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| Titel |
Influence of medium range transport of particles from nucleation burst on particle number concentration within the urban airshed |
| VerfasserIn |
H. C. Cheung, L. Morawska, Z. D. Ristovski, D. Wainwright |
| 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. 11 ; Nr. 12, no. 11 (2012-06-07), S.4951-4962 |
| Datensatznummer |
250011223
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| Publikation (Nr.) |
 copernicus.org/acp-12-4951-2012.pdf |
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| Zusammenfassung |
| An elevated particle number concentration (PNC) observed during nucleation
events could play a significant contribution to the total particle load and
therefore to the air pollution in the urban environments. Therefore, a field
measurement study of PNC was commenced to investigate the temporal and
spatial variations of PNC within the urban airshed of Brisbane, Australia.
PNC was monitored at urban (QUT), roadside (WOO) and semi-urban (ROC) areas
around the Brisbane region during 2009. During the morning traffic peak
period, the highest relative fraction of PNC reached about 5% at QUT and
WOO on weekdays. PNC peaks were observed around noon, which correlated with
the highest solar radiation levels at all three stations, thus suggesting
that high PNC levels were likely to be associated with new particle
formation caused by photochemical reactions. Wind rose plots showed
relatively higher PNC for the NE direction, which was associated with
industrial pollution, accounting for 12%, 9% and 14% of overall PNC
at QUT, WOO and ROC, respectively. Although there was no significant
correlation between PNC at each station, the variation of PNC was well
correlated among three stations during regional nucleation events. In
addition, PNC at ROC was significantly influenced by upwind urban pollution
during the nucleation burst events, with the average enrichment factor of
15.4. This study provides an insight into the influence of regional
nucleation events on PNC in the Brisbane region and it the first study to
quantify the effect of urban pollution on semi-urban PNC through the
nucleation events. |
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