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Secondary organic aerosol formation from isoprene photooxidation under high-NO_x conditions

Kroll, Jesse H. and Ng, Nga L. and Murphy, Shane M. and Flagan, Richard C. and Seinfeld, John H. (2005) Secondary organic aerosol formation from isoprene photooxidation under high-NO_x conditions. Geophysical Research Letters, 32 (18). Art. No. L18808,. ISSN 0094-8276. doi:10.1029/2005GL023637.

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The oxidation of isoprene (2-methyl-1,3-butadiene) is known to play a central role in the photochemistry of the troposphere, but is generally not considered to lead to the formation of secondary organic aerosol (SOA), due to the relatively high volatility of known reaction products. However, in the chamber studies described here, we measure SOA production from isoprene photooxidation under high-NO_x conditions, at significantly lower isoprene concentrations than had been observed previously. Mass yields are low (0.9–3.0%), but because of large emissions, isoprene photooxidation may still contribute substantially to global SOA production. Results from photooxidation experiments of compounds structurally similar to isoprene (1,3-butadiene and 2- and 3-methyl-1-butene) suggest that SOA formation from isoprene oxidation proceeds from the further reaction of first-generation oxidation products (i.e., the oxidative attack of both double bonds). The gas-phase chemistry of such oxidation products is in general poorly characterized and warrants further study.

Item Type:Article
Related URLs:
URLURL TypeDescription
Ng, Nga L.0000-0001-8460-4765
Murphy, Shane M.0000-0002-6415-2607
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Alternate Title:Secondary organic aerosol formation from isoprene photooxidation under high-NOx conditions
Additional Information:© 2005 American Geophysical Union. Received 26 May 2005; revised 10 August 2005; accepted 22 August 2005; published 23 September 2005. This work was supported by the Department of Energy, Award DE-FG02-05ER63983, and the U.S. Environmental Protection Agency, grant RD-83107501-0; it has not been subjected to the EPA's required peer and policy review and therefore does not necessarily reflect the views of the Agency and no official endorsement should be inferred.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-05ER63983
Environmental Protection Agency (EPA)RD-83107501-0
Issue or Number:18
Record Number:CaltechAUTHORS:20150818-104004781
Persistent URL:
Official Citation:Kroll, J. H., N. L. Ng, S. M. Murphy, R. C. Flagan, and J. H. Seinfeld (2005), Secondary organic aerosol formation from isoprene photooxidation under high-NOx conditions, Geophys. Res. Lett., 32, L18808, doi:10.1029/2005GL023637.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59714
Deposited By: Irina Meininger
Deposited On:19 Aug 2015 22:47
Last Modified:10 Nov 2021 22:24

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