Springer TDMAndreas StohlAki VirkkulaM. MäkinenRisto Hillamo2025-06-202025-06-201995-01-010049-69791573-293210.1007/bf0118612710.1007/978-94-007-0864-8_21https://trapdev.rcub.bg.ac.rs/handle/123456789/1354222Atmospheric aerosols have been measured in Finnish Lapland from January 1992 to June 1994. A seasonal cycle in particle number concentration, measured using a condensation particle counter, is observed. Aerosol samples have been collected by a virtual impactor (VI) in two size ranges. The filters have been changed every 48 hours. Most fine particle samples are acidic: 91% of the measured anions (neq/m3) to measured cations (neq/m3) ratios are above one. According to a trajectory statistical analysis, high sulphate concentrations come to Finnish Lapland from all of continental Europe. The source areas of the highest observed ammonium concentrations are in Western Europe.CLOSEDpublication01 natural sciences0105 earth and related environmental sciences13. Climate actiondoi_dedup___:fe33122839c0a2af52226337f857ec8f