[MITgcm-support] Temperature Advection schemes

[Jean-Michel Campin]

Hi Sergio,

> Dear MITgcm support,
> 
> I was running MIT with the default multidimension 2nd centered advection
> scheme and it was giving me false extrema. I changed it to 3rd order
> direct space time with flux limiting by setting tempAdvScheme= 33,
> saltAdvScheme= 33, in the data file, but now the run goes unstable very
> rapidly. Is there anything else I should change to use this advection
> scheme?
> 
> Thanks,
> 
> Sergio Jaramillo

You need to use
 staggerTimeStep=.TRUE.,
in paramter file "data", 1rst namelist (PARM01).
because with DST scheme, a simple 2 time-levels forward time stepping 
is used (instead of Adams-Bashforth), and the treatment of internal wave
become unstable unless momentum and active tracers (T,S) are
staggered in time.
It it the case ? If not, I suggest you to try it.

Jean-Michel