| Téléchargement | - Voir la version finale : Heterogeneous ice nucleation of viscous secondary organic aerosol produced from ozonolysis of α-pinene (PDF, 1.4 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.5194/acp-16-6495-2016 |
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| Auteur | Rechercher : Ignatius, Karoliina; Rechercher : Kristensen, Thomas B.; Rechercher : Järvinen, Emma; Rechercher : Nichman, Leonid; Rechercher : Fuchs, Claudia; Rechercher : Gordon, Hamish; Rechercher : Herenz, Paul; Rechercher : Hoyle, Christopher R.; Rechercher : Duplissy, Jonathan; Rechercher : Garimella, Sarvesh; Rechercher : Dias, Antonio; Rechercher : Frege, Carla; Rechercher : Höppel, Niko; Rechercher : Tröstl, Jasmin; Rechercher : Wagner, Robert; Rechercher : Yan, Chao; Rechercher : Amorim, Antonio; Rechercher : Baltensperger, Urs; Rechercher : Curtius, Joachim; Rechercher : Donahue, Neil M.; Rechercher : Gallagher, Martin W.; Rechercher : Kirkby, Jasper; Rechercher : Kulmala, Markku; Rechercher : Möhler, Ottmar; Rechercher : Saathoff, Harald; Rechercher : Schnaiter, Martin; Rechercher : Tomé, Antonio; Rechercher : Virtanen, Annele; Rechercher : Worsnop, Douglas; Rechercher : Stratmann, Frank |
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| Format | Texte, Article |
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| Résumé | 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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| Date de publication | 2016-05-27 |
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| Maison d’édition | Copernicus Publications on behalf of the European Geosciences Union |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Publication du CNRC | Cette publication n’est pas du CNRCCe sont des publications qui ont été rédigées par un auteur du CNRC, mais avant que celui-ci soit employé du CNRC. |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 2ef54f28-d3c3-4b6d-998f-ccff7a383a6a |
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| Enregistrement créé | 2019-10-21 |
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| Enregistrement modifié | 2020-05-30 |
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