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Figure

Occurrence of reduced oxygen concentrations in coastal and marine waters surrounding Europe (average for the years 2009-2019)

Figure Created 04 Aug 2022 Published 05 Aug 2022 Last modified 25 Aug 2022
1 min read
Observations are aggregated at the level of 100*100 km grid cells, and show the mean 25-percentile of dissolved oxygen (DO) concentrations subdivided in four classes (<2 mg/l, 2-4 mg/l, 4-6 mg/l, >6 mg/l). The pie charts indicate the relative spatial coverage of areas with the four different concentrations of DO, aggregated by Marine Strategy Framework Directive (MSFD) marine regions - North-East Atlantic Ocean, Baltic Sea, Mediterranean Sea and Black Sea (smaller pie charts) and for all regions combined (large pie chart in centre).

European data

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Additional information

• The map shows the mean 25-percentile of dissolved oxygen (DO) concentrations in near-bottom waters during summer-autumn months over the period 2009-2019, by grid cell (EEA 100*100km grid).
• Results are shown by four classes of DO concentrations: three classes of reduced oxygen concentrations (<2mg/l; 2-4mg/l and 4-6mg/l) and oxygen concentrations > 6mg/l. Oxygen concentrations above 6mg/l are considered to support marine life with minimal problems while concentrations less than 2mg/l (hypoxia, oxygen deficiency) are considered to cause severe problems.
• Results reflect data availability, which may vary considerably across regions and over time. Lighter shaded cells indicate a sampling effort ≤5 sampling-campaigns. Blank cells indicate insufficient or no data availability.

Geographical coverage
Marine Strategy Framework Directive (MSFD) Marine regions: North-East Atlantic Ocean, Baltic Sea, Mediterranean Sea and Black Sea,

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Geographic coverage

Temporal coverage