Heterogeneous ice nucleation of viscous secondary organic aerosol produced from ozonolysis of alpha-pinene

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Ignatius , K , Kristensen , T B , Jaervinen , E , Nichman , L , Fuchs , C , Gordon , H , Herenz , P , Hoyle , C R , Duplissy , J , Garimella , S , Dias , A , Frege , C , Hoeppel , N , Troestl , J , Wagner , R , Yan , C , Amorim , A , Baltensperger , U , Curtius , J , Donahue , N M , Gallagher , M W , Kirkby , J , Kulmala , M , Moehler , O , Saathoff , H , Schnaiter , M , Tome , A , Virtanen , A , Worsnop , D & Stratmann , F 2016 , ' Heterogeneous ice nucleation of viscous secondary organic aerosol produced from ozonolysis of alpha-pinene ' , Atmospheric Chemistry and Physics , vol. 16 , no. 10 , pp. 6495-6509 . https://doi.org/10.5194/acp-16-6495-2016

Title: Heterogeneous ice nucleation of viscous secondary organic aerosol produced from ozonolysis of alpha-pinene
Author: Ignatius, Karoliina; Kristensen, Thomas B.; Jaervinen, Emma; Nichman, Leonid; Fuchs, Claudia; Gordon, Hamish; Herenz, Paul; Hoyle, Christopher R.; Duplissy, Jonathan; Garimella, Sarvesh; Dias, Antonio; Frege, Carla; Hoeppel, Niko; Troestl, Jasmin; Wagner, Robert; Yan, Chao; Amorim, Antonio; Baltensperger, Urs; Curtius, Joachim; Donahue, Neil M.; Gallagher, Martin W.; Kirkby, Jasper; Kulmala, Markku; Moehler, Ottmar; Saathoff, Harald; Schnaiter, Martin; Tome, Antonio; Virtanen, Annele; Worsnop, Douglas; Stratmann, Frank
Contributor organization: Department of Physics
Polar and arctic atmospheric research (PANDA)
Date: 2016
Language: eng
Number of pages: 15
Belongs to series: Atmospheric Chemistry and Physics
ISSN: 1680-7316
DOI: https://doi.org/10.5194/acp-16-6495-2016
URI: http://hdl.handle.net/10138/165465
Abstract: There are strong indications that particles containing secondary organic aerosol (SOA) exhibit amorphous solid or semi-solid phase states in the atmosphere. This may facilitate heterogeneous ice nucleation and thus influence cloud properties. However, experimental ice nucleation studies of biogenic SOA are scarce. Here, we investigated the ice nucleation ability of viscous SOA particles. The SOA particles were produced from the ozone initiated oxidation of alpha-pinene in an aerosol chamber at temperatures in the range from -38 to -10aEuro-A degrees C at 5-15aEuro-% relative humidity with respect to water to ensure their formation in a highly viscous phase state, i.e. semi-solid or glassy. The ice nucleation ability of SOA particles with different sizes was investigated with a new continuous flow diffusion chamber. For the first time, we observed heterogeneous ice nucleation of viscous alpha-pinene SOA for ice saturation ratios between 1.3 and 1.4 significantly below the homogeneous freezing limit. The maximum frozen fractions found at temperatures between -39.0 and -37.2aEuro-A degrees C ranged from 6 to 20aEuro-% and did not depend on the particle surface area. Global modelling of monoterpene SOA particles suggests that viscous biogenic SOA particles are indeed present in regions where cirrus cloud formation takes place. Hence, they could make up an important contribution to the global ice nucleating particle budget.
114 Physical sciences
Peer reviewed: Yes
Rights: cc_by
Usage restriction: openAccess
Self-archived version: publishedVersion

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