K
Kari E. J. Lehtinen
Researcher at University of Eastern Finland
Publications - 286
Citations - 15137
Kari E. J. Lehtinen is an academic researcher from University of Eastern Finland. The author has contributed to research in topics: Aerosol & Nucleation. The author has an hindex of 56, co-authored 281 publications receiving 13774 citations. Previous affiliations of Kari E. J. Lehtinen include University of Minnesota & Finnish Geodetic Institute.
Papers
More filters
Journal ArticleDOI
Direct observations of atmospheric aerosol nucleation.
Markku Kulmala,Jenni Kontkanen,Heikki Junninen,Katrianne Lehtipalo,Hanna E. Manninen,Tuomo Nieminen,Tuomo Nieminen,Tuukka Petäjä,Mikko Sipilä,Siegfried Schobesberger,Pekka Rantala,Alessandro Franchin,Tuija Jokinen,Emma Järvinen,Mikko Äijälä,Juha Kangasluoma,Jani Hakala,P. P. Aalto,Pauli Paasonen,Jyri Mikkilä,Joonas Vanhanen,Juho Aalto,Hannele Hakola,Ulla Makkonen,Taina Ruuskanen,Roy L. Mauldin,Roy L. Mauldin,Jonathan Duplissy,Hanna Vehkamäki,Jaana Bäck,Aki Kortelainen,Ilona Riipinen,Theo Kurtén,Murray V. Johnston,James N. Smith,James N. Smith,Mikael Ehn,Mikael Ehn,Thomas F. Mentel,Kari E. J. Lehtinen,Kari E. J. Lehtinen,Ari Laaksonen,Ari Laaksonen,Veli-Matti Kerminen,Douglas R. Worsnop +44 more
TL;DR: Three separate size regimes below 2-nm diameter are identified that build up a physically, chemically, and dynamically consistent framework on atmospheric nucleation—more specifically, aerosol formation via neutral pathways.
Journal Article
Formation and growth of fresh atmospheric aerosols: eight years of aerosol size distribution data from SMEAR II, Hyytiälä, Finland
Miikka Dal Maso,Markku Kulmala,Ilona Riipinen,Robert Wagner,Tareq Hussein,Pasi Aalto,Kari E. J. Lehtinen +6 more
TL;DR: In this paper, the authors analyzed size distributions measured continuously at a boreal forest measurement site at Hyytiala, Finland between 1996 and 2003 and identified days when new aerosol particle formation was taking place as well as days when no formation was detected, removing days with ambiguous status.
Journal ArticleDOI
An improved parameterization for sulfuric acid-water nucleation rates for tropospheric and stratospheric conditions
Hanna Vehkamäki,Markku Kulmala,Ismo Napari,Kari E. J. Lehtinen,Claudia Timmreck,Madis Noppel,Madis Noppel,Ari Laaksonen +7 more
TL;DR: In this paper, the authors presented parameterized equations for calculation of sulfuric acid-water critical nucleus compositions, critical cluster radii and homogeneous nucleation rates for tropospheric and stratospheric conditions.
Journal ArticleDOI
Toward direct measurement of atmospheric nucleation.
Markku Kulmala,Ilona Riipinen,Mikko Sipilä,Hanna E. Manninen,Tuukka Petäjä,Heikki Junninen,Miikka Dal Maso,Genrik Mordas,Aadu Mirme,Marko Vana,Marko Vana,Anne Hirsikko,Lauri Laakso,Roy M. Harrison,Ian Hanson,Carl Leung,Kari E. J. Lehtinen,Veli-Matti Kerminen +17 more
TL;DR: An instrumental setup to measure atmospheric concentrations of both neutral and charged nanometer-sized clusters concludes that a pool of numerous neutral clusters in the sub–3 nanometer size range is continuously present and neutral nucleation dominates over the ion-induced mechanism, at least in boreal forest conditions.
Journal ArticleDOI
Cluster activation theory as an explanation of the linear dependence between formation rate of 3nm particles and sulphuric acid concentration
TL;DR: In this paper, the authors present an activation theory, which can explain the observed slope of particle formation, which predicts that the critical cluster contains one to two sulphuric acid molecules.