TY - T1 - Intermediate ions as a strong indicator of new particle formation bursts in a boreal forest SN - / UR - http://hdl.handle.net/10138/165318 T3 - A1 - Leino, Katri; Nieminen, Tuomo; Manninen, Hanna E.; Petäjä, Tuukka; Kerminen, Veli-Matti; Kulmala, Markku A2 - PB - Y1 - 2016 LA - eng AB - Secondary aerosol formation from gas-phase precursors is a frequent phenomenon occurring in a boreal environment. Traditionally, this process is identified visually from observational data on total and ion number size distributions. Here, we introduce a new, objective classification method for the new particle formation events based on measured intermediate-ion concentrations. The intermediate-ion concentration is a suitable indicator of new particle formation, because it is linked to the atmosp... VO - IS - SP - OP - KW - AEROSOL-SIZE DISTRIBUTIONS; ATMOSPHERIC IONS; FORMATION EVENTS; GROWTH-RATES; SMEAR-II; NUCLEATION; AIR; SPECTROMETER; MOBILITY; CLUSTERS; 114 Physical sciences; 1172 Environmental sciences N1 - PP - ER -