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<div class="elementToProof" style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Hi Martin,</div>
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<br>
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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>
<div class="elementToProof"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">the SEAICEpressReplFac = 0., and rerun the model from the beginning.</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);"><br>
</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);">Regarding the sea ice related diffusivities, are you talking about this part in the
parameters?</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);">'SEAICEdiffKhHeff = 400., SEAICEdiffKhArea = 400., SEAICEdiffKhSnow = 400.,'. Just to
confirm so</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);">should I also turn these off after turning on the
</span><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 16px; color: rgb(0, 0, 0); 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; color: rgb(0, 0, 0);">?
(please let me know if </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);">I misunderstand something).</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);"><br>
</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);">I am also curious about Gael's thoughts behind this setting.</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);"><br>
</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);">Thank you again, I appreciate your input.</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);"><br>
</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);">Regards,</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);"><br>
</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"><span style="font-family: Calibri, sans-serif; font-size: 11pt; color: rgb(0, 0, 0);"><b>From:</b> MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of Martin Losch <Martin.Losch@awi.de><br>
<b>Sent:</b> 12 February 2024 06:28<br>
<b>To:</b> MITgcm Support <mitgcm-support@mitgcm.org><br>
<b>Subject:</b> Re: [MITgcm-support] ECCOv4 Configurations: R-Star Coordinate Error with Modified Wind Forcing</span>
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<div>Hi Yohei,</div>
<div><br>
</div>
<div>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="OWAAutoLink" data-auth="NotApplicable">
https://github.com/gaelforget/ECCOv4/blob/master/input/data.seaice</a>), then you could try to set </div>
<div> SEAICEpressReplFac = 0.,</div>
<div>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 style="color: rgb(0, 0, 0);">SEAICEpressReplFac = 0.,</span></div>
<div><span style="color: rgb(0, 0, 0);"><br>
</span></div>
<div><span style="color: rgb(0, 0, 0);">Martin</span></div>
<div><br>
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<blockquote>
<div>On 11. Feb 2024, at 18:00, Yohei Takano - BAS <yokano@bas.ac.uk> wrote:</div>
<br>
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Dear all,</div>
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<br>
</div>
<div style="text-align: left; text-indent: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
I am working on setting up a simulation with the ECCOv4-r2 configuration. The first step is to</div>
<div style="text-align: left; text-indent: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">
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>
<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;">but stops after that with "STOP ABNORMAL END: S/R CALC_R_STAR", which is related to the r* coordinate</span></div>
<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;">from my understanding. More specifically it is "too SMALL rStarFac[C,W,S]" and I see very small </span></div>
<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;">hFactorC (from diagnostics) at a grid point near the continent (or perhaps sea ice related since it is in the Southern Ocean).</span></div>
<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;"><br>
</span></div>
<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>
<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;">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>
<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;">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;"><br>
</span></div>
<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;">
</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>
<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: 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>
<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: 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);"><br>
</span></div>
<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: 16px; background-color: rgb(255, 255, 255);">Regards,</span></div>
<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: 16px; background-color: rgb(255, 255, 255);"><br>
</span></div>
<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: 16px; background-color: rgb(255, 255, 255);">Yohei</span></div>
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