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Reactive intermediates revealed in secondary organic aerosol formation from isoprene

by Loza, Christine L , Chan, ManNin , Wennberg, Paul O , Eddingsaas, Nathan C , Kwan, Alan J , Hersey, Scott P , Surratt, Jason D , Flagan, Richard C , Chan, Arthur W.H , Seinfeld, John H

in Acidity / Acids - chemistry / Aerosols / Aerosols - chemistry / Anthropogenic factors / Atmosphere / Atmospheric aerosols / Atmospheric chemistry / ATMOSPHERIC CHEMISTRY SPECIAL FEATURE / Butadienes / Butadienes - chemistry / Catalysis / Dimers / Environmental Monitoring - methods / Gas Chromatography-Mass Spectrometry - methods / Hemiterpenes - chemistry / Isoprene / Lead / Light / Mass spectroscopy / Models, Chemical / Nitrates - chemistry / nitrogen dioxide / Oxidation / Oxygen - chemistry / Pentanes - chemistry / Photochemistry - methods / Photooxidation / Physical Sciences / pollutants / Spectrometry, Mass, Electrospray Ionization - methods / Sulfates / Sulfates - chemistry / Sulfide compounds / sulfur dioxide / Thermal decomposition

2010

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Reactive intermediates revealed in secondary organic aerosol formation from isoprene

by Loza, Christine L , Chan, ManNin , Wennberg, Paul O , Eddingsaas, Nathan C , Kwan, Alan J , Hersey, Scott P , Surratt, Jason D , Flagan, Richard C , Chan, Arthur W.H , Seinfeld, John H

2010

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Reactive intermediates revealed in secondary organic aerosol formation from isoprene

by Loza, Christine L , Chan, ManNin , Wennberg, Paul O , Eddingsaas, Nathan C , Kwan, Alan J , Hersey, Scott P , Surratt, Jason D , Flagan, Richard C , Chan, Arthur W.H , Seinfeld, John H

2010

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Journal Article

Reactive intermediates revealed in secondary organic aerosol formation from isoprene

Loza, Christine L,

Chan, ManNin,

Wennberg, Paul O,

Eddingsaas, Nathan C,

Kwan, Alan J,

Hersey, Scott P,

Surratt, Jason D,

Flagan, Richard C,

Chan, Arthur W.H,

Seinfeld, John H

2010

Overview

Isoprene is a significant source of atmospheric organic aerosol; however, the oxidation pathways that lead to secondary organic aerosol (SOA) have remained elusive. Here, we identify the role of two key reactive intermediates, epoxydiols of isoprene (IEPOX = β-IEPOX + δ-IEPOX) and methacryloylperoxynitrate (MPAN), which are formed during isoprene oxidation under low- and high-NOx conditions, respectively. Isoprene low-NOx SOA is enhanced in the presence of acidified sulfate seed aerosol (mass yield 28.6%) over that in the presence of neutral aerosol (mass yield 1.3%). Increased uptake of IEPOX by acid-catalyzed particle-phase reactions is shown to explain this enhancement. Under high-NOx conditions, isoprene SOA formation occurs through oxidation of its second-generation product, MPAN. The similarity of the composition of SOA formed from the photooxidation of MPAN to that formed from isoprene and methacrolein demonstrates the role of MPAN in the formation of isoprene high-NOx SOA. Reactions of IEPOX and MPAN in the presence of anthropogenic pollutants (i.e., acidic aerosol produced from the oxidation of SO₂ and NO₂, respectively) could be a substantial source of \"missing urban SOA\" not included in current atmospheric models.

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Publisher

National Academy of Sciences,National Acad Sciences

Subject

Acidity

/ Acids - chemistry

/ Aerosols

/ Aerosols - chemistry

/ Anthropogenic factors

/ Atmosphere

/ Atmospheric aerosols