Summary
Surface water temperatures were normal in the whole area and nutrient levels were also normal expect from silicate which was lower than normal in parts of the Baltic Proper and in the Kattegat. Oxygen levels in the deep water of the Arkona Basin and Hanö Bight were good. In the Bornholm Basin the oxygen levels had decreased to just above zero. In the rest of the Baltic Proper, oxygen concentrations below 2 ml/l were found at depths exceeding 60 to 75 metres. Hydrogen sulphide was found at the Landsort Deep (BY31) from 90 metres, from 60-100 metres in the Western Gotland Basin and already from 90 to 140 metres in the Eastern Gotland Basin. Phytoplankton activity was low in the region.