【摘要】 通过对东亚夏季风区域30年候降水量的分析研究可以看到,降水中30—60天低频振荡的季节变化与总的季风降水的季节变化具有明显的锁相关系,对季风雨带位置的出现起着重要的调制作用;降水低频振荡的年际变化对梅雨的年际变化也起着重要的调制作用;降水低频振荡呈现明显的由南向北的经向传播。更多还原

【Abstract】 By using the pentad rainfall over East Asia during the last thirty years, the low frequency oscillation of the summer monsoon rainfall over East Asia was inves -tigated. There is a phase locked relation between the seasonal variation of the low frequency oscillation (30- 60 day) and the seasonal variation of total rainfall. The 30 - 60 day oscillation of the monsoon rainfall and their interannual change modulate obviously the position of the monsoon rainband and the interannual change of the Meiyu, respectively. The low frequency oscillation of monsoon rainfall propagate in meridional direction from the south to the north.更多还原