DOI: 10.1002/2014JD021885
论文题名: Supersaturation and diffusional droplet growth in liquid clouds: Polydisperse spectra
作者: Pinsky M. ; Mazin I.P. ; Korolev A. ; Khain A.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 2169897X
出版年: 2014
卷: 119, 期: 22 起始页码: 12872
结束页码: 12887
语种: 英语
英文关键词: adiabatic processes
; diffusional growth
; liquid clouds
; supersaturation
Scopus关键词: aerosol
; cloud microphysics
; dispersion
; droplet
; size distribution
; supersaturation
; urban area
; vertical profile
; water vapor
英文摘要: Evolution of droplet size distribution (DSD) due to the water vapor diffusion in a vertically moving adiabatic parcels is investigated. Analytical expressions for height dependences of the main DSD parameters and DSD moments are obtained. The asymptotic behavior of the DSD parameters at large heights above cloud base is determined. It is shown that during diffusion growth, the width and the relative dispersion of the DSD decrease with height as z- 1/3 and z- 2/3, respectively. The paper presents examples of DSD evolution in cases DSD forms on aerosols with a three-mode lognormal distribution. The aerosol distribution parameters used in the study correspond to four aerosol types: "Marine," "Clean continental," "Background," and extremely polluted "Urban." The vertical profiles of DSD parameters are compared with the asymptotic profiles. It is shown that in case of polydisperse DSD evolution, the vertical profile of supersaturation within several hundred meters above the cloud base can be approximated by a supersaturation profile corresponding to the "equivalent" monodisperse DSD. The initial radius of this equivalent DSD is equal to the mean radius of polydisperse DSD (haze size distribution) at cloud base, which is estimated using the Kohler theory. This result of the relation between the polydisperse and monodisperse solutions is universal. A new equation for estimation of supersaturation maximum for polydisperse case is obtained. The obtained analytical expressions and numerical results are useful for understanding the mechanisms of DSD formation in clouds and for parameterization of warm microphysical processes in cloud models. ©2014. American Geophysical Union. All Rights Reserved. 资助项目: 1393/14
; 2010446
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63022
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Department of Atmospheric Sciences, Hebrew University of Jerusalem, Jerusalem, Israel; Center for Earth and Space Research, George Mason University, Fairfax, VA, United States; Environment Canada, Toronto, ON, Canada
Recommended Citation:
Pinsky M.,Mazin I.P.,Korolev A.,et al. Supersaturation and diffusional droplet growth in liquid clouds: Polydisperse spectra[J]. Journal of Geophysical Research Atmospheres,2014-01-01,119(22)