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How Porosity Influences the Heterogeneous Ice Nucleation Ability of Secondary Organic Aerosol Particles

Wagner, Robert ORCID iD icon 1; Hu, Yaqiong ORCID iD icon 1; Bogert, Pia ORCID iD icon 1; Höhler, Kristina ORCID iD icon 1; Kiselev, Alexei 1; Möhler, Ottmar 1; Saathoff, Harald ORCID iD icon 1; Umo, Nsikanabasi ORCID iD icon 1; Zanatta, Marco 1
1 Institut für Meteorologie und Klimaforschung (IMK), Karlsruher Institut für Technologie (KIT)

Abstract:

During processing in deep convective cloud systems, highly viscous or glassy secondary organic aerosol (SOA) particles can develop a porous structure through a process known as atmospheric freeze-drying. This structural modification may enhance their heterogeneous ice nucleation ability under cirrus conditions through the pore condensation and freezing mechanism. Pristine, compact SOA particles, on the other hand, are recommended to be treated as ice-inactive in models. This recommendation also applies to internally mixed particles, where a coating layer of secondary organic matter (SOM) deactivates the intrinsic ice nucleation ability of the core, which may be a mineral dust grain. Ice cloud-processing may also improve the ice nucleation ability of such a composite particle by inducing structural changes in the coating layer, which can release active sites on the mineral surface. In this work, we investigated the change in the ice nucleation ability of pure SOA particles from the ozonolysis of alpha-pinene and two types of internally mixed particles (zeolite and coal fly ash particles coated with SOM) after being subjected to the atmospheric freeze-drying process simulated in an expansion cloud chamber. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000175796
Veröffentlicht am 31.10.2024
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Meteorologie und Klimaforschung Troposphärenforschung (IMKTRO)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 28.10.2024
Sprache Englisch
Identifikator ISSN: 2169-897X, 2169-8996
KITopen-ID: 1000175796
HGF-Programm 12.11.26 (POF IV, LK 01) Aerosol-Cloud-Climate-Interaction
Erschienen in Journal of Geophysical Research: Atmospheres
Verlag John Wiley and Sons
Band 129
Heft 20
Seiten Art.-Nr.: JD041576
Vorab online veröffentlicht am 22.10.2024
Nachgewiesen in Dimensions
Web of Science
Scopus
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