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DOI | 10.1175/JAS-D-18-0191.1 |
Barotropic Instability across the Moat and Inner Eyewall Dissipation: A Numerical Study of Hurricane Wilma (2005) | |
Lai, Tsz-Kin; Menelaou, Konstantinos; Yau, M. K. | |
2019-04-01 | |
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:4页码:989-1013 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Radar imagery of some double-eyewall tropical cyclones shows that the inner eyewalls become elliptical prior to their dissipation. These elliptical features indicate that the barotropic instability (BI) across the moat (aka, type-2 BI) may play a role in the process. To investigate the mechanism for dissipation, a WRF simulation of Hurricane Wilma (2005) is performed. The results reveal an elliptical elongation of the inner eyewall and a change in the structure of the radial flow from wavenumber (WN) 1 to WN 2 at the lower levels. A linear stability analysis as well as idealized nonlinear experiments using a nondivergent barotropic vorticity model initialized with the vorticity fields before the change in the dominant wavenumber of the radial flow are presented with the results supporting the presence of a type-2 BI at the lower levels. The accompanying WN-2 radial flow is also found to dilute the vorticity within the inner eyewall and the eye. However, this dilution is not seen at higher levels as the type-2 BI becomes weak and short lived at the middle levels and reaches its weakest strength at the upper levels. This phenomenon is traced to the fact that a higher growth rate comes with a narrower moat for type-2 BI. As the outward slope of the outer eyewall is larger than that of the inner eyewall, the moat width increases with height so that the growth rate decreases with height. The results presented here thus highlight the potential role played by the barotropic instability across the moat in inner eyewall dissipation. |
英文关键词 | Atmosphere Atlantic Ocean Hurricanes Hurricanes typhoons Tropical cyclones Numerical analysis modeling |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000462356700002 |
WOS关键词 | INSTRUMENT WETTING ERRORS ; SECONDARY WIND MAXIMA ; TROPICAL CYCLONE ; POTENTIAL VORTICITY ; PART II ; TROCHOIDAL MOTION ; INTENSITY CHANGE ; MODEL ; DYNAMICS ; VORTEX |
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/182164 |
专题 | 地球科学 |
作者单位 | McGill Univ, Dept Atmospher & Ocean Sci, Montreal, PQ, Canada |
推荐引用方式 GB/T 7714 | Lai, Tsz-Kin,Menelaou, Konstantinos,Yau, M. K.. Barotropic Instability across the Moat and Inner Eyewall Dissipation: A Numerical Study of Hurricane Wilma (2005)[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(4):989-1013. |
APA | Lai, Tsz-Kin,Menelaou, Konstantinos,&Yau, M. K..(2019).Barotropic Instability across the Moat and Inner Eyewall Dissipation: A Numerical Study of Hurricane Wilma (2005).JOURNAL OF THE ATMOSPHERIC SCIENCES,76(4),989-1013. |
MLA | Lai, Tsz-Kin,et al."Barotropic Instability across the Moat and Inner Eyewall Dissipation: A Numerical Study of Hurricane Wilma (2005)".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.4(2019):989-1013. |
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