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DOI | 10.1029/2019JD032017 |
The Contributions of Shear and Turbulence to Cloud Overlap for Cumulus Clouds | |
Sulak, Anthony M.1,2,3; Calabrase, William J.1,4; Ryan, Shawn D.2; Heus, Thijs1 | |
2020-05-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES |
ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2020 |
卷号 | 125期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The causes of vertical cloud overlap, the ratio between the cloud fraction by area and the cloud fraction by volume, are studied for fields of cumulus convection. Using large-eddy simulations, the structure of individual clouds within the cloud field is inspected and connected to the overall cloud cover of the entire cloud field. First, it is shown that the cloud overlap of the entire field can be well approximated by the total cloud overlap of the individual clouds. It is then shown that a simple maximum overlap assumption, which is commonly used for cloud fields with small layer depth, can only account for roughly half of the overlap inefficiency. This is due to the fact that maximum overlap only represents variations in cloud width as a function of depth but does not take other factors into account, most notably shear or turbulence. The effects of turbulence and wind shear on the overlap of individual clouds are first estimated as a function of cloud depth, which closes the discrepancy between observed cloud overlap and the maximum overlap assumption. Then, an empirical model is developed for the shear and turbulence contributions on overlap as a function of cloud depth and of synoptic conditions. Finally, it is shown that our model is capable of accurately predicting overlap for a large number of cloud fields and under a variety of meteorological conditions. |
英文关键词 | Overlap Cumulus Parameterization Large Eddy Simulations |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000537788100011 |
WOS关键词 | LARGE-EDDY SIMULATION ; CONVECTION ; PARAMETERIZATION ; FRACTION |
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/280248 |
专题 | 气候变化 |
作者单位 | 1.Cleveland State Univ, Dept Phys, Cleveland, OH 44115 USA; 2.Cleveland State Univ, Dept Math & Stat, Cleveland, OH 44115 USA; 3.Michigan State Univ, Dept Math, E Lansing, MI 48824 USA; 4.Case Western Reserve Univ, Dept Phys, Cleveland, OH 44106 USA |
推荐引用方式 GB/T 7714 | Sulak, Anthony M.,Calabrase, William J.,Ryan, Shawn D.,et al. The Contributions of Shear and Turbulence to Cloud Overlap for Cumulus Clouds[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2020,125(10). |
APA | Sulak, Anthony M.,Calabrase, William J.,Ryan, Shawn D.,&Heus, Thijs.(2020).The Contributions of Shear and Turbulence to Cloud Overlap for Cumulus Clouds.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,125(10). |
MLA | Sulak, Anthony M.,et al."The Contributions of Shear and Turbulence to Cloud Overlap for Cumulus Clouds".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 125.10(2020). |
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