【摘要】 本文根据嘉兴市1953年～2003年逐年高温天数、夏季平均温度和夏季降水资料,分析了嘉兴近50a来的高温和夏季降水气候变化的统计特征,得出本市夏季气候年际差异显著,年代际变化较明显。通过对资料作小波分析发现高温和降水既有长期较稳定的年代际振荡,也存在有一定时限的高频振荡。将动态优势周期组合与实况进行对比,结果表明,极端气候事件往往发生在“特征值”高值附近且为几个不同周期振荡共同作用的结果。更多还原

【Abstract】 Statistical analysis and Morlet wavelet translation method have been used to analyze the number of annual high temperature days,summer average temperature and summer precipitation in Jiaxing city.The former shows the year-to-year difference is notable and decadal variety is also obvious.The latter deduces that high temperature and precipitation has both stable decadal change and high frequency oscillation.We compare combination of dynamic preponderant periods with real meteorological data ,and find that extreme climate events always occurred near the high eigenvalue and acted by several inter-period oscillation together.更多还原