CV Hilkka Timonen

Hilkka Timonen

Title Senior Research Scientist


Postal address Finnish Meteorological Institute, PL 503, FIN-00101 Helsinki, Finland

Street address Erik Palménin aukio 1, Helsinki

Phone number +358-50-3802864

Fields of expertise

  • Atmospheric aerosols
  • Secondary aerosol formation
  • Organic aerosols, especially water-soluble organic fraction
  • Aerosol mass spectrometry
  • Emissions measurements


  • HIME - Particles and noise in sustainable mining environment
  • Controlling Emissions of Natural Gas Engines (CENGE)
  • Health relevant and energy efficient regulation of exhaust particle emissions (HERE)
  • Atmospheric Composition and Processes relevant to climate change in Antarctica (ACPANT)
  • Cluster for Energy and Environment (CLEEN Ltd) Measurement, Monitoring and Environmental Assessment (MMEA)

University and other degrees

  • Ph.D in physics, University of Helsinki 2011
  • M.Sc. in chemistry, University of Eastern Finland

Previous professional appointments

  • Post-doctoral scientist at University of Washington, USA, 2011 – 2013
  • Research scientist at Finnish Meteorological institute, Helsinki, Finland 2004 – 2011
  • Researcher at Disperse Technologies plc., UK, 2001-2002
  • Teaching assistant at University of Helsinki, 2000-2001

List of publications

 Peer-reviewed scientific articles

  1. Timonen, H., Aurela, M., Carbone, S., Saarnio, K., Frey, A., Saarikoski, S., Teinilä, K., Kulmala, M. and Hillamo, R. 2014, Seasonal and diurnal changes in inorganic ions, carbonaceous matter and mass in ambient aerosol particles at an urban, background area. Boreal Env. Res. 19 (suppl. B): 71–86.
  1. Timonen, H., D. A. Jaffe, N. Wigder, J. Hee, H. Gao, L. Pitzman, and R. A. Cary (2014), Sources of carbonaceous aerosol in the free troposphere, Atmos. Environ., 92, 146-153, doi:10.1016/j.atmosenv.2014.04.014.
  1. Saarnio K., Frey A., Niemi J.V., Timonen H., Rönkkö T., Karjalainen P., Vestenius M., Teinilä K., Pirjola L., Niemelä V., Keskinen J., Häyrinen A., and Hillamo R. (2014) Chemical composition and size of particles in emissions of a coal-fired power plant with flue gas desulfurization. J. Aerosol Sci., 73, 14-26, 10.1016/j.jaerosci.2014.03.004.
  1. Carbone S., Aurela M., Saarnio K., Saarikoski S., Timonen H., Frey A., Sueper D., Ulbrich I.M., Jimenez J.L., Kulmala M., Worsnop D.R. , Hillamo R.E. (2014), Wintertime Aerosol Chemistry in Sub-Arctic Urban Air, Aerosol Science and Technology, 48(3), 313-323, doi:10.1080/02786826.2013.875115.
  1. Timonen, H., Ambrose, J. L., and Jaffe, D. A.: Oxidation of elemental Hg in anthropogenic and marine airmasses, Atmos. Chem. Phys., 13, 2827-2836, doi:10.5194/acp-13-2827-2013, 2013.
  1. Timonen, H., Wigder, N., and Jaffe, D. A.: Influence of background particulate matter (PM) on urban air quality in the Pacific Northwest, J. Environ. Manage., 129, 333-340, 2013.
  1. Smith, D. J., Timonen, H.J., Jaffe, D.A., Griffin, D.W., Birmele, M.N., Perry, K.D., Ward, P.D., Roberts, M.S.: Intercontinental Dispersal of Bacteria and Archaea in Transpacific Winds. Appl. Environ. Microb., 79, 1134-1139, DOI:10.1128/AEM.03029-12, 2013.
  1. Timonen, H., Carbone, S., Aurela, M., Saarnio, K., Saarikoski, S., Ng., N.L., Canagaratna, M., Kulmala, M., Kerminen, V.-M., Worsnop, D., and Hillamo, R. 2013. Characteristics, sources and water-solubility of ambient submicron organic aerosol in springtime in Helsinki, Finland,  J. Aerosol Sci., 51, 61-77. j.jaerosci.2012.06.005.
  1. Kerminen, V.-M., Niemi, J. V., Timonen, H., Aurela, M., Frey, A., Carbone, S., Saarikoski, S., Teinilä, K., Hakkarainen, J., Tamminen, J., Vira, J., Prank, M., Sofiev, M., and Hillamo, R. 2011: Characterization of a volcanic ash episode in southern Finland caused by the Grimsvötn eruption in Iceland in May 2011, Atmos. Chem. Phys., 11, 12227-12239.
  1. Aurela, M., Saarikoski, S., Timonen, H., Aalto, P., Keronen, P., Saarnio, K., Teinilä, K., Kulmala, M. and Hillamo, R.. 2011: Carbonaceous aerosol at a forested and an urban background sites in Southern Finland, Atmos. Environ., Vol. 45, 7, 1394-1401.
  1. Timonen, H., Aurela, M., Carbone, S., Saarnio, K., Saarikoski, S., Mäkelä, T., Worsnop, D. R., Kulmala, M., Kerminen, V. -M. and Hillamo, R. 2010: Chemical characterization of the water-soluble fraction of ambient aerosols measured with two high-resolution devices PILS-TOC-IC and AMS, Atmos. Meas. Tech., 3, 1-12.
  1. Saarnio, K., Teinilä, K., Aurela, M., Timonen, H., Hillamo, R. (2010): High-performance anion-exchange chromatography–mass spectrometry method for determination of levoglucosan, mannosan, and galactosan in atmospheric fine particulate matter, Anal. Bioanal. Chem. 398, 2253-2264. DOI: 10.1007/s00216-010-4151-4.
  1. Saarnio, K., Aurela, M., Timonen, H., Saarikoski, S., Teinilä, K., Mäkelä, T., Sofiev, M., Koskinen, J., Aalto, P., Kulmala, M. and Hillamo R. 2010: Fine particles in fresh smoke plumes from boreal forest-fires, Sci. Tot. Environ., 408, 12,  2527-2542.
  1. Asmi, E., Frey, A., Virkkula, A., Ehn, M., Manninen, H. E., Timonen, H., Tolonen-Kivimäki, O., Aurela, M., Hillamo, R., and Kulmala, M. 2010: Hygroscopicity and chemical composition of Antarctic sub-micrometre aerosol particles and observations of new particle formation, Atmos. Chem. Phys., 10, 4253-4271.
  1. Frey, A. K., Tissari, J., Saarnio, K. M., Timonen, H. J., Tolonen-Kivimäki, O., Aurela, M. A., Saarikoski, S. K., Makkonen, U., Hytönen, K., Jokiniemi, J., Salonen, R. O. & Hillamo, R. E. J. 2009: Chemical composition and mass size distribution of fine particulate matter emitted by a small masonry heater, Boreal Env. Res. 14, 255–271.
  1. Timonen, H. J., Saarikoski, S. K., Aurela, M. A., Saarnio, K. M. and Hillamo, R. E. J. 2008: Water-soluble organic carbon in urban aerosol: concentrations, size distributions and contribution to particulate matter, Boreal Env. Res. 13, 335–346.
  1. Timonen, H., Saarikoski, S., Tolonen-Kivimäki, O., Aurela, M., Saarnio, K., Petäjä, T., Aalto, P.P., Kulmala, M., Pakkanen, T., and Hillamo, R. 2008: Size distributions, sources and source areas of water-soluble organic carbon in urban background air, Atmos. Chem. Phys., 8, 5635–5647.
  1. Saarikoski, S., Timonen, H., Saarnio, K., Aurela, M., Järvi, L., Keronen, P., Kerminen, V.-M., and Hillamo, R. 2008: Sources of organic carbon in fine particulate matter in northern European urban air, Atmos. Chem. Phys., 8, 6281-6295.
  1. Saarikoski, S., Sillanpää, M., Sofiev, M., Timonen, H., Saarnio, K., Teinilä, K., Karppinen, A., Kukkonen, J., Hillamo, R. 2007: Chemical composition of aerosols during a major biomass burning episode over northern Europe in spring 2006: Experimental and modeling assessments, Atmos. Environ. 41, 3577-3589.
  1. Holopainen, H., Alvila, L., Pakkanen T. T. 2003: Determination of the formaldehyde-to-phenol molar ratios of resol resins by infrared spectroscopy and multivariate analysis, J Appl Polym Sci, 89, 3582-3586.