New-particle formation, growth and climate-relevant particle production in Egbert, Canada: analysis from 1 year of size-distribution observations

摘要: Abstract. Aerosol particle nucleation, or new-particle formation, is the dominant contributor to number in atmosphere. However, these particles must grow through condensation of low-volatility vapors without coagulating with larger, preexisting order reach climate-relevant sizes (diameters larger than 50–100 nm), where may affect clouds and radiation. In this paper, we use 1 year size-distribution measurements from Egbert, Ontario, Canada calculate frequency regional-scale new-particle-formation events, rates, growth rates fraction new that survive sizes. Regional-scale events occur on 14–31% days (depending stringency classification criteria), event peaking spring fall. New-particle-formation are similar those measured at other midlatitude continental sites. We roughly half (with diameters nm) Egbert formed events. With addition meteorological SO2 measurements, find formation often occurs under synoptic conditions associated high surface pressure large-scale subsidence cause sunny clean-air flow north west. also when air flows polluted regions south southwest Egbert. The tend be faster during south/southwest conditions.