Summary
Surface temperatures varied between 15.2 and 16.8 degrees C. Nutrient concentrations were normal for the season in almost all areas. High fluorescence values were measured at the Å section in the Skagerrak, as well as in the northern part of the Sound. Hydrogen sulphide was found at depths greater than 70-80 meters in the southern Baltic, 100 meters in the Karlsö Deep and at depths greater than 150 meters in the eastern Gotland Basin and in the northern and western Baltic.