Rossby参数<i>β</i>在涡旋Rossby波中的作用

邓莲堂; 刘式适; 徐祥德; 付遵涛

Rossby参数β在涡旋Rossby波中的作用

1.
国家气象中心, 北京, 100081
2.
北京大学物理学院大气科学系, 北京, 100871
3.
中国气象科学研究院, 北京, 100081

基金项目: 科技部社会公益研究专项基金(No.2001 DIA 20026)资助

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出版历程
- 收稿日期: 2003-05-28
- 修回日期: 2003-08-26

THE EFFECT OF ROSSBY PARAMETER IN VORTEX ROSSBY WAVES

1.
National Meteorological Center, Beijing 100081, China
2.
School of Physics, Peking University, Beijing 100871, China
3.
Chinese Academy of Meteorological Sciences, Beijing 100081, China

摘要

摘要: 利用尺度分析方法得到Rossby参数β在强涡旋中有着不可忽略的作用。在无基本气流径向切变的涡旋系统中,在Rossby参数β的作用下有涡旋Rossby波出现。由于涡旋Rossby波存在,从而破坏了涡旋系统的轴对称性,表现出非轴对称特征。在考虑切向基本气流的涡度径向变化时,涡旋Rossby波的频散关系同时包含了切向基本气流涡度径向切变项和β项的作用。一般情况下涡旋Rossby波在切向基本气流涡度径向切变的作用下有向外频散能量的特性,而β项的作用随方位角θ而变化,使涡旋能量频散不对称。
- 涡旋Rossby波 /
- Rossby参数 /
- 径向切变 /
- 非对称性
Abstract: Applying the scale analysis method, analysis of the Rossby parameter β effect which couldn't be neglected in the strong vortex is presented. It is shown that the action of Rossby parameter β can generate the vortex Rossby waves in strong cyclonic vortices withthe constant basic-state angular wind. The presence of the vortex Rossby waves generates the asymmetry of the vortex weakening the vortex axisymmetric structure. If one considers the radial variation of the basic-state angular wind, then the dispersion relation of the vortex Rossby waves contains the radial gradient term of the basic-state angular wind's vorticity and β term. The vortex Rossby waves always propagate outward in the presence of the radialshear of the basic-state angular wind, while the effect of the β term, which varies with the azimuthal angel θ, disperses the energy of the vortex system asymmetrically.
- vortex Rossby waves /
- Rossby parameter /
- tangential shear /
- asymmetry

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参考文献(27)

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