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


Autoria(s): Cheung, Hing Cho; Morawska, Lidia; Ristovski, Zoran; Wainwright, D.
Data(s)

2012

Resumo

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).

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/51420/

Publicador

Copernicus GmbH

Relação

http://eprints.qut.edu.au/51420/3/51420.pdf

http://www.scopus.com/inward/record.url?eid=2-s2.0-84861947801&partnerID=40&md5=529ef99a27b513a6bbbde0690d65e398

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.

Direitos

Copyright 2012 the authors.

Fonte

School of Chemistry, Physics & Mechanical Engineering; Science & Engineering Faculty

Tipo

Journal Article