Gas-particle interactions above a Dutch heathland: III. Modelling the influence of the NH 3 -HNO 3 -NH 4 NO 3 equilibrium on size-segregated particle fluxes

International audience ; Micrometeorological measurements of size-segregated particle number fluxes above Dutch heathlands and forests have repeatedly shown simultaneous apparent emission of particles with a diameter ( D p ) < 0.18 µm and deposition of larger particles when measured with optical particle counters. In order to assess whether this observation may be explained by the equilibrium reaction of ammonia (NH 3 ), nitric acid (HNO 3 ) and ammonium (NH 4 + ), a new numerical model is developed to predict the vertical concentration and flux profiles of the different species as modified... Mehr ...