[MITgcm-support] SOM problems

[Christopher L. Wolfe]

Hi modelers,

Does anyone have any experience using Pather's second order moments  
(advection scheme 81) with MITgcm?

I've been trying to use it starting with a well-equilibrated run  
using another advection scheme (using the U,V, Eta, and tracer fields  
as initial/hydrography fields since SOM requires different pickup  
information), but I'm getting really bizarre results. For one, I'm  
finding SOM to be *extremely* diffusive: The advection scheme is  
destroying tracer variance at twice the rate of diffusion (which is  
relatively large at 8e-5 m^2/s). As a result, the temperature field  
looks like one you would expect from a system with much larger  
explicit diffusion: the temperature fields are very smooth and the  
whole basin is becoming vertically unstratified.

Has anyone used this advection scheme and gotten good results? Is  
there anything I need to do with the configuration, other than set  
the advection scheme to 81?

Thanks,
Christopher

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Dr. Christopher L. Wolfe                   858-534-4560
Physical Oceanography Research Division    OAR 357
Scripps Institution of Oceanography, UCSD  clwolfe at ucsd.edu
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