| GENERALIZED ENERGY CONSERVATION AND UNSTABLE
PERTURBATION PROPERTY IN BAROTROPIC VORTEX |
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| 作者姓名： | 黄泓 张铭 |
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| 作者单位： | Laboratory of Atmospheric Circulation and Short-range Climatic Prediction, Meteorological College, P.L.A.
University of Science and Engineering |
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| 基金项目： | Research on wave spectrum of Meso-beta-scale system and its application in severe weather
forecast, a project from National Natural Science Foundation of China (40575023) |
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| 摘 要： | Based on a barotropic vortex model, generalized energy-conserving equation was derived and two
necessary conditions of basic flow destabilization are gained. These conditions correspond to generalized
barotropic instability and super speed instability. They are instabilities of vortex and gravity inertial wave
respectively. In order to relate to practical situation, a barotropic vortex was analyzed, the basic flow of which is similar to lower level basic wind field of tropical cyclones and the maximum wind radius of which is 500 km.
The results show that generalized barotropic instability depending upon the radial gradient of relative vorticity
can appear in this vortex. It can be concluded that unstable vortex Rossby wave may appear in barotropic vortex.
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| 关 键 词： | instability barotropic vortex Spiral bands generalized energy conservation vortex Rossby wave |
GENERALIZED ENERGY CONSERVATION AND UNSTABLE
PERTURBATION PROPERTY IN BAROTROPIC VORTEX |
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| HUANG Hong and ZHANG Ming.GENERALIZED ENERGY CONSERVATION AND UNSTABLE
PERTURBATION PROPERTY IN BAROTROPIC VORTEX[J].Journal of Tropical Meteorology,2006,12(1):55-58. |
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| Authors: | HUANG Hong and ZHANG Ming |
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| Institution: | Laboratory of Atmospheric Circulation and Short-range Climatic Prediction, Meteorological College, P.L.A. University of Science and Engineering, Nanjing 211101 China |
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| Abstract: | Based on a barotropic vortex model, generalized energy-conserving equation was derived and two
necessary conditions of basic flow destabilization are gained. These conditions correspond to generalized
barotropic instability and super speed instability. They are instabilities of vortex and gravity inertial wave
respectively. In order to relate to practical situation, a barotropic vortex was analyzed, the basic flow of which is similar to lower level basic wind field of tropical cyclones and the maximum wind radius of which is 500 km.
The results show that generalized barotropic instability depending upon the radial gradient of relative vorticity
can appear in this vortex. It can be concluded that unstable vortex Rossby wave may appear in barotropic vortex. |
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| Keywords: | instability barotropic vortex Spiral bands generalized energy conservation vortex Rossby wave |
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