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DOI | 10.1175/JAS-D-18-0354.1 |
The Role of Wind Speed and Wind Shear for Banner Cloud Formation | |
Wirth, Volkmar1; Bubel, Pascal1; Eichhorn, Joachim1; Schoemer, Elmar1; Kremer, Tobias1; Erbes, Rainer1; Schappert, Sebastian2; Prestel, Isabelle3 | |
2020-04-01 | |
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:4页码:1199-1212 |
文章类型 | Article |
语种 | 英语 |
国家 | Germany |
英文摘要 | Banner clouds are clouds that appear to be attached to the leeward face of a steep mountain. This paper investigates the role of wind speed and wind shear for the formation of banner clouds. Large-eddy simulations are performed to simulate the flow of dry air past an idealized pyramid-shaped mountain. The potential for cloud formation is diagnosed through the Lagrangian vertical parcel displacement, which in the case of a banner cloud shows a plume of large values in the lee of the mountain. In addition, vortical structures are visualized through streamlines and their curvature. A series of sensitivity experiments indicates that both the flow and the banner cloud occurrence are largely independent of the ambient wind speed U. On the other hand, the shear of the ambient wind has a profound impact on the location of the stagnation point on the windward face as well as on the flow geometry in the lee of the mountain. The relevant measure for shear is H/H-s, where H denotes the height of the mountain and H-s = U/U-z is the scale height of the shear (with U-z denoting the scale of the shear). The simulations are also used to compute the line-of-sight velocity component seen by a hypothetical Doppler wind lidar positioned in the lee of the mountain; the analysis suggests that such sensitivities can potentially be detected using modern wind lidar technology. |
英文关键词 | Atmosphere Orographic effects Vertical motion Boundary layer Large eddy simulations Mountain meteorology |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000526685600002 |
WOS关键词 | FLOW ; DEFINITION ; BOUNDARY |
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/280311 |
专题 | 地球科学 |
作者单位 | 1.Johannes Gutenberg Univ Mainz, Mainz, Germany; 2.Deutsch Wetterdienst, Offenbach, Germany; 3.Carl von Ossietzky Univ Oldenburg, Oldenburg, Germany |
推荐引用方式 GB/T 7714 | Wirth, Volkmar,Bubel, Pascal,Eichhorn, Joachim,et al. The Role of Wind Speed and Wind Shear for Banner Cloud Formation[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(4):1199-1212. |
APA | Wirth, Volkmar.,Bubel, Pascal.,Eichhorn, Joachim.,Schoemer, Elmar.,Kremer, Tobias.,...&Prestel, Isabelle.(2020).The Role of Wind Speed and Wind Shear for Banner Cloud Formation.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(4),1199-1212. |
MLA | Wirth, Volkmar,et al."The Role of Wind Speed and Wind Shear for Banner Cloud Formation".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.4(2020):1199-1212. |
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