GSTDTAP  > 地球科学
DOI10.1175/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
ISSN0022-4928
EISSN1520-0469
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
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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
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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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