Title: | Hygroscopic growth and CCN activity of secondary organic aerosol produced from dark ozonolysis of gamma-terpinene |
Author(s): | Bouzidi H; Fayad L; Coeur C; Houzel N; Petitprez D; Faccinetto A; Wu J; Tomas A; Ondracek J; Schwarz J; Zdimal V; Zuend A; |
Address: | "Laboratoire de Physico-Chimie de l'Atmosphere, Universite du Littoral Cote d'Opale, Dunkerque 59140, France; Institute of Chemical Process Fundamentals of the CAS, Department of Aerosols Chemistry and Physics, Prague CZ-16502, Czech Republic; IMT Lille Douai, Institut Mines-Telecom, Univ. Lille, Centre for Energy and Environment, 59000 Lille, France. Electronic address: hichem.bouzidi@univ-littoral.fr. Laboratoire de Physico-Chimie de l'Atmosphere, Universite du Littoral Cote d'Opale, Dunkerque 59140, France. Univ. Lille, CNRS PC2A, 59000 Lille, France. IMT Lille Douai, Institut Mines-Telecom, Univ. Lille, Centre for Energy and Environment, 59000 Lille, France. Institute of Chemical Process Fundamentals of the CAS, Department of Aerosols Chemistry and Physics, Prague CZ-16502, Czech Republic. Department of Atmospheric and Oceanic Sciences, McGill University, Montreal, Quebec H3A 0B9, Canada" |
DOI: | 10.1016/j.scitotenv.2022.153010 |
ISSN/ISBN: | 1879-1026 (Electronic) 0048-9697 (Linking) |
Abstract: | "The hygroscopic growth factor (GF) and cloud condensation nuclei (CCN) activity of secondary organic aerosol (SOA) particles produced during dark ozonolysis of gamma-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 (NH(4))(2)SO(4) 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 kappa was derived from both the GF and CCN measurements. Under subsaturated conditions, all the SOA (except those in the presence of the (NH(4))(2)SO(4) 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 kappa(GF)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 kappa(CCN) values (kappa(CCN) = 0.20-0.24) than those observed in most monoterpene ozonolysis studies (kappa(CCN) = 0.1-0.14). This difference may have been due to the presence of the two endocyclic double bonds in the gamma-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 kappa values than other experiments. Average kappa(CCN)/kappa(GF) ratios of ~7 and 14 were obtained in the unseeded SOA experiments at low and high SOA mass loadings, respectively. The average kappa(CCN) of 0.23 indicated that the SOA produced during ozonolysis of gamma-terpinene exhibited fairly high CCN activity" |
Keywords: | Aerosols/chemistry *Air Pollutants/chemistry Cyclohexane Monoterpenes *Ozone/chemistry *Volatile Organic Compounds/chemistry Wettability CCN activation Cloud droplet Hygroscopic growth Monoterpenes Soa gamma-Terpinene; |
Notes: | "MedlineBouzidi, Hichem Fayad, Layal Coeur, Cecile Houzel, Nicolas Petitprez, Denis Faccinetto, Alessandro Wu, Junteng Tomas, Alexandre Ondracek, Jakub Schwarz, Jaroslav Zdimal, Vladimir Zuend, Andreas eng Netherlands 2022/01/14 Sci Total Environ. 2022 Apr 15; 817:153010. doi: 10.1016/j.scitotenv.2022.153010. Epub 2022 Jan 11" |