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DOI | 10.1175/JAS-D-18-0104.1 |
On the Creation and Evolution of Small-Scale Low-Level Vorticity Anomalies during Tropical Cyclogenesis | |
Smith, Warren P.; Nicholls, Melville E. | |
2019-08-01 | |
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:8页码:2335-2355 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | Recent numerical modeling and observational studies indicate the importance of vortical hot towers (VHTs) in the transformation of a tropical disturbance to a tropical depression. It has recently been recognized that convective-scale downdraft outflows that form within VHTs also preferentially develop positive vertical vorticity around their edges, which is considerably larger in magnitude than ambient values. During a numerical simulation of tropical cyclogenesis it is found that particularly strong low-level convectively induced vorticity anomalies (LCVAs) occasionally form as convection acts on the enhanced vorticity at the edges of cold pools. These features cycle about the larger-scale circulation and are associated with a coincident pressure depression and low-level wind intensification. The LCVAs studied are considerably deeper than the vorticity produced at the edges of VHT cold pool outflows, and their evolution is associated with persistent convection and vortex merger events that act to sustain them. Herein, we highlight the formation and evolution of two representative LCVAs and discuss the environmental parameters that eventually become favorable for one LCVA to reach the center of a larger-scale circulation as tropical cyclogenesis occurs. |
英文关键词 | Cold pools Convection Convective-scale processes Hurricanes Cloud resolving models Numerical analysis modeling |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000475399700005 |
WOS关键词 | CLOUD MICROPHYSICS PARAMETERIZATION ; WAVE CRITICAL LAYER ; NUMERICAL-SIMULATION ; POTENTIAL-VORTICITY ; VORTEX MERGER ; 2 DIMENSIONS ; GENESIS |
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/185750 |
专题 | 地球科学 |
作者单位 | Univ Colorado, Cooperat Inst Res Environm Sci, Dept Atmospher & Ocean Sci, Boulder, CO 80309 USA |
推荐引用方式 GB/T 7714 | Smith, Warren P.,Nicholls, Melville E.. On the Creation and Evolution of Small-Scale Low-Level Vorticity Anomalies during Tropical Cyclogenesis[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(8):2335-2355. |
APA | Smith, Warren P.,&Nicholls, Melville E..(2019).On the Creation and Evolution of Small-Scale Low-Level Vorticity Anomalies during Tropical Cyclogenesis.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(8),2335-2355. |
MLA | Smith, Warren P.,et al."On the Creation and Evolution of Small-Scale Low-Level Vorticity Anomalies during Tropical Cyclogenesis".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.8(2019):2335-2355. |
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