[MITgcm-devel] depressed Eta and sIceLoad

[Jean-Michel Campin]

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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