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© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 16 May 2019

Submitted as: research article | 16 May 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

A study of the influence of tropospheric subsidence on spring and summer surface ozone concentrations at the JRC-Ispra station in northern Italy

Pavlos Kalabokas1, Niels Roland Jensen2, Mauro Roveri3, Jens Hjorth2,4, Maxim Eremenko5, Juan Cuesta5, Gaëlle Dufour5, Gilles Foret5, and Matthias Beekmann5 Pavlos Kalabokas et al.
  • 1Academy of Athens, Research Center for Atmospheric Physics and Climatology, Athens, Greece
  • 2European Commission, Joint Research Centre (JRC), Directorate for Energy, Transport and Climate, Air and Climate Unit, I-21027 Ispra (VA), Italy
  • 3European Commission, Joint Research Centre (JRC), Directorate for Nuclear Safety and Security, I-21027 Ispra (VA), Italy
  • 4Department of Environmental Science, iCLIMATE, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
  • 5Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA), UMR7583, CNRS, Université Paris-Est-Créteil, Université de Paris, Institut Pierre Simon Laplace, Créteil, France

Abstract. The influence of tropospheric ozone to the surface ozone concentrations is investigated at the monitoring station of JRC-Ispra, based on 10 years of measurements (2006–2015) of surface ozone data. In-situ hourly measurements of ozone and other air-pollutants, meteorological parameters and weekly averaged 7Be (as indicator of upper-tropospheric/stratospheric influence) and 210Pb measurements (as indicator of boundary layer influence), have been used for the analysis. It is observed that frequently 7Be and ozone weekly peaks coincide, which might be explained by the impact of deep atmospheric subsidence on surface ozone, particularly during late spring and early summer. Based on this observation, a detailed analysis of selected 7Be and ozone episodes occurring during that period of the year has been performed in order to further elucidate the mechanisms of tropospheric influence to the surface pollutant concentrations. For the analysis composite NOAA/ESRL reanalysis synoptic meteorological charts in the troposphere have been used as well as IASI satellite ozone measurements and NOAA-HYSPLIT back trajectories. The JRC-station hourly measurements during subsidence episodes show very low values of local pollution parameters (e.g. NOx, 222Rn, nephelometer data, PM10), close to zero. On the contrary, during these periods ozone levels reach usually values around 45–60 ppb during the afternoon hours but also show significantly higher values than the average during the night and morning hours, which is a sign of direct tropospheric influence to the surface ozone concentrations.

Pavlos Kalabokas et al.
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Short summary
The influence of tropospheric ozone to the surface measurements at a regional air pollution station in the pre-alpine area of N. Italy is investigated. During such episodes the local air pollution parameters show generally very low values, while the ozone levels reach high values, occasionally exceeding the ozone air quality standards. The better understanding of the ozone variability over the examined region will help in the formulation of more effective policies in environment and climate.
The influence of tropospheric ozone to the surface measurements at a regional air pollution...