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dc.contributor.authorKulmala, M.
dc.contributor.authorLaakso, L.
dc.contributor.authorVana, M.
dc.contributor.authorGagné, S.
dc.contributor.authorLeppä, J.
dc.contributor.authorPetäjä, T.
dc.contributor.authorMcGrath, M.J
dc.contributor.authorKerminen, V.-M.
dc.date.accessioned2012-09-07T11:41:40Z
dc.date.available2012-09-07T11:41:40Z
dc.date.issued2011
dc.identifier.citationGagné, 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.issn1680-7316
dc.identifier.urihttp://hdl.handle.net/10394/7259
dc.descriptionIn 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.abstractThe 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.urihttp://dx.doi.org/10.5194/acpd-11-15875-2011 (discussion paper)
dc.description.urihttp://dx.doi.org/10.5194/acp-12-4647-2012 (final paper)
dc.description.urihttp://www.atmos-chem-phys-discuss.net/11/15875/2011/acpd-11-15875-2011.pdf (discussion paper)
dc.description.urihttp://www.atmos-chem-phys.net/12/4647/2012/acp-12-4647-2012.pdf (finale artikel)
dc.language.isoenen_US
dc.publisherCopernicus Publicationsen_US
dc.titleMeasurements of aerosol charging states in Helsinki, Finlanden_US
dc.title.alternativeAerosol charging state at an urban site: new analytical approach and implications for ion-induced nucleation
dc.typeArticleen_US
dc.description.versionFinale 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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