Journal article

Repeatability and randomness in heterogeneous freezing nucleation

Atmos. Chem. Phys. Atmospheric Chemistry and Physics, vol. 8 (2008) pp. 5017-5031

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This study is aimed at clarifying the relative im-portance of the specific character of the nuclei and of the duration of supercooling in heterogeneous freezing nucle-ation by immersed impurities. Laboratory experiments were carried out in which sets of water drops underwent multi-ple cycles of freezing and melting. The drops contained sus-pended particles of mixtures of materials; the resulting freez-ing temperatures ranged from −6 • C to −24 • C. Rank correla-tion coefficients between observed freezing temperatures of the drops in successive runs were >0.9 with very high sta-tistical significance, and thus provide strong support for the modified singular model of heterogeneous immersion freez-ing nucleation. For given drops, changes in freezing tem-peratures between cycles were relatively small (

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