[MITgcm-support] Controlling C-grid grid mode

[Christopher L. Wolfe]

Thanks. That support thread was before my time and I hadn't run into it ...

On Aug 10, 2011, at 1:46 PM, Michael Schaferkotter wrote:

> here/s a MITgcm list link to a discussion which may be of some use:
> 
> http://forge.csail.mit.edu/pipermail/mitgcm-support/2003-December/001888.html
> 
> 
> biharmonic friction is discussed in the MITgcm manual at
> 
> http://mitgcm.org/public/r2_manual/latest/online_documents/node86.html
> 
> 
> 
> On Aug 10, 2011, at 1:28 PM, Christopher L. Wolfe wrote:
> 
>> Hi all,
>> 
>> I'm trying to figure out what the state of the art is in controlling the C-grid grid mode associated with the Coriolis term on coarse grids (~1 deg). Alistair came up with the CD scheme to control this grid mode, but it appears to have fallen out of favor since it dissipates an unknown amount of kinetic energy. I've heard people recommend biharmonic viscosity, but I'm not sure what an optimal value of the viscosity should be. There's a note in mom_calc_visc.F that recommends A4 = 0.125 Ah dx^2 … do the list members feel that this is a good value? What other schemes do people use to control this grid mode?
>> 
>> Thanks,
>> Christopher
>> 
>> 
>> -----------------------------------------------------------
>> Dr. Christopher L. Wolfe              	   858-534-4560
>> Climate, Atmospheric Science, and Physical Oceanography
>> Scripps Institution of Oceanography, UCSD  clwolfe at ucsd.edu
>> -----------------------------------------------------------
>> 
>> 
>> 
>> 
>> 
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