Foto på Mikael Ehn
  • PL 64 (Gustaf Hällströmin katu 2)

    00014

    Finland

20052023
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Publikationer 2005 2019

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Konferensbidrag
2013

Identifying the chemical fingerprints of aerosol sources at a rural background site

Äijälä, M., Junninen, H., Ehn, M. K., Petaja, T., Kajos, M. K., Väänänen, R., Canonaco, F., Slovik, J., Prevot, A., Aalto, P. P., Kulmala, M. & Worsnop, D., 2013, Proceedings of FCoE in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Meeting 2013. s. 582-583 2 s. (Report Series in Aerosol Science; vol. Nro 142 (2013)).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Measurements of cluster composition in new particle formation from sulphuric acid, small bases, and oxidised organics

Schobesberger, S., Junninen, H., Franchin, A., Bianchi, F., Dommen, J., Donahue, N. M., Duplissy, J., Ehn, M. K., Lehtipalo, K., Lönn, G., Nieminen, T., Ortega Colomer, I. K., Sipilä, M. J., Petaja, T., Kulmala, M., Worsnop, D. & CLOUD Collaboration, 2013, Proceedings of FCoE in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Meeting 2013. s. 496-499 4 s. (Report Series in Aerosol Science; vol. Nro 142 (2013)).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Oxidation product study from three different monoterpenes

Jokinen, T., Berndt, T., Sipilä, M. J., Ehn, M. K., Junninen, H., Herrmann, H. & Kulmala, M., 2013, Proceedings of FCoE in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Meeting 2013. s. 254-256 3 s. (Report Series in Aerosol Science; vol. Nro 142 (2013)).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

2012

A method for assigning AMS measured nitrates and sulphates into molecular subgroups

Äijälä, M. Y. E., Junninen, H., Ehn, M. K., Häkkinen, S., Hong, J., Petaja, T., Aalto, P. P., Worsnop, D. & Kulmala, M., 2012, EAC 2012 Digital Abstracts Book.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Atmospheric amine measurements with CI-APi-TOF

Jokinen, T., Sipilä, M. J., Junninen, H., Ehn, M. K., Lönn, G., Hakala, J. P., Petäjä, T., Mauldin III, R., Kulmala, M. & Worsnop, D., 2012, EAC2012 digital abstract book. s. 1027 1 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Atmospheric Amine Measurements with CI-APi-TOF

Jokinen, T., Sipilä, M. J., Junninen, H., Ehn, M. K., Lönn, G., Hakala, J. P., Mauldin III, R., Petäjä, T., Kulmala, M. & Worsnop, D., 2012, AAAR abstracts 2012. s. 158 1 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Sulfuric acid and neutral cluster measurements with CI-APi-TOF

Jokinen, T., Sipilä, M. J., Junninen, H., Ehn, M. K., Hakala, J. P., Lönn, G., Petaja, T., Kulmala, M. & Worsnop, D., 2012, Proceedings of the Finnish Doctoral Programme in Atmospheric Composition and Climate Change ACCC Annual Meeting 9.–10.1.2012. Vol. 129. s. 26 1 s. (Report series in aerosol science; vol. 129).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

2011

Aerosol chemical composition measurements at a boreal forest site in Southern Finland during different seasons

Äijälä, M. Y. E., Junninen, H., Ehn, M. K., Petaja, T., Aalto, P. P., Kulmala, M. & Worsnop, D., 2011, Proceedings of the Finnish Center of Excellence and Graduate School in 'Physics, Chemistry, Biology and Meteorology ofAtmospheric Composition and Climate Change'. s. 429-431 3 s. (Report series in aerosol science; vol. 126).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

An overview of recent instrument development at University of Helsinki

Petäjä, T., Sipilä, M. J., Lehtipalo, K., Manninen, H. E., Junninen, H., Ruuskanen, T., Ehn, M. K., Vanhanen, J., Vehkamäki, H., Worsnop, D. & Kulmala, M., 2011, Proceedings of the Finnish Center of Excellence and Graduate School in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Workshop 18.–20.5.2011. s. 309-314 6 s. (Report series in aerosol science; vol. 126).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Measurements of ions and ion clusters by mass spectrometry during sulfuric acid-induced nucleation in the CLOUD chamber at CERN

Schobesberger, S., Franchin, A., Junninen, H., Ehn, M. K., Lehtipalo, K., Gagne, S., Nieminen, T., Petaja, T., Kulmala, M., Worsnop, D. & CLOUD Collaboration, 2011, Proceedings of the Finnish Center of Excellence and Graduate School in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Workshop 18.–20.5.2011. Kulmala, M., Bäck, J., Lappalainen, H. K. & Nieminen, T. (red.). Helsinki, s. 370-372 3 s. (Report Series in Aerosol Science; vol. 126).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Measurements of ions and ion clusters in the CLOUD chamber nucleation events by mass spectrometry

Schobesberger, S., Franchin, A., Junninen, H., Ehn, M. K., Lehtipalo, K., Nieminen, T., Gagne, S., Petaja, T. & Worsnop, D., 2011, Proceedings of the European Aerosol Conference 2011.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Physical and chemical characteristics of air ions during autumn 2010 in Hyytiälä, Finland

Nieminen, T., Junninen, H., Schobesberger, S., Lönn, G., Ehn, M. K., Petaja, T., Worsnop, D. & Kulmala, M., 2011, Proceedings of the Finnish Center of Excellence and Graduate School in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Workshop 18.–20.5.2011. s. 279-280 2 s. (Report series in aerosol science; vol. 126).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Plant emisissions and atmospheric nanoparticle formation

Dal Maso, M., Mentel, T., Kiendler-Scharr, A., Kleist, E., Mölgaard, B., Tilmann, R., Sipilä, M. J., Petäjä, T., Hakala, J. P., Liao, L., Lehtipalo, K., Junninen, H., Ehn, M. K., Vanhanen, J., Mikkilä, J., Kulmala, M., Wildt, J. & Worsnop, D., 2011, Proceedings of the Finnish Center of Excellence and Graduate School in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Workshop 18.–20.5.2011. s. 85-86 2 s. (Report series in aerosol science; vol. 126).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Seasonal variability of aerosol chemical composition in a boreal forest environment

Äijälä, M. Y. E., Junninen, H., Ehn, M. K., Petaja, T., Aalto, P. P., Worsnop, D. & Kulmala, M., 2011, 2011 AAAR Annual Conference Abstracts.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

2010

Aerosol chemical composition at a boreal forest site in Southern Finland, measured with an Aerosol Mass Spectrometer

Äijälä, M. Y. E., Ehn, M. K., Junninen, H., Petäjä, T., Aalto, P. P., Worsnop, D. & Kulmala, M., 29 aug 2010, 2010 Internatonal Aerosol Conference (IAC) Abstracts. 1 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Aerosol chemical composition measurements during the EUCAARI campaign at a boreal forest site in Southern Finland

Äijälä, M. Y. E., Ehn, M. K., Junninen, H., Petäjä, T., Aalto, P. P., Worsnop, D. & Kulmala, M., 22 nov 2010, Unknown host publication. 3 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Ambient small ion composition during new particle formation events measured with the APi-TOF

Ehn, M., Junninen, H., Petäjä, T., Kurtén, T., Kerminen, V-M., Schobesberger, S., Manninen, H. E., Ortega, I. K., Vehkamäki, H., Kulmala, M. & Worsnop, D. R., 2010, Proceedings of the Finnish Center of Excellence and Graduate School in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Workshop 17.-19.5.2010. Kulmala, M., J. B. & Nieminen, T. (red.). Helsinki, 3 s. (Report Series in Aerosol Science; nr. 109).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Anthropogenic monoterpene pollution episodes in a forest environment in association with aerosol particles

Liao, L., Taipale, R., Dal Maso, M., Ehn, M. K., Junninen, H., Nieminen, T., Kerminen, V-M. & Kulmala, M., 2010, 2010 AGU Fall Meeting.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Assessing the charging mechanism and charging probability in cluster experiments

Kurten, T. C., Vehkamäki, H., Petäjä, T., Ortega Colomer, I. K., Ehn, M. K., Junninen, H., Worsnop, D. & Kulmala, M., 2010, International Aerosol Conference 2010: abstract book. 1 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Formation and growth of atmospheric aerosols: cluster evaporation

Kulmala, M., Kurten, T. C., Vehkamäki, H., Petaja, T., Ortega Colomer, I. K., Ehn, M. K., Junninen, H., Nieminen, T., Lehtipalo, K., Riipinen, I., Manninen, H. E., Paasonen, P., Sipilä, M. J., Wilkman, O., Dal Maso, M., Worsnop, D. & Kerminen, V-M., 3 sep 2010, Conference proceedings of International Aerosol Conference 2010 .

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

High-resolution mass spectrometry revealing ion cluster chemistry during the first H2SO4 nucleation experiments at the CLOUD chamber

Schobesberger, S., Ehn, M. K., Junninen, H., Worsnop, D., Sipilä, M. J., Franchin, A., Petaja, T. & Kulmala, M., 2010, Proceedings of the International Aerosol Conference 2010.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Indirect aerosol chemical composition measurements with a VH-TDMA

Hakala, J., Mikkilä, J., Ehn, M., Siivola, E., Kulmala, M. & Petäjä, T., 2010, IAC 2010 Abstract Book. 1 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Laboratory studies of nanoparticle formation from sulphuric acid and biogenic organic compounds at atmospheric concentrations

Dal Maso, M., Mentel, T. F., KiendlerScharr, A., Kleist, E., Tillmann, R., Sipilä, M. J., Petaja, T., Hakala, J. P., Liao, L., Lehtipalo, K., Junninen, H., Ehn, M. K., Vanhanen, J., Mikkilä, J., Kulmala, M., Wildt, J. & Worsnop, D., 2010, Proceedings of the International Aerosol Conference 2010.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Monoterpene pollution episodes in a forest environment: indication of anthropogenic origin and association with aerosol particles

Liao, L., Dal Maso, M., Taipale, R., Rinne, J., Nieminen, T., Ehn, M. K., Junninen, H., Alekseychik, P., Hulkkonen, M., Kerminen, V-M. & Kulmala, M., 2010, 第17届中国大气环境科学与技术大会.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

The composition of ion clusters during sulfuric acid nucleation experiments at the CLOUD chamber

Schobesberger, S., Ehn, M. K., Junninen, H., Worsnop, D., Franchin, A., Gagne, S., Sipilä, M. J., Petaja, T. & Kulmala, M., 2010, EUCAARI annual meeting 2010.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Understanding new particle formation through ion cluster dynamics

Worsnop, D., Ehn, M. K., Junninen, H., Schobesberger, S., Franchin, A., Dal Maso, M., Sipilä, M. J., Petaja, T., Kurten, T. C., Ortega Colomer, I. K., Vehkamäki, H. & Kulmala, M., 2010, Proceedings of the International Aerosol Con- ference, Helsinki, Finland, 29.8-3.9.2010..

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

2009

Assessing the charging mechanism and charging probability in cluster experiments.

Kurten, T. C., Vehkamäki, H., Petäjä, T., Ortega Colomer, I. K., Ehn, M. K., Worsnop, D. & Kulmala, M., 2009, NOSA 2009 : proceedings. s. 48 1 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Measured ultrafine aerosol particle hygroscopic growth factors during particle formation and subsequent growth in Antarctica

Asmi, E., Virkkula, A., Ehn, M., Frey, A., Hillamo, R. & Kulmala, M., 2009, Proceedings of the Finnish Center of Excellence and Graduate School in 'Physics, Chemistry, Biology and Meteorology of Atmospheric Composition and Climate Change' Annual Workshop 27.-29.4.2009. Kulmala, M., Bäck, J., Nieminen, T. & Lauri, A. (red.). Helsinki: Finnish Association for Aerosol Research, s. 64-68 5 s. (Report series in aerosol science; nr. 102).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Molecular mechanisms behind nocturnal new particle formation

Ortega Colomer, I. K., Suni, T., Boy, M., Grönholm, T., Kulmala, M., Junninen, H., Ehn, M. K., Worsnop, D., Manninen, H. E., Vehkamäki, H., Hakola, H., Hellen, H., Valmari, T. & Arvela, H., nov 2009, Conference proceedings of European Aerosol Conference 2009.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Molecular Mechanisms Behind Nocturnal New Particle Formation

Ortega Colomer, I. K., Suni, T., Boy, M., Grönholm, T., Kulmala, M., Junninen, H., Ehn, M. K., Worsnop, D., Manninen, H. E. & Vehkamäki, H., 2009, Conference proceedings of International Conference on Nucleation and Atmospheric Aerosols 2009.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

2008

Chemical characterization of newly formed aerosol particles

Ehn, M., Petäjä, T., Aalto, P. P., Junninen, H., Worsnop, D., Kulmala, M. & Aalto, P., 2008, Proceedings of the Nordic Center of Excellence BACCI (Biosphere-Atmosphere-Cloud-Climate Interactions) and the Finnish Center of Excellence 'Research Unit on Physics, Chemistry and Biology of Atmospheric Composition Climate Chance' activities in 2002-2007 / editors: Markku Kulmala, Jaana Bäck and Martta Salonen. s. 16-20 5 s. (Report series in aerosol science; nr. 93).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Formation of secondary organic aerosols by ozonolysis of plant-released volatiles

Joutsensaari, J., Yli-Pirilä, P., Heijari, J., Pinto, D. M., Loivamäki, M., Vuorinen, T., Miettinen, P., Tiiva, P., Nerg, A-M., Raatikainen, T., Rautiainen, J., Kroll, J., Kajos, M. K., Ehn, M. K., Worsnop, D., Holopainen, J. K. & Laaksonen, A., 2008, Proceedings of the Nordic Center of Excellence BACCI (Biosphere-Atmosphere-Cloud-Climate Interactions) and the Finnish Center of Excellence 'Research Unit on Physics, Chemistry and Biology of Atmospheric Composition Climate Chance' activities in 2002-2007: Markku Kulmala, Jaana Bäck and Martta Salonen. Finnish Association for Aerosol Research, s. 61-66 6 s. (Report series in aerosol science; nr. 93).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

Improving particle detection efficiency of a condensation particle counter by means of pulse height analysis.

Sipilä, M. J., Aalto, P. P., Lihavainen, H., Vehkamäki, H., Ehn, M. K., Petaja, T. & Riipinen, I., 2008, Nucleation and Atmospheric Aerosols: Proceedings of the 17th International Conference on Nucleation and Atmospheric Aerosols ICNAA, 13.-17.8.2007, Galway, Ireland. Dowd, C. O. & Wagner, P. (red.). Springer, Vol. I. s. 378-381

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig

2007

Air ion measurements at Mace Head on the west coast of Ireland

Vana, M., Ehn, M., Petäjä, T., Vuollekoski, H., Aalto, P., Leeuw, G. D., Ceburnis, D., O'Dowd, C. D. & Kulmala, M., 2007, Nucleation and atmospheric aerosols. s. 373-377 5 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskapligPeer review

Improving particle detection efficiency of a condensation particle counter by means of pulse height analysis

Sipilä, M., Aalto, P., Lihavainen, H., Vehkamäki, H., Ehn, M., Petäjä, T., Riipinen, I., O'Dowd, C. D. & Kulmala, M., 2007, Nucleation and atmospheric aerosols. s. 378-381 4 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskapligPeer review

Marine aerosol and secondary particle formation over the North Atlantic

Ehn, M., Petäjä, T., Aalto, P., Kulmala, M., Leeuw, G. D. & O'Dowd, C. D., 2007, Nucleation and atmospheric aerosols. s. 1102-1105 4 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskapligPeer review

Measured neutral and charged aerosol particle number size distributions in Russia

Vartiainen, E., Kulmala, M., Ehn, M., Petäjä, T., Hirsikko, A., Junninen, A., Sogacheva, L., Kuokka, S., Hillamo, R., Skorokhod, A., Belikov, I., Elansky, N. & Kerminen, V-M., 2007, Nucleation and atmospheric aerosols. s. 659-663 5 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskapligPeer review

Size distributions, charging state, and hygroscopicity of aerosol particles in Antarctica

Vartiainen, E., Kulmala, M., Ehn, M., Aalto, P., Frey, A., Virkkula, A., Hillamo, R. & Arneth, A., 2007, Nucleation and atmospheric aerosols. s. 664-668 5 s.

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskapligPeer review

2006

Preliminary results of newly formed particles detected over the North Atlantic

Ehn, M., Petäjä, T. & Kulmala, M., 2006, NOSA 2006 Aerosol symposium, combined with the X Finnish National Aerosol Symposium, Finnish-Czech Aerosol Symposium, and BACCI workshop, Helsinki 8.-10.11.2006. Vehkamäki, H., Bergman, T., Julin, J., Salonen, M. & Kulmala, M. (red.). Helsinki, s. 69-72 4 s. (Report Series in Aerosol Science; vol. 83).

Forskningsoutput: Kapitel i bok/rapport/konferenshandlingKonferensbidragVetenskaplig