Summary
Surface temperatures were normal or below normal throughout the area. No surface accumulations of cyanobacteria (blue green algae) were observed in the Baltic. Nutrient concentrations in the surface layer were normal for the season, except in the Arkona and Bornholm Basins where phosphate and silicate were elevated, and in the Fårö Deep and western Gotland Basin where silicate concentrations were high. In the Sound and the Arkona Basin, bottom water oxygen concentrations were ca. 3 ml/l. Oxygen concentrations in the Baltic Proper were below 2 ml/l everywhere at depths exceeding 60 – 80 metres. Hydrogen sulphide was found at the bottom in the Bornholm Deep, below 125 metres in the eastern and from 80 metres in the western Gotland Basin.