Measurement of the Charging State with an Ion-DMPS to Estimate the Contribution of Ion-induced Nucleation
In this work, the Ion-DMPS is presented and the analyzed data from over one year of measurements in Hyytiälä, Finland (April 13, 2005–September 21, 2006), is discussed. The Ion-DMPS allows calculation of the charging state of particles taking part in a nucleation event. A physically sound equation that describes that charging state of particles during a nucleation event is presented and fitted to the Ion-DMPS data. The behavior predicted by the equation of the charging state fitted very well to the experimental data obtained from the Ion-DMPS. According to this analysis, an overwhelming majority of the new particle formation events appeared to include at least some participation of ion-induced nucleation. The analysis of a year of data showed that the contribution of ion-induced nucleation varied between 0% and slightly less than 40%. The median ion-induced participation for the new particle formation events analyzed was between 5% and 10%.
Keywords Ion-induced nucleation, atmospheric aerosols, field measurements, Ion-DMPS
KeywordsRecombination DMPS Pasi
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