Deposition of nitrogen into the North Sea

de Leeuw [G.] ; Frohn [L.] ; Frydendall [J.] ; Hertel [O.] ; Jickells [T.] ; Kunz [G.J.] ; Schulz [M.] ; Skjøth [C. Ambelas] ; Sørensen [L.L.] ; Spokes [L.] ; Tamm [S.] ; Vignati [E.]