[MITgcm-support] global 4deg verification

[chris hill]

Hi Samar,

  For a seasonal experiment you should change time steps to be the same.
  A 3600s timestep should be possible for the seasonal run. The 1200 sec 
is used to allow a longer async ratio, but for a synchronous run the 
stability limits are different so a one hour dt should work.

Chris
samar khatiwala wrote:
> Hello
> 
> I have a query about verification/global_ocean.90x40x15
> 
> As shipped, the momentum and tracer time steps in this experiment are set
> to different values in 'data':
> 
>  deltaTmom = 1200.0,
>  deltaTtracer= 43200.0,
>  deltaTClock = 43200.0,
> 
> Is this because the default is asynchronous time stepping for more rapid
> spin up? Once the model spins up to equilibrium, do I set deltaTtracer,
> deltaTClock, deltaTmom equal to each other? I have read (Danabasoglu et
> al) that in a seasonally forced model, the final spin uip must be done
> with synchronous time stepping. Can I set all these deltaT's to 43200.0
> sec without the model blowing up? Or does the CFL limit the time step to
> 1200.0 sec.
> 
> Thanks, Samar
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