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Impact de la mousson africaine sur la composition chimique de l'atmosphère en Afrique équatoriale

Idir Bouarar 1
1 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Important amounts of reactive gases and particles are emitted over equatorial Africa by human activities and naturally by forests, lightning and soils. The different transport processes that characterize this region during the monsoon season (e.g. African and Tropical Easterly Jets, deep convection) can redistribute these emissions downwind out of Africa and, hence, have an impact on the regional as well as on the global ozone (O3) budget. The main objective of my thesis is to improve our knowledge of the impact of these emissions and transport processes on the chemical composition of the atmosphere over equatorial Africa. For this purpose, the in-situ data measured during the AMMA field campaign which took place over west Africa in summer 2006 together with MOZAIC data and satellite observations are analysed and compared with LMDz_INCA global model simulations. This allows evaluation of the model performance over equatorial Africa and, on the other hand, to analyse the influence of emissions and transport processes during the monsoon season on the regional ozone budget. A description and first validation of the LMDz_INCA results against satellite data are presented in the first part of this thesis. The second part is dedicated to the impact of deep convection and lightning nitric oxides (NOx) emissions on ozone and its precursors. The impact of biomass burning emissions over central Africa is then discussed. Finally, the last part is dedicated to anlysis of the contribution of African and Asian emissions to the regional ozone budget.
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  • HAL Id : tel-00767800, version 1

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Idir Bouarar. Impact de la mousson africaine sur la composition chimique de l'atmosphère en Afrique équatoriale. Physique Atmosphérique et Océanique [physics.ao-ph]. Université Pierre et Marie Curie - Paris VI, 2009. Français. ⟨NNT : 2009PA066359⟩. ⟨tel-00767800⟩

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