[MITgcm-support] what is obcs balance?

[David Hebert]

Hi everyone,

Thanks Jean-Michel for clarifying the #undef NONLIN_FRSURF flag.

I am now looking at obcs_calc.F and the portions related to 
ALLOW_OBCS_BALANCE. If I am not mistaken, if I use ALLOW_OBCS_BALANCE, 
the code computes the flux through one particular face as the sum of  
area * OB[EWNS][uv].  If the sum over the whole face is not zero, the 
code then subtracts the sum/area off that particular face, forcing the 
boundary flux to be zero. Is this true? If not, can someone perhaps 
provide a description of what is happening? I am not seeing this 
description in the manual.

Thank you,

David