Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-17-0174.1 |
Effects of the Low-Level Wind Profile on Outflow Position and Near-Surface Vertical Vorticity in Simulated Supercell Thunderstorms | |
Guarriello, Felicia1,2,3; Nowotarski, Christopher J.1; Epifanio, Craig C.1 | |
2018-03-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:3页码:731-753 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Supercell thunderstorms are simulated using an idealized numerical model to analyze the effects of modifications to the environmental low-level wind profile on near-surface rotation. Specifically, the orientation, magnitude, and depth of the low-level vertical wind shear are modified in several suites of experiments and compared to control simulations with no vertical wind shear in the prescribed layer. The overall morphology of the simulated supercells is highly sensitive to even shallow changes in the low-level wind profile. Moreover, maximum near-surface vertical vorticity varies as the low-level wind profile is modified. The results suggest this is principally a consequence of the degree to which favorable dynamic forcing of negatively buoyant outflow is superimposed upon the near-surface circulation maximum. Simulations with easterly shear and weaker storm-relative winds over the depth of the gust front promote forward-surging outflow and smaller separation between the near-surface circulation maximum and the mesocyclone aloft compared with other hodograph shapes. This promotes near-surface vertical vorticity intensification in these simulations. Similar trends in near-surface vertical vorticity as a function of low-level shear orientation are observed for varying shear-layer depths and bulk-shear magnitudes over the shear layer. The degree to which specific hodograph shapes promote strong near-surface rotation may vary with different deep-layer wind profiles or thermodynamic environments from those simulated here; however, this study concludes that favorable positioning of the near-surface circulation maximum and mesocyclone aloft are a necessary condition for supercell tornadogenesis and this positioning may be modulated by the low-level wind profile. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000429576900002 |
WOS关键词 | REAR-FLANK DOWNDRAFTS ; RAPID UPDATE CYCLE ; PART I ; IDEALIZED SIMULATIONS ; PROXIMITY SOUNDINGS ; TORNADIC SUPERCELLS ; DENSITY CURRENTS ; DUAL-DOPPLER ; SQUALL LINES ; SHEAR 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/29391 |
专题 | 地球科学 |
作者单位 | 1.Texas A&M Univ, Dept Atmospher Sci, College Stn, TX 77843 USA; 2.KBRwyle, Silver Spring, MD USA; 3.NOAA, Silver Spring, MD USA |
推荐引用方式 GB/T 7714 | Guarriello, Felicia,Nowotarski, Christopher J.,Epifanio, Craig C.. Effects of the Low-Level Wind Profile on Outflow Position and Near-Surface Vertical Vorticity in Simulated Supercell Thunderstorms[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(3):731-753. |
APA | Guarriello, Felicia,Nowotarski, Christopher J.,&Epifanio, Craig C..(2018).Effects of the Low-Level Wind Profile on Outflow Position and Near-Surface Vertical Vorticity in Simulated Supercell Thunderstorms.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(3),731-753. |
MLA | Guarriello, Felicia,et al."Effects of the Low-Level Wind Profile on Outflow Position and Near-Surface Vertical Vorticity in Simulated Supercell Thunderstorms".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.3(2018):731-753. |
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