Stanislav Derevyanko et al 2008 New J. Phys. 10 075019 doi:10.1088/1367-2630/10/7/075019
Evolution of non-uniformly seeded warm clouds in idealized turbulent conditions
Focus on Cloud PhysicsStanislav Derevyanko1,3, Gregory Falkovich2 and Sergei Turitsyn1
Show affiliationsPart of Focus on Cloud Physics
We present a mean-field model of cloud evolution that describes droplet growth due to condensation and collisions and droplet loss due to fallout. The model accounts for the effects of cloud turbulence both in a large-scale turbulent mixing and in a microphysical enhancement of condensation and collisions. The model allows for an effective numerical simulation by a scheme that is conservative in water mass and keeps accurate count of the number of droplets. We first study the homogeneous situation and determine how the rain-initiation time depends on the concentration of cloud condensation nuclei (CCN) and turbulence level. We then consider clouds with an inhomogeneous concentration of CCN and evaluate how the rain initiation time and the effective optical depth vary in space and time. We argue that over-seeding even a part of a cloud by small hygroscopic nuclei, one can substantially delay the onset and increase the amount of precipitation.
- PACS
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92.60.Nv Cloud physics; stratus and cumulus clouds
92.60.hk Convection, turbulence, and diffusion
92.60.Jq Water in the atmosphere (humidity, clouds, evaporation, precipitation)
- Subjects
- Dates
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Issue 7 (July 2008)
Received 21 November 2007
Published 31 July 2008
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Evolution of non-uniformly seeded warm clouds in idealized turbulent conditions
Stanislav Derevyanko et al 2008 New J. Phys. 10 075019
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