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DOI | 10.1175/JAS-D-19-0118.1 |
Analytical Investigation of the Role of Lateral Mixing in the Evolution of Nonprecipitating Cumulus. Part II: Dissolving Stage | |
Pinsky, M.; Khain, A. | |
2020-03-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:3页码:911-924 |
文章类型 | Article |
语种 | 英语 |
国家 | Israel |
英文摘要 | A minimalistic analytical model allowing analysis of the dissolving stage of nonprecipitating convective clouds is proposed. The model takes into account two mechanisms: turbulent mixing with a dry environment and cloud volume settling. The temporal changes in the spatial structure of a cloud and in its immediate environment in the course of cloud dissolving are analyzed. The comparison of the effects of a temperature increase in the course of cloud descent and mixing with dry surrounding air shows that the descent is a dominating factor determining a decrease in the liquid water content (LWC), while mixing has a stronger effect on the cloud shape. Narrowing/broadening of clouds due to lateral mixing with dry air during cloud dissolving is determined by the potential evaporation parameter proportional to the ratio of the saturation deficit in the cloud environment to LWC. An equation for cloud dissolving time is obtained. After a cloud totally dissolves, it leaves behind an area with humidity exceeding that of the environment. The main parameter determining the dissolving time is the downdraft velocity. It should exceed 50 cm s(-1) in order to provide reasonable dissolving time. The turbulent intensity, LWC, and humidity of the environment air also have an impact on dissolving time: the lower the LWC and the humidity of environment air, the faster cloud dissolving is. The simple solution presented in this paper can be useful for evaluation of cloud characteristics at the dissolving stage and can be included in procedures of parameterization of cloud cover formed by nonprecipitating or slightly precipitating cumulus clouds (Cu). Values of the environment humidity and temperature, LWC at cloud top, cloud width, vertical velocity of downdraft, and the turbulent coefficient should be parameters of this parameterization. |
英文关键词 | Clouds Mixing Clouds Cumulus clouds Single column models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000517328300003 |
WOS关键词 | THEORETICAL-ANALYSIS ; LIQUID CLOUDS ; ENTRAINMENT ; MICROPHYSICS ; MODEL ; PARAMETERIZATION ; 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/280305 |
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 II: Dissolving Stage[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(3):911-924. |
APA | Pinsky, M.,&Khain, A..(2020).Analytical Investigation of the Role of Lateral Mixing in the Evolution of Nonprecipitating Cumulus. Part II: Dissolving Stage.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(3),911-924. |
MLA | Pinsky, M.,et al."Analytical Investigation of the Role of Lateral Mixing in the Evolution of Nonprecipitating Cumulus. Part II: Dissolving Stage".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.3(2020):911-924. |
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