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 28 Mar 2023

1 min read

Topics: Water and marine environment Climate change adaptation

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).

https://www.eea.europa.eu/data-and-maps/figures/occurrence-of-reduced-oxygen-concentrations/fig01-129856-mar012-v8.eps/image_large

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Metadata

Units:: Oxygen in mg/l
Rights:: Copyrights of the datasets: please take a look at https://www.ices.dk/data/guidelines-and-policy/Pages/ICES-data-policy.aspx
and https://www.emodnet-chemistry.eu/data/acknowledgement
Copyrights of the figure: EEA standard re-use policy: unless otherwise indicated, re-use of content on the EEA website for commercial or non-commercial purposes is permitted free of charge, provided that the source is acknowledged (https://www.eea.europa.eu/legal/copyright). Copyright holder: European Environment Agency (EEA).
Owners:: European Environment Agency (EEA)
Processors:: Deltares
Figure type:: Map

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,