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Effect of solubility limitation on hygroscopic growth and cloud drop activation of SOA particles produced from traffic exhausts
Lund University, Sweden; Skåne Association of Local Authorities, Sweden.
Lund University, Sweden.
RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials. Lund University, Sweden.ORCID iD: 0000-0001-8650-4741
Lund University, Sweden.
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2018 (English)In: Journal of Atmospheric Chemistry, ISSN 0167-7764, E-ISSN 1573-0662, Vol. 75, no 4, p. 359-383Article in journal (Refereed) Published
Abstract [en]

Hygroscopicity measurements of secondary organic aerosol (SOA) particles often show inconsistent results between the supersaturated and subsaturated regimes, with higher activity as cloud condensation nucleus (CCN) than indicated by hygroscopic growth. In this study, we have investigated the discrepancy between the two regimes in the Lund University (LU) smog chamber. Various anthropogenic SOA were produced from mixtures of different precursors: anthropogenic light aromatic precursors (toluene and m-xylene), exhaust from a diesel passenger vehicle spiked with the light aromatic precursors, and exhaust from two different gasoline-powered passenger vehicles. Three types of seed particles were used: soot aggregates from a diesel vehicle, soot aggregates from a flame soot generator and ammonium sulphate (AS) particles. The hygroscopicity of seed particles with condensed, photochemically produced, anthropogenic SOA was investigated with respect to critical supersaturation (sc) and hygroscopic growth factor (gf) at 90% relative humidity. The hygroscopicity parameter κ was calculated for the two regimes: κsc and κgf, from measurements of sc and gf, respectively. The two κ showed significant discrepancies, with a κgf /κsc ratio closest to one for the gasoline experiments with ammonium sulphate seed and lower for the soot seed experiments. Empirical observations of sc and gf were compared to theoretical predictions, using modified Köhler theory where water solubility limitations were taken into account. The results indicate that the inconsistency between measurements in the subsaturated and supersaturated regimes may be explained by part of the organic material in the particles produced from anthropogenic precursors having a limited solubility in water. © 2018, The Author(s).

Place, publisher, year, edition, pages
2018. Vol. 75, no 4, p. 359-383
Keywords [en]
Critical supersaturation, Hygroscopic growth, Particles, SOA, Solubility, Traffic exhausts
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-36613DOI: 10.1007/s10874-018-9380-5Scopus ID: 2-s2.0-85057081647OAI: oai:DiVA.org:ri-36613DiVA, id: diva2:1271269
Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2019-06-28Bibliographically approved

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