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dc.contributor.authorVäisänen Olli
dc.contributor.authorRuuskanen Antti
dc.contributor.authorYlisirniö Arttu
dc.contributor.authorMiettinen Pasi
dc.contributor.authorPortin Harri
dc.contributor.authorHao Liqing
dc.contributor.authorLeskinen Ari
dc.contributor.authorKomppula Mika
dc.contributor.authorRomakkaniemi Sami
dc.contributor.authorLehtinen Kari EJ
dc.contributor.authorVirtanen Annele
dc.date.accessioned2018-02-26T09:15:03Z
dc.date.available2018-02-26T09:15:03Z
dc.date.issued2016
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/6158
dc.description.abstractThe relationship between aerosol hygroscopicity and cloud droplet activation was studied at the Puijo measurement station in Kuopio, Finland, during the autumn 2014. The hygroscopic growth of 80, 120 and 150  nm particles was measured at 90 % relative humidity with a hygroscopic tandem differential mobility analyzer. Typically, the growth factor (GF) distributions appeared bimodal with clearly distinguishable peaks around 1.0–1.1 and 1.4–1.6. However, the relative contribution of the two modes appeared highly variable reflecting the probable presence of fresh anthropogenic particle emissions. The hygroscopicity-dependent activation properties were estimated in a case study comprising four separate cloud events with varying characteristics. At 120 and 150 nm, the activation efficiencies within the low- and high-GF modes varied between 0–34 and 57–83 %, respectively, indicating that the less hygroscopic particles remained mostly non-activated, whereas the more hygroscopic mode was predominantly scavenged into cloud droplets. By modifying the measured GF distributions, it was estimated how the cloud droplet concentrations would change if all the particles belonged to the more hygroscopic group. According to κ-Köhler simulations, the cloud droplet concentrations increased up to 70 % when the possible feedback effects on effective peak supersaturation (between 0.16 and 0.29 %) were assumed negligible. This is an indirect but clear illustration of the sensitivity of cloud formation to aerosol chemical composition.en
dc.language.isoENen
dc.publisherCopernicus Publications on behalf of the European Geosciences Unionen
dc.relation.ispartofseriesATMOSPHERIC CHEMISTRY AND PHYSICSen
dc.relation.urihttp://dx.doi.org/10.5194/acp-16-10385-2016en
dc.rightsCC BY http://creativecommons.org/licenses/by/4.0/en
dc.titleIn-cloud measurements highlight the role of aerosol hygroscopicity in cloud droplet formationen
dc.description.versionpublished versionen
dc.contributor.departmentDepartment of Applied Physics, activitiesen
uef.solecris.id44075950en
dc.type.publicationinfo:eu-repo/semantics/articleen
dc.rights.accessrights© Authorsen
dc.relation.projectidinfo:eu-repo/grantAgreement/EC/FP7-IDEAS-ERC/335478/EU/ Quantifying the atmospheric implications of the solid phase and phase transitions of secondary organic aerosols/QAPPAen
dc.relation.doi10.5194/acp-16-10385-2016en
dc.description.reviewstatuspeerRevieweden
dc.format.pagerange10385-10398en
dc.publisher.countrySaksaen
dc.relation.issn1680-7316en
dc.relation.volume16en
dc.rights.accesslevelopenAccessen
dc.type.okmA1en
dc.type.versioninfo:eu-repo/semantics/publishedVersionen
uef.solecris.openaccessOpen access -julkaisukanavassa ilmestynyt julkaisu


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