Summary
Surface water temperatures were higher than normal in the whole investigated area. Nutrients showed typical summer values, on the west-coast as well as in the Baltic Proper. Oxygen concentrations below 2 ml/l were observed at depths exceeding 70 meters in the Baltic. Hydrogen sulphide was found at 90 meters in the Bornholm Basin, deeper than 125 meters in the Eastern Gotland Basin and at depths greater than 80 meters in the Western Gotland Basin. Large surface accumulations of cyanobacteria (blue green algae) were observed in the southern part of Kattegatt and in the Sound. A less dense accumulation was found in a small area east of Fårö in the Baltic Proper.