期刊
ATMOSPHERIC ENVIRONMENT
卷 130, 期 -, 页码 172-179出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.atmosenv.2015.10.019
关键词
Secondary organic aerosol; Mass absorption coefficient; Photolysis rate; Atmospheric photochemistry; Photodegradation
资金
- US National Science Foundation (NSF) [AGS-1227579]
- NSF via the Graduate Research Fellowship Program
- Ford Foundation Predoctoral Fellowship Program of the National Academy of Science
- Undergraduate Research Opportunities Program at the University of California, Irvine
- Directorate For Geosciences [1227579] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences [1227579] Funding Source: National Science Foundation
Mass absorption coefficient (MAC) values were measured for secondary organic aerosol (SOA) samples produced by flow tube ozonolysis and smog chamber photooxidation of a wide range of volatile organic compounds (VOC), specifically: alpha-pinene, beta-pinene, beta-myrcene, d-limonene, farnesene, guaiacol, imidazole, isoprene, linalool, ocimene, p-xylene, 1-methylpyrrole, and 2-methylpyrrole. Both low-NO. and high-NO. conditions were employed during the chamber photooxidation experiments. MAC values were converted into effective molecular absorption cross sections assuming an average molecular weight of 300 g/mol for SOA compounds. The upper limits for the effective photolysis rates of SOA compounds were calculated by assuming unity photolysis quantum yields and convoluting the absorption cross sections with a time-dependent solar spectral flux. A more realistic estimate for the photolysis rates relying on the quantum yield of acetone was also obtained. The results show that condensed-phase photolysis of SOA compounds can potentially occur with effective lifetimes ranging from minutes to days, suggesting that photolysis is an efficient and largely overlooked mechanism of SOA aging. (C) 2015 Elsevier Ltd. All rights reserved.
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