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《SCIENTIA ATMOSPHERICA SINICA》 1996-01
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Instability of Inertia-Internal Gravity waves and Symmetric Instability in Circular Vortexes

Fei Jianfang and Lu Hancheng(Air Force Institute of Meteorology,Nanjing 211101)  
Inertia-gravitational instability and symmetric instability of the disturbance in circular atmospheric vortex systems are discussed by using linear perturbation equations in a two-dimensional axisymmetric cylindrical coordinate under Boussinesq approximation.When the environment is barotropic,the condition of instability of inertia-internal gravity waves is(μj/R0)2 N2+n2 F20.When the environment is baroclinic,the condition for development of inertia-gravity waves with parallel perturbation is Ri *1-[(3/2)+m]-2 which shows a symmetric instability.Instability of inertia-internal gravity waves and symmetric instability are the mechanisms for formation and development of the perturbation in circular vortexes such as typhoons and cyclones.
【Fund】: 国家自然科学基金
【CateGory Index】: P433
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