Formation of Organic Aerosols from the Oxidation of Biogenic Hydrocarbons |
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Authors: | THORSTEN HOFFMANN JAY R ODUM FRANK BOWMAN DONALD COLLINS DIETER KLOCKOW RICHARD C FLAGAN JOHN H SEINFELD |
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Institution: | (1) Institut für Spektrochemie und angewandte Spektroskopie, 44139 Dortmund, Germany;(2) Department of Environmental Engineering Science, California Institute of Technology, Pasadena, CA, 91125, U.S.A.;(3) Department of Chemical Engineering, California Institute of Technology, Pasadena, CA, 91125, U.S.A. |
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Abstract: | Measurements of aerosol formation during thephotooxidation of -pinene, -pinene,d-3-carene, d-limonene, ocimene, linalool, terpinene-4-ol, andtrans-caryophyllene were conducted in anoutdoor smog chamber. Daylight experiments in thepresence of
and dark experiments withelevated ozone concentrations were performed. Theevolution of the aerosol was simulated by theapplication of a gas/particle absorption model inconnection with a chemical reaction mechanism. Thefractional aerosol yield is shown to be a function ofthe organic aerosol mass concentration andtemperature. Ozone and, for selected hydrocarbons, theNO3 reaction of the compounds were found torepresent efficient routes to the formation ofcondensable products. For initial hydrocarbon mixingratios of about 100 ppb, the fractional aerosol yieldsfrom daylight runs have been estimated to be 5%for open-chain hydrocarbons, such as ocimene andlinalool, 5–25% for monounsaturated cyclicmonoterpenes, such as -pinene, d-3-carene, orterpinene-4-ol, and 40% for a cyclic monoterpenewith two double bonds like d-limonene. For the onlysesquiterpene investigated, trans-caryophyllene, afractional aerosol yield of close to 100% wasobserved. The majority of the compounds studied showedan even higher aerosol yield during dark experimentsin the presence of ozone. |
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Keywords: | biogenic hydrocarbons ozone nitrate radicals aerosol formation gas/particle partitioning |
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