[Fwd: RE: [MITgcm-support] grid-scale noise in 1/4-deg model]
adcroft at MIT.EDU
Wed Dec 3 13:35:19 EST 2003
Yes, you need
in either CPP_OPTIONS.h or MOM_FLUXFORM_OPTIONS.h (if you use the former you
don't need it in GAD_OPTIONS.h). Better use CPP_OPTIONS.h so it's all in one
Then my guess is you can push up viscA4 to around 1.E12 which should solve
I think 2.E12 will be beyond the edge of stability and you might find 5.E11
to be sufficient but as I said before, find the upper limit before choosing.
We will write a Smagorinsky scheme so that these issues are more easily
sorted out. Useful for the cube too.
Dr Alistair Adcroft http://www.mit.edu/~adcroft
MIT Climate Modeling Initiative tel: (617) 253-5938
EAPS 54-1523, 77 Massachusetts Ave, Cambridge, MA, USA
From: mitgcm-support-bounces at mitgcm.org
[mailto:mitgcm-support-bounces at mitgcm.org] On Behalf Of Dimitris Menemenlis
Sent: Wednesday, December 03, 2003 1:18 PM
Subject: RE: [Fwd: RE: [MITgcm-support] grid-scale noise in 1/4-deg model]
>> The ones in GAD_OPTIONS.h only affect diffusivity. What about
>> CPP_OPTIONS.h or MOM_FLUXFORM_OPTIONS.h ?
Oops. We did not set these flags in CPP_OPTIONS.h and
Does this mean we should be able to crank up biharmonic diffusion if we set
these flags there?
>> Do you mean tests for the 1/4 degree?
Yes, are there things we can try to get rid of grid-scale noise in 1/4-deg
Dimitris Menemenlis <menemenlis at jpl.nasa.gov>
Jet Propulsion Lab, California Insitute of Technology
MS 300-323, 4800 Oak Grove Dr, Pasadena CA 91109-8099
tel: 818-354-1656; fax: 818-393-6720
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