Aerosol dry deposition on vegetative canopies. Part I: Review of present knowledge

This paper reviews the present knowledge of aerosol dry deposition, with respect to modelling and experimental aspects. In the first part, special attention is given to the existing mechanistic models, either with an analytical or a differential structure. Their predictions are compared against available measurements for grass and forest environments, obtained under controlled aerosol size and aerodynamic conditions. The observed differences are largely related to the parameterisation of the aerosol collection within the canopy. In the second part, existing experimental results are reviewed and a synthesis is provided through different inter-comparisons concerning: (1) the influence of atmospheric stability on fine particle deposition, (2) the evolution of coarse aerosol deposition with aerodynamic conditions and (3) the aerosol size dependence of deposition on grass and forest canopies. A wider compilation of measurements obtained on different canopies is finally proposed.