Summary
Surface water temperatures were normal in the whole area. Silicate concentrations were raised in the Skagerrak and Kattegat. In the Sound, high phosphate and silicate concentrations were recorded in the out-flowing water from the Baltic. In Arkona and Bornholm basins both phosphate- and silicate concentrations in surface water were still high. Oxygen concentrations below 2 ml/l were observed in bottom water in the Arkona Basin and at depths exceeding 70 to 90 metres in other parts of the Baltic Proper. Hydrogen sulphide was found at 80 metres in the Bornholm Basin, from 100 metres in the eastern Gotland Basin and from 90-100 metres in the western Gotland Basin.