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Figure

Average concentrations and trends of surface chlorophyll-a in transitional, coastal and marine waters surrounding Europe

Figure Created 04 Aug 2022 Published 04 Aug 2022 Last modified 07 May 2024
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This page was archived on 07 May 2024 with reason: Other (New version data-and-maps/figures/average-concentrations-left-and-trends-1 was published)
Summer surface chlorophyll-a concentration averages (left) and trends (right), in locations recently updated (last update>2015) with at least 5 years of observations, in the period between 1980 and 2019. Colour keys of symbols and values are included in the legend.

European data

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Additional information

• Average chlorophyll-a concentrations were calculated using data from observations in summer (May to September) from the upper 10m of the water column, in locations with annual data for the last 5-year period (2015-2019), transformed to the logarithmic scale.
• Data were aggregated into squares of 0.01 degree × 0.01 degree for coastal stations (within 20km of the coastline) and 0.05 degree × 0.05 degree for open water stations.
• 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.

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).

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Geographic coverage

Temporal coverage

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