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Journal Article

Turbulence effects on warm-rain autoconversion in precipitating shallow convection

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Nuijens,  L.
Observations and Process Studies, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Stevens,  Bjorn       
Director’s Research Group AES, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society;

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Citation

Seifert, A., Nuijens, L., & Stevens, B. (2010). Turbulence effects on warm-rain autoconversion in precipitating shallow convection. Quarterly Journal of the Royal Meteorological Society, 136, 1753-1762. doi:10.1002/qj.684.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-F5AF-7
Abstract
A parametrization of the rain formation in warm clouds is developed which includes the effects of turbulence on the collision rate of droplets in a cloud. It is shown that already moderate turbulence with dissipation rates of 400 cm(2)s(-3) can lead to a significant speed-up of the rain formation corresponding to an increase in the autoconversion rate by a factor of 4-6 depending on the size of the droplets. Large-eddy simulations of trade wind cumuli also produce a significant enhancement of rain formation through turbulence effects on cloud microphysics. In small cumulus clouds, the highest turbulent dissipation rates occur near cloud-top, which is also the decisive region of the cloud for the initial rain formation. Copyright (C) 2010 Royal Meteorological Society