Spatial Variation of Aerosol Chemical Composition and Organic Components Identified by Positive Matrix Factorization in the Barcelona Region

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• 作者：Claudia Mohr ; Peter F. DeCarlo ; Maarten F. Heringa ; Roberto Chirico ; Ren茅 Richter ; Monica Crippa ; Xavier Querol ; Urs Baltensperger ; Andr茅 S. H. Pr茅v么t
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：September 1, 2015
• 年：2015
• 卷：49
• 期：17
• 页码：10421-10430
• 全文大小：662K
• ISSN：1520-5851

文摘

The spatial distribution of PM₁ components in the Barcelona metropolitan area was investigated using on-road mobile measurements of atmospheric particle- and gas-phase compounds during the DAURE campaign in March 2009. Positive matrix factorization (PMF) applied to organic aerosol (OA) data yielded 5 factors: hydrocarbon-like OA (HOA), cooking OA (COA), biomass burning OA (BBOA), and low volatility and semivolatile oxygenated OA (LV-OOA and SV-OOA). The area under investigation (鈭?00 km²) was divided into six zones (city center, harbor, industrial area, precoastal depression, 2 mountain ranges) for measurements and data analysis. Mean zonal OA concentrations are 4.9鈥?.5 渭g m^鈥?. The area is heavily impacted by local primary emissions (HOA 14鈥?8%, COA 10鈥?8%, BBOA 10鈥?2% of OA); concentrations of traffic-related components, especially black carbon, are biased high due to the on-road nature of the measurements. The formation of secondary OA adds more than half of the OA burden outside the city center (SV-OOA 14鈥?0%, LV-OOA 17鈥?2% of OA). A case study of one measurement drive from the shore to the precoastal mountain range furthest downwind of the city center indicates the importance of nonfossil over anthropogenic secondary OA based on OA/CO.