【摘要】 利用自然正交函数法展开多年平均的亚洲500毫巴候平均高度场和我国地面候平均温度场,对展开所得的前几个特征向量的时间系数的年变化曲线进行了分析,得出亚洲自然天气区域一年可分为春、初夏、盛夏、秋、前冬和后冬等六个自然天气季节的结论,确定了各自然天气季节的平均起迄时间和持续候数。对各季节内部的主要环流特征进行了天气统计学的分析。更多还原

【Abstract】 A series of five-day mean cirulation at the 500mb level over Asia and the mean temperature fields in China were expanded by the method of empirical orthogonal functions.The results from analyses of the annual variation of some first time co-efficients of EOF enable us to come to a conclusion that a year may be divided into six NSS, namely, spring, early summer, summer, autumn, early winter and winter The average division and duration of each NSS are then determined.A synoptic-statistical analysis was also made for the primary characteristics of circulation within NSS更多还原