Trends in oxygen concentrations in the near-bottom layer and number of trends, by concentration group (1989-2019)

Figure Created 04 Aug 2022 Published 05 Aug 2022 Last modified 05 Aug 2022
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The maps show trends in annual 25-percentile of oxygen concentrations in near-bottom waters at stations with at least 6 years of observations in the period 1989-2019, by three classes of DO concentrations: <4mg/l (including <2mg/l class); 4-6mg/l and >6mg/l. Only trends for time series ending after 2000 are included. The chart shows the number of time series with increasing, decreasing and no trend in the North-East Atlantic Ocean and Baltic Sea for the three classes of DO concentrations during the same period (1989-2019).

European data


Additional information

• The number of trends in the Mediterranean Sea and Black Sea are not shown as the number of time series is too low.
• Results reflect data availability, which may vary considerably across regions and over time.

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


Geographic coverage

Temporal coverage

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