Articles | Volume 16, issue 10
Atmos. Chem. Phys., 16, 6495–6509, 2016
https://doi.org/10.5194/acp-16-6495-2016

Special issue: The CERN CLOUD experiment (ACP/AMT inter-journal SI)

Atmos. Chem. Phys., 16, 6495–6509, 2016
https://doi.org/10.5194/acp-16-6495-2016

Research article 27 May 2016

Research article | 27 May 2016

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

Karoliina Ignatius et al.

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Short summary
Viscous solid or semi-solid secondary organic aerosol (SOA) may influence cloud properties through ice nucleation in the atmosphere. Here, we observed heterogeneous ice nucleation of viscous α-pinene SOA at temperatures between −39 °C and −37.2 °C with ice saturation ratios significantly below the homogeneous freezing limit. Global modelling suggests that viscous biogenic SOA are present in regions where cirrus formation takes place and could contribute to the global ice nuclei budget.
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