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| Titel |
North Atlantic Oscillation and tropospheric ozone variability in Europe: model analysis and measurements intercomparison |
| VerfasserIn |
F. S. R. Pausata, L. Pozzoli, E. Vignati, F. J. Dentener |
| 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 ; 12, no. 14 ; Nr. 12, no. 14 (2012-07-23), S.6357-6376 |
| Datensatznummer |
250011332
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| Publikation (Nr.) |
 copernicus.org/acp-12-6357-2012.pdf |
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| Zusammenfassung |
| Ozone pollution represents a serious health and environmental problem. While
ozone pollution is mostly produced by photochemistry in summer, elevated
ozone concentrations can also be influenced by long range transport driven by
the atmospheric circulation and stratospheric ozone intrusions. We analyze
the role of large scale atmospheric circulation variability in the North
Atlantic basin in determining surface ozone concentrations over Europe. Here,
we show, using ground station measurements and a coupled atmosphere-chemistry
model simulation for the period 1980–2005, that the North Atlantic
Oscillation (NAO) does affect surface ozone concentrations – on a monthly
timescale, over 10 ppbv in southwestern, central and northern Europe –
during all seasons except fall. The commonly used NAO index is able to
capture the link existing between atmospheric dynamics and surface ozone
concentrations in winter and spring but it fails in summer. We find that the
first Principal Component, computed from the time variation of the sea level
pressure (SLP) field, detects the atmosphere circulation/ozone relationship
not only in winter and spring but also during summer, when the atmospheric
circulation weakens and regional photochemical processes peak. Given the NAO
forecasting skill at intraseasonal time scale, the first Principal Component
of the SLP field could be used as an indicator to identify areas more exposed
to forthcoming ozone pollution events. Finally, our results suggest that the
increasing baseline ozone in western and northern Europe during the 1990s
could be related to the prevailing positive phase of the NAO in that period. |
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