[MITgcm-support] About internal wave simulation

Martin Losch mlosch at awi-bremerhaven.de
Mon May 22 03:30:40 EDT 2006

Hi Lee,

with larger gradients in the initial conditions you generate stronger  
currents and that probably violate the CFL criterion (u deltaT/deltaX  
gets to large) . Use a smaller time step.

The monitor package captures an "explosion" by checking the  
temperature range if it is called before everything has turned to NaN  
(if you set monitorFreq < deltaT (or just 1.), then it's called at  
every time step, sometimes handy during debugging/figuring out what  
parameters to use).

tRef: with linear eos you have rho=rhoNil*(1-alphaT*(theta-tRef) +  


On May 19, 2006, at 1:03 PM, Yi HanSoo wrote:

> Hi, MITgcm users
> I am a newbie and following the internal wave example.
> I have two questions. When I change the initial condition of  
> potential temperature(theta)
> to larger gradient with stable stratification, I have overflow  
> errors with NaN values or error with a message below
> The example values show very small grdient of potential temperature.
> SOLUTION IS HEADING OUT OF BOUND : tMin , tMax -1.279E+29, 1.367E+29
> and does the reference potential temperature in PARAM0 mean the  
> perturbation of potential temperature(theta') in linear EOS?
> could anyone point me to some reference?
> Thanks in advance
> Lee
> ===================
> Lee HanSoo
> Ph.D student
> Research Center for Fluvial and Coastal Disasters,
> Disaster Prevention Research Institute,
> Kyoto University,
> Gokasho, Uji-si, Kyoto, Japan
> 611-0011
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