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          Institute: MPI für Meteorologie     Collection: Atmosphere in the Earth System     Display Documents



ID: 520742.0, MPI für Meteorologie / Atmosphere in the Earth System
Turbulence effects on warm-rain autoconversion in precipitating shallow convection
Authors:Seifert, A.; Nuijens, L.; Stevens, B.
Language:English
Date of Publication (YYYY-MM-DD):2010-10
Title of Journal:Quarterly Journal of the Royal Meteorological Society
Journal Abbrev.:Quart. J. RMS
Volume:136
Start Page:1753
End Page:1762
Review Status:not specified
Audience:Not Specified
Abstract / Description: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
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Atmosphere in the Earth System
Identifiers:DOI:10.1002/qj.684
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