Ozone Lidar Observations in the City of Paris: Seasonal Variability and Role of The Nocturnal Low Level Jet

Gérard Ancellet; François Ravetta; Jacques Pelon; Andrea Pazmino; Amélie Klein; Elsa Dieudonné; Patrick Augustin; Hervé Delbarre

doi:10.1051/epjconf/202023703022

Proceedings

Open Access

EPJ Web of Conferences 237, 03022 (2020)
https://doi.org/10.1051/epjconf/202023703022

Ozone Lidar Observations in the City of Paris: Seasonal Variability and Role of The Nocturnal Low Level Jet

Gérard Ancellet¹^*, François Ravetta¹, Jacques Pelon¹, Andrea Pazmino¹, Amélie Klein¹, Elsa Dieudonné², Patrick Augustin² and Hervé Delbarre²

¹ Laboratoire Atmosphere Milieux, Observations Spatiales (LATMOS), CNRS-INSU, Sorbonne Université,Université Versailles St Quentin, Paris, France
² LPCA Université du Littoral-Côte d’Opale, Dunkerque, France

^* Email: gerard.ancellet@latmos.ipsl.fr

Published online: 7 July 2020

Abstract

Ozone lidar measurements have been carried out in Paris during 4 years to characterize the seasonal variability of the vertical gradient within the urban planetary boundary layer (PBL). The interaction between NOx emission and thermal stability of the PBL is the main driver of the winter strong positive O3 gradient, while summer neutral gradient is related to weaker thermal stability and photochemical ozone production at the regional scale. Simultaneous lidar measurements of ozone and wind vertical profiles during 36 hours in September 2014 also show that the nocturnal low level jet (NLLJ) plays a significant role in the early morning ozone increase.

© The Authors, published by EDP Sciences, 2020

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.