Of 17 open-sea sub-basins, good environmental status (GES) for DIN has been achieved only in the Gulf of Riga.
Though the winter-time DIN is still at elevated levels in the remaining 16 sub-basins, it has turned to decrease since the 1990's or the early 2000's.
The confidence of the presented DIN status estimate is high in all 17 open sub-basins.
Average DIN concentration in the surface (0 – 10 m) during winter (December – February) (Open dynamic map viewer in a new tab)
Eutrophication is caused by excessive inputs of nutrients (nitrogen and phosphorus) resulting from various human activities. High concentrations of nutrients and their ratios form the preconditions for huge algal blooms, reduced water clarity and increased oxygen consumption. Long term nutrient data are key parameters for quantifying the effects of human activities and evaluating the success of measures undertaken. This core indicator focuses on one important aspect of the complex phenomenon, but does not alone assess the eutrophication status.
BSAP segment and objective
A Baltic Sea unaffected by eutrophication
MSFD descriptor and criteria
5.1. Nutrient levels
Other relevant legislation
Water Framework Directive
Pyhälä M, Fleming-Lehtinen V, Laamanen M, Łysiak-Pastuszak E, Carstens M, Leppänen J-M, Leujak W, Nausch G, 2014. Nitrogen status - HELCOM Core Indicator Report. Online. [Date Viewed], http://helcom.fi/baltic-sea-trends/eutrophication/indicators/DIN