Summary
Surface water temperatures were normal for the season in all areas. In the Skagerrak, high nitrate concentrations were detected along the Jutland coast, where there also was a high algal production. In the rest of the Skagerrak and in the Kattegat, the spring bloom was almost over. In the Baltic all nutrients showed for the season normal values. The springbloom was ongoing in the eastern, northern and western Gotland Basins while it already had passed its peak in the Arkona and Bornholm Basins. Oxygen concentrations below 2 ml/l were found in the deep water below 70 to 80 meters in the whole Baltic Proper, while hydrogen sulphide was detected only in the eastern Gotland Basin, at depths greater than 150 meters.