Trend in winter oxidized nitrogen concentrations in coastal and open waters of the Baltic, North East Atlantic (Greater North Sea, Celtic Seas) and Mediterranean Sea (Adriatic Sea), 1985 - 2010

The figure shows trend in winter oxidized nitrogen (nitrate + nitrite) concentrations in coastal and open waters of the Baltic, North East Atlantic (Greater North Sea, Celtic Seas) and Mediterranean Sea (Adriatic Sea) (% of stations showing a statistically significant change within the period 1985-2010). Numbers in parentheses indicate the 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.