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| Titel |
Nucleation and growth of new particles in Po Valley, Italy |
| VerfasserIn |
A. Hamed, J. Joutsensaari, S. Mikkonen, L. Sogacheva, M. Maso, M. Kulmala  , F. Cavalli, S. Fuzzi, M. C. Facchini, S. Decesari, M. Mircea, K. E. J. Lehtinen, A. Laaksonen |
| 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 ; 7, no. 2 ; Nr. 7, no. 2 (2007-01-23), S.355-376 |
| Datensatznummer |
250004463
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| Publikation (Nr.) |
 copernicus.org/acp-7-355-2007.pdf |
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| Zusammenfassung |
| Aerosol number distribution measurements are reported at San Pietro
Capofiume (SPC) station (44°39' N, 11°37' E) for the
time period 2002–2005. The station is located in Po Valley, the largest
industrial, trading and agricultural area in Italy with a high population
density. New particle formation was studied based on observations of the
particle size distribution, meteorological and gas phase parameters. The
nucleation events were classified according to the event clarity based on
the particle number concentrations, and the particle formation and growth
rates. Out of a total of 769 operational days from 2002 to 2005 clear events
were detected on 36% of the days whilst 33% are clearly non-event
days. The event frequency was high during spring and summer months with
maximum values in May and July, whereas lower frequency was observed in
winter and autumn months. The average particle formation and growth rates
were estimated as ~6 cm−3 s−1 and ~7 nm h−1,
respectively. Such high growth and formation rates are typical for polluted
areas. Temperature, wind speed, solar radiation, SO2 and O3
concentrations were on average higher on nucleation days than on non-event
days, whereas relative and absolute humidity and NO2 concentration were
lower; however, seasonal differences were observed. Backtrajectory analysis
suggests that during majority of nucleation event days, the air masses
originate from northern to eastern directions. We also study previously
developed nucleation event correlations with environmental variables and
show that they predict Po Valley nucleation events with variable success. |
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