Author(s)

C. Mensink, A. Colles, R. De Fre and W. Swaans

Abstract

Over the period October 1997 - November 1998, NHg concentrations were measured at 108 locations in Flanders using diffusion tube samplers. The measurement averaging time was three to four weeks allowing the representation of temporal agricultural phenomena like periods of manure application, maize plantation and periods of prohibition of manure application. The results of the measurement campaign were compared with NH] concentrations obtained by the Operational Priority Substances (OPS) model. Model results show concentrations that are systematically lower than the measurements, especially in areas with high emissions. The statistical analysis shows a better comparison in summer time (full emission load) than in wintertime (no manure applications). A significant improv

Keywords