[MITgcm-support] pickup question

[Yilang Xu]

Hi Lambert, 

 

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. 

 

Best,

Yilang 

 

From: MITgcm-support <mitgcm-support-bounces at mitgcm.org> on behalf of 赤羽蓝 <lanchiyu12 at gmail.com>
Reply-To: <mitgcm-support at mitgcm.org>
Date: Thursday, April 22, 2021 at 10:01
To: <MITgcm-support at mitgcm.org>
Subject: [MITgcm-support] pickup question

 

Dear all,

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.

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.

Any ideas will be grateful.

Lambert

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