The Nine Year Report: Acidification of Surface Water in Europe and North America. Long-term Developments (1980s and 1990s) Lykewille, Anke; Johannessen, Merete; Traaen, Tor [Norsk Inst. for Vannforskning, Oslo (Norway)]; Jeffries, Dean [National Water Research Inst., Burlington, ON (Canada)]; Raddum, Gunnar [Bergen Univ. (Norway)]; Stoddard, John [Dymamac, EPA, (United States)] 54 ENVIRONMENTAL SCIENCES; INTERNATIONAL COOPERATION; LAKES; RIVERS; ACIDIFICATION; WATER CHEMISTRY; POLLUTION; LONG-RANGE TRANSPORT; WATER POLLUTION; NORTH AMERICA; SULFUR; NITROGEN; ECOSYSTEMS; AQUATIC ECOSYSTEMS; CLIMATES; ENVIRONMENT As discussed in this report, during the last ten years international emission reduction measures in Europe and North America have reduced the atmospheric sulphur deposition by 50%. Nitrogen deposition has stayed almost constant. Trends in surface water chemistry indicate that sulphate concentrations are decreasing and the decreases in the 1990s are larger than in the 1980s. Decreasing sulphate concentrations emphasize the importance of nitrate as the second important acidifying anion. Besides nitrogen deposition, the overall nitrogen status of ecosystems, changes in climate or climate extremes and hydrology can have strong influences on leaching of excess nitrate (and ammonium) from a watershed. This work is part of The International Cooperative Programme on Assessment and Monitoring of Acidification of Rivers and Lakes. 69 refs., 57 figs., 34 tabs. Norsk Inst. for Vannforskning, Oslo (Norway) OSTI as DE98773798 Norway 1998-12-31 English Technical Report Other Information: PBD: 1997 Medium: P; Size: 168 p. https://doi.org/ ON: DE98773798; ISBN 82-577-3195-1 [] NIVA-O-3637/97 Other: ON: DE98773798; ISBN 82-577-3195-1; TRN: NO9805292 NW; SCA: 540310; PA: NW-98:005292; EDB-99:056684; SN: 98001995628 2008-02-04 342713