Summary
The lowest temterature of the surface water was 2.5C and the highest was 4.7C. Hydrogen sulphide was found only in the eastern Gotland Basin, from 125 and 130 meters in the Fårö and the Gotland Deep respectively. In the Skagerrak, the Kattegat, the Sound and in the southern Baltic (BY1 and the Bornholm Deep) the spring bloom was confirmed by the high fluorescence, the oversaturation of oxygen and the decrease of nutrients of the surface water.