Approaches to modelling local nitrogen deposition and concentrations in the context of Natura 2000: Background document
Hertel , O. (Aarhus University, Roskilde(Danemark). National Environmental Research Institute) | Theobald , M. (Universidad Politécnica de Madrid, Madrid(Espagne).) | Cellier , Pierre (INRA , Thiverval-Grignon (France). UMR 1091 Environnement et Grandes Cultures) | Bleeker , A. (Energy Research Centre of the Netherlands, Petten(Pays-Bas).) | Bruce , D. (Northern Ireland Environment Agency, Belfast(Islande).) | Frohn , L. M. (Aarhus University, Roskilde(Danemark). National Environmental Research Institute,) | Hill , R. (Westlakes Scientific Consulting, Cumbria(Royaume Uni).) | Noordijk , E. (Netherlands Environmental Assessment Agency, Bilthoven(Pays-Bas).) | Sharp , M. (SAC, Bush Estate, Midlothian(Royaume Uni).) | van Pul , A. (National Institute for Public Health and the Environment, Bilthoven(Pays-Bas).) | van Zanten , M. (National Institute for Public Health and the Environment, Bilthoven(Pays-Bas).)
Transport-chemistry models are useful and well-used tools in the environmental assessment of impacts of atmospheric N on Natura 2000 sites. Impacts arise from two groups of reactive nitrogen compounds: reduced nitrogen compounds (NH3 and its reaction product NH4+) and oxidised nitrogen compounds (NO, NO2 and their reaction products). Often the contributions from these two groups are of the same magnitude, but close to intensive livestock farms, the contribution from NH3 may dominate. Oxidised nitrogen compounds contribute to the long-range transport component of nitrogen deposition, but may for most practical purposes be disregarded in local scale assessments. Local scale assessments, therefore, concentrate on the assessment of NH3 deposition from local agricultural sources.
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