Aare Luts

Scopus Publications

COMPARISON OF GROWTH RATE CALCULATION METHODS FOR ATMOSPHERIC ULTRAFINE PARTICLE FORMATION MODELS
22nd International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes Harmo 2024, 2024
Links between the concentrations of gaseous pollutants measured in different regions of Estonia
Aare Luts, Marko Kaasik, Urmas Hõrrak, Marek Maasikmets, Heikki Junninen
Air Quality Atmosphere and Health, 2023
Links between the concentrations of gaseous pollutants measured in different regions of Estonia
20th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes Harmo 2020, 2020
Interpretation of atmospheric aerosol measurements by means of a numerical simulator of new particle formation events
Aare Luts, Urmas Hõrrak, Jaan Salm, Marko Vana, Hannes Tammet
Aerosol and Air Quality Research, 2016
We performed a more comprehensive test of a new NPF parameter estimator published recently. The estimator considers measurements as test data and automatically adjusts the values of its physical control parameters according to the criterion of best fit. The parameters estimated within this procedure include nucleation rate, particle growth rate, birth size of nanoparticles etc. We analyzed all new particle formation events recorded during a measurement campaign at Hyytiälä, Finland. The results show a good performance in reproducing the time series of the concentrations of small air ions and aerosol nanoparticles in the diameter interval of 2.8–8.6 nm. The numerically estimated values of the parameters are in accordance with the results known from certain other studies carried out at Hyytiälä. We conclude the new method may appear useful in the analysis of several air ion and atmospheric aerosol measurements during new particle formation events.
A method for automated estimation of parameters controlling aerosol new particle formation
Aare Luts, Urmas Hõrrak, Jaan Salm, Marko Vana, Hannes Tammet
Aerosol and Air Quality Research, 2015
We use a previously published simulator of aerosol new particle formation (NPF) events as the core component of the new method for automated estimation of its input parameters. The simulator has a large number of physical input parameters (e.g., nucleation and growth rates), and it yields results about the dynamics of particle concentrations and their size distributions as its output. Our new method automatically solves the inverse problem. It estimates the physical input parameters by recurrent simulations according to the criterion of best fit of the simulated output parameters with the known data. The method is implemented as a computer program that includes the previous simulator as a subroutine. The method enables the estimation of several physical parameters, e.g., the nucleation rate, particle growth rate, contribution from ion-induced and neutral nucleation, and particle charging state. The program was tested using the results of two NPF events measured at Hyytiälä, Finland. The measured time series of the concentration of atmospheric ions and nanoparticles in the diameter interval of 2.8–8.6 nm were well reproduced by our method. The estimated values of the analyzed input parameters are in agreement with the results known from many other studies carried out at Hyytiälä. The proposed method of inverse simulator may appear useful in the analysis and interpretation of air ion and atmospheric aerosol measurements during new particle formation events.
Problem of ionization rate in the research of atmospheric aerosols
International Conference on Atmospheric Electricity Icae 2014, 2014
Links between two different types of spectra of charged nanometer aerosol particles
A. Luts, K. Komsaare, T.-E. Parts, U. Hõrrak
Atmospheric Research, 2011
Composition of negative air ions as a function of ion age and selected trace gases: Mass- and mobility distribution
Aare Luts, Tiia-Ene Parts, Urmas Hõrrak, Heikki Junninen, Markku Kulmala
Journal of Aerosol Science, 2011
Some air electricity phenomena caused by waterfalls: Correlative study of the spectra
Aare Luts, Tiia-Ene Parts, Lauri Laakso, Anne Hirsikko, Tiia Grönholm, Markku Kulmala
Atmospheric Research, 2009
Chemical composition of waterfall-induced air ions: Spectrometry vs. simulations
Boreal Environment Research, 2007
Waterfalls as sources of small charged aerosol particles
L. Laakso, A. Hirsikko, T. Grönholm, M. Kulmala, A. Luts, T.-E. Parts
Atmospheric Chemistry and Physics, 2007
New aerosol particle formation via certain ion driven processes
A. Luts, T.-E. Parts, M. Vana
Atmospheric Research, 2006
Observed and simulated effects of certain pollutants on small air ion spectra: I. Positive ions
Tiia-Ene Parts, Aare Luts
Atmospheric Environment, 2004
Effect of sulfuric acid on the composition of negative small air ions: A numerical simulation
A. LUTS, M. NOPPEL, H. VEHKAMÄKI
Journal of Aerosol Science, 2004
Evolution of negative small air ions at two different temperatures
Aare Luts, Tiia Parts
Journal of Atmospheric and Solar Terrestrial Physics, 2002
One-second small ions - Modeling and laboratory experiments
Tiia-Ene Parts, Aare Luts
Journal of Aerosol Science, 2000
Temperature variation of the evolution of positive small air ions at constant relative humidity
Aare Luts
Journal of Atmospheric and Solar Terrestrial Physics, 1998
Evolution of negative small ions at enhanced ionization
Aare Luts
Journal of Geophysical Research, 1995
Chemical composition of small atmospheric ions near the ground
A. Luts, J. Salm
Journal of Geophysical Research, 1994
Mobility spectrum of air ions at Tahkuse Observatory
U. Hõrrak, H. Iher, A. Luts, J. Salm, H. Tammet
Journal of Geophysical Research, 1994

Aare Luts

RESEARCH INTERESTS

Scopus Publications