T
Tuukka Petäjä
Researcher at University of Helsinki
Publications - 620
Citations - 38508
Tuukka Petäjä is an academic researcher from University of Helsinki. The author has contributed to research in topics: Aerosol & Particle. The author has an hindex of 82, co-authored 526 publications receiving 30572 citations. Previous affiliations of Tuukka Petäjä include Helsinki Institute of Physics & National Center for Atmospheric Research.
Papers
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Journal ArticleDOI
On the growth of nucleation mode particles: source rates of condensable vapor in polluted and clean environments
Markku Kulmala,Tuukka Petäjä,P. Mönkkönen,Ismo K. Koponen,M. Dal Maso,Pasi Aalto,Kari E. J. Lehtinen,V.-M. Kerminen +7 more
TL;DR: In this paper, the growth properties of nucleation mode aerosols were investigated and the variation of source rates of condensable vapors in different locations and environmental conditions was analyzed, taking advantage of only the measured spectral evolution of aerosol particles as a function of time.
Journal ArticleDOI
Gas phase formation of extremely oxidized pinene reaction products in chamber and ambient air
Mikael Ehn,Einhard Kleist,Heikki Junninen,Tuukka Petäjä,Gustaf Lönn,Siegfried Schobesberger,M. Dal Maso,A. Trimborn,Markku Kulmala,D. R. Worsnop,Andreas Wahner,Jürgen Wildt,Th. F. Mentel +12 more
TL;DR: In this paper, high molecular weight (300-650 Da) naturally charged negative ions have previously been observed at a boreal forest site in Hyytiala, Finland and were identified as clusters of the nitrate ion (NO3−) and α-pinene oxidation products reaching oxygen to carbon ratios of 0.7-1.3, while retaining most of the initial ten carbon atoms.
Journal ArticleDOI
The role of VOC oxidation products in continental new particle formation
Ari Laaksonen,Ari Laaksonen,Markku Kulmala,Colin D. O'Dowd,Jorma Joutsensaari,Petri Vaattovaara,Santtu Mikkonen,Kari E. J. Lehtinen,Kari E. J. Lehtinen,Larisa Sogacheva,M. Dal Maso,Pasi Aalto,Tuukka Petäjä,A. Sogachev,Young Jun Yoon,Heikki Lihavainen,Douglas Nilsson,Maria Cristina Facchini,Fabrizia Cavalli,Sandro Fuzzi,Thorsten Hoffmann,Frank Arnold,M. Hanke,Karine Sellegri,Karine Sellegri,B. Umann,W. Junkermann,Hugh Coe,James Allan,M. R. Alfarra,M. R. Alfarra,D. R. Worsnop,M.-L. Riekkola,Tuulia Hyötyläinen,Y. Viisanen +34 more
TL;DR: In this article, the role of oxidation products of VOC's such as mono-and sesquiterpenes in atmospheric nucleation events was investigated using the Tandem Differential Mobility Analyzer results.
Journal ArticleDOI
Laboratory study on new particle formation from the reaction OH + SO 2 : influence of experimental conditions, H 2 O vapour, NH 3 and the amine tert-butylamine on the overall process
Torsten Berndt,Frank Stratmann,Mikko Sipilä,Mikko Sipilä,Mikko Sipilä,Joonas Vanhanen,Tuukka Petäjä,Jyri Mikkilä,Achim Grüner,Gerald Spindler,R. Lee Mauldin,Joachim Curtius,Markku Kulmala,Jost Heintzenberg +13 more
TL;DR: In this article, a parameterization of the experimental data was developed using power law equations for H2SO4 and H2O vapour, and it was shown that amines can strongly influence NH3-H2O nucleation and particle growth.
Journal Article
Evaluation of an automatic algorithm for fitting the particle number size distributions
Tareq Hussein,Miikka Dal Maso,Tuukka Petäjä,Ismo K. Koponen,Pentti Paatero,Pasi Aalto,Kaarle Hämeri,Markku Kulmala +7 more
TL;DR: An algorithm to parameterize aerosol particle number size distributions with the multi log-normal distribution function is developed and evaluated and showed the following advantages: it is suitable for different types of aerosol particles observed in different environments and conditions, it showed agreement with the previous standard algorithm in about 90% of long-term data set, it is not time-consuming, particularly when long- term data sets are analyzed.