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

Chlorophyll-a in transitional, coastal and marine waters

Topics: ,

Assessment made on  01 Aug 2003

Generic metadata

Classification

Coasts and seas Coasts and seas (Primary theme)

DPSIR: Driving force

Identification

Indicator codes
  • WEU 013
Geographical coverage:

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Contents
 

Policy issue:  Effects of nutrient load reductions on coastal concentrations of phytoplankton

Key messages

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

Figures

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 locations show no trend. A few locations in Danish estuaries and the Danish North Sea show a decreasing trend, whilst a few locations 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 and Bäck, 2001; Hänninen et al., 2000).

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