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Published September 28, 2005 | Published + Supplemental Material
Journal Article Open

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


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.

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.

Attached Files

Published - 233-Kroll-2005.pdf

Supplemental Material - grl20228-sup-0001-t01.txt


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