International Laboratory for Air Quality and Health, Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, QLD 4001, Australia.
Environ Pollut. 2014 Jan;184:81-8. doi: 10.1016/j.envpol.2013.08.015. Epub 2013 Sep 13.
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.
在五个城市学校部署了 Aerodyne 气溶胶质谱仪，以研究有机气溶胶（OA）的时空变异性，并首次在南半球使用正矩阵因子分解（PMF）来分配城市地区 OA 的来源。确定的来源包括烃类 OA（HOA）、生物质燃烧 OA（BBOA）和含氧 OA（OOA）。在所有站点，主要来源是 OOA，占总 OA 质量的 62-73%，与在北半球报道的相比，通常更氧化。这表明在两个半球中存在老化过程或区域来源的差异。与 HOA 和 BBOA 不同，OOA 在整个城市地区表现出有益的时间变化，但没有空间变化。将聚类分析应用于 PMF 衍生的来源为 PMF 来源的定性比较提供了一种简单有效的方法，可用于其他研究。
