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You are here: Home / Data and maps / Indicators / Chlorophyll-a concentrations in transitional, coastal and marine waters

Chlorophyll-a concentrations in transitional, coastal and marine waters

Topics: , ,

Assessment made on  01 May 2004

Generic metadata


Water Water (Primary theme)

Coasts and seas Coasts and seas

DPSIR: State


Indicator codes
  • WEU 013
Geographical coverage:

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Policy issue:  Is the condition regarding eutrophication of Europe's seas improving?

Key messages

  • Generally no trend is observed in summer surface chlorophyll-a concentrations in the Baltic Sea, Greater North Sea or Greek coastal waters.


Key assessment

No general trend is observed in summer surface chlorophyll-a concentrations either in the Baltic Sea area, Greater North Sea or coastal waters of Greece. The majority of stations show no trend. A few stations in Danish estuaries and Danish North Sea show a decreasing trend, whilst a few stations in Belgian, Finnish, Lithuanian and Swedish coastal waters show an increasing trend. No trend is observed in the Dutch coastal waters which receive high nutrient inputs from the Rhine river basin, nor in Norwegian and Greek coastal waters. Finland reports that the increasing trend of chlorophyll-a in the eastern Gulf of Finland and in the Archipelago Sea is due to increase in phosphorus released from hypoxic/anoxic sediments (Kauppila & Bäck, 2001; Hänninen et al. 2000). Due to the information available for this indicator the efforts in the reduction of nutrient loads didn't face success yet.

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