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| Titel |
Aerosol-ozone correlations during dust transport episodes |
| VerfasserIn |
P. Bonasoni, P. Cristofanelli, F. Calzolari, U. Bonafè, F. Evangelisti, A. Stohl, S. Zauli Sajani, R. Dingenen, T. Colombo, Y. Balkanski |
| 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 ; 4, no. 5 ; Nr. 4, no. 5 (2004-08-03), S.1201-1215 |
| Datensatznummer |
250001934
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| Publikation (Nr.) |
 copernicus.org/acp-4-1201-2004.pdf |
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| Zusammenfassung |
| Its location in the Mediterranean region and its physical characteristics
render Mt. Cimone (44°11′ N, 10°42′ E), the highest peak of the
Italian northern Apennines (2165 m asl), particularly suitable to study the
transport of air masses from the north African desert area to Europe. During
these northward transports 12 dust events were registered in measurements of
the aerosol concentration at the station during the period June–December
2000, allowing the study of the impact of mineral dust transports on free
tropospheric ozone concentrations, which were also measured at Mt. Cimone.
Three-dimensional backward trajectories were used to determine the air mass
origin, while TOMS Aerosol Index data for the Mt. Cimone area were used to
confirm the presence of absorbing aerosol over the measurement site.
A trajectory statistical analysis allowed identifying the main source areas
of ozone and aerosols. The analysis of these back trajectories showed that
central Europe and north and central Italy are the major pollution source
areas for ozone and fine aerosol, whereas the north African desert regions
were the most important source areas for coarse aerosol and low ozone
concentrations. During dust events, the Mt. Cimone mean volume concentration
for coarse particles was 6.18 µm3/cm3 compared to 0.63 µm3/cm3
in dust-free conditions, while the ozone concentrations
were 4% to 21% lower than the monthly mean background values. Our
observations show that surface ozone concentrations were lower than the
background values in air masses coming from north Africa, and when these air
masses were also rich in coarse particles, the lowest ozone values were
registered. Moreover, preliminary results on the possible impact of the dust events on
PM10 and ozone values measured in Italian urban and rural areas showed that during
the greater number of the considered dust events, significant PM10 increases and ozone
decreases have occurred in the Po valley. |
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