Evolution of non-uniformly seeded warm clouds in idealized turbulent conditions

Derevyanko, Stanislav; Falkovich, Gregory and Turitsyn, Sergei (2008). Evolution of non-uniformly seeded warm clouds in idealized turbulent conditions. New Journal of Physics, 10 ,

Abstract

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.

Publication DOI: https://doi.org/10.1088/1367-2630/10/7/075019
Divisions: Engineering & Applied Sciences > Mathematics
Engineering & Applied Sciences > Electrical, electronic & power engineering
Additional Information: Third parties have the same rights to reuse articles in NJP as described in the Creative Commons Attribution-Non-Commercial-ShareAlike 3.0 license. These open-access rights allow third-party users to copy, distribute and display the published version of articles in NJP, and create derivative works, subject to appropriate attribution and non-commercial exploitation.
Uncontrolled Keywords: cloud evolution,droplet growth,droplet loss,cloud turbulence,Physics and Astronomy(all)
Published Date: 2008-07-31

Download

[img]

Export / Share Citation


Statistics

Additional statistics for this record