Analyse multi-instrumentale de l'influence de la variabilité de la hauteur de couche limite sur la distribution verticale des oxydes d'azote en région parisienne

Elsa Dieudonné 1
1 TROPO - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Human activities, and therefore important sources of pollution, are concentrated in cities, giving them a major role in air quality and climate change. Quantifying the impact of urban emissions at the regional and global scale requires to characterize the export of anthropogenic urban pollutants. In the frame of this PhD thesis, we studied the distribution of nitrogen oxides (NOx) in Paris region, with a focus on the influence of boundary layer (BL) depth variability on their vertical distribution. To do this, we analyzed, compared and confronted measurements from ground-based and space-borne instruments: in-situ NO2 measurements from the AIRPARIF network, integrated NO2 content from the Qualair station UV-visible spectrometer SAOZ and from the space-borne instruments SCIAMACHY and GOME-2, BL depth from the Qualair station backscatter microlidar. The building-up of this database required numerous algorithmic developments, whether regarding the determination of BL depth from the lidar observations, or the filtration of SAOZ observations in presence of clouds. The combined study of BL depth and NOx distribution variability allowed us to clarify the relationships between ground-level concentration and integrated content, and underlined the interest of a ground-based and city-centered integrated content measurement to estimate the urban emissions of NOx. Furthermore, this work underlined the existence of strong vertical gradients in the urban BL, showing that the hypothesis of an homogeneous vertical profile often used in satellite inversions is irrelevant. Finally, we used the available observations to establish, analyze and discuss the conditions of validity of an empirical relationship linking the integrated content of NO2 in the BL to its surface concentration.
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https://tel.archives-ouvertes.fr/tel-00807665
Contributor : Elsa Dieudonné <>
Submitted on : Thursday, April 4, 2013 - 10:20:17 AM
Last modification on : Friday, January 10, 2020 - 3:42:33 PM
Long-term archiving on: Friday, July 5, 2013 - 4:16:51 AM

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  • HAL Id : tel-00807665, version 1

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Elsa Dieudonné. Analyse multi-instrumentale de l'influence de la variabilité de la hauteur de couche limite sur la distribution verticale des oxydes d'azote en région parisienne. Physique Atmosphérique et Océanique [physics.ao-ph]. Université Pierre et Marie Curie - Paris VI, 2012. Français. ⟨tel-00807665⟩

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