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. Secondary organic aerosol (SOA) is an important constituent of theatmosphere where SOA particles are formed chiefly by the condensation orreactive uptake of oxidation products of volatile organic compounds (VOCs).The mass yield in SOA particle formation, as well as the chemicalcomposition and volatility of the particles, is determined by the identityof the VOC precursor(s) and the oxidation conditions they experience. Inthis study, we used an oxidation flow reactor to generate biogenic SOA fromthe oxidation of Scots pine emissions. Mass yields, chemical compositionand volatility of the SOA particles were characterized and compared with SOAparticles formed from oxidation of α -pinene and from a mixture ofacyclic–monocyclic sesquiterpenes (farnesenes and bisabolenes), which aresignificant components of the Scots pine emissions. SOA mass yields forScots pine emissions dominated by farnesenes were lower than for α -pinene but higher than for the artificial mixture of farnesenes andbisabolenes. The reduction in the SOA yield in the farnesene- andbisabolene-dominated mixtures is due to exocyclic C = C bond scission inthese acyclic–monocyclic sesquiterpenes during ozonolysis leading to smallerand generally more volatile products. SOA particles from the oxidation ofScots pine emissions had similar or lower volatility than SOA particlesformed from either a single precursor or a simple mixture of VOCs. Applyingphysical stress to the Scots pine plants increased their monoterpene, especially monocyclic β -phellandrene, emissions, which further decreased SOA particle volatility and increased SOA mass yield. Our resultshighlight the need to account for the chemical complexity and structure ofreal-world biogenic VOC emissions and stress-induced changes to plantemissions when modelling SOA production and properties in the atmosphere.These results emphasize that a simple increase or decrease in relativemonoterpene and sesquiterpene emissions should not be used as an indicator ofSOA particle volatility.

atmospheric chemistry and physics

Composition and volatility of secondary organic aerosol (SOA) formed from oxidation of real tree emissions compared to simplified volatile organic compound (VOC) systems