Relating cloud condensation nuclei activity and oxidation level of α-pinene secondary organic aerosols

dc.contributor.authorFrosch, Mia
dc.contributor.authorBilde, Merete
dc.contributor.authorDeCarlo, Peter F.
dc.contributor.authorJurányi, Zsófia
dc.contributor.authorTritscher, Torsten
dc.contributor.authorDommen, Josef
dc.contributor.authorDonahue, Neil M.
dc.contributor.authorGysel, Martin
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorBaltensperger, Urs
dc.date.accessioned2024-07-24T11:32:59Z
dc.date.available2024-07-24T11:32:59Z
dc.date.issued2011-11-30
dc.description.abstractDuring a series of smog chamber experiments, the effects of chemical and photochemical aging on the ability of organic aerosols generated from ozonolysis of α-pinene to act as cloud condensation nuclei (CCN) were investigated. In particular, the study focused on the relation between oxygenation and the CCN-derived single hygroscopicity parameter κ for different experimental conditions: varying precursor concentrations (10–40 ppb), different OH sources (photolysis of HONO either with or without the addition of NO or ozonolysis of tetramethylethylene), and exposure to light. Oxygenation was described by the contribution of the aerosol mass spectrometer (AMS) mass fragment m/z 44 to the total organic signal (f44) and the oxygen to carbon molar ratio (O/C), likewise determined with AMS. CCN activity, described by the hygroscopicity parameter κ, was determined with a CCN counter. It was found that f44 increases with decreasing precursor concentration and with chemical aging, whereas neither of these affects CCN activity. Overall, κ is largely independent of O/C in the range 0.3 < O/C < 0.6 (0.07 < f44 < 0.12), although an empirical unweighted least squares fit was determined: κ = (0.071 ± 0.02) · (O/C) + (0.0785 ± 0.009) for particles with diameter in the range 59–200 nm. Growth kinetics of activating secondary organic aerosols were found to be comparable to those of ammonium sulfate and were not influenced by chemical aging.
dc.identifier.doi10.1029/2011jd016401
dc.identifier.issn2169-8996
dc.identifier.issn2169-897X
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46599
dc.issueD22
dc.language.isoen
dc.publisherWiley
dc.relation.ispartofJournal of Geophysical Research: Atmospheres
dc.spatialHoboken
dc.subject.ddc550 - Geowissenschaften
dc.titleRelating cloud condensation nuclei activity and oxidation level of α-pinene secondary organic aerosols
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume116
dspace.entity.typePublication
fhnw.InventedHereNo
fhnw.ReviewTypeAnonymous ex ante peer review of a complete publication
fhnw.affiliation.hochschuleHochschule für Technikde_CH
fhnw.affiliation.institutlnstitut für Sensorik und Elektronikde_CH
fhnw.openAccessCategoryClosed
fhnw.publicationStatePublished
relation.isAuthorOfPublication54997bb8-cf4a-4120-b0c7-f8e731e8eea1
relation.isAuthorOfPublication05dd9a19-7a24-4325-805a-2d121483b168
relation.isAuthorOfPublication.latestForDiscovery05dd9a19-7a24-4325-805a-2d121483b168
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