Preprints
https://doi.org/10.5194/acp-2021-530
https://doi.org/10.5194/acp-2021-530

  01 Sep 2021

01 Sep 2021

Review status: this preprint is currently under review for the journal ACP.

Occurrence of new particle formation events in Siberian and Finnish boreal forest

Helmi Uusitalo1, Jenni Kontkanen1, Ilona Ylivinkka1,2, Ekaterina Ezhova1, Anastasiia Demakova1, Mikhail Arshinov3, Boris Denisovich Belan3, Denis Davydov3, Nan Ma4, Tuukka Petäjä1, Alfred Wiedensohler5, Markku Kulmala1,6,7, and Tuomo Nieminen1,8 Helmi Uusitalo et al.
  • 1Institute for Atmospheric and Earth System Research (INAR)/Physics, Faculty of Science, University of Helsinki, Finland
  • 2Station for Measuring Ecosystem - Atmosphere Relations II (SMEAR II), University of Helsinki, Korkeakoski, Finland
  • 3V. E. Zuev Institute of Atmospheric Optics, SB RAS, Tomsk, Russia
  • 4Institute for Environmental and Climate Research, Jinan University, Guangzhou, China
  • 5Leibniz Institute for Tropospheric Research, Leipzig, Germany
  • 6Aerosol and Haze Laboratory, Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, China
  • 7Joint International Research Laboratory of Atmospheric and Earth System Sciences, Nanjing University, Nanjing, China
  • 8Institute for Atmospheric and Earth System Research (INAR)/Forest Sciences, Faculty of Agriculture and Forestry, University of Helsinki, Finland

Abstract. The occurence of new particle formation (NPF) events was investigated at four sites in the boreal forest environment (Hyytiälä SMEAR II and Värriö SMEAR I in Finland; Tomsk-Fonovaya and ZOTTO in Siberia, Russia), by analyzing measured particle number size-distributions (PNSD) and theoretical calculations of particle survival probabilities. NPF events were less frequent at the Siberian sites than at the Finnish sites. This is likely linked to lower survival probabilities of the freshly-formed particles at the Siberian sites, due to higher coagulational losses and lower particle growth rates. Another factor affecting the frequency of observed NPF events is the minimum detectable particle size. When the NPF event classification was made for Hyytiälä, Värriö and Tomsk-Fonovaya sites based on PNSD starting from 15 nm instead of 3 nm, the observed NPF frequencies decreased. This result highlights the importance of measuring PNSD starting from sub-10 nm particles, in order to obtain reliable estimates of the NPF characteristics.

Helmi Uusitalo et al.

Status: open (until 13 Oct 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Helmi Uusitalo et al.

Helmi Uusitalo et al.

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Short summary
Characteristics of formation of atmospheric aerosol at four boreal forest sites in Finland and Russian Siberia was analyzed. Our results provide information on the governing processes of atmospheric aerosol formation in the boreal forest area, which a substantial part of the continental biosphere. Aerosol formation was occurring less frequently at Siberian than in Finnish sites, which was affected by the lower particle growth rates and higher loss rates in Siberia.
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