Atmos. Chem. Phys. Discuss., 13, 33311-33342, 2013
© Author(s) 2013. This work is distributed
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Temperature influence on the natural aerosol budget over boreal forests
L. Liao1, V.-M. Kerminen1, M. Boy1, M. Kulmala1, and M. Dal Maso2
1Department of Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland
2Department of Physics, Tampere University of Technology, P.O. Box 692, 33101, Tampere, Finland

Abstract. We investigated the natural aerosol evolution from biogenic monoterpene emissions among northern boreal forest area as function of temperature, using long-term field measurements of aerosol size distributions and back trajectories at two stations SMEAR I and SMEAR II in Finland. Particles were formed via nucleation through the clean ocean to land transition of air parcels, and continuously grew to larger sizes during air mass transport. Both the travelling hour over land and temperature influences the evolution of the particle number size distribution and the average aerosol mass yield from BVOC emissions. Average concentrations of nucleation mode particles were higher at lower temperatures, whereas the opposite was true for accumulation mode particles, thus more CCN may be formed at higher temperature. The overall apparent aerosol yield derived from the aerosol masses against accumulated monoterpene emissions ranges 13–37% with a minor yet complicating temperature dependence.

Citation: Liao, L., Kerminen, V.-M., Boy, M., Kulmala, M., and Dal Maso, M.: Temperature influence on the natural aerosol budget over boreal forests, Atmos. Chem. Phys. Discuss., 13, 33311-33342, doi:10.5194/acpd-13-33311-2013, 2013.
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