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Modeling the Size Distribution and Chemical Composition of Secondary Organic Aerosols during the Reactive Uptake of Isoprene-Derived Epoxydiols under Low-Humidity Condition

Octaviani, Mega ORCID iD icon; Shrivastava, Manish; Zaveri, Rahul A.; Zelenyuk, Alla; Zhang, Yue; Rasool, Quazi Z.; Bell, David M.; Riva, Matthieu; Glasius, Marianne; Surratt, Jason D.


Reactive uptake of isoprene epoxydiols (IEPOX), which are isoprene oxidation products, onto acidic sulfate aerosols is recognized to be an important mechanism for the formation of isoprene-derived secondary organic aerosol (SOA). While a mechanistic understanding of IEPOX-SOA formation exists, several processes affecting their formation remain uncertain. Evaluating mechanistic IEPOX-SOA models with controlled laboratory experiments under longer atmospherically relevant time scales is critical. Here, we implement our latest understanding of IEPOX-SOA formation within a box model to simulate the measured reactive uptake of IEPOX on polydisperse ammonium bisulfate seed aerosols within an environmental Teflon chamber. The model is evaluated with single-particle measurements of size distribution, volume, density, and composition of aerosols due to IEPOX-SOA formation at time scales of hours. We find that the model can simulate the growth of particles due to IEPOX multiphase chemistry, as reflected in increases of the mean particle size and volume concentrations, and a shift of the number size distribution to larger sizes. The model also predicts the observed evolution of particle number mean diameter and total volume concentrations at the end of the experiment. ... mehr

Postprint §
DOI: 10.5445/IR/1000141256
Veröffentlicht am 11.11.2022
DOI: 10.1021/acsearthspacechem.1c00303
Zitationen: 5
Web of Science
Zitationen: 4
Zitationen: 6
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung – Forschungsbereich Troposphäre (IMK-TRO)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 11.2021
Sprache Englisch
Identifikator ISSN: 2472-3452, 2472-3452
KITopen-ID: 1000141256
HGF-Programm 12.11.32 (POF IV, LK 01) Advancing atmospheric and Earth system models
Erschienen in ACS earth and space chemistry
Verlag American Chemical Society (ACS)
Band 5
Heft 11
Seiten 3247–3257
Vorab online veröffentlicht am 10.11.2021
Nachgewiesen in Dimensions
Web of Science
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