[MITgcm-support] tracer acceleration

[Alistair Adcroft]

Yes - it's that simple.

There's also a deltaTfreesurf which can be used to slow the barotropic mode.

If I recall correctly we like to do something like

 deltaTmom < deltaTfreesurf <= deltaTtracer

JMC can correct me.

A.
--
Dr Alistair Adcroft            http://www.mit.edu/~adcroft
MIT Climate Modeling Initiative        tel: (617) 253-5938
EAPS 54-1624,  77 Massachusetts Ave,  Cambridge,  MA,  USA

-----Original Message-----
From: mitgcm-support-bounces at mitgcm.org
[mailto:mitgcm-support-bounces at mitgcm.org] On Behalf Of samar khatiwala
Sent: Thursday, July 08, 2004 11:09 AM
To: mitgcm-support at mitgcm.org
Subject: RE: [MITgcm-support] tracer acceleration


Alistair, thanks.

To use asynchronous acceleration is it simply a matter of
using a deltaTtracer >> deltaTmom?

Samar

On Thu, 8 Jul 2004, Alistair Adcroft wrote:

> Samar,
>
> Only asynchronous acceleration has been implemented. If you want to
> implement the deep acceleration it requires making deltaT* a function 
> of depth or otherwise multiply deltaT* by a function of depth where it 
> is used. Deep acceleration is utterly non-conservative so implement at 
> your own risk!
>
> A.
> --
> Dr Alistair Adcroft            http://www.mit.edu/~adcroft
> MIT Climate Modeling Initiative        tel: (617) 253-5938
> EAPS 54-1624,  77 Massachusetts Ave,  Cambridge,  MA,  USA
>
> -----Original Message-----
> From: mitgcm-support-bounces at mitgcm.org
> [mailto:mitgcm-support-bounces at mitgcm.org] On Behalf Of samar 
> khatiwala
> Sent: Thursday, July 08, 2004 10:42 AM
> To: mitgcm-support at mitgcm.org
> Subject: [MITgcm-support] tracer acceleration
>
>
> Hello
>
> Can someone please tell me if the "distorted physics" technique of
> Bryan (i.e., use of unequal time steps in tracer and momentum, 
> especially in the deep ocean) has been implemented in the MIT model?
>
> If so, how do I go about using it?
>
> Thanks very much
>
> Samar
>
> Oceanography 201B
> Lamont Doherty Earth Observatory
> Columbia University
> Palisades, NY 10964
> voice (845)-365-8454
> Fax   (845)-365-8736
>
> Department of Applied Physics and Applied Mathematics
> Mudd 292C
> Columbia University
> voice (212)-854-8111
>
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