Hygroscopic growth and CCN activity of secondary organic aerosol produced from dark ozonolysis of γ-terpinene

Autor: Hichem Bouzidi, Layal Fayad, Cecile Coeur, Nicolas Houzel, Denis Petitprez, Alessandro Faccinetto, Junteng Wu, Alexandre Tomas, Jakub Ondráček, Jaroslav Schwarz, Vladimír Ždímal, Andreas Zuend
Přispěvatelé: Centre for Energy and Environment (CERI EE), Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Nord Europe), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT), Ecole nationale supérieure Mines-Télécom Lille Douai (IMT Lille Douai), Institut Mines-Télécom [Paris] (IMT), Laboratoire de Physico-Chimie de l'Atmosphère (LPCA), Université du Littoral Côte d'Opale (ULCO), Physicochimie des Processus de Combustion et de l’Atmosphère - UMR 8522 (PC2A), Université de Lille-Centre National de la Recherche Scientifique (CNRS), Czech Academy of Sciences [Prague] (CAS), Earth and Planetary Sciences Department [McGill University], McGill University = Université McGill [Montréal, Canada], Institute of Chemical Process Fundamentals (ICPF), Department of Atmospheric and Oceanic Sciences [Montréal]
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: Science of the Total Environment
Science of the Total Environment, Elsevier, 2022, 817, pp.153010. ⟨10.1016/j.scitotenv.2022.153010⟩
Science of the Total Environment, 2022, 817, pp.153010. ⟨10.1016/j.scitotenv.2022.153010⟩
ISSN: 0048-9697
1879-1026
DOI: 10.1016/j.scitotenv.2022.153010⟩
Popis: International audience; The hygroscopic growth factor (GF) and cloud condensation nuclei (CCN) activity of secondary organic aerosol (SOA) particles produced during dark ozonolysis of γ-terpinene under different reaction conditions were investigated. The SOA particles were produced in the presence or absence of cyclohexane, an OH scavenger; 1,3,5-trimethylbenzene, an anthropogenic volatile organic compound; and (NH4)2SO4 seed particles. A hygroscopicity tandem differential mobility analyzer was used to determine the GFs of the SOA particles at RHs ≤ 93%. For some experiments, a CCN counter was used for size-resolved measurement of CCN activation at supersaturation (S) in the range of 0.1 to 1%. The single hygroscopicity parameter κ was derived from both the GF and CCN measurements. Under subsaturated conditions, all the SOA (except those in the presence of the (NH4)2SO4 seeds) showed small GF values. These GFs demonstrated that SOA mass loading affected the GF. A decrease in the SOA mass loading led to increased GF and corresponding κGF values. However, in a supersaturation regime, the SOA mass loading and the size of the particles did not significantly alter the CCN activity of the SOA. Our CCN measurements showed higher κCCN values (κCCN = 0.20–0.24) than those observed in most monoterpene ozonolysis studies (κCCN = 0.1–0.14). This difference may have been due to the presence of the two endocyclic double bonds in the γ-terpinene structure, which may have affected the SOA chemical composition, in contrast to monoterpenes that contain an exocyclic double bond. Our comparisons of sub- and supersaturated conditions showed a larger range of κ values than other experiments. Average κCCN/κGF ratios of ~7 and 14 were obtained in the unseeded SOA experiments at low and high SOA mass loadings, respectively. The average κCCN of 0.23 indicated that the SOA produced during ozonolysis of γ-terpinene exhibited fairly high CCN activity.
Databáze: OpenAIRE
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