[MITgcm-support] SPEEDY out of range surface air temp

[David Ferreira]

Hi Alexandre,
It looks like you might have a case of "bad luck", i.e. an unusually big 
storm going through a corner of the cube. This happens occasionally and 
the model diverges although it can be stable for 1000s of years.

One way to deal with this is to change slightly a parameter and restart, 
a small enough change so that the solution does not change fundamentally 
but big enough to change the exact trajectory of the solution.
My favorite is the Shapiro filter timecale  Shap_Trtau, which I change 
from 5400. to 5300. (and back if the model blows up again few 1000s year 
later).

It's worth giving it a try before doing more tricky things,
david


On 5/18/15 1:36 PM, Alexandre Pohl wrote:
> Dear all,
>
> I am running a coupled configuration of the cubed-sphere MITgcm on a 
> deep-time continental configuration. One of my runs systematically 
> fails after ~ 1160 years. It seems that the atmospheric component - 
> SPEEDY - becomes locally unstable, resulting in very low surface air 
> temperatures. Here is the error message from STDERR.0010 :
>
> (PID.TID 0010.0001) *** ERROR *** SUFLUX_POST: TS= 9.9962618931693E+01 
> out of range  100 400
> (PID.TID 0010.0001) *** ERROR *** SUFLUX_POST: T_Lnd,Sea,Sic= 
> 2.731E+02 2.713E+02 9.996E+01 Mask: 0.00000 0.00000 1.00000
> (PID.TID 0010.0001) *** ERROR *** SUFLUX_POST: Pb in 
> i,j,bi,bj,myThid,IJ,X,Y=  14  17  1  1  1   270  -78.690  -82.584
>
> Please note that I am running 3 other simulations, using the same 
> boundary and initial conditions except the solar constant. Some of 
> these simulations are warmer, others are colder, and everything is 
> going well.
>
> Has anyone else experienced this before?
> Thanks,
> Alexandre
>
>
> __
>
> *Alexandre POHL*
> PhD Student
> Laboratoire des Sciences du Climat et de l’Environnement (LSCE)
> Centre d'Etude de Saclay
> CEA-Orme des Merisiers, bât. 701
> F-91191 GIF-SUR-YVETTE CEDEX
> alexandre.pohl at lsce.ipsl.fr <mailto:alexandre.pohl at lsce.ipsl.fr>
>
>
>
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