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Turbulence and cloud microphysics

Turbulence and cloud microphysics,10.1016/0169-8095(95)00035-6,Atmospheric Research,P. R. Jonas

Turbulence and cloud microphysics   (Citations: 52)
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The effects of in-cloud turbulence on the growth of cloud droplets by condensation and coalescence in low level water clouds are reviewed. It is shown that while the entrainment of dry air into clouds may explain the observed variability in the droplet spectra, and particularly in droplet concentration, doubt still exists as to whether the entrainment of subsaturated air can give rise to enhanced droplet growth by condensation, that is growth in excess of that expected in an adiabatic parcel. It is also shown that the increase in the length of the path of some of the droplets in stratocumulus due to turbulent updraughts can significantly increase the rate of production of drizzle sized droplets by coalescence. The effects of turbulence are generally believed to increase the collection kernels of cloud droplets, although the magnitude of the increase is in doubt. The impact of such changes on the growth of a population of cloud droplets by coalescence is sensitive to their magnitude. In particular, such changes may be capable of partially overcoming the barrier to growth which occurs between the condensation and coalescence processes in still air at a droplet radius of around 20 μm, although further detailed studies are required.
Journal: Atmospheric Research - ATMOS RES , vol. 40, no. 2, pp. 283-306, 1996
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    • ...[5] The vertical velocity structure within the boundary layer is also important in determining the cloud microphysical properties [Jonas, 1996; Feingold et al., 1999; Peng et al., 2005]...

    Virendra P. Ghateet al. Vertical velocity structure of nonprecipitating continental boundary l...

    • ...The value of Re � 20 m mi s also consistent with the study of Jonas [1996] who suggests that this size is a boundary between condensation and coagulation processes...

    Kentaroh Suzukiet al. Global identification of warm cloud microphysical processes with combi...

    • ...Precipitation tends to develop more rapidly than is generally predicted from elementary theories about diffusional growth of droplets and subsequent coalescence to precipitation sized particles [e.g., Jonas, 1996]...
    • ...Several hypotheses have been forwarded to explain the observed droplet size broadening, including the presence of giant nuclei [e.g., Houghton, 1938; Johnson, 1982; Laird et al., 2000] and various effects of turbulence [e.g., Vaillancourt et al., 2002] and localized enhancement of the collision efficiency [e.g., Jonas, 1996; Pinsky et al., 2000]...

    Graeme L. Stephenset al. Near global observations of the warm rain coalescence process

    • ...However, both qualitative understanding and quantitative treatment are far from satisfactory (see, e.g., Jonas 1996; Vaillancourt and Yau 2000; Shaw 2003; and references therein)...

    Gregory Falkovichet al. Sling Effect in Collisions of Water Droplets in Turbulent Clouds

    • ...Precipitation tends to develop more rapidly than is generally predicted from elementary theories about diffusional growth of droplets and subsequent coalescence to precipitation sized particles [e.g., Jonas, 1996]...
    • ...Several hypotheses have been forwarded to explain the observed droplet size broadening, including the presence of giant nuclei [e.g., Houghton, 1938; Johnson, 1982; Laird et al., 2000] and various effects of turbulence [e.g., Vaillancourt et al., 2002] and localized enhancement of the collision efficiency [e.g., Jonas, 1996; Pinsky et al., 2000]...

    Graeme L. Stephenset al. Near global observations of the warm rain coalescence process

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