夏季多高温年和少高温年的前期环流特征

应用５００ｈＰａ月平均高度场资料，采用合成分析的方法，分析多高温年和少高温年前期环流的差异。结果表明，多高温年和少高温年的前期环流有明显的差异，主要表现在多高温年亚洲南部地区１－６月５００ｈＰａ高度场持续偏高，冬季表现出ＷＰ型遥相关特征，少高温年亚洲南部地区５００ｈＰａ高度场持续偏低，冬季西大西洋型遥相关明显；多高温年阿留申低压和阿拉斯加高压都偏强，反之则偏弱。７４项环流特征指数的分析表明，春季印

An Analysis of the Circulation Characteristics for the Previous Period in More High Temperature Year and Less High Temperature Year

The method of composite analysis is used to diagnose the deference of the circulation characteristics between the more high temperature year and the less high temperature year for the previous period by using 500 hPa data from 1951 to 1996. The results show that the deference is clear. In the more high temperature year, there are persistent positive anomalies in south of Asia from Jan. to June and the teleconnection over the West Pacific during the winter, and in the less high temperature year, anomalies in south of Asia are negative and the teleconnection over the West Atlantic is obvious. In April, Aleutial low and Alaska high are strong in the more high temperature year and they are week in the less high temperature year. The relationship between high temperature and 74 circulation indexes is analyzed. The results show that there are well positive correlation with the areas of subtropical high in Indian in spring and the position of subtropical high in the northern hemisphere in March, and the negative correlation with indexes of Eurasia longitude correlation in April and of East Asia trough's strength in Jan. and Apr. is notable.