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. Combustion and other high-temperature processes frequently resultin the emission of aerosols in the form of polydisperse fractal-likeaggregates made of condensed-phase nanoparticles (soot for instance). Ifcertain conditions are met, the emitted aerosol particles are known toevolve into important cloud condensation nuclei (CCN) in the atmosphere. Inthis work, the hygroscopic parameter κ of complex morphologyaggregates is calculated from the supersaturation-dependent activatedfraction Fa=Fa(SS) in the frame of κ-Köhler theory. The particle size distribution is approximated with themorphology-corrected volume equivalent diameter calculated from theelectrical mobility diameter by taking into account the diameter of theprimary particle and the fractal dimension of the aggregate experimentallyobtained from transmission electron microscopy measurements. Activationexperiments are performed in water supersaturation conditions using acommercial CCN-100 condensation nuclei counter. The model is tested inclose-to-ideal conditions of size-selected, isolated sphericalparticles (ammonium sulfate nanoparticles dispersed in nitrogen), then withcomplex polydisperse fractal-like aggregates (soot particles activated byexposure to ozone with κ as low as 5×10-5) thatrepresent realistic anthropogenic emissions in the atmosphere.

atmospheric chemistry and physics

Influence of the dry aerosol particle size distribution and morphology on the cloud condensation nuclei activation. An experimental and theoretical investigation