[MITgcm-devel] depressed Eta and sIceLoad

[Patrick Heimbach]

Martin,

hold off a bit with updating.
We're changing diagnostics yet again
(issue over whether we want the 3 levels
in AREA, HEFF, etc. or not).

-p.



On Mon, 2006-10-23 at 11:05, Patrick Heimbach wrote:
> Hi Martin,
> 
> I implemented some initial diagnostics
> (i.e. using pkg/diagnostics)
> for the seaice package over the weekend.
> It does include HSNOW.
> 
> So you could have a look at it.
> As template for the use of diagnostics
> check out labsea/input/
> which has two seaice variables as part
> of the diagnostics list
> (you need to add 'SIhsnow ').
> 
> You need code updates in pkg/seaice, pkg/diagnostics
> and model/src.
> 
> Hope it works.
> 
> -p.
> 
> 
> 
> On Mon, 2006-10-23 at 10:50, Jean-Michel Campin wrote:
> > Hi Martin,
> > 
> > My first guess would be the snow-thickness (unfortunately, there was 
> > not many diagnostic for this field in pkg/seaice, may be Patrick
> > add one), since in the run I did, there was quiet a lot of snow.
> > Cheers,
> > Jean-Michel
> > 
> > 
> > On Mon, Oct 23, 2006 at 10:26:09AM +0200, Martin Losch wrote:
> > > Hi Jean-Michel,
> > > 
> > > unfortunately I cannot say when, but at sometime the sIceLoad fields  
> > > started to cause problems in the height field Eta. With useSeaice  
> > > = .true., useRealFreshWaterFlux=.true., exactConserv=.true., and  
> > > LINEAR free surface (#undef NONLIN_FRSURF) I get local depressions of  
> > > ETA underneath seaice  along the coast of -40m and more in 100years.  
> > > They go away, when I set useRealFreshWaterFlux = .false. I need to  
> > > mention, that I have a global EmPmR imbalance of approximately 10cm  
> > > per year, so that my mean Eta is approximately -11m after 100years,  
> > > but that wasn't a problem earlier. I attach a figure which shows Eta  
> > > and surface velocities averaged over the years 91 to 100 of a 100  
> > > year integration. What I find strange is that the strong depression  
> > > in Eta does not have any corresponding signal in the surface  
> > > velocities. T/S do not have any striking anomalies in these regions  
> > > around Antartica, either, that could compensate Eta-gradients of more  
> > > 10m per 100km. The model does not explode, the mean effective ice  
> > > thickness is way below 2m in the areas of Eta-depression.
> > > 
> > > Do you have any idea what's going on?
> > > 
> > > Martin
> > 
> > 
> > > _______________________________________________
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> > > MITgcm-devel at mitgcm.org
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> > 
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-- 
Dr Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
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