15 Nov 2022
15 Nov 2022
Status: this preprint is currently under review for the journal ACP.

Impact of different sources of precursors on a high-ozone event over Europe analysed with IASI+GOME2 multispectral satellite observations and model simulations

Sachiko Okamoto1, Juan Cuesta1, Matthias Beekmann2, Gaëlle Dufour2, Maxim Eremenko1, Kazuyuki Miyazaki3, Cathy Bonne4, Hiroshi Tanimoto5, and Hajime Akimoto5 Sachiko Okamoto et al.
  • 1Univ Paris Est Creteil and Université de Paris Cité, CNRS, LISA, F-94010 Créteil, France
  • 2Université de Paris Cité and Univ Paris Est Creteil, CNRS, LISA, F-75013 Paris, France
  • 3Jet Propulsion Laboratory (JPL), California Institute of Technology, Pasadena, 91109, CA, USA
  • 4Institut Pierre Simon Laplace (IPSL), AERIS data centre, Paris, 75252, France
  • 5National Institute for Environmental Studies, Tsukuba, 350-8506, Japan

Abstract. We examine the impact of different sources of ozone precursors on the daily evolution of successive major ozone pollution outbreaks across Europe in July 2017 by using a multispectral satellite approach called IASI+GOME2, and a tropospheric chemistry reanalysis called TCR-2. IASI+GOME2, combining IASI and GOME-2 measurements respectively in the infrared and the ultraviolet, allows the observation of the daily horizontal distribution of ozone in the lowermost troposphere (defined here as the atmospheric layer between the surface and 3 km above sea level). IASI+GOME2 observations show a fair capacity to depict near-surface ozone evolution as compared to surface measurements from 188 European stations for the period 15–27 July 2017.

At the beginning of this event (on 16 July), a major ozone outbreak is initially formed over the Iberian Peninsula likely linked with high temperature-induced enhancements of biogenic volatile organic compounds concentrations and collocated anthropogenic emissions. In the following days, the ozone plume splits into two branches, one being transported eastward across the Western Mediterranean and Italy, and the other one over Western and Central Europe. The southern branch encounters ozone precursors emitted over the Balkan Peninsula by wildfires along the coast of the Adriatic Sea and biogenic sources in the inland region of the Peninsula. Ozone concentrations of the northern plume enhance by photochemical production associated with anthropogenic sources of ozone precursors over Central Europe and by mixing with an ozone plume arriving from the North Sea that was originally produced over North America. Finally, both ozone branches are transported eastwards and mix gradually, as they reach the northern coast of the Black Sea. There, emissions from agricultural fires after harvesting clearly favor photochemical production of ozone within the pollution plume, which is advected eastwards in the following days. Based on satellite analysis, this paper shows the interplay of various ozone precursor sources to sustain a two-week long ozone pollution event over different parts of Europe.

Sachiko Okamoto et al.

Status: open (until 27 Dec 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on acp-2022-764', Anonymous Referee #1, 29 Nov 2022 reply
  • RC2: 'Comment on acp-2022-764', Anonymous Referee #2, 03 Dec 2022 reply

Sachiko Okamoto et al.

Sachiko Okamoto et al.


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Short summary
In this study, we examine the daily evolution of successive major ozone pollution outbreaks across Europe in July 2017 by using a multispectral satellite approach called IASI+GOME2, and a tropospheric chemistry reanalysis called TCR-2. This ozone outbreak is associated with several sources of ozone precursors: biogenic, anthropogenic and biomass burning emissions. These results are interesting with respect to a better understanding of ozone response to the emission changes.