Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 6 8 2009 10.5194/bg-6-1627-2009 http://www.biogeosciences.net/6/1627/2009/ http://www.biogeosciences.net/6/1627/2009/bg-6-1627-2009.html http://www.biogeosciences.net/6/1627/2009/bg-6-1627-2009.pdf 1627 1645 2009-08-12 Aerosol fluxes and particle growth above managed grassland E. Nemitz en@ceh.ac.uk J. R. Dorsey M. J. Flynn M. W. Gallagher A. Hensen J.-W. Erisman S. M. Owen U. Dämmgen M. A. Sutton Centre for Ecology and Hydrology (Edinburgh), Bush Estate, Penicuik, Midlothian, EH26 0QB, UK School for Earth, Atmospheric and Environmental Sciences, Univ. of Manchester, PO Box 88, Manchester, M60 1QD, UK Energy Research Centre for the Netherlands (ECN), 1755-ZG Petten, The Netherlands Institute for Environmental and Natural Sciences, University of Lancaster, UK Institute for Agroecology, Federal Agricultural Research Centre, Braunschweig, Germany Particle deposition velocities (11–3000 nm diameter) measured above grassland by eddy covariance during the EU GRAMINAE experiment in June 2000 averaged 0.24 and 0.03 mm s^−1 to long (0.75 m) and short (0.07 m) grass, respectively. After fertilisation with 108 kg N ha^−1 as calcium ammonium nitrate, sustained apparent upward fluxes of particles were observed. Analysis of concentrations and fluxes of potential precursor gases, including NH₃, HNO₃, HCl and selected VOCs, shows that condensation of HNO₃ and NH₃ on the surface of existing particles is responsible for this effect. A novel approach is developed to derive particle growth rates at the field scale, from a combination of measurements of vertical fluxes and particle size-distributions. For the first 9 days after fertilization, growth rates of 11 nm particles of 7.04 nm hr^−1 and 1.68 nm hr^−1 were derived for day and night-time conditions, respectively. This implies total NH₄NO₃ production rates of 1.11 and 0.44 μg m^−3 h^−1, respectively. The effect translates into a small error in measured ammonia fluxes (0.06% day, 0.56% night) and a large error in NH₄⁺ and NO₃^− aerosol fluxes of 3.6% and 10%, respectively. 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