Analysis of the Day-to-day Variability of Ozone Vertical Profiles in the Lower Troposphere During the 2022 Paris ACROSS Campaign

Gerard Ancellet,Camille Viatte,Anne Boynard,Francois Ravetta,Jacques Pelon,Cristelle Cailteau-Fischbach,Pascal Genau, Julie Capo, Axel Roy,Philippe Nedelec

Atmospheric chemistry and physics（2024）SCI 1区SCI 2区

Univ Versailles St Quentin

Cited 0|Views24

Abstract

The variability of ozone vertical profiles in the Paris area is analyzed using 21 d of lidar monitoring of the lower-troposphere ozone vertical profiles and planetary boundary layer (PBL) vertical structure evolution in summer 2022. Characterization of the pollution regional transport is based on daily ozone analysis of the Copernicus Atmospheric Service (CAMS) ensemble model and on backward trajectories. The CAMS simulations of the ozone plume between the surface and 3 km are consistent with the ozone measurements. Comparisons with the tropospheric ozone column retrieved by satellite observations of the Infrared Atmospheric Sounding Interferometer (IASI) show that IASI observations can capture the day-to-day variability of the 0-3 km ozone column only when the maximum altitude of the ozone plume is higher than 2 km. The lidar ozone vertical structure above the city center is also in good agreement with the PBL growth during the day and with the formation of the residual layer during the night. The analysis of four ozone pollution events shows that the thickness of the PBL during the day and the advection of regional-scale plumes above the PBL can significantly change the ozone concentrations above Paris. Advection of ozone-poor concentrations in the free troposphere during a Saharan dust event is able to mitigate ozone photochemical production. On the other hand, the advection of a pollution plume from continental Europe with high ozone concentrations > 140 mu g m-3 maintained high concentrations in the surface layer despite a temperature decrease and cloud cover development.

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