Baltic Sea ‘dead zone’ development since 1969: IOW proviedes detailed map material based on long-term data

Oxygen minimum zones caused by intense microbial degradation processes of organic matter are characteristic for the Baltic Sea. The hostile living conditions of these so-called ‘dead zones’ become even more pronounced, when toxic hydrogen sulphide is produced by bacterial activity. To visualise the spatial and temporal distribution and dynamics of these areas, the IOW regularly publishes new maps in a unique collection of several hundered, thereby covering data of more than five decades.