<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:DengXian;
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:"Times New Roman \(Body CS\)";
panose-1:2 2 6 3 5 4 5 2 3 4;}
@font-face
{font-family:"\@DengXian";
panose-1:2 1 6 0 3 1 1 1 1 1;}
@font-face
{font-family:"Microsoft YaHei";
panose-1:2 11 5 3 2 2 4 2 2 4;}
@font-face
{font-family:"\@Microsoft YaHei";}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
span.EmailStyle18
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal><span style='font-size:12.0pt'>Hi Lambert, <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>I have encountered similar issues in the past. The model gives NaN due to violation of CFL condition. Then I restart from a pickup point, but the blow-up time can vary and sometimes last longer. However, if I rerun the model from the beginning, the blow-up time is the same. I guess depending on the machine you use there could be a difference in the model behavior, even if you start from the same pick-up files. Moreover, although the model could last a bit longer, perhaps rerunning it from a pickup point won’t help to stabilize it. Hope this helps. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Best,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'>Yilang </span><span style='font-size:10.0pt;font-family:"Times New Roman",serif;color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt'><o:p> </o:p></span></p><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:12.0pt;color:black'>From: </span></b><span style='font-size:12.0pt;color:black'>MITgcm-support <mitgcm-support-bounces@mitgcm.org> on behalf of </span><span lang=ZH-CN style='font-size:12.0pt;font-family:"Microsoft YaHei",sans-serif;color:black'>赤羽蓝</span><span style='font-size:12.0pt;color:black'> <lanchiyu12@gmail.com><br><b>Reply-To: </b><mitgcm-support@mitgcm.org><br><b>Date: </b>Thursday, April 22, 2021 at 10:01<br><b>To: </b><MITgcm-support@mitgcm.org><br><b>Subject: </b>[MITgcm-support] pickup question<o:p></o:p></span></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Dear all,<br><br>I am running a regional ocean circulation model. Something strange happened. I use the pickup to restart the model after it blows up. However, the restart is not exactly the same as the previous one. I use the last pickup before the blow-up time, then restarted model can run even longer than the previous blow-up time.<br><br>By the way, I use “pickupStrictlyMatch=.TRUE.” in the data file. I mainly use the KPP, the EXF (with surface SSS and SST relaxation), and OBCS packages.<br><br>Any ideas will be grateful.<br><br>Lambert<o:p></o:p></p></div><p class=MsoNormal>_______________________________________________ MITgcm-support mailing list MITgcm-support@mitgcm.org http://mailman.mitgcm.org/mailman/listinfo/mitgcm-support <o:p></o:p></p></div></body></html>