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Over sea the TESSEL
contains only one or two tiles (open and frozen water). As
mentioned above, open water points have a fixed SST throughout the
forecast. The sea-ice fraction is based on satellite observations.
The temperature at the ice surface is variable and calculated
according to a simple energy balance/heat budget scheme. The
horizontal distribution of ice is kept constant during the
forecast. In case of sea ice the surface temperature is regulated
by a 4-layer ice model. The SST of the underlaying ocean is assumed
to be -1.7°C.
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