【摘要】 根据英国的海平面气压 (SLP)资料计算了 1 873～ 1 95 0年东亚夏季风指数 (ISM)与用NCEP的SLP资料计算的 1 95 1～ 2 0 0 0年ISM衔接 ,构成 1 2 8年的ISM 序列。用功率谱及子波变换方法分析了ISM 的变化 ,指出 80年周期最突出 ,其次尚有 40年周期 ,8～ 1 0年周期及准 2年周期。分析表明 ,夏季风弱时中国东部夏季气温低 ,降水自北向南为负、正、负分布。夏季风强时 ,气温偏高 ,降水异常为正、负、正分布。对年际变化而言 ,降水与夏季风的关系要复杂一些 ,至少副热带高压的变化对降水也有重要作用更多还原

【Abstract】 Summer monsoon indices (I SM) for the period of 1873-2000 is calculated according to sea level pressure (SLP) data set provided by Meteorological Office of the United Kingdom and NCEP. Variability of I SM is examined by using of power spectrum analysis and wavelet transformation. It indicates that 80-a periodicity predominates over the whole period studied, but 40a, 8-10a and quasi-biennial oscillation can also be found in some time interval. Present time is being in the weak monsoon period. Summer temperature and precipitation anomaly maps for the period of 1881-1910, 1911-1940, 1941-1970 and 1971-2000 show that temperature was in general higher (lower)in east China, and precipitation was more (less) in the north and south while less (more) in the middle China when I SM was stronger (weaker) than the normal. On interannual time scale subtropical high can also influence on the precipitation distribution over east China.更多还原