The Characteristics of Low Frequency Oscillation about Rainfall and Wind Disturbances over Eastern China
中国东部降水和风场的低频振荡特征

Main results obtained by the harmonic analysis and band-pass filter analysis show that the propagation of mean rainfall disturbances with about 90 -and 45 day oscillation is from the south to the north over inland and eastern coastal regions, but the propagation of the quasi-60-day oscillation is from the North and the South to the middle region of China. Between the Yangtze River and the Zhujiang River Valleys, mean rainfall disturbances with quasi-90 or 45 -day oscillation exhibit different propagating direction, but the quasi - 60 day oscillation is the same direction. In the meantime, we can see that the appearance of the heavy rain period in the summer over some regions of the eastern China is associated with, arrivals of positive rainfall disturbances. Besides, migration characteristics of u and v disturbances during April- September of 1978 are also discussed .