[MITgcm-support] OBCS Tracer Errors

[Martin Losch]

Hi Senja,

hard to say anything without seeing your configuration. I suggest that you have a look at verification/exp4, which uses both obcs and ptracers. Maybe that can help set up your configuration?

Otherwise we’d need to see at least the content of your code and input directories (without any large files).

Martin

> On 24. Jan 2019, at 16:01, Senja Walberg <senja.w at gmail.com> wrote:
> 
> Hello all, 
> 
> I'm new to MITgcm, and trying to model a river plume with tracers near the inflow (though I've tried far from the inflow as well) using OBCS and pTracers. My tracer concentrations are essentially exploding or ballooning out with time. I start with a small amount of tracer, and I've tried making the tracer easier for the simulation by applying smoothing, and inevitably I end up with tracer concentrations on the order of E38 or more, and oddly with negative tracer concentrations of about the same order. I've tried numerous solutions, changing the tracer diffusivity and ensuring the tracer was initially far from the inflow, as well as setting boundary conditions for the tracer using OBCS ptr files at the open boundaries, and none of this has worked. I'm wondering if there's some incompatibility between pTracers and OBCS, or if I need to enable another package like RBCS to reconcile all this. 
> 
> Regards and thanks for whatever help you can offer. 
> -Senja
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