Subpollen particles as atmospheric cloud condensation nuclei

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Abstract

Bioparticles represent a significant fraction of the total atmospheric aerosol. Their size range varies from nanometers (macromolecules) to hundreds of micrometers (plant pollen, vegetation residues) and like other atmospheric aerosol particles, the degree of involvement of bioaerosols in atmospheric processes largely de- pends on their hygroscopic and cloud condensation nuclei properties. In this paper the ability of the pine, birch and rape subpollen particles to act as cloud condensation nuclei are considered. Submicron particles were obtained by aqueous extraction of biological material from pollen grains and subsequent solidification of the atomized liquid droplets. The parameters of cloud activation are determined in the size range of 20-270 nm in the range of water vapor supersaturations 0.1-1.1%. Based on experimental results, the hygroscopicity parameter, characterizing the effect of the chemical composition of the subparticles on their con- densation properties, is determined. The range of the hygroscopic parameter changes was 0.12-0.13. In general, the results of measurements showed that the condensation activity of the subpollen particles is comparable with the condensation activity of secondary organic aerosols and weakly depends on the type of the primary pollen.

About the authors

E. F. Mikhailov

Saint Petersburg State University

Author for correspondence.
Email: eugene.mikhailov@spbu.ru
Russian Federation, Universitetskaya nab., 7/9, Saint Petersburg, 199034

O. A. Ivanova

Saint Petersburg State University

Email: eugene.mikhailov@spbu.ru
Russian Federation, Universitetskaya nab., 7/9, Saint Petersburg, 199034

E. Yu. Nebosko

Saint Petersburg State University

Email: eugene.mikhailov@spbu.ru
Russian Federation, Universitetskaya nab., 7/9, Saint Petersburg, 199034

S. S. Vlasenko

Saint Petersburg State University

Email: eugene.mikhailov@spbu.ru
Russian Federation, Universitetskaya nab., 7/9, Saint Petersburg, 199034

T. I. Ryshkevich

Saint Petersburg State University

Email: eugene.mikhailov@spbu.ru
Russian Federation, Universitetskaya nab., 7/9, Saint Petersburg, 199034

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