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DOI | 10.1175/JAS-D-19-0036.1 |
Analytical Investigation of the Role of Lateral Mixing in the Evolution of Nonprecipitating Cumulus. Part I: Developing Clouds | |
Pinsky, M.; Khain, A. | |
2020-03-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:3页码:891-909 |
文章类型 | Article |
语种 | 英语 |
国家 | Israel |
英文摘要 | Evolution of nonprecipitating cumulus clouds (Cu) at the developing stage under the influence of lateral entrainment and mixing is studied analytically using a minimalistic analytical model. We present a model of an ascending cloud volume (a model of developing Cu) whose structure is determined by the processes of droplet diffusion growth/evaporation and entrainment mixing in the horizontal direction. Spatial and time changes of liquid water content, the adiabatic fraction, droplet concentration, and the mean volume droplet radius are calculated. It is shown that the existence of a nondiluted core in a growing cumulus cloud significantly depends on the cloud width and vertical velocity. While at the updraft velocity of 2 m s(-1) the core of a 400-m-wide cloud becomes diluted at distances of a few hundred meters above cloud base, the core of a cloud of 1000-m width remains nondiluted at distances up to 1500 m above cloud base. The explanation of this result is simple: the increase in cloud width and the decrease in the updraft velocity increase the time during which the cloud is diluted due to mixing. Since lateral mixing synchronously decreases both the cloud water content and droplet concentration, the variation of the mean volume droplet radius is low inside the cloud. The approximate quantitative condition for cloud formation in updraft is derived. It is shown that a cloud can arise when its vertical velocity exceeds a critical value. To produce clouds, narrow turbulent plumes should ascend at higher velocity as compared to wider plumes. High humidity of the environment air is favorable for formation of clouds from plumes. The comparison of the obtained results with previously published observational data indicates a reasonable agreement. The results can be useful for parameterization purposes. |
英文关键词 | Convective clouds Cumulus clouds Mixing |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000517328300002 |
WOS关键词 | THEORETICAL-ANALYSIS ; LIQUID CLOUDS ; SIZE DISTRIBUTIONS ; SUBSIDING SHELLS ; ENTRAINMENT ; PARAMETERIZATION ; MICROPHYSICS ; SATELLITE ; CCN ; SIMULATION |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/280304 |
专题 | 地球科学 |
作者单位 | Hebrew Univ Jerusalem, Dept Atmospher Sci, Jerusalem, Israel |
推荐引用方式 GB/T 7714 | Pinsky, M.,Khain, A.. Analytical Investigation of the Role of Lateral Mixing in the Evolution of Nonprecipitating Cumulus. Part I: Developing Clouds[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(3):891-909. |
APA | Pinsky, M.,&Khain, A..(2020).Analytical Investigation of the Role of Lateral Mixing in the Evolution of Nonprecipitating Cumulus. Part I: Developing Clouds.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(3),891-909. |
MLA | Pinsky, M.,et al."Analytical Investigation of the Role of Lateral Mixing in the Evolution of Nonprecipitating Cumulus. Part I: Developing Clouds".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.3(2020):891-909. |
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