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Etude et modélisation des variations spatio-temporelles des distributions d'aérosols en zone côtière méditerranéenne

Abstract : With 70% of the planet surface covered by seas and oceans, the presence of sea salt particles, produced mainly by the waves breaking, represents a major constituent in the geochemical cycle of the atmosphere and in the earth radiative budget. ln order to anticipate the possible changes, our knowledge has to progress towards a more precise description and modelling of surface flux. The present study proposes a general framework for a better characterization of particles injected in the atmosphere by the waves breaking. One of the objectives is to study the parametrical and numerical models' validity in order to predict the spatio-temporal sea spray's variation at a local and regional scale. A first part of this work is dedicated to the study of the aerosol concentrations' spatial variation in a Mediterranean coastal zone.To do so, a coupling between a meso-scale meteorological code (RAMS) and an aerosol determinist model (Medex) developed by the LSEET has been operated. The predictions of the coupling are confronted with the data recorded during an experimental campaign led in May 2007 at Porquerolles Island. The second part is focused on the parametrical model improvement : with the help of the data recorded in May 2007, the seasonal influence has been corrected, thus refining the Medex predictions. The third part is dedicated to the parameters influencing the sea spray concentrations during an episode of Mistral. It is shown that other parameters than the wind speed act, such as fetch or the height of the marine boundary layer. The last part proposes the development of a numerical transport model of aerosols. The first results show the influence of the atmospheric stability on the horizontal and vertical profiles of sprays.
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Romain Blot. Etude et modélisation des variations spatio-temporelles des distributions d'aérosols en zone côtière méditerranéenne. Océan, Atmosphère. Université du Sud Toulon Var, 2009. Français. ⟨tel-00651785⟩

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