Summary
Surface temperatures were above normal in the whole area. A cyanobacterial bloom was ongoing in the Baltic and large surface accumulations of cyanobacteria (blue green algae) were observed in the Arkona and Bornholm Basins and in patches in south-eastern part of the Baltic. Nutrient concentrations in the surface were normal for the season in the whole area. In the Arkona Basin and at BCSIII-10, bottom water oxygen conditions were good. Oxygen concentrations below 2 ml/l were found at depths exceeding 70 – 90 metres in the remainder of the Baltic. Hydrogen sulphide was found at the bottom in the Bornholm Deep, below 150 metres in the eastern and at depths exceeding 80-90 metres in the western Gotland Basins.