[MITgcm-support] Open boundary conditions

[Martin Losch]

Xiangming,

there are plenty of posts about exactly this problem in the mailing list already (for a start I suggest a search in the mitgcm.org search engine or directly type “obcs balance site:forge.csail.mit.edu/pipermail” in google). The bottom line is that, if you don’t want to use OBCSbalance, then you need to make sure yourself that the net inflow into the model domain is exacltly zero over your simulation period. Any offset, an be it only very small, will accumulate very quickly and lead inevitably to net sea level rise (or drop).

Martin

On Oct 22, 2014, at 7:23 PM, Dustin Carroll <dcarroll at uoregon.edu> wrote:

> Hi Xiangming,
> 
> Can you provide more information — what exactly are you prescribing on your OB (i.e., what is the net transport)?  
>  
> Dustin
> 
> On Oct 22, 2014, at 12:26 PM, Xiangming Zeng <xzeng2 at ncsu.edu> wrote:
> 
>> Hi all,
>> 
>> I got a problem about a regional model with one open boundary. When the prescribed OBC is used, the SSH continues to drop unless the OBCbalance is set to be true. I guess there's some problem with the outflow, but I checked the OB files, they all seem fine. 
>> 
>> Is there any way to set the incoming flow as prescribed and outflow as Orlanski radiation?  So the SSH would not drop so much.
>> 
>> Does anyone have similar problem? Thanks. 
>> Xiangming 
>> _______________________________________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/listinfo/mitgcm-support
> 
> _______________________________________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/listinfo/mitgcm-support