A Preliminary Evaluation Of Unexpected
Ozone Levels Measured In Falconara, Italy
Author(s)
G. Latini, R. Cocci Grifoni, G. Passerini & S. Tascini
Abstract
Ozone is a secondary pollutant that forms in the atmosphere through complex
chemical reactions mainly between Nitrogen Oxides ( NOx ) and Volatile
Organic Compounds (VOC ); such reactions are triggered by the presence of
solar radiation.
In this paper the Ozone formation in the Falconara area, an industrialized area
located on the central Adriatic coast of Italy, has been examined during a period
of high ozone concentrations that occurred in August 2000 to understand spike
phenomena registered in some ozone time series.
The selected data set consists of concentration hourly averages and related
elementary values, both provided by the monitoring network of Ancona
Province, Italy. We have analysed hourly averages to investigate the long-term
and medium-term behaviour of pollutants, while elementary values have been
used to study scattering phenomena (low frequency and high frequency
fluctuations in concentration levels) registered in some ozone time series.
Spectral analysis has been performed over the air pollutant time series; the
focus has been set on photochemical pollutants traced by ozone concentrations,
considering potential correlations with chemical precursors, and atmospheric
parameters such as solar radiation, wind velocity and air temperature. Analyses
conducted led to the hypothesis that the processes that generate ozone in
Falconara are more rapid and efficient than in other urban areas, and that ozone
production varies significantly over shorter spatial scales than in other urban
areas.
Results have yielded possible explanations regarding the origins of the
oscillations.
Keywords
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