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DOI | 10.1175/JAS-D-17-0341.1 |
Spontaneous Emission of Spiral Inertia-Gravity Waves and Formation of Elliptical Eyewalls in Tropical Cyclone-Like Vortices: Three-Dimensional Nonlinear Simulations | |
Menelaou, Konstantinos; Yau, M. K. | |
2018-08-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2018 |
卷号 | 75期号:8页码:2635-2658 |
文章类型 | Article |
语种 | 英语 |
国家 | Canada |
英文摘要 | Although intense tropical cyclones (TCs) are considered to be axisymmetric vortices, observations reveal that they are often highly asymmetric. Better understanding of the underlying asymmetric dynamics is a critical step toward advancing TC intensity forecasting. In this paper, we revisit the mechanisms behind one of the most frequent asymmetric patterns: the deformation of the core into an elliptical shape. Previously, elliptical eyewalls were primarily thought to be an outcome of barotropic instability, a mechanism that involves the coupling and mutual growth of counterpropagating vortex Rossby (VR) waves. These results were largely based on simplified numerical models that filter out inertia-gravity (IG) waves. Consideration of IG waves introduces the possibility of an additional instability mechanism, one that involves a VR wave that spontaneously emits a spiral IG wave into the environment. We provide evidence that elliptical eyewalls, which may form within a three-dimensional primitive-equation nonlinear model that supports both instability types, can solely originate by the mechanism of spontaneous radiative imbalance. These evidences are supported by a number of nonlinear simulations, supplemental linear eigenmode analysis, and a linear simulation. The potential role of a multimechanistic instability is also briefly addressed. |
英文关键词 | Hurricanes Instability Mesoscale systems |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000439546900001 |
WOS关键词 | POTENTIAL VORTICITY ; PART II ; HURRICANE ; VORTEX ; EYE ; INSTABILITY ; EVOLUTION |
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/29200 |
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 | Menelaou, Konstantinos,Yau, M. K.. Spontaneous Emission of Spiral Inertia-Gravity Waves and Formation of Elliptical Eyewalls in Tropical Cyclone-Like Vortices: Three-Dimensional Nonlinear Simulations[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(8):2635-2658. |
APA | Menelaou, Konstantinos,&Yau, M. K..(2018).Spontaneous Emission of Spiral Inertia-Gravity Waves and Formation of Elliptical Eyewalls in Tropical Cyclone-Like Vortices: Three-Dimensional Nonlinear Simulations.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(8),2635-2658. |
MLA | Menelaou, Konstantinos,et al."Spontaneous Emission of Spiral Inertia-Gravity Waves and Formation of Elliptical Eyewalls in Tropical Cyclone-Like Vortices: Three-Dimensional Nonlinear Simulations".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.8(2018):2635-2658. |
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