[MITgcm-support] doubt regarding OBCs

[Himansu Pradhan]

Hi MITgcm users,

i have a doubt regarding Open Boundary Conditions.
I have 3 experiments configured as :
In
*expA *

data.pkg
useOBCS = .FALSE.

here i get values at boundary.

*expB*

data.pkg
useOBCS = .TRUE.

data.obcs
# Open-boundaries
&OBCS_PARM01
OBCSfixTopo=.FALSE.,
OB_Jnorth=190*-1,
OB_Jsouth=190*1,
OB_Ieast=170*-1,
OB_Iwest=170*1,

useOrlanskiN/S/E/W=.FALSE.,

here i get "ZERO" values at boundary.

*expC*
data.pkg
useOBCS = .TRUE.

data.obcs
# Open-boundaries
&OBCS_PARM01
OBCSfixTopo=.FALSE.,
OB_Jnorth=190*-1,
OB_Jsouth=190*1,
OB_Ieast=170*-1,
OB_Iwest=170*1,

useOrlanskiN/S/E/W=.TRUE.,

here at the boundary, values are according to orlanski boundary conditions.
this is OK.

My query is (1), in expA, what is happening at the boundary ? where do i
get those values / what values are they ?????
*
*
*(2)* In expB , pls explain me what is happening here................... *
*

thanking all in advance,

himansu
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