Publications of Lauri Laakso

            (September 2008 – August 2009 visiting professor in Aerosol Physics in the North-West University, Republic of South Africa)

PhD-thesis

Lauri Laakso, "Kinetics and dynamics of atmospheric ions, clusters and aerosols", Published in Report Series in Aerosol Science 70 Department of Physics, University of Helsinki, 2004. Eximia cum laude approbatur (Full version including all articles is available on request).

Masters thesis

Lauri Laakso, "Ilmakehän ionien ja aerosolien mallintaminen" Department of Physics, University of Helsinki, 1999

Publications in peer reviewed international journals

(If you have an electronic access to the corresponding journals, click the links below, otherwise send email to Lauri Laakso)

 

1.       L. Laakso, H. Laakso, P.P. Aalto, P. Keronen, T. Petäjä, T. Nieminen, T. Pohja, E. Siivola, M. Kulmala, N. Kgabi, D. Phalatse, M. Molefe, D. Mabaso, K. Pienaar, V.-M. Kerminen, ” Basic characteristics of atmospheric particles, trace gases and meteorology in a relatively clean Southern African Savannah environment”, Atm. Chem. Phys., 8, 4823-4839, 2008

2.       Gagné, S., L. Laakso, T. Petäjä, V.-M. Kerminen and M. Kulmala, “Analysis of one year of Ion-DMPS data from SMEAR II station, Finland”, Tellus B, 60, 318-329, 2008

3.       M. Kulmala, I. Riipinen, M. Sipilä, H. E. Manninen, T. Petäjä, H. Junninen, M. Dal Maso, G. Mordas, A. Mirme, M. Vana, A. Hirsikko, L. Laakso, Roy M. Harrison, Ian Hanson, Carl Leung, Kari E. J. Lehtinen, and Veli-Matti Kerminen, “Towards Direct Measurement of Atmospheric Nucleation” , Science, 10.1126/science.1144124, 2007

4.       T. Suni, M. Kulmala, A. Hirsikko, T. Bergman, L. Laakso, P. P. Aalto, R. Leuning, H. Cleugh, S. Zegelin, D. Hughes, E. van Gorsel, M. Kitchen, M. Vana, U. Hõrrak, S. Mirme, A. Mirme, J. Twining, and C. Tadros, “Formation and characteristics of ions and charged aerosol particles in a native Australian Eucalypt forest”, Atmos. Chem. Phys., 8, 129-139, 2008

5.       V.-M. Kerminen, T. Anttila, T. Petäjä, L. Laakso, S. Gagné, K. E. J. Lehtinen and M. Kulmala,  “Charging state of the atmospheric nucleation mode: implications for separating neutral and ion-induced nucleation”, Journal of Geophysical Research, Vol.112, doi:10.1029/2007JD008649, 2007

6.       B. Bonn, A. Hirsikko, H. Hakola, T. Kurtén, L. Laakso, M. Boy, M. Dal Maso, J. M. Mäkelä, and M. Kulmala, ”Ambient sesquiterpene concentration and its link to air ion measurements”, Atmospheric Physics and Chemistry,  2893-2916. SRef-ID: 1680-7324/acp/2007-7-2893, 2007

7.       T.-E. Parts, A. Luts,  L. Laakso, A. Hirsikko, T. Grönholm, M. Kulmala, ”Simulation results of air ion chemical composition near waterfalls”, Boreal Env. Res. 12: 409–420, 2007

8.       A. Mirme,  E. Tamm, G. Mordas, M. Vana, J. Uin, S. Mirme, T. Bernotas, L. Laakso, A. Hirsikko and M. Kulmala, “A wide range multi-channel Air Ion Spectrometer”, Boreal Env. Res. 12: 247–264, 2007

9.       A. Hirsikko, T. Yli-Juuti, T. Nieminen, E. Vartiainen, L. Laakso, T. Hussein and M. Kulmala, “Indoor and outdoor air ions and aerosol particles in the urban atmosphere of Helsinki: characteristics, sources and formation”, Boreal Env. Res. 12: 311–321, 2007

10.   L. Laakso, T. Grönholm, L. Kulmala, S. Haapanala, A. Hirsikko, E. R. Lovejoy, J.  Kazil, T. Kurtén, M. Boy, E.D. Nilsson,  A. Sogachev, I. Riipinen, F. Stratmann and M. Kulmala, “Hot-air balloon measurements of vertical variation of boundary layer new particle formation”, Boreal Env. Res. 12: 279–294, 2007

11.   M. Komppula, M. Vana, V.-M. Kerminen, H. Lihavainen, Y. Viisanen, U. Hõrrak, K. Komsaare, E. Tamm, A. Hirsikko, L. Laakso and M. Kulmala, “Size distributions of atmospheric ions in Baltic Sea region”, Boreal Env. Res. 12: 323–336, 2007

12.   Haapanala, S. , Rinne, J., Hakola, H., Hellén, H., Laakso, L., Lihavainen, H., Janson, R. and Kulmala, M., “Boundary layer concentrations and landscape scale emissions of volatile organic compounds in early spring”, Atmos. Chem. Phys., 7, 1869-1878, 2007

13.   L. Laakso, A. Hirsikko, T. Grönholm, A. Luts, T.-E. Parts and M. Kulmala, ”Waterfalls as sources of small charged aerosol particles”, Atmospheric Chemistry and Physics, 7, p. 1333–1345, 2007

14.   A. Hirsikko, T. Bergman, L. Laakso, M. Dal Maso, I. Riipinen, U. Hõrrak and M. Kulmala, ” Identification and classification of the formation of intermediate ions measured in Boreal Forest”, Atmospheric Chemistry and Physics 7, 201–210, 2007

15.   Grönholm, T., Hiltunen, V., Aalto, P., Laakso, L., Rinne, J., Hyvänen, S., Rannik, Ü and Kulmala, M., ”Measurements of aerosol particle dry deposition velocities using relaxed eddy accumulation technique”. Tellus, 59, p. 381-386, 2007

16.   L. Laakso, S. Gagné, T. Petäjä, A. Hirsikko, P. P. Aalto, M. Kulmala, V.-M Kerminen, “Detecting charging state of ultra-fine particles: instrumental development and ambient measurements”, Atmos. Chem. Phys., 7, 1333–1345, 2007

17.   Andronache, C., Grönholm, T., Laakso, L., Phillips, V., and Venäläinen, A., “Ultrafine particle scavenging by rainfall at a boreal site: observations and model estimations”, Atmos. Chem. Phys., 6, 4739-4754, 2006

18.   Tammet, H., Hõrrak, U., Laakso, L., Kulmala. M., ” Factors of air ion balance in a coniferous forest according to measurements in Hyytiälä, Finland”, Atmos. Chem. Phys., 7, 201–210, 2007

19.  L. Laakso, Ismo K. Koponen, Petteri Mönkkönen and Markku Kulmala, Veli-Matti Kerminen, Birgit Wehner, Alfred Wiedensohler, Zhijun Wu, Min Hu, “Aerosol particles in the developing world; a comparison between New Delhi in India and Beijing in China”, Water, Air and Soil Pollution, pages 5-20, DOI 10.1007/s11270-005-9018-5, 2006

20.  Hyvönen, S. , Junninen, H., Laakso, L., Dal Maso, M., Grönholm, T., Bonn, B., Keronen, P., Aalto, P., Hiltunen, V., Pohja, T., Launiainen, S., Hari, P., Mannila, H. and Kulmala, M., A look at aerosol formation using data mining techniques, Atmospheric Chemistry and Physics Discussions, Vol. 5, pp 7577-7611, 2005

21.  M. Vana, E. Tamm, U. Hõrrak, A. Mirme, H. Tammet, L. Laakso, P. P. Aalto, M. Kulmala, Charging state of atmospheric nanoparticles during the nucleation burst events, accepted to Journal of Atmospheric Research, 2005

22.  Anne Hirsikko, Lauri Laakso, Urmas Hõrrak, Pasi P. Aalto, Veli-Matti Kerminen and Markku Kulmala, Annual and size dependent variation of growth rates and ion concentrations in boreal forest, accepted to Boreal Environment research, 2005

23.  J. V. Niemi, H. Tervahattu, H. Vehkamäki, J. Martikainen, L. Laakso, M. Kulmala, P. Aarnio, T. Koskentalo, M. Sillanpää, U. Makkonen, "Characterization of aerosol particle episodes in Finland caused by wildfires in Eastern Europe", ACP-D,Vol. 5, pages 2469-2501, 2005

24.  U. Hörrak, P.P. Aalto, J. Salm, J.M. Mäkelä, L. Laakso and M. Kulmala, "Characterization of air ions in boreal forest air during BIOFOR III campaign", Accepted to ACP-D, 2005

25.  Markku Kulmala, Kari E.J. Lehtinen, Lauri Laakso, Genrik Mordas and Kaarle Hämeri, "On the existence of neutral atmospheric clusters", Boreal Environment Research, Vol 10., Pages 79-87, 2005

26.  M. Kulmala, L. Laakso, K. E. J. Lehtinen, I. Riipinen, M. Dal Maso, T. Anttila, V.-M. Kerminen, U. Hörrak, M. Vana, and H. Tammet, "Initial steps of aerosol growth", ACP, Page(s) 2553-2560. SRef-ID: 1680-7324/acp/2004-4-2553, 2004

27.  Lauri Laakso, T. Anttila, K. E. J. Lehtinen, P. P. Aalto, M. Kulmala, U. Hõrrak, J. Paatero, M. Hanke, F. Arnold "Kinetic nucleation and ions in boreal particle formation events", ACP, Page(s) 2353-2366. SRef-ID: 1680-7324/acp/2004-4-2353, 2004

28.  Lauri Laakso, Tuukka Petäjä, Kari E. J. Lehtinen, Jussi Paatero, Markku Kulmala, Urmas Hörrak, Hannes Tammet and Jorma Joutsensaari "Ion production rate in a boreal forest based on ion, particle and radiation measurements", ACP, Page(s) 1933-1943. SRef-ID: 1680-7324/acp/2004-4-1933, 2004.

29.  Taina Ruuskanen, Anni Reissell, Petri Keronen, Pasi P. Aalto, Lauri Laakso, Tiia Grönholm, Pertti Hari, Markku Kulmala "Atmospheric trace gas and aerosol concentration measurements in Eastern Lapland, Finland 1992-2001", (2003), Boreal Environmental Research, Vol 8, pages 335–349.

30.  Lauri Laakso and Markku Kulmala, "The effect of condensation rate enhancement factor on 3-nm particle formation in binary ion-induced and homogeneous nucleation", (2003), Journal of Geophysical Research, Vol. 108, No. D18, 4574, 10.1029/2003JD003432

31.  Lauri Laakso , Tiia Grönholm, Üllar Rannik, Hanna Vehkamäki, Miriam Kosmale, Verena Fiedler and Markku Kulmala, Ultrafine particle scavenging coefficients calculated from six years field measurements (2003), Atmospheric Environment, Vol 37, pages 3605-3613. Correction to the article.

32.  Lauri Laakso , Tareq Hussein, Päivi Aarnio, Mika Komppula, Veijo Hiltunen, Yrjö Viisanen and Markku Kulmala, "Diurnal and annual characteristics of particle mass and number concentrations in urban, rural and Arctic environments in Finland" (2003) Atmospheric Environment, (2003), Vol. 37, No 9, pages 2629-2641.

33.  Lauri Laakso , J. M. Mäkelä, L. Pirjola and M. Kulmala, "Model studies on ion-induced nucleation in the atmosphere" (2002) J. Geophys. Research , 10.1029/2002JD002140

34.  Markku Kulmala, Pekka Korhonen, Lauri Laakso and Liisa Pirjola, "Nucleation in boreal forest boundary layer", Environmental and chemical physics (2000) Vol 22, pp. 46-53

35.  Markku Kulmala, Kaarle Hämeri, Jyrki M. Mäkelä, Pasi P. Aalto, Liisa Pirjola, Ismo K. Koponen, Petri Keronen, Ullar Rannik, Lauri Laakso, Timo Vesala, "Biogenic aerosol formation in the boreal forest" (2000) Boreal Environment Research Vol 5, No 4, pages 281-297

36.  Veli-Matti Kerminen, Liisa Pirjola, Michael Boy, Arkke Eskola, Kimmo Teinilä, Lauri Laakso, Ari Asmi, Jukka Hienola, Antti Lauri, Veera Vainio, Kari Lehtinen and Markku Kulmala, "Interaction between SO2 and submicron particles" Atmospheric Research 54 (2000) 41-57

37.  Jyrki M. Mäkelä, Miikka Dal Maso, Liisa Pirjola, Petri Keronen, Lauri Laakso, Markku Kulmala, Ari Laaksonen, "Characterization of the atmospheric particle formation events observed at a boreal forest site in southern Finland" (2000) Boreal Environment Research Vol 5, No 4, pages 299-313

Main conference presentations/publications

  1. Staroverova A., Boy M., Pimenoff N., Grönholm T., Laakso L., Sipilä M., Guenther A., Vesala T., Sogachev A. and Kulmala M., Aerosol particle concentration measurements in the boundary layer, Report Series in Aerosol Science 97, p 79, 2008
  2. Grönholm T., Laakso L., Haapanala S., Hirsikko A., Kurtén T., Boy M., Sogachev A., Riipinen I., Kulmala M., Kulmala L., Lovejoy E.R., Kazil J., Nilsson D. and Stratmann F, Hot-air balloon measurements of atmospheric ions and particles during new particle formation events, Report Series in Aerosol Science 97, p 19, 2008
  3. Gagné S., Laakso L., Kerminen V.-M., Petäjä T. and Kulmala M. Ion-DMPS: ion-induced nucleation and cluster activation, Report Series in Aerosol Science 97, p. 18, 2008
  4. Leppä J., Kerminen V.-M., Laakso L., Korhonen H., Lehtinen K.E.J., Junninen H. and Kulmala M., First aerosol dynamics simulations with the model Ion-UHMA, Report Series in Aerosol Science 93, p. 121-126, 2008
  5. Laakso L., Kgabi N., Phalatse D., Molefe M., Mabaso D., Pienaar K., Kulmala M., Aalto P.P., Keronen P., Petäjä T., Nieminen T., Laakso H., Pohja T. and Siivola E., Air pollution and meteorology in a relatively clean Southern African savannah environment, Report Series in Aerosol Science 93, p. 103-106, 2008
  6. Gagne S., Petäjä T., Laakso L., Anttila T., Kerminen V.-M., Aalto P.P. and
  7. Kulmala M., “Ion-DMPS: A novel tool for measuring the charging state of aerosols”, Report Series in Aerosol Science 93, p. 21-27, 2008
  8. Haapanala S., Rinne J., Hakola H., Hellén H., Laakso L., Lihavainen H., Janson R., O'Dowd C., and Kulmala M., “Boundary layer concentrations and landscape scale emissions of volatile organic compounds in early spring”, Report Series in Aerosol Science 92, p. 73-79, 2008
  9. L. Laakso, H. Laakso, M. Kulmala, N. Kgabi, M. Molefe, D. Mabaso, K. Pienaar and M. Jokinen, “New particle formation in a clean and polluted Southern African savannah”, Proceedings of IGBP meeting, Cape Town, 2008
  10. L. Laakso, T. Petäjä, H. Laakso, P.P. Aalto, E. Siivola, P. Keronen, S. Haapanala, M. Kulmala, H. Hakola, N. Kgabi, M. Molefe, D. Mabaso, K. Pienaar, and E. Sjöberg, Air quality in background savannah in Southern Africa, Proceedings of EAC2007, http://www.gaef.de/EAC2007/, Salzburg, 2007
  11. L. Laakso, T. Grönholm, S. Haapanala, A. Hirsikko, T. Kurtén, M. Boy, A. Sogachev, I. Riipinen, M. Kulmala, L. Kulmala, E.R. Lovejoy, J. Kazil, D. Nilsson, and F. Stratmann, Hot-air balloon measurements of vertical variation of boundary layer new particle formation, Proceedings of EAC2007, http://www.gaef.de/EAC2007/, Salzburg, 2007
  12. T. Nieminen, M. Kulmala, I. Riipinen, M. Boy and L. Laakso, Comparison of H2SO4 concentrations and new particle formation during 26 months in Hyytiälä, Finland, Proceedings of EAC2007, http://www.gaef.de/EAC2007/, Salzburg, 2007
  13. T. Suni, M. Kulmala, L. Sogacheva, A. Hirsikko, T. Bergman, P. Aalto, M. Vana, U. Horrak, A. Mirme, S. Mirme, L. Laakso, M. Dal Maso, R. LEuning, H. Cleugh, S. Zegelin, D. Hughes, R. Hurley, E. Van Gorsel, M. Kitchen, M. Keywood, J. Ward, H. HAkola, J. Bäck, C. Tadros, J. Twining and J. Paatero, “Ions and charged aerosol particles in a native Australian Eucalypt forest”, Proceedings of  17th ICNAA, p. 902-905, Galway, Ireland, 2007, Nucleation and atmospheric aerosols, eds. C.O. Dowd and P. Wagner, Springer.
  14. L. Laakso, T. Petäjä, H. Laakso, P.P. Aalto, E. Siivola, P. Keronen, S. Haapanala, M. Kulmala, H. Hakola, N. Kgabi, M. Molefe, D. Mabaso, K. Pienaar, E. Sjöberg and M. Jokinen, ”New particle formation in clean savannah environment”, Proceedings of  17th ICNAA, p. 694-697, Galway, Ireland, 2007, Nucleation and atmospheric aerosols, eds. C.O. Dowd and P. Wagner, Springer.
  15. S. Gagne, L. Laakso, T. Petäjä, V.-M. Kerminen, P.A. Aalto, M. Kulmala, ”Measurement of the charging state with an ion-DMPS to estimate the contribution of ion-induced nucleation”,  Proceedings of  17th ICNAA, p. 397-401, Galway, Ireland, 2007, Nucleation and atmospheric aerosols, eds. C.O. Dowd and P. Wagner, Springer.
  16. V.-M. Kerminen, T. Anttila, T. Petäjä, L. Laakso, S. Gagné, K.E.J. Lehtinen, and M. Kulmala, Using charging state in estimating the relative importance of neutral and ion-induced nucleation”, Proceedings of  17th ICNAA, p. 350-353, Galway, Ireland, 2007, Nucleation and atmospheric aerosols, eds. C.O. Dowd and P. Wagner, Springer.
  17. B. Bonn, M. Boy, M. Dal Maso, H. Hakola, A. Hirsikko, M. Kulmala, T. Kurtén, L. Laakso, J. Mäkelä, I. Riipinen, Ü. Rannik, S.-L. Sihto, T. Ruuskanen, “Biogenic Sesquiterpens and atmospheric new particle formation: a boreal forest site study”, Proceedings of  17th ICNAA, p. 345-349, Galway, Ireland, 2007, Nucleation and atmospheric aerosols, eds. C.O. Dowd and P. Wagner, Springer.
  18. T. Nieminen, M. Kulmala, I. Riipinen, A. Hirsikko, M. Boy and L. Laakso, ”New particle formation and sulphuric acid concentrations during 26 months in Hyytiälä”, Proceedings of  17th ICNAA, p. 226-229, Galway, Ireland, 2007, Nucleation and atmospheric aerosols, eds. C.O. Dowd and P. Wagner, Springer.
  19. Stephanie Gagné, Tuukka Petäjä, Lauri Laakso, Veli-Matti Kerminen, Pasi P. Aalto and Markku Kulmala, “Investigating ion-induced nucleation with the ion-DMPS”, The second Ny-Ålesund-Pallas-Sodankylä atmospheric research workshop, Ny-Ålesund, Svalbard, Norway, 16-18 April 2007, eds. Kim Holmén and Jussi Paatero, Norsk-Polar Institut, Kortrapport/Brief Report Series nr. 08, p 42-43, 2007
  20. L. Laakso, A. Hirsikko, M, Dal Maso, V.-M. Kerminen, P. P. Aalto and M. Kulmala, “Contribution of ion-induced nucleation on tropospheric nucleation; quantitative results” Proceedings of IAC 2006, Minneapolis, USA, 2006
  21. L. Laakso, M. Kulmala, T. Pohja, E. Siivola, H. Laakso, P. P. Aalto, T. Petäjä, P. Keronen, N. Kgabi, K. Piennaar, C. Read, M. Molefe, A. Bubu, A. Van Heerden, E. Kleynhans, E. Sjöberg, A mobile laboratory for long-term air pollution measurements in Southern Africa Proceedings of IGAC, Cape Town, 2006
  22. U. Hõrrak, H. Tammet, P.P. Aalto, M. Vana, A. Hirsikko, L. Laakso and M. Kulmala, ”Formation of Charged Nanometer Aerosol Particles Associated With Rainfall: Atmospheric Measurements and Lab Experiment”, Proceedings of BACCI, NECC and FCoE activities 2005, Report Series in Aerosol Science 80A, p. 180-185, 2006
  23. A. Hirsikko, T. Bergman, L. Laakso, M. Dal Maso, I. Riipinen, U. Hõrrak and M. Kulmala, “Observations of Charged Aerosol Particles in Boreal Forest during 21 Months”, Proceedings of BACCI, NECC and FCoE activities 2005, Report Series in Aerosol Science 80A, p. 176-179, 2006
  24. S. Gagné, L. Laakso, T. Petäjä, A. Hirsikko, P.P. Aalto and M. Kulmala, ”Determination of the Charging State of Ultra-Fine Particles during a Nucleation Event”, Proceedings of BACCI, NECC and FCoE activities 2005, Report Series in Aerosol Science 80A, p. 133-136 2006
  25. T. Grönholm, L. Laakso, A. Hirsikko, A. Luts, T-E. Parts and M. Kulmala, “Waterfall as a Source of Small Charged Aerosol Particles”, Proceedings of BACCI, NECC and FCoE activities 2005, Report Series in Aerosol Science 80A, p. 133-136 2006
  26. Hirsikko, A., Laakso, L., Bergman, T., Petäjä, T., Gagne, S., Vana, M., Hõrrak, U., Aalto, P., Mirme, A., Tammet, H. and Kulmala, M., ” Air ion and aerosol particle measurements and the formation of new particles”, Formation and Growth of Secondary Atmospheric Aerosols, A joint ACCENT-BACCI-iLEAPS-IGAC-SOLAS workshop, Report Series in Aerosol Science 80, 2006
  27. M. Kulmala, S-L. Sihto, M. Dal Maso, I. Riipinen, A. Hirsikko, L. Laakso, M. Boy, T. Petäjä, K. Hämeri, T. Suni, A. Reissell, P. Hari, V.-M- Kerminen, K. Lehtinen, Y. Viisanen, A. Laaksonen and T. Vesala, ”Biosphere-Atmosphere interactions: formqation and growth of atmospheric aerosols”, Proceedings of 1st iLEAPS Science Conference, Boulder, USA, Report Series in Aerosol Science 79, p. 152-153, 2006
  28. T. Grönholm, V. Hiltunen, L. Laakso, Ü. Rannik, P. Aalto, T. Vesala and M. Kulmala, Measurements of aerosol particle dry deposition velocities using relaxed eddy accumulation technique, Proceedings of 1st iLEAPS Science Conference, Boulder, USA, Report Series in Aerosol Science 79, p. 251-252, 2006
  29. L. Laakso, A. Hirsikko, M. Dal Maso, V.-M. Kerminen, M. Vana and M. Kulmala, “Contribution of ion-induced nucleation on particle formation in the lower Troposphere”, Proceedings of EAC2005, Gent, Belgium, 2005
  30. U. Hõrrak, H. Tammet, P.P. Aalto, M. Vana, A. Hirsikko, L. Laakso and M. Kulmala, “Formation of charged nanometer aerosol particles associated with rainfall”, Proceedings of EAC2005, Gent, Belgium, 2005
  31. C. Andronache, T. Grönholm, L. Laakso and V. Phillips, “Aerosol removal during precipitation: model and observations”, Proceedings of EAC2005, Gent, Belgium, 2005
  32. A. Hirsikko, L. Laakso, U. Hõrrak, P.P. Aalto and M. Kulmala, ”Growth rates of aerosol particles and ions in boreal forest”, Proceedings of EAC2005, Gent, Belgium, 2005
  33. A. Hirsikko, L. Laakso, U. Hõrrak, P.P. Aalto and M. Kulmala, "Growth Rates of Air Ions and Particles at Smear II", Report Series in Aerosol Science 73, p. 84, FcofEx, Finland, 2005
  34. U. Hõrrak, P.P. Aalto, J. Salm, M. Vana, A. Hirsikko, L. Laakso and M. Kulmala, "Estimation of the Ionization Rate from Air Ion and Aerosol Particle Measurements at Boreal Forest", Report Series in Aerosol Science 73, p. 91, FcofEx, Finland, 2005
  35. Lauri Laakso, Anne Hirsikko, Miikka Dal Maso, Veli-Matti Kerminen, Marko Vana and Markku Kulmala, "Effect of Ion-Induced Nucleation on Particle Formation in Boreal Forests", Report Series in Aerosol Science 73, p. 146, FcofEx, Finland, 2005
  36. A. Hirsikko, L. Laakso, U. Hõrrak, P. Aalto and M. Kulmala Observations of Air Ion and Particle Measurements at SMEAR II, Report series in aerosol science 71, p. 181, Bacci-meeting, Sweden, Lund,  2005
  37. U. Hõrrak, H. Tammet, P.P. Aalto, L. Laakso and M. Kulmala "Study of Air Ions and Nanometer Particles in the Atmosphere during Nucleation Burst Events", Report Series in Aerosol Science 71, p. 184, Sweden, Lund, 2005
  38. M. Kulmala, K.E.J. Lehtinen, L. Laakso, T. Anttila, T. Suni, M. Dal Maso, I. Napari, H. Vehkamäki, H. Korhonen, V.-M. Kerminen, U. Hõrrak, P. Tunveed, H.-C. Hansson, D. E. Nilsson, A. Grini, P. Hari, "How Particles Nucleate and Grow", Report Series in Aerosol Science 71, p. 283, Sweden, Lund, 2005
  39. L. Laakso, T. Anttila, K.E.J. Lehtinen, U. Hõrrak and M. Kulmala, "Kinetic Nucleation and Ions in Boreal Forests", Report Series in Aerosol Science 71, p. 286, Sweden, Lund, 2005
  40. Kulmala, M.; Laakso, L.; Vehkamäki, H.; Lehtinen, K.E.J, "How particles nucleate and grow", Proceedings of  EAC2004, Budapest, Hungary, 2004
  41. K. Lehtinen, M. Dal Maso, I. Riipinen, L. Laakso, I.. Napari, M. Vana  and M. Kulmala, Features of nucleation events and non-events observed during the QUEST campaign in Hyytiälä, Finland, Proceedings of  EAC2004, Budapest, Hungary, 2004
  42. K. E. J. Lehtinen, M. Dal Maso, L. Laakso, I. Riipinen, T. Anttila, I. Napari, V.-M. Kerminen, and M. Kulmala, Particle Formation during the QUEST Campaign in Hyytiälä, Finland: Analyses of Nucleation and Condensational Growth Rates,  XVI  ICNAA, Kyoto, Japan, 2004
  43. I. Napari, H. Vehkamäki, M. Kulmala, K. E. J. Lehtinen, and L. Laakso, Kinetic Limits and Nucleation Regimes in Water-Sulphuric Acid-Ammonia Nucleation, XVI  ICNAA, Kyoto, Japan, 2004
  44. K. Plauskaite, L. Laakso, K. E. J. Lehtinen, V. Ulevicius, and M. Kulmala, New Particle Formation and Growth in the Boundary Layer: A Comparison Coastal Zone and Boreal Forest Case, XVI  ICNAA, Kyoto, Japan, 2004
  45. L. Laakso, T. Anttila, K. E. J. Lehtinen, U. Hõrrak, and M. Kulmala, Kinetic Nucleation and Ions in Boreal Forests,  XVI  ICNAA, Kyoto, Japan, 2004
  46. Kulmala, M.; Laakso, L.; Vehkamäki, H.; Lehtinen, K.E.J, ”How particles nucleate and grow”, proceeding of EGS, 2004
  47. Lehtinen, K.E.J; Laakso, L.; Riipinen, I.; Anttila, T.; Dal Maso, M.; Korhonen, H.; Kerminen, V.-M.; Kulmala, M.  “Model studies and parameterisations of the initial steps of particle growth”, proceeding of EGS, 2004
  48. Laakso, L.; Lehtinen, K.E.J; Kulmala, M., Kinetic nucleation and ions in boreal particle formation events, proceeding of EGS, 2004
  49. Laakso, L., Hõrrak, U., Paatero, J., Petäjä, T., Tammet, H., Joutsensaari, J., Lehtinen, K.E.J. and Kulmala, M., “Ion production rate and atmospheric conductivity in boreal forest based on ion, particle and radiation measurements”, Report Series in Aerosol Science 67, 2004
  50. Paatero, J., Laakso, L., Hatakka, J., Lihavainen, H., Kulmala, M. and Viisanen, Y., “UIon production rate in the ground-level air in Hyytiälä, Finland during the QUEST-2 campaing in 2003”, Report Series in Aerosol Science 68, 2004
  51. Lehtinen, K.E.J., Dal Maso, M., Laakso, L., Riipinen, I., Anttila, T., Napari, I., Korhonen, H., Sihto, S-L., Vana, M., Hõrrak, U., Kerminen, V-M., Kulmala, M., “Analyses on particle formation and growth during the QUEST campaign”, Report Series in Aerosol Science 68, 2004
  52. Laakso, L. Anttila, T., Lehtinen, K.E.J., Hõrrak, U., Paatero, J. and Kulmala, M., “Kinetic nucleation and ions in boreal forest”, Report Series in Aerosol Science 68, Helsinki, 2004
  53. Lehtinen, Kari E. J.; Korhonen, Hannele; Anttila, Tatu, Laakso, Lauri ; Dal Maso, Miikka; Riipinen, Ilona and Kulmala, Markku "Studies on the Initial Steps of Particle Growth", (2003), Proceedings of the NOSA aerosol symposium, p. 29-30, Copenhagen, Denmark, November 13-14, 2003
  54. Kulmala, M., Napari, I., Merikanto, J., Vehkamäki, H., Laakso, L., Lehtinen, K. E. J., Noppel, M., Laaksonen, A. "Homogeneous and ion induced nucleation: kinetic and thermodynamic nucleation regimes ", Proceedings of EAC2003, Madrid, Spain, 2003
  55. L. Laakso and M. Kulmala "Condensation rate enhancement in binary ion-induced and homogeneous nucleation", Proceedings of EAC2003, Madrid, Spain, 2003
  56. L. Laakso, T. Hussein, P. Aarnio, M. Komppula, V. Hiltunen, Y. Viisanen and M. Kulmala "Particle mass and number concentrations in Finland (1999-2001)", Proceedings of EAC2003, Madrid, Spain, 2003
  57. T. Grönholm, L. Laakso, U. Rannik, H. Vehkamäki, M. Kosmale, V. Fiedler and M.Kulmala "Ultrafine particle scavenging coefficients calculated from the field measurements" Proceedings of EAC2003, Madrid, Spain, 2003
  58. L. Laakso, T. Hussein, P. Aarnio, M. Komppula, V. Hiltunen, Y. Viisanen and M. Kulmala "Three years of particle mass and number concentration measurements in urban and rural environments in Finland", Proceedings of the XXXVII Annual Conference of the Finnish Physical Society, Helsinki, Finland, 2003
  59. L. Laakso, T. Grönholm, U. Rannik, H. Vehkamäki, M. Kosmale, V. Fiedler and M.Kulmala "Ultrafine particle scavenging coefficients calculated from six years field measurements" Report series in Aerosol Science 59, Hyytiälä, Finland, 2003
  60. L. Laakso, T. Hussein, P. Aarnio, M. Komppula, V. Hiltunen, Y. Viisanen and M. Kulmala "Three years of particle mass and number concentration measurements in urban and rural environments in Finland", Report series in Aerosol Science 59, Hyytiälä, Finland, 2003
  61. T. Ruuskanen, A. Reissell, P. Keronen, P.P. Aalto, L. Laakso, T. Grönholm, P. Hari and M.Kulmala "Atmospheric trace gas and aerosol concentration measurements in Eastern Lapland, Finland 1992-2001" Report series in Aerosol Science 59, Hyytiälä, Finland, 2003
  62. L. Laakso, J.M. Mäkelä, L. Pirjola and M. Kulmala "Ion-induced nucleation in the atmosphere", Proceedings of the XVII International Conference for Physics Students, Budapest, Hungary, CD-proceedings, 2002
  63. L. Laakso, J.M. Mäkelä, L. Pirjola and M. Kulmala "Model studies in ion-induced nucleation", 12th General conference of the European Physical Society EPS-12 Trends in Physics, Budapest, Hungary, Europhysics conference abstracts 26G, pp. 223, 2002
  64. L. Laakso, J.M. Mäkelä, L. Pirjola and M. Kulmala "Model studies on ion-induced nucleation in the atmosphere", NorFa-course, Preila, Lithuania, 6.-12.8.2002
  65. L. Laakso, J.M. Mäkelä, L. Pirjola and M. Kulmala "Model studies on ion-induced nucleation in the atmosphere", Czech-Finnish aerosol symposium, Report Series in Aerosol Science 56, pp. 101-105, Prague 23.5.-26.5.2002
  66. M. Johansson, N. Karvosenoja, L. Laakso and L. Kangas, "Particulate matter in Finland - integrated modelling project", The VIII Finnish National Aerosol Symposium, Helsinki, 20. -21.8. 2001
  67. Lauri Laakso, Jyrki M. Mäkelä and Markku Kulmala, "The characteristic time scales of condensation and coagulation in ion-induced nucleation", Nucleation and atmospheric aerosols 2000, AIP conference proceedings 534, Rolla, Missouri, 2000
  68. Lauri Laakso, Jyrki M. Mäkelä and Markku Kulmala, "Model studies on atmospheric aerosol charge distribution", Journal of Aerosol Science, Vol. 30, S1, pages 675-676 Praha, 1999
  69. J.M. Mäkelä, K. Hämeri, M. Väkevä, P. Aalto, L. Laakso, M. Kulmala ja R.J. Charlson: "On the spatial scale of the new aerosol particle formation in Southern Finland", abstracts of the 5th international aerosol conference, Journal of Aerosol Science 29: S215, Edinburgh, 1998
  70. L. Laakso: "Sunspots and the climate of the Earth", Proceedings of the XIV International Conference for Physics Students, Report Series In Physics HU-P-263, 1999
  71. Jyrki Mäkelä, Jarkko Augustin, Lauri Laakso ja Jyrki Juhanoja: "Generation of 30 nm silver nanoparticles by standard evaporation/condensation technique", Properties of nuclear particles and release of radionuclides from carrier matrix, Report Series in Aerosol Science 39, 1998

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  10. Matti Johansson, Niko Karvosenoja, Lauri Laakso, L. Kangas: ”Hiukkasten kokonaismallintamisesta tukea tutkimukselle ja päätöksenteolle”, Ilmansuojelulehti, 3/2001
  11. Lauri Laakso, ”Helsingin yliopiston fysiikan laitos uudelle vuosituhannelle”, Arkhimedes 1/2001
  12. Lauri Laakso, ”Fysiikan opiskelijoiden konferenssi onnistui hyvin”. Arkhimedes 4/99
  13. Lauri Laakso, ”Kansainvälinen fysiikan opiskelijoiden konferenssi Suomeen”, Tekniikan Akateemiset 3/99