[MITgcm-support] passive constant homogeneous salinity blows up

[Jody Klymak]

Hi Madeline,

Turn salt time stepping to False?

Cheers,   Jody

> On 10 Jun 2016, at  8:39 AM, Madeline Miller <madelinemiller at fas.harvard.edu> wrote:
> 
> Hi support,
> I have been dealing with an interesting MITgcm issue in which the salinity value causes the model to blow up over a single timestep (100s, 50s, 20s, 10s...). It is interesting because the salinity is passive (linear EOS with sbeta=0), constant, and homogeneous, and is not forced by any external packages/fields.
> 
> The problem seems to come from gS accumulating rounding error over a long integration time. I also found a 13-year-old (!) email to the list from Martin about a similar issue: http://mitgcm.org/pipermail/mitgcm-support/2003-September/001697.html <http://mitgcm.org/pipermail/mitgcm-support/2003-September/001697.html>
> It has been so long that the code is significantly different, and gS is no longer reset in thermodynamics.F  
> 
> Can anyone suggest an appropriate place in the code to reset gS so that the drift doesn't run away with itself?
> 
> Best,
> 
> Madeline
> 
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support

--
Jody Klymak    
http://web.uvic.ca/~jklymak/





-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mitgcm.org/pipermail/mitgcm-support/attachments/20160610/a21a2080/attachment.htm>