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    Based on DHI operational Hydrodynamic 3D Model DKBS2hd model run results, a point dataset describing for each year the probability of a certain seabed location in the Baltic Sea being located below the deep halocline was created. The spatial coverage was the Baltic Sea. The spatial resolution was 5km. The temporal coverage was 20 years (2001-2020). The 2 rasters made available here result from interpolation of the point dataset, and represent 20-year probability (respectively average and standard deviation) values. The development of the original point dataset was funded by the EMODnet lot ‘Seabed Habitats’ for use in the development of the EUSeaMap product, more specifically in modeling the spatial distribution of the biological zones ‘circalittoral’ and ‘offshore circalittoral’. According to the EUNIS habitat classification, in the Baltic Sea the circalittoral is above the halocline/pycnocline, while the offshore circalittoral is below.