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https://doi.org/10.5194/acp-16-6721-2016
Title: | Substantial secondary organic aerosol formation in a coniferous forest: Observations of both day- and nighttime chemistry | Authors: | Lee, A.K.Y Abbatt, J.P.D Leaitch, W.R Li, S.-M Sjostedt, S.J Wentzell, J.J.B Liggio, J Macdonald, A.M |
Keywords: | aerosol formation atmospheric chemistry coniferous forest hydroxyl radical mountain region oxidation ozone temporal variation British Columbia Canada Whistler |
Issue Date: | 2016 | Citation: | Lee, A.K.Y, Abbatt, J.P.D, Leaitch, W.R, Li, S.-M, Sjostedt, S.J, Wentzell, J.J.B, Liggio, J, Macdonald, A.M (2016). Substantial secondary organic aerosol formation in a coniferous forest: Observations of both day- and nighttime chemistry. Atmospheric Chemistry and Physics 16 (11) : 6721-6733. ScholarBank@NUS Repository. https://doi.org/10.5194/acp-16-6721-2016 | Rights: | Attribution 4.0 International | Abstract: | Substantial biogenic secondary organic aerosol (BSOA) formation was investigated in a coniferous forest mountain region in Whistler, British Columbia. A largely biogenic aerosol growth episode was observed, providing a unique opportunity to investigate BSOA formation chemistry in a forested environment with limited influence from anthropogenic emissions. Positive matrix factorization of aerosol mass spectrometry (AMS) measurement identified two types of BSOA (BSOA-1 and BSOA-2), which were primarily generated by gas-phase oxidation of monoterpenes and perhaps sesquiterpenes. The temporal variations of BSOA-1 and BSOA-2 can be explained by gas-particle partitioning in response to ambient temperature and the relative importance of different oxidation mechanisms between day and night. While BSOA-1 arises from gas-phase ozonolysis and nitrate radical chemistry at night, BSOA-2 is likely less volatile than BSOA-1 and consists of products formed via gas-phase oxidation by OH radical and ozone during the day. Organic nitrates produced through nitrate radical chemistry can account for 22-33 % of BSOA-1 mass at night. The mass spectra of BSOA-1 and BSOA-2 have higher values of the mass fraction of m/z 91 (f91) compared to the background organic aerosol. Using f91 to evaluate BSOA formation pathways in this unpolluted, forested region, heterogeneous oxidation of BSOA-1 is a minor production pathway of BSOA-2. @ Author(s) 2016. | Source Title: | Atmospheric Chemistry and Physics | URI: | https://scholarbank.nus.edu.sg/handle/10635/183329 | ISSN: | 16807316 | DOI: | 10.5194/acp-16-6721-2016 | Rights: | Attribution 4.0 International |
Appears in Collections: | Staff Publications Elements |
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