DOI: 10.1002/jgrd.50641
论文题名: The mechanism of first raindrops formation in deep convective clouds
作者: Khain A. ; Prabha T.V. ; Benmoshe N. ; Pandithurai G. ; Ovchinnikov M.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 16 起始页码: 9123
结束页码: 9140
语种: 英语
Scopus关键词: Atmospheric thermodynamics
; Mixing
; Cloud condensation nuclei
; Cloud microphysical properties
; Deep convective clouds
; Droplet size distributions
; In-situ measurement
; Microphysical process
; Retrieval algorithms
; Turbulence closures
; Drops
; atmospheric modeling
; cloud condensation nucleus
; cloud microphysics
; convective cloud
; droplet
; in situ measurement
; raindrop
; three-dimensional modeling
; two-dimensional modeling
; volume
英文摘要: The formation of first raindrops in deep convective clouds is investigated. A combination of observational data analysis and 2D and 3D simulations of deep convective clouds suggests that the first raindrops form at the top of undiluted or slightly diluted cores. It is shown that droplet size distributions in these regions are wider and contain more large droplets than in diluted volumes. The results of the study suggest that the initial raindrop formation is determined by the basic microphysical processes within ascending adiabatic volumes. It allows one to predict the height of the formation of first raindrops considering the processes of cloud condensation nuclei activation, droplet diffusion growth, and coalescence growth. The results obtained in the study explain observational results through which the in-cloud height of first raindrop formation depends linearly on the droplet number concentration at cloud base. The results also explain why a simple adiabatic parcel model can reproduce this dependence. The present study provides a physical basis for retrieval algorithms of cloud microphysical properties and aerosol properties using satellites. The study indicates that the role of mixing and entrainment in the formation of the first raindrops is not of crucial importance. It is also shown that low variability of effective and mean volume radii along horizontal traverses, as regularly observed by in situ measurements, can be simulated by high-resolution cloud models in which mixing is parameterized by a traditional 1.5 order turbulence closure scheme. © 2013. Her Majesty the Queen in Right of Canada. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63376
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Atmospheric Sciences, Hebrew University of Jerusalem, Givat Ram, Jerusalem 91904, Israel; Indian Institute of Tropical Meteorology, Pune, India; Pacific Northwest National Laboratory, Richland, WA, United States
Recommended Citation:
Khain A.,Prabha T.V.,Benmoshe N.,et al. The mechanism of first raindrops formation in deep convective clouds[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(16)