Transport des polluants et variabilité atmosphérique du CO2 en Sibérie : Apport des mesures in situ aéroportées

Abstract : The work presented here intends to characterize the variations of atmospheric concentrations of CO2, CO, O3 and ultrafine particles, over a large scale aircraft transect above Siberia, during three intensive YAK-AEROSIB campaigns in April 2006, September 2006 and August 2007, respectively. Pollutant and greenhouse gases distribution in this poorly studied region is needed to model atmospheric long range transport. I show here that CO concentrations at the time of the campaigns is broadly affected by (1) advection of Chinese pollutants through baroclinic perturbations, (2) advection (diffuse or not) of European pollutants at various altitudes, (3) and of biomass burning from Central Asia. This set of factors is analyzed through a novel statistical technique based on clustering of backward transport simulated by the FLEXPART Lagrangian model. Large observed CO2 gradients in summer are matched against vertical mixing in GCM simulated CO2. At last I present ultrafine particle measurements, and a possible nucleation summer maximum in the clean, continental mid-troposphere.
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Jean-Daniel Paris. Transport des polluants et variabilité atmosphérique du CO2 en Sibérie : Apport des mesures in situ aéroportées. Océan, Atmosphère. Université de Versailles-Saint Quentin en Yvelines, 2008. Français. ⟨tel-00358602⟩

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