Possible Ozone Influence on the Quasi-Biennial Oscillation in the Equatorial Stratosphere

摘要

Cross-spectral analysis between the time series of zonal wind velocity in the equatorial stratosphere and the flux of solar UV radiation revealed high coherence between the variations of these two parameters on a quasi-biennial scale (24-30 months) in the atmospheric layer 500-1 hPa (～6-48.5 km). A lag of the quasi-biennial variations in wind velocity behind the quasi-biennial variations in the solar radiation flux, the maximum (～ 24 months) of which is located at a level of 100 hPa (16.5 km), decreases with height, and in the stratopause region (～1 hPa), the wind velocity variations are approximately in phase with the variations in the solar radiation flux. This points at the possibility of the influence of quasi-biennial variations in the short-wave solar radiation on the quasi-biennial oscillation of the zonal wind in the neighborhood of the equatorial stratopause. It has been shown that the meridional gradient and the curvature degree of the meridional profile of ozone concentration in this layer undergo quasi-biennial variations such that could be a cause of synchronization between the quasi-biennial variations in the wind velocity and thermal variations according to the solar wind equation.