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A note on the effects of inorganic seed aerosol on the oxidation state of secondary organic aerosol-α-Pinene ozonolysis

Huang, Dan Dan and Zhang, Xuan and Dalleska, Nathan F. and Lignell, Hanna and Coggon, Matthew M. and Chan, Chi-Ming and Flagan, Richard C. and Seinfeld, John H. and Chan, Chak K. (2016) A note on the effects of inorganic seed aerosol on the oxidation state of secondary organic aerosol-α-Pinene ozonolysis. Journal of Geophysical Research. Atmospheres, 121 (20). pp. 12476-12483. ISSN 2169-897X. http://resolver.caltech.edu/CaltechAUTHORS:20170106-155452341

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Abstract

We compare the oxidation state and molecular composition of α-pinene-derived secondary organic aerosol (SOA) by varying the types and surface areas of inorganic seed aerosol that are used to promote the condensation of SOA-forming vapors. The oxidation state of α-pinene SOA is found to increase with inorganic seed surface area, likely a result of enhanced condensation of low-volatility organic compounds on particles versus deposition on the chamber wall. α-Pinene SOA is more highly oxygenated in the presence of sodium nitrate (SN) seed than ammonium sulfate seed. The relative abundance of semivolatile monomers and low-volatility dimer components that account for more than half of α-pinene SOA mass is not significantly affected by the composition of seed aerosol. Enhanced uptake of highly oxidized small carboxylic acids onto SN seed particles is observed, which could potentially explain the observed higher SOA oxidation state in the presence of SN seed aerosol. Overall, our results demonstrate that a combined effect of seed aerosol composition and surface area leads to an increase in the O:C atomic ratio of α-pinene SOA by as much as a factor of 2.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/2016JD025999DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/2016JD025999/abstractPublisherArticle
ORCID:
AuthorORCID
Dalleska, Nathan F.0000-0002-2059-1587
Coggon, Matthew M.0000-0002-5763-1925
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Chan, Chak K.0000-0001-9687-8771
Additional Information:© 2016 American Geophysical Union. Received 25 SEP 2016; Accepted 10 OCT 2016; Accepted article online 12 OCT 2016; Published online 31 OCT 2016. This work was funded by the HKUST Sponsorship scheme for Targeted Strategic Partnerships and U.S. National Science Foundation grant AGS-1523500. Data used to generate the figures are available upon request.
Funders:
Funding AgencyGrant Number
Hong Kong University of Science and TechnologyUNSPECIFIED
NSFAGS-1523500
Subject Keywords:aerosol oxidation state; inorganic seed aerosol; highly oxygenated small carboxylic acids
Record Number:CaltechAUTHORS:20170106-155452341
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20170106-155452341
Official Citation:Huang, D. D., X. Zhang, N. F. Dalleska, H. Lignell, M. M. Coggon, C.-M. Chan, R. C. Flagan, J. H. Seinfeld, and C. K. Chan (2016), A note on the effects of inorganic seed aerosol on the oxidation state of secondary organic aerosol —α-Pinene ozonolysis, J. Geophys. Res. Atmos., 121, 12,476–12,483, doi:10.1002/2016JD025999
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73317
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:07 Jan 2017 00:24
Last Modified:02 May 2017 18:22

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