Summary
The temperature of the surface water remained above normal, but not as pronounced as during the November expedition. Surface nutrients showed, for the season almost normal values, except silicate in the Baltic Proper.
In the Bornholm Basin and Hanö Bight acute hypoxia (<2 ml / l) occurred from depths exceeding 70 meters. In the Eastern Gotland Basin completely oxygen-free conditions were registered from depths exceeding 125 meters (at BY20 already from 90 m) and acute hypoxia from 70 -80 meters. In western Gotland Basin, the oxygen situation is still serious as acute hypoxia already occurred from depths exceeding 70 meters and hydrogen sulphide from 80-90 meters depth.