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| Titel |
Sub-continental transport mechanisms and pathways during two ozone episodes in northern Spain |
| VerfasserIn |
G. Gangoiti, A. Albizuri, L. Alonso, M. Navazo, M. Matabuena, V. Valdenebro, J. A. García, M. M. Millán |
| 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 ; 6, no. 6 ; Nr. 6, no. 6 (2006-05-08), S.1469-1484 |
| Datensatznummer |
250003817
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| Publikation (Nr.) |
 copernicus.org/acp-6-1469-2006.pdf |
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| Zusammenfassung |
| Two ozone episodes (occurring in June 2001 and June 2003)
in the air quality monitoring network of the Basque Country (BC) are
analyzed. The population information threshold was exceeded in many stations
(urban, urban-background and rural). During this type of episodes, forced by
a blocking anticyclone over the British Isles, ozone background
concentrations over the area increase after the import of pollution from
both, the continental Europe and the western Mediterranean areas (Gangoiti
et al., 2002). For the present analysis, emphasis is made in the search for
transport mechanisms, pathways and area sources contributing to the build-up
of the episodes. Contributions from a selection of 17 urban and industrial
conglomerates in the western European Atlantic (WEA) and the western
Mediterranean (WM) are shown after the results of a coupled RAMS-HYPACT
modelling system. Meteorological simulations are tested against both the
high-resolution wind data recorded at the BC coastal area by a boundary
layer wind-profiler radar (Alonso et al., 1998) and the wind soundings
reported by the National Centres of Meteorology at a selection of European
and north-African sites. Results show that during the accumulation phase of
the episodes, background ozone concentrations increase in the whole
territory as a consequence of transport from the Atlantic coast of France
and the British Channel. For the peak phase, intrusions from new sources,
located at the Western Mediterranean, Southern France, Ebro Valley, and,
occasionally, the area of Madrid are added, resulting in a further increase
in the ozone concentrations. Direct day and night transport within the
north-easterly winds over the sea from the WEA source region, and night-time
transport within the residual layer over continental areas (southern France,
the Ebro Valley, and central Iberia) modulate the import sequence of
pollutants and the local increase of ozone concentrations. The alternative
direct use of low resolution meteorological data for the estimation of
back-trajectories shows a more simple transport scheme with no contributions
neither from the Western Mediterranean nor from the Madrid area. |
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