Ozone dry deposition and resistances onto green grassland in summer in central Spain

Measurements of ozone concentrations, and meteorological and surface parame ters were carried out over a flat green grassland in northwest Spain, in Ju ly 1995. Turbulent parameters and sensible and latent heat fluxes were calc ulated using the gradient technique. Fluxes and deposition velocity and res istances were evaluated assuming that the diffusivity for heat fluxes was e qual to pollutant diffusivity. The daily average value of dry deposition ve locity was 6 mm s(-1) but it was influenced by wind velocity and atmospheri c stability. Resistances have been calculated according to a simple resista nce model and a comparison between theoretical and measured values has been made.