[MITgcm-support] Sponge BCs and passive tracers?

[Sonya Legg]

Thanks Ryan!

On 08/10/2015 02:21 PM, Ryan Abernathey wrote:
> Sonia,
>
> We do things like your case 2 all the time. The key is the RBCS package.
> http://mitgcm.org/public/r2_manual/latest/online_documents/node237.html
>
> RBCS is a general framework for relaxing any model variables 
> (including state variables and also ptracers) to an prescribed target 
> concentration. The relaxation rates can also be functions of space. 
> This is a very powerful tool and, in fact, many sponge layer 
> configurations can be implemented using RBCS rather than OBCS.
>
> Here is an example of a data.rbcs file that shows how to relax ptracers.
> https://bitbucket.org/ryanaberanthey/channel_moc/src/a43f0ef00dab442b81a7e8e4af70db0103ad162b/GCM/input/data.rbcs?at=master
> The ptracers stuff is all in the &RBCS_PARM02 section and is commented 
> out, but it should be clear enough.
>
> Let me know if this works out for you.
>
> Best,
> Ryan
>
> On Mon, Aug 10, 2015 at 12:11 PM, Sonya Legg <sonya.legg at noaa.gov 
> <mailto:sonya.legg at noaa.gov>> wrote:
>
>     Dear mitgcmers,
>
>     I'm trying to see if it is possible for me to include passive
>     tracers with sponge boundary conditions. I'm setting up a regional
>     calculation which I have previously done two different ways:
>
>     1. open bcs with Orlanski on 3 sides, forced inflow on 1 side,
>     including a passive tracer in the inflow
>
>     2. open bcs with sponge on all 4 sides, no passive tracer
>
>     Now I would like to include a passive tracer in variant 2, but I
>     think maybe passive tracer can't be included in sponge boundaries
>     (at least I can't see any code that suggests it is...)
>
>     Let me know if I am wrong, and there is a way to do it...
>
>     Thanks!
>
>     Sonya
>
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