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Authors: Baumgartner, Manuel
Spichtinger, Peter
Title: Towards a bulk approach to local interactions of hydrometeors
Online publication date: 22-Mar-2018
Year of first publication: 2018
Language: english
Abstract: The growth of small cloud droplets and ice crystals is dominated by the diffusion of water vapor. Usually, Maxwell’s approach to growth for isolated particles is used in describing this process. However, recent investigations show that local interactions between particles can change diffusion properties of cloud particles. In this study we develop an approach for including these local interactions into a bulk model approach. For this purpose, a simplified framework of local interaction is proposed and governing equations are derived from this setup. The new model is tested against direct simulations and incorporated into a parcel model framework. Using the parcel model, possible implications of the new model approach for clouds are investigated. The results indicate that for specific scenarios the lifetime of cloud droplets in subsaturated air may be longer (e.g., for an initially water supersaturated air parcel within a downdraft). These effects might have an impact on mixed-phase clouds, for example in terms of riming efficiencies.
DDC: 530 Physik
530 Physics
Institution: Johannes Gutenberg-Universität Mainz
Department: FB 08 Physik, Mathematik u. Informatik
Zentrum für Datenverarbeitung
Place: Mainz
Version: Published version
Publication type: Zeitschriftenaufsatz
License: CC BY
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Journal: Atmospheric chemistry and physics
Pages or article number: 2525
Publisher: EGU
Publisher place: Katlenburg-Lindau
Issue date: 2018
ISSN: 1680-7324
Publisher URL:
Publisher DOI: 10.5194/acp-18-2525-2018
Appears in collections:JGU-Publikationen

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