<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Sure, I’ll open a PR later this week.<div><br></div><div>Martin<br id="lineBreakAtBeginningOfMessage"><div><br><blockquote type="cite"><div>On 13. Feb 2024, at 16:00, Gael Forget <gforget@mit.edu> wrote:</div><br class="Apple-interchange-newline"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi Martin,<div><br></div><div>Thanks for the quick response and links. Yes, if you have time I’d like to proceed with modifying global_oce_llc90/input.ecmwf/data.seaice to the one that you’d recommend. <a href="https://github.com/mjlosch/MITgcm/blob/idemix_test_runs/idemix_test/llc90/input/data.seaice">The one from your idemix_test</a> minus all of the commented stuff maybe? Should not require any change to SEAICE_OPTIONS.h as far as I can see, so this wont affect the other tests in verification/global_oce_llc90. Seems to me that it would be great to have your recommended data.seaice config for llc90 in the verif_other repo; to be able to point people to it, know it is regularly tested & maintained, etc. Later on (e.g. this spring) I could run a full suite of ECCO diagnostics using it, send you feedback over at the GitHub repo, and we can always iterate on improving things further if needed. What do you think?</div><div><br></div><div>Best,</div><div>Gaël</div><div><br></div><div><br></div><div><br></div><div><div><blockquote type="cite"><div>On Feb 13, 2024, at 1:29 AM, Martin Losch <Martin.Losch@awi.de> wrote:</div><br class="Apple-interchange-newline"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">Hi,<div><br></div><div>I do not run ECCO4-v2 exactly, but I run somethihng “Ecco-like” (i.e. llc90 with topography, initial conditions etc borrowed from ECCO4), where I modified a couple of parameter settings to my liking. I did not check the results as carefully as the ECCO4 solution is checked, and it is certainly not fit to observations, so that the solution will not have the degree of realism of any constrained ECCO solution. I have a branch for this with sample configuration here: <a href="https://github.com/mjlosch/MITgcm/tree/idemix_test_runs/idemix_test/llc90">https://github.com/mjlosch/MITgcm/tree/idemix_test_runs/idemix_test/llc90</a></div><div><br></div><div>This is meant for long integrations (I run this for >1200 years).</div><div><br></div><div>I have a different llc90 setup here: <a href="https://github.com/mjlosch/MITgcm/tree/myraslyboca/llc90">https://github.com/mjlosch/MITgcm/tree/myraslyboca/llc90</a> that I used for AD sensitivity simulations, but not optimisations. I am running this for order 20years. You’ll notice that it’s not so different from the other one. And then there’s another one here, also used for AD-simulations, but only in the Weddell Sea: <a href="https://github.com/mjlosch/MITgcm/tree/sochic/ws135x120">https://github.com/mjlosch/MITgcm/tree/sochic/ws135x120</a></div><div><br></div><div>In all of these I use SEAICEpresReplFac = 0. and no diffusion of sea ice.</div><div><br></div><div>Since I do not run any optimisations with this, I am not sure how well this will work. @Gael, do you still think that it is worth modifying, e.g. verification/global_oce_llc90/input.ecmwf/data.seaice according to this? The current setup is not broken, it just uses sea ice flags that are differetn from what I would use, if I were to start a run with sea ice. I am sure that there were good reasons for the parameter settings.</div><div><br></div><div>Martin</div><div><div><br><blockquote type="cite"><div>On 12. Feb 2024, at 17:24, Gael Forget <gforget@mit.edu> wrote:</div><br class="Apple-interchange-newline"><div><meta http-equiv="content-type" content="text/html; charset=utf-8"><div style="overflow-wrap: break-word; -webkit-nbsp-mode: space; 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><div><br></div><div><blockquote type="cite"><div>On Feb 12, 2024, at 7:55 AM, Yohei Takano - BAS <yokano@bas.ac.uk> wrote:</div><br class="Apple-interchange-newline"><div><meta charset="UTF-8"><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Hi Martin,</div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Thank you for your advice, and yes, I am using the ECCOv4-r2 sea ice parameters (from Gael's</div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">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" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><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><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><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><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><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><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><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="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><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">I misunderstand something).</span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><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><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><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><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Regards,</span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></span></div><div class="elementToProof" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Yohei</span></div><div id="appendonsend" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"></div><div class="elementToProof" style="font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><br></div><hr style="font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; display: inline-block; width: 1005.46875px;"><span style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; float: none; display: inline !important;"></span><div id="divRplyFwdMsg" dir="ltr" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><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><div> </div></div><table border="0" cellspacing="0" cellpadding="0" width="100%" align="left" style="caret-color: rgb(0, 0, 0); font-family: Helvetica; letter-spacing: normal; orphans: auto; text-transform: none; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none; border: 0px; display: table; width: 1026px; table-layout: fixed; float: none;"><tbody style="display: block;"><tr><td valign="middle" width="1px" bgcolor="#A6A6A6" cellpadding="7px 2px 7px 2px" style="padding: 7px 2px; background-color: rgb(166, 166, 166);"></td><td valign="middle" width="100%" bgcolor="#EAEAEA" cellpadding="7px 5px 7px 15px" style="width: 992px; background-color: rgb(234, 234, 234); padding: 7px 5px 7px 15px; font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif; font-size: 12px; font-weight: normal; color: rgb(33, 33, 33); text-align: left; overflow-wrap: break-word;"><div>You don't often get email from<span class="Apple-converted-space"> </span><a href="mailto:martin.losch@awi.de">martin.losch@awi.de</a>.<span class="Apple-converted-space"> </span><a href="https://aka.ms/LearnAboutSenderIdentification" data-auth="NotApplicable" id="OWAf5b8c241-5f7d-95b7-8c86-e96ca935cc8e" class="OWAAutoLink">Learn why this is important</a></div></td><td valign="middle" align="left" width="75px" bgcolor="#EAEAEA" cellpadding="7px 5px 7px 5px" style="width: 75px; background-color: rgb(234, 234, 234); padding: 7px 5px; font-family: wf_segoe-ui_normal, "Segoe UI", "Segoe WP", Tahoma, Arial, sans-serif; font-size: 12px; font-weight: normal; color: rgb(33, 33, 33); text-align: left; overflow-wrap: break-word;"></td></tr></tbody></table><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">Hi Yohei,</div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">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 style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"> SEAICEpressReplFac = 0.,</div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;">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="Apple-converted-space"> </span><span style="">SEAICEpressReplFac = 0.,</span></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style=""><br></span></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><span style="">Martin</span></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br></div><div style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><br></div><blockquote style="caret-color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: none;"><div>On 11. Feb 2024, at 18:00, Yohei Takano - BAS <yokano@bas.ac.uk> wrote:</div><br><div style="text-align: left; text-indent: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">Dear all,</div><div style="text-align: left; text-indent: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;"><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><div style="text-align: left; text-indent: 0px; font-family: Aptos, Aptos_EmbeddedFont, Aptos_MSFontService, Calibri, Helvetica, sans-serif; font-size: 12pt;">(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><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;"> <span class="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><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><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);">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><br><br><span style="font-family: Helvetica; font-size: 12px;">This email and any attachments are intended solely for the use of the named recipients. 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