,W,S]" and I see very small </span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">hFactorC (from diagnostics) at a grid point near the continent (or perhaps sea ice related since it is in the Southern Ocean).</span></div>
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<div style="text-align:left; text-indent:0px; font-family:Helvetica; font-size:12px">
<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt"> The reason behind the error is this modified atmospheric wind forcing but I am a bit stuck on how I can</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">fix this issue (i.e. how can I further modify the forcing to prevent this error) and would like to ask for advice on dealing with</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt">this issue. I saw comments in the previous question (in this list) lowering deltaT but I don't think that will solve the issue in this case. </span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:12pt"> <span class="x_Apple-converted-space"> </span></span><span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">rStarFac
error actually happens quite often in my case modifying the atmospheric forcing and for those</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">who have experienced similar challenge, I would like to ask for some advice how to deal with this.</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">Thank you in advance.</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">Regards,</span></div>
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<span style="font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif; font-size:16px; background-color:rgb(255,255,255)">Yohei</span></div>
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