Ice nucleation activity of mineral dust from Morocco and Iceland in immersion freezing mode and its relationship with mineralogy and particle size
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Le résumé fourni par la source
Ice nucleation activity (INA) in the mixed-phase cloud (MPC) regime has been extensively studied. Nevertheless, most research has focused on particles smaller than a few micrometers, leaving the INA dependence on mineralogical composition and size poorly characterized for particles larger than ten micrometers in diameter. This gap is important because: (1) large mineral dust particles (LMDPs) can undergo long-range atmospheric transport and reach altitudes where MPCs form; (2) their mineralogical composition may differ from that of smaller particles, affecting the density of ice-active sites; and (3) larger particles are more susceptible to atmospheric aging through coatings by chemical and organic compounds, which can further modify their INA. Here, we used natural soil dust samples collected during field campaigns in Morocco and Iceland, covering particle sizes from fine to super-coarse dust and characterized in terms of mineralogical composition and size. The samples' INA was measured in the AIDA and AIDAm cloud chambers and the INSEKT and IR-DROFA freezing assays in more than 300 experiments. Moroccan samples exhibited INA comparable to that reported for K-feldspar in previous studies, with no dependence on particle size, consistent with the nearly constant K-feldspar fraction across all size bins. In contrast, Icelandic samples showed lower INA than in other studies using samples of similar composition, along with a subtle size dependence linked to the size-varying pyroxene content, which decreased with increasing particle size. Our findings elucidate the role of LMDPs in immersion freezing and their relationship with mineralogy and size for low- and high-latitude dust sources.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Ice nucleation activity of mineral dust from Morocco and Iceland in immersion freezing mode and its relationship with mineralogy and particle size
- Date Crossref
- 29/06/2026
- Éditeur
- Copernicus GmbH
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Karlsruhe Institute of Technology pays non établi dans la noticeUniversité ou école supérieure
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Institute of Atmospheric Sciences and Climate pays non établi dans la noticeStructure de recherche
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National Research Council pays non établi dans la noticeOrganisation à but non lucratif
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Consejo Superior de Investigaciones Científicas pays non établi dans la noticeOrganisme public
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Barcelona Supercomputing Center pays non établi dans la noticeStructure de recherche
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Institute of Environmental Assessment and Water Research pays non établi dans la noticeStructure de recherche
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Universitat Politècnica de Catalunya pays non établi dans la noticeUniversité ou école supérieure
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Technische Universität Darmstadt pays non établi dans la noticeUniversité ou école supérieure
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Technical University Darmstadt pays non établi dans la noticeUniversité ou école supérieure
Karlsruhe Institute of Technology, Institute of Atmospheric Sciences and Climate et National Research Council, avec 6 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.