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Hygroscopicity, CCN and volatility properties of submicron atmospheric aerosol in a boreal forest environment during the summer of 2010

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  • J. Hong, University of Helsinki, Denmark
  • S. A. K. Häkkinen, University of Helsinki, Columbia University, Unknown
  • M. Paramonov, University of Helsinki, Unknown
  • M. Äijälä, University of Helsinki, Unknown
  • J. Hakala, University of Helsinki, Finland
  • T. Nieminen, University of Helsinki, Finland
  • J. Mikkilä, AirModus OY, Unknown
  • N. L. Prisle, University of Helsinki, Finland
  • M. Kulmala, University of Helsinki, Finland
  • I. Riipinen, Stockholm University, Sweden
  • M. Bilde
  • V. -M. Kerminen, University of Helsinki, Finland
  • T. Petäjä, University of Helsinki, Finland
A Volatility-Hygroscopicity Tandem Differential Mobility Analyzer (VH-TDMA) was applied to study the hygroscopicity and volatility properties of submicron atmospheric aerosol particles in a boreal forest environment in Hyytiala, Finland during the summer of 2010. Aitken and accumulation mode internally mixed particles (50 nm, 75 nm and 110 nm in diameter) were investigated. Hygroscopicity was found to increase with particle size. The relative mass fraction of organics and SO42- is probably the major contributor to the fluctuation of the hygroscopicity for all particle sizes. The Cloud Condensation Nuclei Counter (CCNC)-derived hygroscopicity parameter kappa was observed to be slightly higher than kappa calculated from VH-TDMA data under sub-saturated conditions, potential reasons for this behavior are discussed shortly. Also, the size-resolved volatility properties of particles were investigated. Upon heating, more small particles evaporated compared to large particles. There was a significant amount of aerosol volume (non-volatile material) left, even at heating temperatures of 280 degrees C. Using size resolved volatility-hygroscopicity analysis, we concluded that there was always hygroscopic material remaining in the particles at different heating temperatures, even at 280 degrees C. This indicates that the observed non-volatile aerosol material did not consist solely of black carbon.
Original languageEnglish
JournalAtmospheric Chemistry and Physics
Volume14
Issue9
Pages (from-to)4733-4748
Number of pages16
ISSN1680-7316
DOIs
Publication statusPublished - 2014

    Research areas

  • CLOUD CONDENSATION NUCLEI, SECONDARY ORGANIC AEROSOL, SIZE-RESOLVED MEASUREMENTS, DROPLET ACTIVATION, MASS-SPECTROMETER, SULFURIC-ACID, AMMONIUM-SULFATE, PARTICLES, GROWTH, TDMA

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