title: First measurements of source apportionment of organic aerosols in the Southern Hemisphere.
abstract: An Aerodyne Aerosol Mass Spectrometer was deployed at five urban schools to examine spatial and temporal variability of organic aerosols (OA) and positive matrix factorization (PMF) used for the first time in the Southern Hemisphere to apportion the sources of the OA across an urban area. The sources identified included hydrocarbon-like OA (HOA), biomass burning OA (BBOA) and oxygenated OA (OOA). At all sites, the main source was OOA, which accounted for 62-73% of the total OA mass and was generally more oxidized compared to those reported in the Northern Hemisphere. This suggests that there are differences in aging processes or regional sources in the two hemispheres. Unlike HOA and BBOA, OOA demonstrated instructive temporal variations but not spatial variation across the urban area. Application of cluster analysis to the PMF-derived sources offered a simple and effective method for qualitative comparison of PMF sources that can be used in other studies.
authors.affiliation: International Laboratory for Air Quality and Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD 4001, Australia.
authors.forename: Leigh R
authors.initials: LR
authors.lastname: Crilley
authors.forename: Godwin A
authors.initials: GA
authors.lastname: Ayoko
authors.forename: Lidia
authors.initials: L
authors.lastname: Morawska
mesh_terms: D000336:Aerosols / Q000032:analysis*; D000393:Air Pollutants / Q000032:analysis*; D000397:Air Pollution / Q000706:statistics & numerical data; D018533:Biomass; D004784:Environmental Monitoring; D006838:Hydrocarbons / Q000032:analysis*; D013058:Mass Spectrometry
chemical_list: D000336:Aerosols; D000393:Air Pollutants; D006838:Hydrocarbons
keywords: Aerosol mass spectrometry; Organic aerosols; Positive matrix factorization; Urban environments