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《Chinese Journal of Atmospheric Sciences》 1987-03
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THE 40-50 DAY LOW-FREQUENCY OSCILLATION OF THE ZONAL MEAN FLOW AND ITS DESTABILIZING EFFECT

Zhang Kesu(Institute of Atmospheric Physics, Academia sinica)  
A preliminary data analysis reveals that the 40-50 day low-frequency oscillation of the atmospheric motion exists not only in the tropical troposphere, but also in the extratropical troposphere and the stratosphere. It is also indicated that the 40-50 day oscillations are more significant than 2-week oscillations in the power spectra of temperature and geopotential heights.The stability analysis is performed by using a 2-level model of spherical coordinates for the winter tropospheric zonal mean flow oscillating with time. The results show that the growth sates of the small perturbations increase in the presence of the oscillation of the basic flow. The 40-50 day oscillation of the meridional temperature gradient produces a significant distabi-lizing effect for wavenumber m = 3-8. The frequency response of the growth rates also exhibits a "saturation" phenomenon when the periods of oscillation are further increased.The stability analysis of the stratosphere shows that the stationary zonal mean flow is dynamically stable while the time oscillation of the basic flow and its zonal distortion are two significant factors which may destabilize the basic flow.
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