Summary
The bottom water oxygen concentrations in Kattegat Proper were not alarming low. The oxygen concentration at W Landskrona was from 25 metres and deeper 2.25 ml/l, corresponding to 38 % saturation. In the Baltic oxygen concentrations below 2 ml/l were found at depths exceeding 60 to 80 metres. Hydrogen sulphide was found at BY15 (Gotland deep) below 225 metres, intermediate at BY20 (Fårö deep) between 80 and 100 metres, in the western Gotland Basin at depth exceeding 70 metres, and in the Bornholm Basin near the bottom at the station BY4. In the Skagerrak and in the north of Kattegat the silicate values were low and lower than normal, respectively. In the Baltic the phosphate and silicate concentrations were higher than normal.