中文摘要：

利用1958—2005年（共48年）有关南海西沙群岛的气象资料与ENSO观测资料,从气温、降雨、台风3个方面研究南海西沙群岛海域气候异常与ENSO事件之间的关系。结果表明,南海西沙群岛海域气候异常与ENSO事件存在非常密切的关系,具体表现如下。气温方面,南海西沙群岛海域逐月气温距平百分率与月ENSO指数存在显著的统计正相关关系,在厄尔尼诺期间一般表现为气温偏高（正距平）,拉尼娜期间则相反;功率谱分析显示该地区气温异常存在明显的周期性,并且周期与ENSO事件的周期非常一致。降雨方面,年平均ENSO指数与西沙群岛海域年降水量存在显著负相关,典型拉尼娜年的降雨量比厄尔尼诺年多约50%。台风方面,ENSO指数与到达该地区的热带气旋频次存在显著的统计负相关关系,在厄尔尼诺期间的热带气旋频次比拉尼娜期间明显要少。

英文摘要：

The authors investigate the relationship between ENSO events and regional climate anomalies around the Xisha Islands during the last 50 years.They find that there is evident correlation between ENSO events and the regional climate anomalies.There is a significant positive correlation between air-temperature anomalies and ENSO index（MEI）.Power spectral analysis shows that the temperature anomalies have similar cycles to the ENSO index.Regarding to rainfall,the annual precipitation in La Nia years is much more than that in El Nio years.As to tropical cyclone,its frequency during El Nio is significantly lower than that during La Nia.