Measurements of aerosol charging states in Helsinki, Finland

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dc.contributor.author Kulmala, M.
dc.contributor.author Laakso, L.
dc.contributor.author Vana, M.
dc.contributor.author Gagné, S.
dc.contributor.author Leppä, J.
dc.contributor.author Petäjä, T.
dc.contributor.author McGrath, M.J
dc.contributor.author Kerminen, V.-M.
dc.date.accessioned 2012-09-07T11:41:40Z
dc.date.available 2012-09-07T11:41:40Z
dc.date.issued 2011
dc.identifier.citation Gagné, S. et al. 2011. Measurements of aerosol charging states in Helsinki, Finland. Atmospheric chemistry and physics discussion, 11:15875-15920. [www.atmos-chem-phys-discuss.net/11/15875/2011/] en_US
dc.identifier.issn 1680-7316
dc.identifier.uri http://hdl.handle.net/10394/7259
dc.description In the first stage, papers that pass a rapid access peer-review are immediately published on the Atmospheric Chemistry and Physics Discussions (ACPD) website. They are then subject to Interactive Public Discussion, during which the referees' comments (anonymous or attributed), additional short comments by other members of the scientific community (attributed) and the authors' replies are also published in ACPD. In the second stage, the peer-review process is completed and, if accepted, the final revised papers are published in ACP. To ensure publication precedence for authors, and to provide a lasting record of scientific discussion, ACPD and ACP are both ISSN-registered, permanently archived and fully citable.
dc.description.abstract The charging state of aerosol populations was measured with an Ion-DMPS in Helsinki, Finland between December 2008 and February 2010. Based on the charging states, we calculated the ion-induced nucleation fraction to be around 0.8 % ± 0.9 %. We review the role of ion-induced nucleation and propose different explanations for a low ion-induced nucleation participation in urban areas. We present a new method to retrieve the average charging state for an event, and a given size. We also use a new theoretical framework that allows for different concentrations of small cluster ions for different polarities (polarity asymmetry). We extrapolate the ion-induced fraction using polarity symmetry and asymmetry. Finally, a method to calculate the growth rates from the variation of the charging state as a function of the particle diameter using polarity symmetry and asymmetry is presented and used on a selection of new particle formation events. en_US
dc.description.uri http://dx.doi.org/10.5194/acpd-11-15875-2011 (discussion paper)
dc.description.uri http://dx.doi.org/10.5194/acp-12-4647-2012 (final paper)
dc.description.uri http://www.atmos-chem-phys-discuss.net/11/15875/2011/acpd-11-15875-2011.pdf (discussion paper)
dc.description.uri http://www.atmos-chem-phys.net/12/4647/2012/acp-12-4647-2012.pdf (finale artikel)
dc.language.iso en en_US
dc.publisher Copernicus Publications en_US
dc.title Measurements of aerosol charging states in Helsinki, Finland en_US
dc.title.alternative Aerosol charging state at an urban site: new analytical approach and implications for ion-induced nucleation
dc.type Article en_US
dc.description.version Finale artikel gepubliseer in: Atmospheric Chemistry and Physics, 12(10):4647-4666, 2012. Finale artikel se titel – Aerosol charging state of an urban site: new analytical approach and implications for ion-induced nucleation

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