MEDIUM-RANGE OSCILLATION OF A CONTINUOUS RAIN-CONTINUOUS FINE MARCH OVER MIDDLE AND LOWER REACHES OF THE CHANGJIANG RIVER IN SPRING

In this paper the results of a spectral analysis indicate that there seems to exist a quasi-biweekly oscillation in continuous rain-continuous fine march over middle and lower reaches of the Changjian River and in almost all of ten elements, which are defined from weather systems of westerly belt, of low latitude belt and of the Souther Hemisphere in spring of 1980.The relations of the march with elements and relative sequence of these oscillations are determined from a crosse-spectral analysis between Continuous rain-continuous fine march and ten elements. The results of a space-time spectral analysis indicate that there seems also to exist a quasibiweekly oscillation in progressive and retrogressive waves of zonal circulation and of meridional circulation. There are pronounced relations both between progressive waves of zonal circulation and progressive waves of meridional circulation, and between retrogressive waves of zonal circulation and retrogressive waves of meridional circulation. The propagate of disturbances along zonal circle lags behind along meridian circle. The disturbances are spacetime background of these oscillations.