[Mitgcm-support] problems with periodic boundary conditions?

[mitgcm-support at dev.mitgcm.org]

Hi,

I have set up a zonally periodic channel, in which I want to create 
instabilities. I use the linear implicit free surface. In order to avoid 
boundary effects, I have tried a run in which I removed the northern and 
southern wall as well: double periodic domain. But now the mean sea 
surface (dynstat_eta_mean) fluctuates with an amplitude of 40m (5000m 
total water depth). Also the tracers are no longer conserved.
Has anyone seen this behavior before? What is going on?

Martin

-- 
Martin Losch
Alfred Wegener Institute for Polar and Marine Research
Postfach 120161, 27515 Bremerhaven, Germany;
Tel./Fax: ++49(0471)4831-1872/1797