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DOI | 10.1175/JAS-D-17-0091.1 |
Tilting of Horizontal Shear Vorticity and the Development of Updraft Rotation in Supercell Thunderstorms | |
Dahl, Johannes M. L. | |
2017-09-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:9 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | The question of how rotation arises in sheared updrafts is analyzed using the shear and curvature vorticity framework. Local rotation exists where the shear and curvature vorticity have a similar magnitude and the same sign, such that parcels are in near-solid-body rotation. It is shown that the tilting terms of the vertical vorticity equation cannot explain the development of local rotation in the canonical cases where the horizontal vorticity is either purely streamwise or purely crosswise. Rather, vertical shear vorticity develops if crosswise vorticity is tilted, and vertical curvature vorticity develops if streamwise vorticity is tilted. To analyze how local rotation develops, two simulations of updrafts in an environment with crosswise and mostly streamwise vorticity, respectively, are discussed. A trajectory analysis is performed and shear and curvature vorticity budgets are analyzed. It is found that much of the horizontal vorticity near the updraft becomes streamwise, which results from pressure gradient accelerations in the vicinity of the updraft. Consequently, in the analyzed scenarios, the tilting mechanism results primarily in vertical curvature vorticity. Local rotation is achieved via an interchange process that facilitates a partial conversion of vertical curvature vorticity to vertical shear vorticity. Updraft rotation in supercells thus does not result from tilting of horizontal vorticity alone, but partial conversion of curvature to shear vorticity is also required. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000409847100016 |
WOS关键词 | VERTICAL WIND SHEAR ; SIMULATED SUPERCELLS ; CURVATURE VORTICITY ; CONVECTIVE STORMS ; NUMERICAL-SIMULATION ; ENVIRONMENTS ; PROPAGATION ; EVOLUTION ; VORTEX ; 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/29687 |
专题 | 地球科学 |
作者单位 | Texas Tech Univ, Dept Geosci, Atmospher Sci Grp, Lubbock, TX 79409 USA |
推荐引用方式 GB/T 7714 | Dahl, Johannes M. L.. Tilting of Horizontal Shear Vorticity and the Development of Updraft Rotation in Supercell Thunderstorms[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(9). |
APA | Dahl, Johannes M. L..(2017).Tilting of Horizontal Shear Vorticity and the Development of Updraft Rotation in Supercell Thunderstorms.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(9). |
MLA | Dahl, Johannes M. L.."Tilting of Horizontal Shear Vorticity and the Development of Updraft Rotation in Supercell Thunderstorms".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.9(2017). |
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