Aerosol particle formation events at two Siberian stations inside the boreal forest

We present one-year data on atmospheric aerosol particle size distributions covering the ultrafine size range from two measurement stations situated in central Siberia: Tomsk and Listvyanka. The size distributions were measured using Diffusion Aerosol Spectrometers (DAS), which are able to detect particles as small as 3 nm in diameter. The analysis of the size distribution time series revealed about 30 new-particle formation and growth events at both stations. The events occurred predominantly during the springtime. The average particle formation rates were 0.4 cm -3 s -1 at both stations, whereas the particle growth rates were on average 5.5 nm h -1 at Tomsk and 1.8 nm h -1 at Listvyanka. The formation and growth rates were comparable with those observed in the western part of the Eurasian boreal forest.