[MITgcm-support] RE: C/D coupling parameters

[Chris Hill]

Wilbert,

 The tauCD parameter is the time scale on which the D grid supplementary
equations are pulled to the C grid primary equations. With
tauCD=deltatMom the D eqn's are pulled to the C terms in one timestep.
Typically the timescale that is appropriate when the CD scheme is needed
is around the interial period i.e. somewhere between 1 day and 3 days
for a global ocean simulation.

Chris

> -----Original Message-----
> From: Wilbert Weijer [mailto:wweijer at ucsd.edu] 
> Sent: Thursday, July 17, 2003 8:44 PM
> To: support at mitgcm.org
> Subject: C/D coupling parameters
> 
> 
> Dear MITgcm team,
> 
> in my runs I regularly encounter the checkerboard pattern as 
> described in Acroft et al., 1999, MWR. However, upon 
> activating the C/D code, with tauCD=deltaTmom, these features 
> do not disappear. Is there an argument how this parameter 
> (and hence rCD) should be chosen? This rCD does not represent 
> the 'Crank-Nicholson' alpha parameter, does it?  
> 
> Thanks!
> 
> Wilbert. 
> 
> 
> 
> 
> -- 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    Wilbert Weijer
>    Scripps Institution of Oceanography, PORD
>    University of California, San Diego
>    9500 Gilman Drive
>    La Jolla, CA 92093-0230
>    wweijer at ucsd.edu
>    phone: (858)-534-4274
>    fax:   (858)-534-9820
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>