[MITgcm-support] OBCS settings

[Matthew Mazloff]

Hi Jill

One thing to watch for is unphysical prescribed values.  For example,  
I have made open boundary conditions which resulted in zero salinity  
values being prescribed on some wet points.  If this occurs at depth  
you will get some substantial upwelling.  What kind of "weird edge  
effects" are you seeing?

-Matt


On Sep 10, 2006, at 9:09 PM, <jschwarz at awi-bremerhaven.de> wrote:

> Hi all,
>
> I'm getting some wierd edge effects in a model of the Ross Sea, and  
> as they only appear when i open the East and West boundaries i  
> presume i'm setting the boundaries wrong.  Could someone verify  
> that the following is correct:
>
> model domain:  nx=120; ny=81;   Southern edge is coastline;
> objective:  open entire eastern and western boundaries, keep the  
> northern boundary closed;
>
> in data.obcs:
> OB_Ieast = 81*-1,
> OB_Iwest=81*1,
> OB_Jnorth=120*0,
>
> (and OBCS switched on in packages.conf etc etc - the boundaries are  
> definitely being read in and are echoed into the mitgcmuv output file)
>
> I've tried some variations on this with rather spectacular  
> effects.. but they point to the above being what i want;  only the  
> text in OBCS.h doesn't seem to say the same thing.. i'm a bit  
> confused.
>
> Many thanks for any assistance!
> jill.
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