Nucleation and Atmospheric Aerosols, vol. 1527 (2013) pp. 397-400
New particle formation (NPF) in the atmosphere substantially impacts ultrafine particle number concentrations and cloud condensation nuclei (CCN) levels. The impact of NPF on CCN levels depends on the ability of the particles to grow rapidly into the CCN size range thus avoiding loss due to scavenging. This work presents quantitative chemical composition measurements of individual 20 nm diameter particles during NPF using the Nano Aerosol Mass Spectrometer (NAMS). Sulfuric acid is shown to contribute quantitatively to changes in the sulfate mass fraction. However, growth due to sulfuric acid generally accounts for 50% of mass growth and is characteristic of fresh secondary organic aerosol. Differences in the overall growth rate from one event to another are caused by variations among all major chemical species and not just one individual species.
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