Study of the submicronic aerosol dry deposition on urban surfaces in a wind tunnel.
Résumé
To quantify the impact of an accidental or chronic pollution by an aerosol on an urban environment, dry deposition transfer coefficient, or dry deposition velocity, must be determined for the different surfaces composing this environment (roofs, walls and ground) as a function of the micrometeorological conditions. There are few data for the urban environment. Data have been acquired in laboratory but they are poorly representative of urban environments. Moreover field measurements are not related to micrometeorological parameters that are very important in the deposition phenomenon. In this study, the dry deposition velocities of a tracer aerosol, representative of the coagulation mode of the atmospheric aerosol, on three urban surfaces and for three wind speed were quantified experimentally in a wind tunnel. A significant increase of the deposition velocities with the roughness of the surfaces and the flow speed was observed. These dry deposition velocity measurements were achieved together with turbulence measurements.
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