Summary
Surface water temperatures were normal in the whole area. Salinity in the surface water were normal in the main part of the area, except for the Eastern Gotland Basin were it was below normal. Surface nutrient concentrations in the whole investigated area were normal for the season. Oxygen concentrations below 2 ml/l were present at depths exceeding 60-80 metres. Hydrogen sulphide was found from 60 metres depth in the Western Gotland Basin, 20 metres more shallow than during the previous measurement. In the Northern Gotland Basin hydrogen sulphide was found deeper than 90 metres and in the Eastern Gotland Basin from100 metres depth. Plankton activity was low.