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DOI | 10.1175/JAS-D-16-0227.1 |
The Possible Role of Density Current Dynamics in the Generation of Low-Level Vertical Vorticity in Supercells | |
Houston, Adam L. | |
2017-10-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2017 |
卷号 | 74期号:10 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Aphysical mechanism based on density current dynamics is proposed to explain the generation of low-level vertical vorticity in supercells. This mechanism may serve as one explanation for the associative relationship between environmental low-level vertical shear and the occurrence of significant tornadoes. The mechanism proposed herein represents an indirect connection to the generation of strong surface-based rotation: the barotropic horizontal vorticity associated with the vertical shear acts to amplify existing rotation but does not directly contribute to surface rotation. The proposed mechanism couples the likelihood of a tornado to the vertical shear through the pattern of vertical motion induced through interaction of a deformed gust front and the environmental vertical shear. Results from the experiments conducted to test the veracity of the proposed mechanism illustrate that inferred patterns of tilting and vortex line orientation are consistent with the generation of positive vertical vorticity near the axis of the existing mesocyclone and negative vertical vorticity along the rear-flank gust front. Moreover, inferred tilting is found to scale with the magnitude of the environmental vertical shear, consistent with the climatologies that motivate this work. Experiments also reveal that the proposed mechanism is capable of relating boundary deformation, mesocyclone strength, and hodograph shape to the ultimate likelihood of tornadogenesis. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000411637700004 |
WOS关键词 | LOW-SHEAR ENVIRONMENT ; DEEP CONVECTION ; WIND SHEAR ; TORNADOGENESIS ; PROPAGATION ; HELICITY ; OUTBREAK ; MOTION ; FLOWS |
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/29275 |
专题 | 地球科学 |
作者单位 | Univ Nebraska Lincoln, Dept Earth & Atmospher Sci, Lincoln, NE 68588 USA |
推荐引用方式 GB/T 7714 | Houston, Adam L.. The Possible Role of Density Current Dynamics in the Generation of Low-Level Vertical Vorticity in Supercells[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2017,74(10). |
APA | Houston, Adam L..(2017).The Possible Role of Density Current Dynamics in the Generation of Low-Level Vertical Vorticity in Supercells.JOURNAL OF THE ATMOSPHERIC SCIENCES,74(10). |
MLA | Houston, Adam L.."The Possible Role of Density Current Dynamics in the Generation of Low-Level Vertical Vorticity in Supercells".JOURNAL OF THE ATMOSPHERIC SCIENCES 74.10(2017). |
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