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Analyse du profil vertical de l'ozone dans la basse troposphère à Paris

Abstract : Surface ozone measurements are not sufficient to understand the mechanisms of ozone formation in the lower troposphere. In this study, we have used instruments from the QUALAIR station, located in Paris center, that can measure vertical profiles of ozone, atmospheric dynamics parameters, and integrated contents of NO2 in the lowermost troposphere. First, a statistical analysis, using four years of ground based ozone LIDAR measurements (2011-2014), is done to understand the mechanisms responsible for the vertical gradient and the seasonal cycle of ozone in Paris. Then, in order to better assess the influence of transport on the spatial and temporal evolution of ozone, we focus on the results obtained from an instrumental campaign, organized in Paris, and during which continuous measurements of ozone, wind and turbulence in the atmospheric boundary layer were performed. The results show the impact of the entrainment of the residual layer into the mixed layer on the surface ozone variability in the morning at the local scale. A Lagrangian particle dispersion model (FLEXPART-WRF) is used to better assess the impact of the nocturnal transport of a clean ozone layer via nocturnal low level jets from Paris on the surface ozone evolution at the regional scale. Finally, a one dimensional chemical transport model (PACT 1D) is used to quantify the influence of vertical transport versus photochemistry on the evolution of boundary layer ozone during daytime.
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Submitted on : Wednesday, February 12, 2020 - 12:23:20 PM
Last modification on : Friday, December 3, 2021 - 11:42:52 AM
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  • HAL Id : tel-02475868, version 1


Amélie Klein. Analyse du profil vertical de l'ozone dans la basse troposphère à Paris. Physique Atmosphérique et Océanique []. Sorbonne Université, 2018. Français. ⟨NNT : 2018SORUS192⟩. ⟨tel-02475868⟩



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