Spatial variation in particle number size ... - Atmos. Chem. Phys
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Spatial variation in particle number size ... - Atmos. Chem. Phys
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Spatial variation in particle number size distributions in a large metropolitan area J. F. Mej´ıa1 , L. Morawska1 , and K. Mengersen2 1 International
Laboratory of Air Quality and Health, Queensland University of Technology, GPO Box 2434, Brisbane, Qld 4001, Australia 2 School of Mathematical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, QLD, 4001, Australia Received: 30 August 2007 – Published in Atmos. Chem. Phys. Discuss.: 26 November 2007 Revised: 25 January 2008 – Accepted: 28 January 2008 – Published: 28 February 2008
Abstract. Air quality studies have indicated that particle number size distribution (NSD) is unevenly spread in urban air. To date, these studies have focussed on differences in concentration levels between sampling locations rather than differences in the underlying geometries of the distributions. As a result, the existing information on the spatial variation of the NSD in urban areas remains incomplete. To investigate this variation in a large metropolitan area in the southern hemisphere, NSD data collected at nine different locations during different campaigns of varying duration were compared using statistical methods. The spectra were analysed in terms of their modal structures (the graphical representation of the number size distribution function), cumulative distribution and number median diameter (NMD). The study found that with the exception of one site all distributions were bimodal or suggestive of bimodality. In general, peak concentrations were below 30 nm and NMDs below 50 nm, except at a site dominated by diesel trucks, where it shifted to around 50 and 60 nm respectively. Ultrafine particles (UFPs (
