Relationships of precipitation from June to September in Dalian with PDO and ENSO

Based on the Pacific Decade Oscillation(PDO) data and El Nino Southern Oscillation(ENSO) data as well as precipitation data from June to September in Dalian from 1905 to 2006,the relationships among them were analyzed.The results show that precipitation from June to September in Dalian is less than the normal average during the warm phase of PDO,and it is more than the normal average during the cold phase of PDO.There is a quasi-period between PDO and precipitation from June to September in Dalian.The corresponding precipitation anomaly from June to September in Dalian takes on a decreasing tendency by 8 years moving average from the cold phase to the warm phase of PDO.The effects of ENSO on precipitation from June to September in Dalian are controlled by PDO.Precipitation from June to September is more than the normal average in ENSO year during the cold phase of PDO,while it is contrary during the warm phase of PDO.The effects of different intensities and different ENSO on precipitation from June to September are different during the different phases of PDO.