[MITgcm-support] basic questions about periodicity in MITgcm domains

[Jeffery R Scott]

Hi all,

The manual describes MITgcm domains as doubly periodic in x,y unless walls exist at least one of the top-bottom left-right boundaries.

For Cartesian and spherical polar grids, this is straightforward. However, can someone confirm if using OBCS for a boundary 
effectively eliminates all periodicity for this boundary? (all variables, regardless of which variables used in obcs)

Unfortunately the manual is lacking much documentation about curvilinear grids (and, the doc on EXCH2 is incomplete).
I would think there is no periodicity assumed using a curvilinear grid (?)

Thanks,
Jeff