[MITgcm-support] About global boundary condition

[Martin Losch]

Hi,
boundary conditions are cyclic/periodic by default, so that everything that leaves the domain on one end enters again at the opposite end.
The global examples with lat/lon grid in the verification directory make use of that. Just run one for a little longer and you'll immediately see that the east-west boundarie are by no means closed.

"Open boundary conditions" as I understand them "break" this periodicity in order to prescribe values at one end that DO NOT correspond to values at the opposite end of the domain. This type of BCs is also available in the obcs-package, but for a global model you do not (rather, should not/must not) need that.

Martin

On Jun 8, 2010, at 11:08 AM, zhangxf at mail.nmdis.gov.cn wrote:

> 
>  I am running a global model with a resolution of 0.25 degree using MITgcm,I want to know how I set my boundary 
> condition. 
> 
>  In addition,all global examples in the /MITgcm/verification/ let the east and west bound close and do not use the obcs package.The global simulation using MITgcm does not need open boundary condition ,does it? 
> 
> 
> Best regards! 
> 
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