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DOI | 10.1175/JAS-D-18-0133.1 |
The Boundary Layer Dynamics of Tropical Cyclone Rainbands | |
Kepert, Jeffrey D. | |
2018-11-01 | |
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:11页码:3777-3795 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia |
英文摘要 | Spiral bands are ubiquitous features in tropical cyclones and significantly affect boundary layer thermodynamics, yet knowledge of their boundary layer dynamics is lacking. Prompted by recent work that has shown that relatively weak axisymmetric vorticity perturbations outside of the radius of maximum winds in tropical cyclones can produce remarkably strong frictional convergence, and by the observation that most secondary eyewalls appear to form by the wrapping up of a spiral rainband, the effect of asymmetric vorticity features that mimic spiral bands is studied. The mass field corresponding to an axisymmetric vortex with added spiral vorticity band is constructed using the nonlinear balance equation, and supplied to a three-dimensional boundary layer model. The resulting flow has strong low-level convergence and a marked updraft extending along the vorticity band and some distance downwind. There is a marked along-band wind maximum in the upper boundary layer, similar to observations, which is up to about 20% stronger than the balanced flow. A marked gradient in the inflow-layer depth exists across the band and there is an increase in the surface wind factor (the ratio of surface wind speed to nonlinear-balanced wind speed) near the band. The boundary layer dynamics near a rainband therefore form a continuum with the flow near a secondary eyewall. None of these features are due to convective momentum transports, which are absent from the model. The sensitivities of the flow to band length, width, location, crossing angle, and amplitude are examined, and the possible contribution of boundary layer dynamics to the formation of the tropical cyclone rainbands discussed. |
英文关键词 | Hurricanes Boundary layer Hurricanes typhoons Tropical cyclones |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000448512700001 |
WOS关键词 | CONCENTRIC EYEWALL FORMATION ; VORTEX ROSSBY-WAVES ; PART II ; SECONDARY EYEWALL ; SPIRAL RAINBANDS ; NUMERICAL-SIMULATION ; POTENTIAL VORTICITY ; HURRICANE RITA ; WIND STRUCTURE ; CORE |
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/29556 |
专题 | 地球科学 |
作者单位 | Bur Meteorol, Melbourne, Vic, Australia |
推荐引用方式 GB/T 7714 | Kepert, Jeffrey D.. The Boundary Layer Dynamics of Tropical Cyclone Rainbands[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2018,75(11):3777-3795. |
APA | Kepert, Jeffrey D..(2018).The Boundary Layer Dynamics of Tropical Cyclone Rainbands.JOURNAL OF THE ATMOSPHERIC SCIENCES,75(11),3777-3795. |
MLA | Kepert, Jeffrey D.."The Boundary Layer Dynamics of Tropical Cyclone Rainbands".JOURNAL OF THE ATMOSPHERIC SCIENCES 75.11(2018):3777-3795. |
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