[MITgcm-support] OBCS north/south and periodic east/west?

[S. Bachman]

Hi all,

I seem to be having trouble getting MITgcm to run with OBCS enabled on 
the northern and southern boundaries and just leaving the east and west 
periodic.  I've undefined ALLOW_OBCS_EAST and ALLOW_OBCS_WEST in 
OBCS_OPTIONS.h, and am reading in the N/S boundaries from file.  My 
domain is 240x25x60 divided into 10 tiles (24 points each) in the zonal 
direction.  My data.obcs looks like this:

# ***************
# Open boundaries
# ***************
  &OBCS_PARM01
  OB_Jnorth=   24*-1,
  OB_Jsouth=    24*1,

#
  useOrlanskiNorth=.FALSE.,
  useOBCSsponge=.FALSE.,
  useOBCSbalance=.FALSE.,
  useOBCSprescribe=.TRUE.,
#
  OBNuFile='UVEL_north.bin',
  OBNvFile='VVEL_north.bin',
  OBNtFile='THETA_north.bin',
  OBNsFile='SALT_north.bin',

  OBSuFile='UVEL_south.bin',
  OBSvFile='VVEL_south.bin',
  OBStFile='THETA_south.bin',
  OBSsFile='SALT_south.bin',

but I'm getting an error at startup

(PID.TID 0000.0001) *** ERROR *** S/R OBCS_CHECK: Inside Mask and OB 
locations disagree :
(PID.TID 0000.0001) *** ERROR ***  from insideMask (bi,bj=  1,  1) 
expects OBE=    1 @ j=    1
(PID.TID 0000.0001) *** ERROR ***  from insideMask (bi,bj=  1,  1) 
expects OBW=   24 @ j=    1
(PID.TID 0000.0001) *** ERROR ***  from insideMask (bi,bj=  1,  1) 
expects OBE=    1 @ j=   25
(PID.TID 0000.0001) *** ERROR ***  from insideMask (bi,bj=  1,  1) 
expects OBW=   24 @ j=   25
(PID.TID 0000.0001) *** ERROR *** OBCS_CHECK:     8 errors in OB 
location vs Mask
(PID.TID 0000.0001) *** ERROR *** S/R ALL_PROC_DIE: ending the run

This is really confusing because OBCS isn't even enabled on the E/W 
boundaries, so I'm not sure whether I should be adding something to my 
data.obcs or if something else is going on here.  I also noticed that it 
is calling for OBE and OBW at the corner points of the tile only, if 
that means anything.

Any help would be greatly appreciated, thanks!
Scott