<i>Physics of Drop Formation in the Atmosphere</i>

Sedunov, Yu. S.; Marlow, W. H.

doi:10.1063/1.3068968

Cited by 54 publications

(81 citation statements)

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“…Thus the volume of air occupied by a single cloud droplet is much larger than the volume affected by variations in the moisture and temperature. Although some authors (Sedunov, 1974;Fukuta, 1992) have concluded that direct competition between droplets is negligible under typical cloud conditions, there is yet to be a clear demonstration that these effects are not important.…”

Section: Length Scales Associated With Condensational Growth Of Dropletsmentioning

confidence: 99%

Droplet growth in warm turbulent clouds

Devenish

Bartello

Brenguier

et al. 2012

Quart J Royal Meteoro Soc

243

281

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In this survey we consider the impact of turbulence on cloud formation from the cloud scale to the droplet scale. We assess progress in understanding the effect of turbulence on the condensational and collisional growth of droplets and the effect of entrainment and mixing on the droplet spectrum. The increasing power of computers and better experimental and observational techniques allow for a much more detailed study of these processes than was hitherto possible. However, much of the research necessarily remains idealized and we argue that it is those studies which include such fundamental characteristics of clouds as droplet sedimentation and latent heating that are most relevant to clouds. Nevertheless, the large body of research over the last decade is beginning to allow tentative conclusions to be made. For example, it is unlikely that small-scale turbulent eddies (i.e. not the energy-containing eddies) alone are responsible for broadening the droplet size spectrum during the initial stage of droplet growth due to condensation. It is likely, though, that small-scale turbulence plays a significant role in the growth of droplets through collisions and coalescence. Moreover, it has been possible through detailed numerical simulations to assess the relative importance of different processes to the turbulent collision kernel and how this varies in the parameter space that is important to clouds. The focus of research on the role of turbulence in condensational and collisional growth has tended to ignore the effect of entrainment and mixing and it is arguable that they play at least as important a role in the evolution of the droplet spectrum. We consider the role of turbulence in the mixing of dry and cloudy air, methods of quantifying this mixing and the effect that it has on the droplet spectrum. Copyright

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Section: Length Scales Associated With Condensational Growth Of Dropletsmentioning

confidence: 99%

Droplet growth in warm turbulent clouds

Devenish

Bartello

Brenguier

et al. 2012

Quart J Royal Meteoro Soc

243

281

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“…For the special case b = −1 (radius growth equation for liquid droplets) formally identical solutions have been obtained using another method (seemingly going back to Sedunov, 1974) by Brenguier (1991, eq. 2.5).…”

Section: Appendix a Solution Of The Spectral Growth Equationmentioning

confidence: 99%

Analytical treatment of ice sublimation and test of sublimation parameterisations in two–moment ice microphysics models

Gierens

Bretl

2009

Atmos. Chem. Phys.

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Abstract.We derive an analytic solution to the spectral growth/sublimation equation for ice crystals and apply it to idealised cases. The results are used to test parameterisations of the ice sublimation process in two-moment bulk microphysics models. Although it turns out that the relation between number loss fraction and mass loss fraction is not a function since it is not unique, it seems that a functional parameterisation is the best that one can do in a bulk model. Testing a more realistic case with humidity oscillations shows that artificial crystal loss can occur in simulations of mature cirrus clouds with relative humidity fluctuating about ice saturation.

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“…Here, the correction takes into account heat dissipation by Knudsen flow across the boundary layer. In evaluating p, , whose values fall around 0.7 in the present work, the thermal accommodation coefficient was set to unity according to standard practice (Sedunov, 1974;Pruppacher and Klett, 1978). The other quantities given in Eq.…”

Section: Time Secmentioning

confidence: 99%

Growth Rate Measurements for Single Suspended Droplets Using the Optical Resonance Method

Richardson

Lin

McGraw

et al. 1986

Aerosol Science and Technology

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An experimental technique described with which the ing condensational growth is monitored with a tunable growth rate of a single solution droplet by water vapor dye laser for a particular optical resonance due to Mie condensation can be repeatedly measured with high prescattering. A consideration of the coupled heat and mass cision. The technique involves the use of an elechansfer processes during droplet growth indicates that hodynamic cell to suspend a NaCl solution droplet in the best agreement between theory and the experimental water vapor and a COz laser to momentarily perturb the results is obtained with a condensation coefficient close droplet-vapor equilibrium. The droplet size change durto unity.

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Physics of Drop Formation in the Atmosphere

Cited by 54 publications

References 0 publications

Droplet growth in warm turbulent clouds

Droplet growth in warm turbulent clouds

Analytical treatment of ice sublimation and test of sublimation parameterisations in two–moment ice microphysics models

Growth Rate Measurements for Single Suspended Droplets Using the Optical Resonance Method

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