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dc.contributor.authorDalirian, Maryam
dc.contributor.authorYlisirniä, Arttu
dc.contributor.authorBuchholz, Angela
dc.contributor.authorSchlesinger, Daniel
dc.contributor.authorStröm, Johan
dc.contributor.authorVirtanen, Annele
dc.contributor.authorRiipinen, Ilona
dc.date.accessioned2018-10-01T10:23:17Z
dc.date.available2018-10-01T10:23:17Z
dc.date.issued2018
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/6994
dc.description.abstractAtmospheric black carbon (BC) particles are a concern due to their impact on air quality and climate. Their net climate effect is, however, still uncertain. This uncertainty is partly related to the contribution of coated BC particles to the global cloud condensation nuclei (CCN) budgets. In this study, laboratory measurements were performed to investigate CCN activity of BC (REGAL 400R pigment black) particles, in pure state or coated through evaporating and subsequent condensation of glutaric acid, levoglucosan (both water-soluble organics) or oleic acid (an organic compound with low solubility). A combination of soot particle aerosol mass spectrometer (SP-AMS) measurements and size distribution measurements with a scanning mobility particle sizer (SMPS) showed that the studied BC particles were nearly spherical agglomerates with a fractal dimension of 2.79 and that they were coated evenly by the organic species. The CCN activity of BC particles increased after coating with all the studied compounds and was governed by the fraction of organic material. The CCN activation of the BC particles coated by glutaric acid and levoglucosan were in good agreement with the theoretical calculations using the shell-and-core model, which is based on a combination of the CCN activities of the pure compounds. The oleic acid coating enhanced the CCN activity of the BC particles, even though the pure oleic acid particles were CCN inactive. The surprising effect of oleic acid might be related to the arrangement of the oleic acid molecules on the surface of the BC cores or other surface phenomena facilitating water condensation onto the coated particles. Our results show that present theories have potential for accurately predicting the CCN activity of atmospheric BC coated with organic species, given that the identities and amounts of the coating species are known. Furthermore, our results suggest that even relatively thin soluble coatings (around 2nm for the compounds studied here) are enough to make the insoluble BC particles CCN active at typical atmospheric supersaturations and thus be efficiently taken up by cloud droplets. This highlights the need for an accurate description of the composition of atmospheric particles containing BC to unravel their net impact on climate.
dc.language.isoenglanti
dc.publisherCopernicus GmbH
dc.relation.ispartofseriesATMOSPHERIC CHEMISTRY AND PHYSICS
dc.relation.urihttp://dx.doi.org/10.5194/acp-18-12477-2018
dc.rightsCC BY http://creativecommons.org/licenses/by/4.0/
dc.titleCloud droplet activation of black carbon particles coated with organic compounds of varying solubility
dc.description.versionpublished version
dc.contributor.departmentDepartment of Applied Physics, activities
uef.solecris.id57104793en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© Authors
dc.relation.doi10.5194/acp-18-12477-2018
dc.description.reviewstatuspeerReviewed
dc.format.pagerange12477-12489
dc.relation.issn1680-7316
dc.relation.issue16
dc.relation.volume18
dc.rights.accesslevelopenAccess
dc.type.okmA1
uef.solecris.openaccessOpen access -julkaisukanavassa ilmestynyt julkaisu


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