[MITgcm-support] [EXTERNAL] Banding, Checkerboarding in KPP Viscosities

[Martin Losch]

OK, got it to run, but how long does it take until these patterns appear?

I am not at all certain that this matters: I assume that salinity is zero all the time, but I would suggest either setting a diffusive advection scheme for salinity (saltAdvScheme = 33) or turn salinity off (saltStepping = .FALSE.). With the default advection scheme (2) and the tiny diffusivities, there may be unexpected results.

Martin

> On 7. Apr 2020, at 19:18, Senja Walberg <senja.w at gmail.com> wrote:
> 
> Thanks Martin for moving this back to the support board. 
> 
> I haven't looked at all the fluxes and will output those next to see. I also haven't played with the time step, but I've changed the vertical grid spacing (dz). I'm using a 15 s timestep, when dz=1m I don't get any banding or artifacts. I've tried dz=0.5m and dz=0.25m and the banding is gridscale for both of those cases. 
> 
> My case is small enough to share, I've attached it in a zip file. Just run 'genbins.py' to get all the binary files and do the usual steps compiling to set up my configuration.
> 
> Cheers,
> Senja
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