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Experimental determination of the dry deposit rate of submicronic aerosols in a natural medium: influence of granulometry, micrometeorological parameters, and cover

Pierre DAMAY, doctorate of University of Rouen,  217 p., defended on the 7th april 2010

Document type > *Mémoire/HDR/Thesis

Keywords > atmospheric aerosol, percolation

Research Unit > IRSN/DEI/SECRE/LRC

Authors > DAMAY Pierre

Publication Date > 07/04/2010

Summary

To evaluate the impact of accidental or chronic pollutant releases on ecosystems, we must study the dry deposition of aerosols in rural areas. The lack of experimental data on the dry deposition velocity of particle sizes below 1 μm over rural environments leads to uncertainties regarding models and differences between them, which exceed one order of magnitude. The aim of this study is to develop a method, especially using an Electrical Low Pressure Impactor (Outdoor ELPI DEKATI) to determine aerosol dry deposition velocities (Vd) over rural areas through experimental measurements. This method is based on eddy covariance flux calculation and spectral analysis correction. Dry deposition velocities were obtained for atmospheric aerosols sizing from 7 nm to 2 μm, in the South-West of France on a flat terrain under varied meteorological conditions and varied substrates (maize, grass and earth). Vd was analysed as a function of the particle diameters, and the impact of micrometeorological parameters was studied.

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