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Date
2020-08-12Type
- Journal Article
Citations
Cited 12 times in
Web of Science
Cited 13 times in
Scopus
ETH Bibliography
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Abstract
It has recently been shown that pore condensation and freezing (PCF) is a mechanism responsible for ice formation under cirrus cloud conditions. PCF is defined as the condensation of liquid water in narrow capillaries below water saturation due to the inverse Kelvin effect, followed by either heterogeneous or homogeneous nucleation depending on the temperature regime and presence of an ice-nucleating active site. By using sol-gel synthesized silica with well-defined pore diameters, morphology and distinct chemical surface-functionalization, the role of the water-silica contact angle and pore width on PCF is investigated. We find that for the pore diameters (2.2-9.2 nm) and water contact angles (15-78 degrees) covered in this study, our results reveal that the water contact angle plays an important role in predicting the humidity required for pore filling, while the pore diameter determines the ability of pore water to freeze. For T > 235 K and below water saturation, pore diameters and water contact angles were not able to predict the freezing ability of the particles, suggesting an absence of active sites; thus ice nucleation did not proceed via a PCF mechanism. Rather, the ice-nucleating ability of the particles depended solely on chemical functionalization. Therefore, parameterizations for the ice-nucleating abilities of particles in cirrus conditions should differ from parameterizations at mixed-phase clouds conditions. Our results support PCF as the atmospherically relevant ice nucleation mechanism below water saturation when porous surfaces are encountered in the troposphere. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000438995Publication status
publishedExternal links
Journal / series
Atmospheric Chemistry and PhysicsVolume
Pages / Article No.
Publisher
CopernicusOrganisational unit
03690 - Lohmann, Ulrike / Lohmann, Ulrike
Funding
156581 - Elucidating Ice Nucleation Mechanisms Relevant to the Atmosphere: Is deposition nucleation really immersion freezing in pores? (SNF)
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Show all metadata
Citations
Cited 12 times in
Web of Science
Cited 13 times in
Scopus
ETH Bibliography
yes
Altmetrics