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| Titel |
Observation of new particle formation in subtropical urban environment |
| VerfasserIn |
H. C. Cheung, L. Morawska, Z. D. Ristovski |
| 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 ; 11, no. 8 ; Nr. 11, no. 8 (2011-04-27), S.3823-3833 |
| Datensatznummer |
250009652
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| Publikation (Nr.) |
 copernicus.org/acp-11-3823-2011.pdf |
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| Zusammenfassung |
| The aim of this study was to characterise the new particle formation events
in a subtropical urban environment in the Southern Hemisphere. The study
measured the number concentration of particles and its size distribution in
Brisbane, Australia during 2009. The variation of particle number
concentration and nucleation burst events were characterised as well as the
particle growth rate which was first reported in urban environment of
Australia. The annual average NUFP, NAitken
and NNuc were 9.3×103, 3.7×103
and 5.6×103 cm−3, respectively. Weak
seasonal variation in number concentration was observed. Local traffic
exhaust emissions were a major contributor of the pollution (NUFP)
observed in morning which was dominated by the Aitken mode particles, while
particles formed by secondary formation processes contributed to the
particle number concentration during afternoon. Overall, 65 nucleation burst
events were identified during the study period. Nucleation burst events were
classified into two groups, with and without particles growth after the
burst of nucleation mode particles observed. The average particle growth
rate of the nucleation events was 4.6 nm h−1 (ranged from
1.79–7.78 nm h−1). Case studies of the nucleation burst events were
characterised including (i) the nucleation burst with particle growth which
is associated with the particle precursor emitted from local traffic exhaust
emission, (ii) the nucleation burst without particle growth which is due to
the transport of industrial emissions from the coast to Brisbane city or
other possible sources with unfavourable conditions which suppressed
particle growth and (iii) interplay between the above two cases which
demonstrated the impact of the vehicle and industrial emissions on the
variation of particle number concentration and its size distribution during
the same day. |
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