[MITgcm-support] rbcs advice

[Jody Klymak]

Hi Dimitris,


On Mar 4, 2014, at  7:51 AM, Menemenlis, Dimitris (3248) <Dimitris.Menemenlis at jpl.nasa.gov> wrote:

> Ah get it.  One last suggestion.  Probably also not useful for your problem, but just in case.
> 
> Chris, Gael, Ayan, and I have set-up and integrated a 1-48th global simulation that includes tidal forcing.
> We save hourly output of full 3D U/V/T/S/Eta, so these could be used as boundary conditions for
> "replaying" some small portions of domain.  You would not need sponge layer because the hourly
> obcs boundary conditions would naturally take care of most radiation issues.

Do you think its true that I could just force w/ obcs and do away w/ the sponge?  I've used sponges for so long I hadn't thought of giving this a try, but maybe it is all I need to do, and I can ditch rbcs.  Certainly my forcing should have all the modes that could conceivably reach the boundaries by the time my integration is done.  

Second, 1/48th degree global with tides!  That would be very interesting!

Thanks,   Jody

> 
> On Mar 4, 2014, at 6:38 AM, Jody Klymak <jklymak at uvic.ca> wrote:
> 
>> Sure, I've used obcs_sponge a lot as well. 
>> 
>> The problem for baroclinic flows is that the sponge is usually a good fraction of a mode-1 wavelength, so you really want incoming waves to be able to propagate through the sponge.  Using rbcs works pretty well for this, but comes at significant i/o expense.  
>> 
>> It would be nice if there was a version of obcs_sponge that read in the whole sponge, and didn't just use the boundary condition as the sponge forcing. 
>> 
>> Thanks,   Jody 
> 
> 
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--
Jody Klymak    
http://web.uvic.ca/~jklymak/