[Mitgcm-support] Re: problems with periodic boundary conditions?

[mitgcm-support at dev.mitgcm.org]

Hi Martin,

If you are using cartesian grid, then it means something is
strange, and would be usefull to know the detail of the parameters
and packages / options you are using.
If it's an other grid, could simply be that the N & S boundaries 
do not have the same area, or that metric terms tend to produce a
drift.

Jean-Michel