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Importance of Ship Emissions to Local Summertime Ozone Production in the Mediterranean Marine Boundary Layer: A Modeling Study

Division of Rende, CNR-Institute of Atmospheric Pollution Research, Rende 87036, Italy
CNR-Institute of Atmospheric Pollution Research, via Salaria km 29,300, Monterotondo 00015, Italy
Author to whom correspondence should be addressed.
Current Address: Biogeochemical Systems Department, Max Planck Institute for Biogeochemistry, Postfach 10 01 64, Hans-Knöll-Str. 10, Jena 07745, Germany
Atmosphere 2014, 5(4), 937-958;
Received: 22 September 2014 / Revised: 24 October 2014 / Accepted: 11 November 2014 / Published: 2 December 2014
Ozone concentrations in the Mediterranean area regularly exceed the maximum levels set by the EU Air Quality Directive, 2008/50/CE, a maximum 8-h mean of 120 μg·m-3, in the summer, with consequences for both human health and agriculture. There are a number of reasons for this: the particular geographical and meteorological conditions in the Mediterranean play a part, as do anthropogenic ozone precursor emissions from around the Mediterranean and continental Europe. Ozone concentrations measured on-board the Italian Research Council’s R. V. Urania during summer oceanographic campaigns between 2000 and 2010 regularly exceeded 60 ppb, even at night. The WRF/Chem (Weather Research and Forecasting (WRF) model coupled with Chemistry) model has been used to simulate tropospheric chemistry during the periods of the measurement campaigns, and then, the same simulations were repeated, excluding the contribution of maritime traffic in the Mediterranean to the anthropogenic emissions inventory. The differences in the model output suggest that, in large parts of the coastal zone of the Mediterranean, ship emissions contribute to 3 and 12 ppb to ground level daily average ozone concentrations. Near busy shipping lanes, up to 40 ppb differences in the hourly average ozone concentrations were found. It seems that ship emissions could be a significant factor in the exceedance of the EU directive on air quality in large areas of the Mediterranean Basin. View Full-Text
Keywords: ozone; Mediterranean; modeling; shipping ozone; Mediterranean; modeling; shipping
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Gencarelli, C.N.; Hedgecock, I.M.; Sprovieri, F.; Schürmann, G.J.; Pirrone, N. Importance of Ship Emissions to Local Summertime Ozone Production in the Mediterranean Marine Boundary Layer: A Modeling Study. Atmosphere 2014, 5, 937-958.

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