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DOI | 10.1175/JAS-D-18-0314.1 |
Theoretical Analysis of the Entrainment-Mixing Process at Cloud Boundaries. Part II: Motion of Cloud Interface | |
Pinsky, Mark; Khain, Alexander | |
2019-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:8页码:2599-2616 |
文章类型 | Article |
语种 | 英语 |
国家 | Israel |
英文摘要 | The entrainment-mixing process leads to formation of a cloud-environment interface zone, consisting of the cloud dilution zone, where the liquid water content decreases as the distance from the cloud interior increases, and a humid shell with higher humidity in comparison with the dry environment. The time evolution of the location and width of these zones is analyzed by solving the diffusion-evaporation equation for the open region in the vicinity of the cloud-dry air interface. Upon normalization, the problem is reduced to a one-parametric one, the governing parameter being the potential evaporation parameter R < 0, which is proportional to the ratio of saturation deficit in the dry air to the available liquid water content in the cloud air. It is shown that the widths of the dilution zone and the humid shell increase with time. At R < -1, the interface between the dilution zone and the humid shell (i.e., the cloud edge) moves toward the cloud interior (i.e., the cloud dissipates). If R > -1, the cloud edge moves outward; that is, the mixing leads to an increase in the cloud volume. It is shown that the relative humidity remains high within most of the cloud dilution zone, and the effective radius changes only slightly, especially in growing clouds, where the effective radius changes by less than 10% within more than 80% of the cloud dilution zone. The strong decrease in the LWC is accompanied by a corresponding decrease in the droplet concentration. The study is illustrated by means of two examples of clouds: a small cumulus (Cu) typical of the trade wind zone and a deep convective cloud typical of the monsoon period over India. It is shown that while the small Cu tends to dissipate, the deep convective cloud expands. The characteristic sizes of the dilution zone and the humid shell are several tens of meters for the small Cu and several hundred meters for the deep convective cloud. |
英文关键词 | Entrainment Clouds Cumulus clouds Mixing Evaporation |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000478876500001 |
WOS关键词 | SIZE DISTRIBUTIONS ; SUBSIDING SHELLS ; CUMULUS CLOUDS ; EVOLUTION ; CCN ; MICROPHYSICS ; SATELLITE ; POLLUTION ; MODEL |
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/185762 |
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, Mark,Khain, Alexander. Theoretical Analysis of the Entrainment-Mixing Process at Cloud Boundaries. Part II: Motion of Cloud Interface[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(8):2599-2616. |
APA | Pinsky, Mark,&Khain, Alexander.(2019).Theoretical Analysis of the Entrainment-Mixing Process at Cloud Boundaries. Part II: Motion of Cloud Interface.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(8),2599-2616. |
MLA | Pinsky, Mark,et al."Theoretical Analysis of the Entrainment-Mixing Process at Cloud Boundaries. Part II: Motion of Cloud Interface".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.8(2019):2599-2616. |
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