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DOI | 10.1175/JAS-D-19-0022.1 |
Nonsingular Zero-Order Bulk Models of Sheared Convective Boundary Layers | |
Haghshenas, Armin1; Mellado, Juan Pedro1,2; Hartmann, Moritz1 | |
2019-12-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:12页码:3697-3715 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany; Spain |
英文摘要 | Two zero-order bulk models (ZOMs) are developed for the velocity, buoyancy, and moisture of a cloud-free barotropic convective boundary layer (CBL) that grows into a linearly stratified atmosphere. The models differ in the entrainment closure assumption: in the first one, termed the "energetics-based model," the negative and positive areas of the buoyancy flux are assumed to match between the model and the actual CBL; in the second one, termed the "geometric-based model," the modeled CBL depth is assumed to match different definitions of the actual CBL depth. Parameterizations for these properties derived from direct numerical simulation (DNS) are employed as entrainment closure equations. These parameterizations, and hence the resulting models, are free from the potential singularity at finite wind strength that has been a major limitation in previous bulk models. The proposed ZOMs are verified using the DNS data. Model results show that the CBL depths obtained from the energetics-based model and previous ZOMs correspond to the height that marks the transition from the lower to the upper entrainment-zone sublayer; this reference height is few hundred meters above the height of the minimum buoyancy flux. It is also argued that ZOMs, despite their simplicity compared to higher-order models, can accurately represent CBL bulk properties when the relevant features of the actual entrainment zone are considered in the entrainment closures. The vertical structure of the actual entrainment zone, if required, can be constructed a posteriori using the available relationships between the predicted zero-order CBL depth and various definitions of the actual CBL depth. |
英文关键词 | Atmosphere Convection Entrainment Wind shear Boundary layer Mixed layer |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000497730200001 |
WOS关键词 | MIXED-LAYER ; ENTRAINMENT ZONE ; WIND-SHEAR ; PART I ; PARAMETERIZATION ; DYNAMICS ; INVERSION ; GROWTH ; JUMP ; PREDICTION |
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/226002 |
专题 | 环境与发展全球科技态势 |
作者单位 | 1.Max Planck Inst Meteorol, Hamburg, Germany; 2.Univ Politecn Cataluna, Div Aerosp Engn, Dept Phys, Barcelona, Spain |
推荐引用方式 GB/T 7714 | Haghshenas, Armin,Mellado, Juan Pedro,Hartmann, Moritz. Nonsingular Zero-Order Bulk Models of Sheared Convective Boundary Layers[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(12):3697-3715. |
APA | Haghshenas, Armin,Mellado, Juan Pedro,&Hartmann, Moritz.(2019).Nonsingular Zero-Order Bulk Models of Sheared Convective Boundary Layers.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(12),3697-3715. |
MLA | Haghshenas, Armin,et al."Nonsingular Zero-Order Bulk Models of Sheared Convective Boundary Layers".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.12(2019):3697-3715. |
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