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dc.contributor.authorFrey, Wiebke
dc.contributor.authorHu, Dawei
dc.contributor.authorDorsey, James
dc.contributor.authorAlfarra, M Rami
dc.contributor.authorPajunoja, Aki
dc.contributor.authorVirtanen, Annele
dc.contributor.authorConnolly, Paul
dc.contributor.authorMcFiggans, Gordon
dc.date.accessioned2018-08-14T11:34:03Z
dc.date.available2018-08-14T11:34:03Z
dc.date.issued2018
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/6790
dc.description.abstractSecondary organic aerosol (SOA) particles have been found to be efficient ice-nucleating particles under the cold conditions of (tropical) upper-tropospheric cirrus clouds. Whether they also are efficient at initiating freezing under slightly warmer conditions as found in mixed-phase clouds remains undetermined. Here, we study the ice-nucleating ability of photochemically produced SOA particles with the combination of the Manchester Aerosol Chamber and Manchester Ice Cloud Chamber. Three SOA systems were tested resembling biogenic and anthropogenic particles as well as particles of different phase state. These are namely α-pinene, heptadecane, and 1,3,5-trimethylbenzene. After the aerosol particles were formed, they were transferred into the cloud chamber, where subsequent quasi-adiabatic cloud activation experiments were performed. Additionally, the ice-forming abilities of ammonium sulfate and kaolinite were investigated as a reference to test the experimental setup. Clouds were formed in the temperature range of −20 to −28.6 °C. Only the reference experiment using dust particles showed evidence of ice nucleation. No ice particles were observed in any other experiment. Thus, we conclude that SOA particles produced under the conditions of the reported experiments are not efficient ice-nucleating particles starting at liquid saturation under mixed-phase cloud conditions.
dc.language.isoenglanti
dc.publisherCopernicus GmbH
dc.relation.ispartofseriesATMOSPHERIC CHEMISTRY AND PHYSICS
dc.relation.urihttp://dx.doi.org/10.5194/acp-18-9393-2018
dc.rightsCC BY http://creativecommons.org/licenses/by/4.0/
dc.titleThe efficiency of secondary organic aerosol particles acting as ice-nucleating particles under mixed-phase cloud conditions
dc.description.versionpublished version
dc.contributor.departmentDepartment of Applied Physics, activities
uef.solecris.id55989296en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© Authors
dc.relation.doi10.5194/acp-18-9393-2018
dc.description.reviewstatuspeerReviewed
dc.format.pagerange9393-9409
dc.publisher.countrySaksa
dc.relation.issn1680-7316
dc.relation.issue13
dc.relation.volume18
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessOpen access -julkaisukanavassa ilmestynyt julkaisu


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