Microphysical Processes in Ice and Mixed-Phase Clouds

Alexander P. Khain; Mark Pinsky

doi:10.1017/9781139049481.007

6 - Microphysical Processes in Ice and Mixed-Phase Clouds

Published online by Cambridge University Press: 22 August 2018

Alexander P. Khain and

Mark Pinsky

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Alexander P. Khain: Affiliation:
Hebrew University of Jerusalem
Mark Pinsky: Affiliation:
Hebrew University of Jerusalem

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Summary

Chapter 6 describes microphysical processes in mixed-phase and ice clouds. We analyze theories relevant to ice formation, ice-liquid-water vapor transformations, cloud glaciation, dry and wet growth of hail, the dynamics of ice particles and time-dependent melting and freezing. Basing on these theories, we explain the methods for deriving equations for accurate calculation of major parameters such as supersaturation and diffusional growth of drops and ice particles in mixed-phase clouds, for calculation of ice particles fall velocity and of collision efficiencies between water drops and ice particles and between ice particles, as well as the stochastic collection equations for mixed-phase clouds. Comparison is made between methods for calculating ice particles settling in bin microphysical vs. bulk parameterization schemes. We analyze conditions of hydrometeor types conversions. Special focus is put on novel methods for calculating the coalescence efficiency. Alongside with the methods, we describe and illustrate their application in cloud models. The Chapter ends with discussing the theories of ice multiplication and their representation in cloud models.

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Type: Chapter
Information: Physical Processes in Clouds and Cloud Modeling , pp. 344 - 496

DOI: https://doi.org/10.1017/9781139049481.007 [Opens in a new window]

Publisher: Cambridge University Press

Print publication year: 2018

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