[MITgcm-support] Eta, ETAN and SIheff
Martin Losch
Martin.Losch at awi.de
Tue Sep 2 03:45:32 EDT 2008
Elja,
what do you mean by Eta and EtaN? From DYNVARS.h:
C etaN - free-surface r-anomaly (r unit) at current time level
so this is the name of the model variable for SSH. In the presence of
sea ice it is the surface underneath sea ice. For a particular
parameter configuration (#define ATMOSPHERIC_LOADING and
useRealFreshWaterFlux=.true.,) the free surface is actually depressed
by ice load (so that ice is not floating "on top" of the ocean but
really in the ocean).
what is "Eta" in your question?
You can try to initialize SIheff (effective ice thickness = volume/
grid-cell are) from a file, and with useSEAICE=.true. set
usePW79thermodynamics = .false.,
SEAICEadvHeff = .false.,
SEAICEadvArea = .false.,
SEAICEadvSnow = .FALSE.,
SEAICEadvSalt = .FALSE.,
SEAICEuseDYNAMICS = .false., ! only to turn off the computation of
unused drift velocities.
You'll still have some overhead from the ice model, but ice thickness
should not change.
Martin
On 1 Sep 2008, at 13:12, Elja Huibregtse wrote:
> Hi Matt,
>
> Thanks for your reply!
>
> Actually, my results for Eta and Etan differ significantly from
> each other. I modeled an ice layer on top of an ocean, and now I am
> wondering whether Eta gives the displacement on top of the ocean
> and Etan on top of the ice layer. Does this make sense?
>
> Regards,
> Elja
>
>
>
>
>
>
>
> -----Oorspronkelijk bericht-----
> Van: mitgcm-support-bounces at mitgcm.org namens Matthew Mazloff
> Verzonden: zo 8/31/2008 8:52
> Aan: mitgcm-support at mitgcm.org
> Onderwerp: Re: [MITgcm-support] Eta, ETAN and SIheff
>
> Hi Elja
>
> 1) I think eta = etan ....not sure where discrepancies (if any)
> come in
> SIheff is the effective ice thickness...the relationship would depend
> on surface boundary condition using...
>
> 2) sure you can fix SIheff, but i doubt there's a flag to do this.
> You'll have to hardcode a resetting of SIheff in the model...
>
> probably not to helpful...but thought id throw out a response
> -matt
>
> On Aug 29, 2008, at 11:35 AM, Elja Huibregtse wrote:
>
> > Dear all,
> >
> > I have two (trivial?) questions concerning modeling of ice:
> >
> > 1. What is the exact relation between Eta, ETAN and SIheff?
> > 2. Is it possible to fix the thickness of the ice, i.e. is it
> > possible to make the ice thickness independent of the ocean
> > temperature?
> >
> > Thank you very much in advance!
> >
> > Elja
> >
> >
> >
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>
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