[MITgcm-support] Sponge BCs and passive tracers?

[Ryan Abernathey]

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> 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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