Articles | Volume 16, issue 18
Atmos. Chem. Phys., 16, 12127–12141, 2016
https://doi.org/10.5194/acp-16-12127-2016
Atmos. Chem. Phys., 16, 12127–12141, 2016
https://doi.org/10.5194/acp-16-12127-2016

Research article 28 Sep 2016

Research article | 28 Sep 2016

Turbulence effects on warm-rain formation in precipitating shallow convection revisited

Axel Seifert and Ryo Onishi

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Subject: Clouds and Precipitation | Research Activity: Atmospheric Modelling | Altitude Range: Troposphere | Science Focus: Physics (physical properties and processes)
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Cited articles

Ayala, O., Rosa, B., and Wang, L.-P.: Effects of turbulence on the geometric collision rate of sedimenting droplets. Part 2. Theory and parameterization, New J. Phys., 10, 075016, https://doi.org/10.1088/1367-2630/10/7/075016, 2008a.
Ayala, O., Rosa, B., Wang, L.-P., and Grabowski, W.: Effects of turbulence on the geometric collision rate of sedimenting droplets. Part 1. Results from direct numerical simulation, New J. Phys., 10, 075015, https://doi.org/10.1088/1367-2630/10/7/075015, 2008b.
Beard, K. V. and Ochs, H. T.: Warm-Rain Initiation: An Overview of Microphysical Mechanisms, J. Appl. Meteorol., 32, 608–625, 1993.
Beheng, K. D.: The evolution of raindrop spectra: A review of basic microphysical essentials, Rainfall: State of the Science, Geophys. Monogr., 191, 29–48, 2010.
Beheng, K. D. and Doms, G.: A general formulation of collection rates of cloud and raindrops using the kinetic equation and comparison with parameterizations, Contrib. Atmos. Phys., 59, 66–84, 1986.
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Short summary
In this study we investigate the effect of turbulence on rain formation in shallow clouds. Several formulations of the collision kernel for turbulent flows using different turbulence models have been suggested in recent years. Here we compare two formulations and find that, although both give a significant increase in collision rate, the differences are quite large, especially for high Reynolds numbers as they are observed in clouds.
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