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Factors controlling the evaporation of secondary organic aerosol from α-pinene ozonolysis. 2017

Taina Yli-Juuti, and Aki Pajunoja, and Olli-Pekka Tikkanen, and Angela Buchholz, and Celia Faiola, and Olli Väisänen, and Liqing Hao, and Eetu Kari, and Otso Peräkylä, and Olga Garmash, and Manabu Shiraiwa, and Mikael Ehn, and Kari Lehtinen, and Annele Virtanen
Department of Applied Physics University of Eastern Finland Kuopio Finland.

Secondary organic aerosols (SOA) forms a major fraction of organic aerosols in the atmosphere. Knowledge of SOA properties that affect their dynamics in the atmosphere is needed for improving climate models. By combining experimental and modeling techniques, we investigated the factors controlling SOA evaporation under different humidity conditions. Our experiments support the conclusion of particle phase diffusivity limiting the evaporation under dry conditions. Viscosity of particles at dry conditions was estimated to increase several orders of magnitude during evaporation, up to 109 Pa s. However, at atmospherically relevant relative humidity and time scales, our results show that diffusion limitations may have a minor effect on evaporation of the studied α-pinene SOA particles. Based on previous studies and our model simulations, we suggest that, in warm environments dominated by biogenic emissions, the major uncertainty in models describing the SOA particle evaporation is related to the volatility of SOA constituents.

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