期刊
SCIENTIFIC REPORTS
卷 7, 期 -, 页码 -出版社
NATURE PORTFOLIO
DOI: 10.1038/srep40311
关键词
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资金
- National Natural Science Foundation of China [21407158]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB05010300, XDB05040100]
- special fund of the State Key Joint Laboratory of Environment Simulation and Pollution Control [14Z04ESPCR]
- Environment Canada's Clean Air Regulatory Agenda (CARA) Science Program
- Toyota Motor Corporation
- Toyota Central Research and Development Laboratories Inc.
The organic component is the most abundant fraction of atmospheric submicron particles, while the formation mechanisms of secondary organic aerosol (SOA) are not fully understood. The effects of sulfate seed aerosols on SOA formation were investigated with a series of experiments carried out using a 9m(3) smog chamber. The presence of FeSO4 or Fe-2(SO4)(3) seed aerosols decreased SOA yields and increased oxidation levels in both ozonolysis and OH-oxidation of a-pinene compared to that in the presence of ZnSO4 or (NH4)(2)SO4. These findings were explained by metal-mediated aerosol-phase oxidation of organics: reactive radicals were generated on FeSO4 or Fe-2(SO4)(3) seed aerosols and reacted further with the organic mass. This effect would help to explain the high O/C ratios of organics in ambient particles that thus far cannot be reproduced in laboratory and model studies. In addition, the gap in the SOA yields between experiments with different seed aerosols was more significant in OH-oxidation experiments compared to ozonolysis experiments, while the gap in estimated O/C ratios was less obvious. This may have resulted from the different chemical compositions and oxidation levels of the SOA generated in the two systems, which affect the branching ratio of functionalization and fragmentation during aerosol oxidation.
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