Intraseasonal oscillations and associated spatial-temporal structures of precipitation over China

On the basis of daily rainfall series for 122 stations well covering eastern China (east of 97 degrees E), intraseasonal oscillations of the monsoonal precipitation and the associated spatial-temporal structures were explored by performing multichannel singular spectrum analysis. Three oscillations with quasi-periods of 43, 21, and 12 days were found to be robust, being confined to the region south of 40 degrees N latitude. The spatial-temporal structures, i.e., the propagation of rainfall anomalies, associated with these quasi-periodicities are presented. Also, some information about the amplitudes of these oscillations is provided by using composite analysis.