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Jun She¹
Per Berg ¹, Peter N. Nielsen and Ole Karup Leth²

(1) Centre for Marine Forecasting, Danish Meteorological Institute, Copenhagen, Denmark
(2) Centre for Ocean and Ice, Danish Meteorological Institute, Copenhagen, Denmark

Main authors appear in bold

MERSEA Baltic Sea forecasting system (DMI-BSHCmod) is a two-way nested Baltic-North Sea model, which has two lateral open boundaries in North Sea. The open boundary conditions are essential in analysing and forecasting the internal water conditions. The model's open boundary condition includes 4 parts: temperature and salinity (T/S) profiles along the boundary, water level derived from tides, water level derived from a 2D surge model and water level derived from along-boundary gradient of the vertically integrated density. For the open boundary T/S, normally monthly climatological value is used. With MERSEA and/or NOOS cooperation, a dynamic boundary condition for the Baltic-North Sea model is now available either from a NW Shelf model running by Met.O. or a Nordic Sea model running by Met.no. This paper reports first several experiments by using large-scale model data as boundary conditions for MERSEA Baltic system. Significant impacts of the dynamic model boundary condition are found. Some technical problems are also identified from the experiments, e.g., bathymetry differences between the two coupled models and energy/flux conservation in the coupling; the quality requirements of the large-scale model data to be used as open boundary conditions and different ways of dynamic model coupling in operational forecasting etc.

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