Journal article

Nanoparticles in boreal forest and coastal environment: a comparison of observations and implications of the nucleation mechanism

Lehtipalo K, Kulmala M, Sipilä M, Petäjä T, Vana M, Ceburnis D, Dupuy R, O'Dowd C ...see all

Atmospheric Chemistry and Physics, vol. 10, issue 15 (2010) pp. 7009-7016

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The detailed mechanism of secondary new particle formation in the atmosphere is still under debate. It is proposed that particle formation happens via activation of 1-2 nm atmospheric neutral molecular clusters and/or large molecules. Since traditional instrumentation does not reach these sizes, the hypothesis has not yet been verified. By directly measuring particle size distributions down to mobility diameters of about 1.3 nm with a pulse-height CPC, we provide evidence of the nucleation mechanism in a coastal environment (Mace Head, Ireland) and in a boreal forest (Hyytiala, Finland). In both places neutral sub-3 nm condensation nuclei (nano-CN) were continuously present, even when no new particle formation was detected. In Mace Head, however, the concentration of the nano-CN was far too low to account for the particle formation rates during particle bursts. Thus the results imply that at coastal sites new particle formation initiates, as previously proposed, via homogenous nucleation from biogenic iodine vapors. In contrast, activation of preexisting nano-CN remains a possible explanation in the boreal forest, but the observed concentrations are not the limiting factor for the particle formation events.

Author-supplied keywords

  • aerosol formation
  • air ion spectrometer
  • atmospheric sulfuric-acid
  • growth-rates
  • mediated nucleation
  • mode particles
  • particle formation events
  • size distribution
  • smear-ii
  • tropospheric aerosols

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  • K Lehtipalo

  • M Kulmala

  • M Sipilä

  • T Petäjä

  • M Vana

  • D Ceburnis

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