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

Ignatius, Karoliina; Kristensen, Thomas B. LU ; Järvinen, Emma; Nichman, Leonid; Fuchs, Claudia; Gordon, Hamish; Herenz, Paul; Hoyle, Christopher R.; Duplissy, Jonathan and Garimella, Sarvesh, et al. (2016) In Atmospheric Chemistry and Physics 16(10). p.6495-6509
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 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... (More)

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 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 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-37.2°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 nucleating particle budget.

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published
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Atmospheric Chemistry and Physics
volume
16
issue
10
pages
15 pages
publisher
Copernicus Gesellschaft mbH
external identifiers
  • scopus:84971567635
ISSN
1680-7316
DOI
10.5194/acp-16-6495-2016
language
English
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no
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aef90998-7b1c-4ee9-8224-b9cb485e1590
date added to LUP
2018-10-09 14:30:09
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2019-10-08 03:37:40
@article{aef90998-7b1c-4ee9-8224-b9cb485e1590,
  abstract     = {<p>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 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 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-37.2°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 nucleating particle budget.</p>},
  author       = {Ignatius, Karoliina and Kristensen, Thomas B. and Järvinen, Emma and Nichman, Leonid and Fuchs, Claudia and Gordon, Hamish and Herenz, Paul and Hoyle, Christopher R. and Duplissy, Jonathan and Garimella, Sarvesh and Dias, Antonio and Frege, Carla and Höppel, Niko and Tröstl, Jasmin and Wagner, Robert and Yan, Chao and Amorim, Antonio and Baltensperger, Urs and Curtius, Joachim and Donahue, Neil M. and Gallagher, Martin W. and Kirkby, Jasper and Kulmala, Markku and Möhler, Ottmar and Saathoff, Harald and Schnaiter, Martin and Tomé, Antonio and Virtanen, Annele and Worsnop, Douglas and Stratmann, Frank},
  issn         = {1680-7316},
  language     = {eng},
  month        = {05},
  number       = {10},
  pages        = {6495--6509},
  publisher    = {Copernicus Gesellschaft mbH},
  series       = {Atmospheric Chemistry and Physics},
  title        = {Heterogeneous ice nucleation of viscous secondary organic aerosol produced from ozonolysis of α-pinene},
  url          = {http://dx.doi.org/10.5194/acp-16-6495-2016},
  volume       = {16},
  year         = {2016},
}