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You are here: Home / Data and maps / Maps and graphs / Trends in mean summer chlorophyll a concentrations in in European regional seas in 1985-2005 (left panel) and 1985-2004 (right panel)

Trends in mean summer chlorophyll a concentrations in in European regional seas in 1985-2005 (left panel) and 1985-2004 (right panel)

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Countries included in the analysis: Belgium, Denmark, Estonia, Finland, Italy, Latvia, Lithuania, Malta, Netherlands, Norway, Poland, Sweden, and United Kingdom

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Bulgaria, Germany, Greece, France, Iceland, Ireland, Portugal, Rumania, Slovenia, Spain and Turkey are members of the EEA but have reported no data or time series of less than 5 years duration. Open Sea stations refer to stations located in international waters. Left figure: Stationwise trends in chlorphyll-a concentrations at stations that include 2005 observations (% of stations showing statistically significant change, within the years 1985-2005). Numbers in parentheses indicates number of stations included in the analysis for each country. Country information differs from Figure 1 because the trend analysis requires a minimum of 5 years of information. Number of stations in a given country are not proportional to length of coastline. Right figure: Stationwise trends in chlorphyll-a concentrations at stations that include observations made prior to 2005 previously reported to the EEA (% of stations showing statistically significant change, within the years 1985-2004). Numbers in parentheses indicates number of stations included in the analysis for each country. The reasons for information not being updated include discontinuation of some stations, countries not reporting their observations to the EEA or ICES (OSPAR and HELCOM data), and time consuming quality assurance procedures at ICES resulting in a backlog of data. Staions and countries represented differ from those shown on Figure 1 because trend analysis requires a minimum duration of 5 years.

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