The Barents Sea model is based on the NERSC version 2.2.12 of HYCOM
(HYbrid Coordinate Ocean Model). The grid is a conformal mapping with the poles located
far from the domain so that the grid resolution is as uniform and isotroppic
as possible. The horizontal resolution is approximately 5 km partially
resolving the scale of baroclinic motion. Boundary conditions are obtained
from the 10-days TOPAZ4 forecast free runs initialized from met.no forecast with data assimilation.
The Barents Sea model is forced with ECMWF forecasts and the free runs
are launched every day at 21:30:00 CET and go from 00:00:00 GMT day+1 to
24:00:00 GMT day+3. Plotted variables are a daily average from midnight to midnight.
The sea ice model uses the EVP formulation and a rheology specific to
the marginal ice zone (MIZ). Because waves are not yet explicitly included in
the system, the boundary between the two dynamical regimes is set at
a concentration cutoff value (c=0.89). This is represented in the colorbar for
ice concentration. The green zone represents compact ice in the
viscous-plastic regime while the yellow-orange-red zone represents the
collisional regime. The ice edge, usually diagnosed by the 0.15 contour is in the
white zone while very low concentration ice is coloured in blue. This strategy
of setting the boundary between the two regimes is based on the fact that in
Barents Sea, areas of lower ice concentration are likely to be affected by ocean
waves which break the ice cover into multiple floes interacting with each other,
drastically affecting its dynamical nature.