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| Titel |
Ozone over the Western Mediterranean Sea – results from two years of shipborne measurements |
| VerfasserIn |
K. Velchev, F. Cavalli, J. Hjorth, E. Marmer, E. Vignati, F. Dentener, F. Raes |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 11, no. 2 ; Nr. 11, no. 2 (2011-01-24), S.675-688 |
| Datensatznummer |
250009192
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| Publikation (Nr.) |
 copernicus.org/acp-11-675-2011.pdf |
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| Zusammenfassung |
| Ozone, along with other air pollutants, has been measured for two years from
a monitoring station placed on a cruise ship that follows a regular track in
the Western Mediterranean between April and October. Conditions favouring
high ozone levels have been studied by analysis of weather maps and back
trajectories. This analysis was focused on a transect over the open sea in
the South Western Mediterranean between Tunis and Palma de Mallorca. High
ozone levels were found in situations with an anticyclonic circulation over
the Western Mediterranean when subsidence brings air masses down from
altitudes between 1000 and 3500 m a.s.l. Analysis of composite
meteorological maps suggests a relevant contribution of breeze circulation
to subsidence during events with high surface ozone concentrations; this
points to an important contribution from local ozone formation. A detailed
back trajectory analysis of the origin of air masses with high ozone
concentrations was carried out for two "hot spots" for ozone pollution, in
the Gulf of Genoa and between Naples and Palermo, respectively. The main
cause of high ozone levels in the Gulf of Genoa was found to be outflow from
the Po Valley and the Genoa area while such episodes along the
Naples-Palermo transect were most often associated with trajectories from
the Rome or Naples areas. Analysis of the relationship between measured
concentrations of Black Carbon and ozone allowed to evaluate the degree of
photochemical "ageing" of the air masses encountered along the route of the
cruise ship. |
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