Chlorophyll-a concentrations in transitional, coastal and marine waters

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Assessment made on 01 May 2004

Note: new version is available!

Mar 26, 2013 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Mar 2013
Jul 06, 2011 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Jul 2011
Jan 29, 2009 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Jan 2009
Nov 29, 2005 - Chlorophyll in transitional, coastal and marine waters (CSI 023) - Assessment published Nov 2005
Jul 27, 2004 - Classification of coastal waters

Generic metadata

Classification

Water (Primary theme)

Coasts and seas

DPSIR: State

Identification

Indicator codes

WEU 013

Geographical coverage:

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Contents

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.

Figures

$Trends in mean summer chlorophyll-a concentrations in Europe\'s Seas$ Trends in mean summer chlorophyll-a concentrations in Europe\'s Seas Number of stations in brackets

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.