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Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes

Ng, N. L. and Chhabra, P. S. and Chan, A. W. H. and Surratt, J. D. and Kroll, J. H. and Kwan, A. J. and McCabe, D. C. and Wennberg, P. O. and Sorooshian, A. and Murphy, S. M. and Dalleska, N. F. and Flagan, R. C. and Seinfeld, J. H. (2007) Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes. Atmospheric Chemistry and Physics, 7 (19). pp. 5159-5174. ISSN 1680-7316. doi:10.5194/acp-7-5159-2007.

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Secondary organic aerosol (SOA) formation from the photooxidation of one monoterpene (α-pinene) and two sesquiterpenes (longifolene and aromadendrene) is investigated in the Caltech environmental chambers. The effect of NOx on SOA formation for these biogenic hydrocarbons is evaluated by performing photooxidation experiments under varying NOx conditions. The NOx dependence of α-pinene SOA formation follows the same trend as that observed previously for a number of SOA precursors, including isoprene, in which SOA yield (defined as the ratio of the mass of organic aerosol formed to the mass of parent hydrocarbon reacted) decreases as NOx level increases. The NOx dependence of SOA yield for the sesquiterpenes, longifolene and aromadendrene, however, differs from that determined for isoprene and α-pinene; the aerosol yield under high-NOx conditions substantially exceeds that under low-NOx conditions. The reversal of the NOx dependence of SOA formation for the sesquiterpenes is consistent with formation of relatively low-volatility organic nitrates, and/or the isomerization of large alkoxy radicals leading to less volatile products. Analysis of the aerosol chemical composition for longifolene confirms the presence of organic nitrates under high-NOx conditions. Consequently the formation of SOA from certain biogenic hydrocarbons such as sesquiterpenes (and possibly large anthropogenic hydrocarbons as well) may be more efficient in polluted air.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ng, N. L.0000-0001-8460-4765
Chan, A. W. H.0000-0001-7392-4237
Surratt, J. D.0000-0002-6833-1450
Wennberg, P. O.0000-0002-6126-3854
Sorooshian, A.0000-0002-2243-2264
Murphy, S. M.0000-0002-6415-2607
Dalleska, N. F.0000-0002-2059-1587
Flagan, R. C.0000-0001-5690-770X
Seinfeld, J. H.0000-0003-1344-4068
Additional Information:© Author(s) 2007. This work is licensed under a Creative Commons License. Published by Copernicus Publications on behalf of the European Geosciences Union. Received: 7 June 2007 – Published in Atmos. Chem. Phys. Discuss.: 12 July 2007. Revised: 14 September 2007 – Accepted: 29 September 2007 – Published: 8 October 2007. This research was funded by U.S. Department of Energy Biological and Environmental Research Program grant DE-FG02-05ER63983. This material is based in part on work supported by the National Science Foundation (NSF) under grant ATM-0432377. The Waters LCT Premier XT time-of-flight mass spectrometer interfaced to a Waters UPLC system was purchased in 2006 with a grant from the National Science Foundation, Chemistry Research Instrumentation and Facilities Program (CHE-0541745). The LCQ Ion Trap mass spectrometer was purchased in 1997 with funds from the National Science Foundation through the CRIF program (CHE-9709233). J.D. Surratt is supported in part by the U.S. EPA under the STAR Graduate Fellowship Program. A.J. Kwan acknowledges the support of a NSF graduate research fellowship. The authors would like to thank M. Shahgohli of the Chemistry Department at Caltech for her useful communications regarding high-resolution mass spectrometry.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-05ER63983
Environmental Protection Agency (EPA)UNSPECIFIED
NSF Graduate Research FellowshipUNSPECIFIED
Issue or Number:19
Record Number:CaltechAUTHORS:NGNacp07b
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Official Citation:Ng, N. L., Chhabra, P. S., Chan, A. W. H., Surratt, J. D., Kroll, J. H., Kwan, A. J., McCabe, D. C., Wennberg, P. O., Sorooshian, A., Murphy, S. M., Dalleska, N. F., Flagan, R. C., and Seinfeld, J. H.: Effect of NOx level on secondary organic aerosol (SOA) formation from the photooxidation of terpenes, Atmos. Chem. Phys., 7, 5159-5174, 2007.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9306
Deposited By: Archive Administrator
Deposited On:11 Dec 2007
Last Modified:08 Nov 2021 20:58

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