Data Visualization

Trends in chlorophyll-a concentrations in Europe's seas (1980-2021)

Data Visualization Created 07 May 2024 Published 08 May 2024 Last modified 08 May 2024
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• Temporal trends were estimated with the non-parametric Mann-Kendall test. Only stations having data of at least 5 years and having at least data in the last 5-year period (2017-2021) were considered. A p-value <0.05 was used to consider a statistically significant trend.
• Results reflect data availability, which may vary significantly across regions and over time.

 Temporal coverage
1980-2021 (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).

Based on datasets produced for the CSI023_MAR006_Chlorophyll in transitional, coastal and marine waters in Europe_2023 Indicator, the number of locations with significant decreasing trends (green), increasing trends (orange) and no trends (grey) was counted for each marine region and all regions combined, and these values were 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)
Waterbase - Water Quality ICM, 2022 provided by European Environment Agency (EEA)

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Geographic coverage

Temporal coverage

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