期刊
ATMOSPHERIC RESEARCH
卷 122, 期 -, 页码 391-400出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2012.12.004
关键词
PM2.5; Inorganic water-soluble ions; Polycyclic aromatic hydrocarbons; Ion balance; Positive matrix factorization
资金
- Shenzhen National Climate Observatory
In this study, PM2.5 has been measured in the suburb of Shenzhen. The mean mass concentration of PM2.5 was 101.6 +/- 27.5 mu g m(-3) in winter and 32.7 +/- 19.7 mu g m(-3) in summer. The high PM2.5 concentration level is probably due to the serious emissions from the Pearl River Delta where Shenzhen is located. The sum contribution of water-soluble ions was an average of 53.1 +/- 7.6% in winter and 56.3 +/- 15.2% in summer, while the sum contribution of polycyclic aromatic hydrocarbons was an average of 7.5 +/- 1.4% in winter and 20.5 +/- 7.0% in summer. Obvious seasonal variations of PM2.5 and chemical composition were partly because of the different origins of air mass reaching Shenzhen. SO42-, NH4+ and NO3- were the major water-soluble ions and fluorene and pyrene were the major polycyclic aromatic hydrocarbons in PM2.5. Additionally, six factors including combustion emission factor, fresh sea-salt factor, secondary nitrate factor, airborne dust factor, secondary aerosol factor and aged sea-salt factor were identified by EPA positive matrix factorization. (c) 2012 Elsevier B.V. All rights reserved.
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