Surface water temperatures were normal throughout the study area. Nutrient concentrations in the surface waters were mostly normal in all areas except for phosphate, which was higher than normal in the Arkona Basin. The deep water in the Arkona Basin was well oxygenated: 4.7-6.6 ml/l. In the remainder of the Baltic Proper oxygen concentrations below 2 ml/l were observed at depths exceeding 70 to 80 metres. Hydrogen sulphide was found west and east of Gotland, in the west at depths exceeding 100 metres and in the east from 125 metres. An algal bloom was observed in the deeper layers of the Kattegat and the Sound.