11-year satellite altimeter sea surface height (SSH) anomaly data from January 1993 to December 2003 are used to present the dominant spatial patterns and temporal variations of the South China Sea (SCS) surface circulation through Empirical Orthogonal Function (EOF) analysis. The first three EOF modes show the obvious seasonal variations of SSH in the SCS. EOF mode one is generally characterized by a basin-wide circulation. Mode two describes the double-cell basin scale circulation structure. The two cells were located off west of the Luzon Island and southeast of Vietnam, respectively. EOF mode three presents the mesoscale eddy structure in the western SCS, which develops into a strong cyclonic eddy rapidly from July to September. EOF mode one and mode three are also embedded with interannual signals, indicating that the SCS surface circulation variation is influenced by El Ni o events prominently. The strong El Ni o of 1997/98 obviously changed the SCS circulation structure. This study also shows that there existed a series of mesoscale eddies in the western SCS, and their temporal variation indicates intra-seasonal and in-terannual signals.
利用谐波分析、功率谱分析的方法，对全国730个站点自1951～2000年逐日降水资料进行气候平均分析，研究全国降水季节内振荡的分布特征。研究结果表明，中国大部分地区的降水主要以季节变化为主，而在长江中下游流域主要以季节内振荡为主。气候平均下降水的准双周振荡和Madden and Julian Oscillation（简称MJO）的振幅都在4月份开始加强，在11月份开始减弱，而MJO全年表现都很显著，准双周振荡主要在夏季显著；MJO主要分布在36°N以南的长江巾下游地区，准舣周振荡主要分布在115°E以西的内陆。
