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Satellite imagery of chlorophyll-a concentrations in selected
Trend in summer chlorophyll-a concentrations in coastal and open waters of the Baltic, Celtic and Mediterranean Seas and NE Atlantic, 1985-2010
This figure shows stationwise trends in chlorophyll-a concentrations in coastal and open waters of the Baltic, North East Atlantic (Greater North Sea, Celtic Seas, Bay of Biscay), and Mediterranean Sea (Western Mediterranean Sea, Adriatic Sea) (% of stations showing statistically significant change, within the years 1985–2010). Numbers in parentheses indicates number of stations included in the analysis for each country. "Open sea" is the total of all off-shore stations (>20km) within a (sub)region.
Trends in summer chlorophyll concentrations in European Seas, 1990-2017
The map shows trends per station in chlorophyll concentrations per station in the upper 10 m of the water column, as observed during summer in the years 1990-2017. Red: significant increase; Green: significant decrease; Grey: no significant trend. Small symbols: ≤10 years of data; Large symbols: >10 years of data.
Average concentrations and trends of surface chlorophyll-a in Europe's transitional, coastal and marine waters
Average summer surface chlorophyll-a concentration (left) and trends (right), in locations recently updated (last update>2016) with at least 5 years of observations, in the period between 1980 and 2021. Green circles indicate stations with significant (p<0.05) decreasing trends (i.e., improving); orange circles show stations with significant (p<0.05) increasing trends (i.e., deteriorating); and grey circles show stations with no significant trends. Colour keys of symbols and values are included in the legend.
Trends in chlorophyll-a concentrations in European seas
Trends in chlorophyll-a concentrations in European seas (1980-2019)
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.
Trends in chlorophyll-a concentrations in Europe's seas (1980-2021)
Mean chlorophyll-a (Chla) concentrations in European seas, 2013-2017
The map shows chlorophyll concentrations in the upper 10 m of the water column, observed in the summers of the years 2013-2017.
Mean spring-summer concentrations of chlorophyll-like pigments
Notes: 'spring-summer' covers from April to September