Biogenic organic compounds as a vertically distributed source of atmospheric aerosol over the forests of West Siberia
T.A. Maksimova1, A.A. Maskaeva2,3, G.G. Dultseva1,4, S.N. Dubtsov1
1V.V. Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the RAS, 3 Institutskaya str., 3, 630090, Novosibirsk, Russia
2V.V. Voevodsky Institute of Chemical Kinetics and Combustion of the Siberian Branch of the RAS, 20, K. Marksa av., Novosibirsk, 630073, Russia
3Novosibirsk State Technical University
4Novosibirsk State University, 2, Pirogova Str., Novosibirsk, 630090, Russia
Keywords: atmospheric organic aerosol, aldehydes, photonucleation
Abstract
Results of airborne measurements of aldehyde concentrations above forests of West Siberia are presented. A chemical model describing the mechanism of formation of aldehydes and solid nuclei in the course of oxidation of biogenic isoprene is constructed. It is demonstrated that the detected episodes with high (up to 9 mg/m3) formaldehyde concentration are due to the photooxidation of hydrocarbons, which act as a vertically-distributed source of aldehydes and aerosol.
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