Nitrate concentrations in rivers between 1992 and 2008 in different sea regions of Europe.

Figure expired Created 12 Oct 2010 Published 04 Jan 2011 Last modified 26 Aug 2017
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The sea region data series are calculated as the average of annual mean data from river monitoring stations in each sea region. The data thus represents rivers or river basins draining into that particular sea. Only complete series after inter/extrapolation are included (see indicator specification). Two regions are not shown in the figure due to a lack of data (Barents Sea: 1 station, Norwegian Sea: 2 stations); these stations have NO3 concentrations below 0.8 mg/l N.

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Number of rivers stations per region is given in paranthesis:

Atlantic Ocean (392), Baltic Sea (480), Black Sea (374), Mediterranean Sea (286), North Sea (486)

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