[MITgcm-devel] seaice+thsice update

[Jean-Michel Campin]

Hi Jinlun,

May be I was not clear:
the typical (in fact, averaged over 100yr) saisonal variations of
the Arctic-average sea-ice thickness was between 2.m and 2.5m
and is now going between 3.m and 3.5m.
Do you mean 1.m of difference between summer and winter ?

Anyway, none of the forcing fields or parameters are fitted,
the sea-level is dropping (too much evap), not checked the albedo,
so, I don't worry too much about the realism here; just to
point out that these changes make a significant difference.

Thanks,
Jean-Michel

On Thu, Apr 05, 2007 at 09:13:45AM -0700, Jinlun Zhang wrote:
> Hi Jean-Michel,
> 
> Seasonal cycle of 2-2.5 m is already too much. Should be about 1 m.
> 
> Jinlun
> 
> Jean-Michel Campin wrote:
> 
> >Hi folks,
> >
> >I checked-in a new advection driver for thsice variable, 
> >pkg/thsice/thsice_advdiff.F 
> >and I started to evaluate how it works (in progress ...).
> >
> >I wanted to compare the results with Martin's version 
> >in pkg/seaice (seaice_advdiff.F), so I tried it: 
> >- run global_ocean.cs32 for more than 400yrs with exf &
> >CORE forcing, until the model stop because sea-level was 
> >uniformly too low (with realFreshWater, seaice-AdvSchem=1).
> >
> >- I also try with all the "C jmc: new version:" uncommented
> >in pkg/seaice/seaice_advdiff.F ; I was not expecting 
> >large differences, but in fact the mean sea-ice thickness
> >in the Arctic is much larger (mean seasonal cycle: 
> >from 3 to 3.5 m compared to 2 to 2.5 m before)
> >I checked the maximum ice fraction, goes up to ~ 110 % in the
> >previous version, and I think this is the reason why the 
> >ice was much thiner.
> >
> >I am now trying without realFreshWater to run it longer.
> >
> >I will check-in this modif ("C jmc: new version:" uncommented)
> >soon.
> >
> >Cheers,
> >Jean-Michel
> >_______________________________________________
> >MITgcm-devel mailing list
> >MITgcm-devel at mitgcm.org
> >http://mitgcm.org/mailman/listinfo/mitgcm-devel
> > 
> >
> 
> -- 
> 
> Jinlun Zhang
> Polar Science Center, Applied Physics Laboratory
> University of Washington, 1013 NE 40th St, Seattle, WA 98105-6698
> 
> Phone: (206)-543-5569;  Fax: (206)-616-3142
> zhang at apl.washington.edu
> http://psc.apl.washington.edu/pscweb2002/Staff/zhang/zhang.html
> 
> 
> 
> 
> 
>                         
> 
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