Influence of gas-to-particle partitioning on the hygroscopic and droplet activation behaviour of α-pinene secondary organic aerosol

dc.contributor.authorJurányi, Zsófia
dc.contributor.authorGysel, Martin
dc.contributor.authorDuplissy, Jonathan
dc.contributor.authorWeingartner, Ernest
dc.contributor.authorTritscher, Torsten
dc.contributor.authorDommen, Josef
dc.contributor.authorHenning, Silvia
dc.contributor.authorZiese, Markus
dc.contributor.authorKiselev, Alexej
dc.contributor.authorStratmann, Frank
dc.contributor.authorGeorge, Ingrid
dc.contributor.authorBaltensperger, Urs
dc.date.accessioned2024-08-13T11:54:13Z
dc.date.available2024-08-13T11:54:13Z
dc.date.issued2009-08-05
dc.description.abstractHygroscopic properties of secondary organic aerosol (SOA) formed by photooxidation of different concentrations (10–27 or 220–270 ppb) of α-pinene precursor were investigated at different relative humidities (RH) using a hygroscopicity tandem differential mobility analyzer (HTDMA, RH = 95–97%) and using the mobile version of the Leipzig Aerosol Cloud Interaction Simulator (LACIS-mobile, RH = 98–99.3%). In addition, the cloud condensation nuclei (CCN) activity was measured applying two CCN counters (CCNC). An apparent single-hygroscopicity parameter, κ, of ∼0.09, ∼0.07–0.13, and ∼0.02–0.04 was derived from CCNC, HTDMA and LACIS data, respectively, assuming the surface tension of pure water. Closure between HTDMA and CCNC data was achieved within experimental uncertainty, whereas closure between LACIS and CCNC was only achieved by assuming a concentration-dependent surface tension reduction, consequently resulting in lower CCNC-derived κ values. Comparing different experimental techniques at varying precursor concentrations in more detail reveals further open questions. Varying precursor concentration influences hygroscopic growth factors at subsaturated RH, while it has no effect on the CCN activation. This difference in behaviour might be caused by precursor concentration-dependent surface tension depression or changing droplet solution concentration dependence of the water activity coefficient with varying SOA composition. Furthermore, evidence was found that the SOA might need several seconds to reach the equilibrium growth factor at high RH.
dc.identifier.doi10.1039/b904162a
dc.identifier.issn1463-9076
dc.identifier.issn1463-9084
dc.identifier.urihttps://irf.fhnw.ch/handle/11654/46661
dc.issue36
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.ispartofPhysical Chemistry Chemical Physics
dc.spatialLondon
dc.subject.ddc550 - Geowissenschaften
dc.titleInfluence of gas-to-particle partitioning on the hygroscopic and droplet activation behaviour of α-pinene secondary organic aerosol
dc.type01A - Beitrag in wissenschaftlicher Zeitschrift
dc.volume11
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.pagination8091-8097
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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