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

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 deposition ice nucleation and thus influenc
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 deposition ice nucleation and thus influence cirrus 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 α-pinene in an aerosol chamber at temperatures in the range from −38 to −10 ◦C at 5–15 % 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 α-pinene SOA in the deposition mode for ice saturation ratios between 1.3 and 1.4 significantly below the homogeneous freezing limit. The maximum frozen fractions found at temperatures between −36.5 and −38.3 °C ranged from 6 to 20 % 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 nuclei (IN) budget.
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Author:Karoliina Ignatius, Thomas Bjerring Kristensen, Emma Järvinen, Leonid Nichman, Claudia Fuchs, Hamish Gordon, Paul Herenz, Christopher Robert Hoyle, Jonathan Duplissy, Sarvesh Garimella, Antonio Dias, Carla Frege, Florian Niko Höppel, Jasmin Tröstl, Robert Wagner, Chao Yan, Antonio Amorim, Urs Baltensperger, Joachim Curtius, Neil McPherson Donahue, Martin William Gallagher, Jasper Kirkby, Markku Kulmala, Ottmar Möhler, Harald Saathoff, Martin Schnaiter, Antonio Tomé, Annele Virtanen, Douglas R. Worsnop, Frank Stratmann
URN:urn:nbn:de:hebis:30:3-418922
URL:http://www.atmos-chem-phys-discuss.net/15/35719/2015/
DOI:http://dx.doi.org/10.5194/acpd-15-35719-2015
ISSN:1680-7375
ISSN:1680-7367
Parent Title (English):Atmospheric chemistry and physics. Discussions
Publisher:European Geosciences Union
Place of publication:Katlenburg-Lindau
Document Type:Article
Language:English
Date of Publication (online):2016/11/17
Date of first Publication:2015/12/18
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2016/11/17
Volume:15
Pagenumber:34
First Page:35719
Last Page:35752
Note:
© Author(s) 2015. CC Attribution 3.0 License.
HeBIS PPN:424010259
Institutes:Geowissenschaften
Dewey Decimal Classification:550 Geowissenschaften
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - Namensnennung 3.0

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