Relating cloud condensation nuclei activity and oxidation level of α-pinene secondary organic aerosols
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Autor:innen
Frosch, Mia
Bilde, Merete
DeCarlo, Peter F.
Jurányi, Zsófia
Tritscher, Torsten
Dommen, Josef
Donahue, Neil M.
Baltensperger, Urs
Autor:in (Körperschaft)
Publikationsdatum
30.11.2011
Typ der Arbeit
Studiengang
Typ
01A - Beitrag in wissenschaftlicher Zeitschrift
Herausgeber:innen
Herausgeber:in (Körperschaft)
Betreuer:in
Übergeordnetes Werk
Journal of Geophysical Research: Atmospheres
Themenheft
DOI der Originalpublikation
Link
Reihe / Serie
Reihennummer
Jahrgang / Band
116
Ausgabe / Nummer
D22
Seiten / Dauer
Patentnummer
Verlag / Herausgebende Institution
Wiley
Verlagsort / Veranstaltungsort
Hoboken
Auflage
Version
Programmiersprache
Abtretungsempfänger:in
Praxispartner:in/Auftraggeber:in
Zusammenfassung
During 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.
Schlagwörter
Fachgebiet (DDC)
550 - Geowissenschaften
Veranstaltung
Startdatum der Ausstellung
Enddatum der Ausstellung
Startdatum der Konferenz
Enddatum der Konferenz
Datum der letzten Prüfung
ISBN
ISSN
2169-8996
2169-897X
2169-897X
Sprache
Englisch
Während FHNW Zugehörigkeit erstellt
Nein
Zukunftsfelder FHNW
Publikationsstatus
Veröffentlicht
Begutachtung
Peer-Review der ganzen Publikation
Open Access-Status
Closed
Lizenz
Zitation
FROSCH, Mia, Merete BILDE, Peter F. DECARLO, Zsófia JURÁNYI, Torsten TRITSCHER, Josef DOMMEN, Neil M. DONAHUE, Martin GYSEL, Ernest WEINGARTNER und Urs BALTENSPERGER, 2011. Relating cloud condensation nuclei activity and oxidation level of α-pinene secondary organic aerosols. Journal of Geophysical Research: Atmospheres. 30 November 2011. Bd. 116, Nr. D22. DOI 10.1029/2011jd016401. Verfügbar unter: https://irf.fhnw.ch/handle/11654/46599