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Influence of medium range transport of particles from nucleation burst on particle number concentration within the urban airshed

Cheung, Hing Cho, Morawska, Lidia, Ristovski, Zoran, & Wainwright, D. (2012) Influence of medium range transport of particles from nucleation burst on particle number concentration within the urban airshed. Atmospheric Chemistry and Physics, 12(11), pp. 4951-4962.

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Abstract

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. © 2012 Author(s).

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5 citations in Scopus
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4 citations in Web of Science®

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ID Code: 51420
Item Type: Journal Article
Additional Information: Export Date: 3 July 2012 Source: Scopus Language of Original Document: English Correspondence Address: Morawska, L.; International Laboratory for Air Quality and Health, Queensland University of Technology, Brisbane, QLD 4001, Australia; email: l.morawska@qut.edu.au
ISSN: 16807316
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 the authors.
Deposited On: 04 Jul 2012 17:02
Last Modified: 10 Jul 2012 15:10

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