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dc.contributor.authorKontkanen Jenni
dc.contributor.authorJärvinen Emma
dc.contributor.authorManninen Hanna E.
dc.contributor.authorLehtipalo Katrianne
dc.contributor.authorKangasluoma Juha
dc.contributor.authorDecesari Stefano
dc.contributor.authorGobbi Gian Paolo
dc.contributor.authorLaaksonen Ari
dc.contributor.authorPetäjä Tuukka
dc.contributor.authorKulmala Markku
dc.date.accessioned2017-03-14T09:45:46Z
dc.date.available2017-03-14T09:45:46Z
dc.date.issued2016
dc.identifier10.5194/acp-16-1919-2016fi_FI
dc.identifier.issn1680-7316
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/541
dc.descriptionArticle
dc.description.abstractThe concentrations of neutral and charged sub-3nm clusters and their connection to new particle formation (NPF) were investigated during the PEGASOS campaign (7 June–9 July 2012) at the San Pietro Capofiume measurement station in the Po Valley, Italy. Continuous high concentrations of sub-3nm clusters were detected during the measurement period, although the condensation sink was relatively high (median value 1.1 × 10−2 s−1). The median cluster concentrations were 2140 and 7980 cm−3 in the size bins of 1.5–1.8 and 1.8–3 nm, and the majority of them were electrically neutral. NPF events were observed during the measurement period frequently, on 86 % of the days. The median growth rates of clusters during the events were 4.3, 6.0 and 7.2 nm h−1 in the size ranges of 1.5–3, 3–7 and 7–20 nm. The median formation rate of 1.6 nm clusters was high, 45 cm−3 s−1, and it exceeded the median formation rate of 2 nm clusters by 1 order of magnitude. The ion-induced nucleation fraction was low; the median values were 0.7 % at 1.6 nm and 3.0 % at 2 nm. On NPF event days the neutral cluster concentration had a maximum around 09:00 (local winter time), which was absent on a non-event day. The increase in the cluster concentrations in the morning coincided with the increase in the boundary layer height. At the same time radiation, temperature and SO2 concentration increased, and RH and condensation sink decreased. The concentrations of neutral and charged clusters were observed to have a positive correlation with sulfuric acid proxy, indicating the significance of sulfuric acid for the cluster formation in San Pietro Capofiume. The condensation sink had a negative correlation with the concentration of charged clusters but no clear relation to the neutral cluster concentration. This finding, together with back-trajectory analysis, suggests that the precursor vapors of the clusters and background aerosol particles, acting as their sink, have possibly originated from the same sources, including e.g., power plants and industrial areas in the Po Valley.fi_FI
dc.language.isoENfi_FI
dc.publisherCopernicus Publications on behalf of the European Geosciences Unionfi_FI
dc.relation.ispartofseriesATMOSPHERIC CHEMISTRY AND PHYSICS;
dc.relation.urihttp://www.atmos-chem-phys.net/16/1919/2016/fi_FI
dc.rightsCC BY http://creativecommons.org/licenses/by/3.0/
dc.titleHigh concentrations of sub-3nm clusters and frequent new particle formation observed in the Po Valley, Italy, during the PEGASOS 2012 campaignfi_FI
dc.typehttp://purl.org/eprint/type/JournalArticle
dc.description.versionPublisher's pdffi_FI
dc.contributor.departmentDepartment of Applied Physics, activities
uef.solecris.id42879447
eprint.statushttp://purl.org/eprint/status/PeerReviewedfi_FI
dc.type.publicationinfo:eu-repo/semantics/article
dc.rights.accessrights© Authors
uef.citationinfo.issue16
uef.citationinfo.pages1919-1935
dc.relation.doi10.5194/acp-16-1919-2016
dc.description.reviewstatushttp://purl.org/eprint/status/PeerReviewed
dc.format.pagerange1919-1935
dc.relation.issn1680-7316
dc.relation.issue16
dc.rights.accesslevelopenAccess


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