Summary
Nutrient concentrations in Skagerrak and Kattegat were normal for the season. In the Sound silicate concentrations were enhanced. The other nutrients showed normal values. Inorganic nitrogen (DIN) had been consumed in the coastal waters of Skagerrak and in Kattegat and in all stations in the Baltic Proper. Phosphorus concentration remains elevated in the south Baltic Proper. Also silicate concentrations were elevated in the same area. High chlorophyll fluorescence was noted in coastal waters of Skagerrak, in Kattegat and in some Baltic Proper stations. Oxygen concentrations lower than 2 ml/l were found at depths greater than 80 metres in Baltic Proper. Hydrogen sulphide was was found in western Gotland basin from 90-100 metres and in eastern Gotland basin from 145 metres. A thin bottom layer with oxygenated water was found at Gotland deep (BY15).