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Cited by 317

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Effects of Aqueous-Phase and Photochemical Processing on Secondary Organic Aerosol Formation and Evolution in Beijing, China

Xu, Weiqi, Han, Tingting, Du, Wei, Wang, Qingqing, Chen, Chen, Zhao, Jian, Zhang, Yingjie, Li, Jie, Fu, Pingqing, Wang, Zifa, Worsnop, Douglas R., Sun, Yele·2017·Environmental Science & Technology

Abstract

Secondary organic aerosol (SOA) constitutes a large fraction of OA, yet remains a source of significant uncertainties in climate models due to incomplete understanding of its formation mechanisms and evolutionary processes. Here we evaluated the effects of photochemical and aqueous-phase processing on SOA composition and oxidation degrees in three seasons in Beijing, China, using high-resolution aerosol mass spectrometer measurements along with positive matrix factorization. Our results show that aqueous-phase processing has a dominant impact on the formation of more oxidized SOA (MO–OOA), and the contribution of MO–OOA to OA increases substantially as a function of relative humidity or liquid water content. In contrast, photochemical processing plays a major role in the formation of less oxidized SOA (LO–OOA), as indicated by the strong correlations between LO–OOA and odd oxygen (O x = O 3 + NO 2 ) during periods of photochemical production (R 2 = 0.59–0.80). Higher oxygen-to-carbon ratios of SOA during periods with higher RH were also found indicating a major role of aqueous-phase processing in changing the oxidation degree of SOA in Beijing. Episodes analyses further highlight that LO–OOA plays a more important role during the early stage of the formation of autumn/winter haze episodes while MO–OOA is more significant during the later evolution period.

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Metadata

Authors
Xu, W., Han, T., Du, W., Wang, Q., Chen, C., Zhao, J., Zhang, Y., Li, J., Fu, P., Wang, Z., Worsnop, D. R., & Sun, Y.
Venue
Environmental Science & Technology
Published
2017-01-06
Volume
51
Issue
2
Pages
762-770
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
OpenAlex
W2567098959
Cited by
317
References
55
FWCI
9.66
Type
journal article
Language
en
Open access
closed

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