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Data Visualization

Trends in chlorophyll-a concentrations in European seas (1980-2019)

Data Visualization Created 18 May 2022 Published 28 Jul 2022 Last modified 04 Aug 2022
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The chart shows the percentage of locations with statistically significant: (1) decreasing trend (green), (2) no trend (grey) and (3) increasing trend (orange) by marine regions. The total number of locations in each subregion is shown in brackets.

More information

• Temporal trends were estimated in locations with data for at least 5 years in the period 1980-2019 and updated in the last 5-year period (2015-2019), using the non-parametric Mann-Kendall test. A p-value of <0.05 was considered to indicate a statistically significant trend.
• Results reflect data availability, which may vary significantly across regions and over time.

Geographical coverage
European marine regions - Baltic Sea, Greater North Sea, Bay of Biscay and Iberian Coast, Celtic Sea, Mediterranean Sea, Oceanic Northeast Atlantic and Macaronesia.

Temporal coverage
1980-2019 (the temporal range specified is the maximum range of dates for raw observations but this range varies upon the availability of observations at each location).

Methodology
Based on datasets produced for the CSI032_MAR006_Chlorophyll in transitional, coastal and marine waters_2021 Indicator, the percentage of the number of locations with significant decreasing trend (green), no trend (grey) and increasing trend (red) were calculated by marine region and plotted in a bar-type chart.

Data sources

Oceanographic database provided by International Council for the Exploration of the Sea (ICES)
Chemistry data - Data & products on marine water quality provided by European Marine Observation and Data Network (EMODnet)

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Geographic coverage

Temporal coverage

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