Frequency of low bottom oxygen concentrations in coastal and marine waters

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Assessment made on 01 May 2004

Note: new version is available!

Mar 26, 2013 - Nutrients in transitional, coastal and marine waters (CSI 021) - Assessment published Mar 2013
Jul 05, 2011 - Nutrients in transitional, coastal and marine waters (CSI 021) - Assessment published Jul 2011
Nov 29, 2005 - Nutrients in transitional, coastal and marine waters (CSI 021) - Assessment published Nov 2005
Jul 27, 2004 - Nitrate in groundwater

Generic metadata

Classification

Water (Primary theme)

Coasts and seas

DPSIR: Impact

Identification

Indicator codes

WEU 015

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 the frequency of low oxygen concentrations (hypoxia) in the Baltic Sea, the North Sea and the Mediterranean Sea.

Figures

Trends in the frequency of low oxygen concentrations in bottom waters of the Baltic Sea, the Mediterranean and the North Sea. Number of stations in brackets

Key assessment

Generally no trend is observed in the frequency of hypoxia in the North Sea or the Mediterranean Sea during the period 1985-2002. Significant trends are observed at a few stations in the Baltic Sea although with no specific pattern. The most drastic change in the frequency of hypoxia in Danish waters occurred from the 1970s to the 1980s (Ærtebjerg et al. 2002). Many stations had too few data to provide sufficient power in the trend analysis.