There are obviously intraseasonal oscillation(ISO) in WNP monsoon region,this climatological ISO is mainly composed of 30-60 and 10-20 day oscillation. But low-frequency oscillation of 30-60 days is significant.

• 西北太平洋季风区有明显的季节内振荡(ISO),这种气候的季节内振荡(CISO)主要由30~60 d与10~20 d两种周期组成,但是主要以30~60 d的低频振荡为主。