Mean winter surface concentrations of nitrate and nitrite in the Greater North Sea, the Celtic Seas and the Northeast Atlantic, 2004
Only stations with more than two years data are included.
Coastal stations are marked by circles and ICES open-water stations (>20 km from coast) by squares. Level of classification is based on the 20 % 40 %, 60 % and 80 % percentiles of the indicator presented.
Geographical coverage note: North Sea, Celtic Seas and the Northeast Atlantic