湖北气温的3—5年周期振动及其与大气环流低频变化的联系

本文用月平均资料序列，提取湖北气温，北半球５００ｈＰａ高度和北太平洋海博温度的３－５年低频分量，分析研究了三者之间的联系，初步揭示了前期ＳＳＴ对湖北冬季气温影响的过程。

THE 3-5 YEAR FLUCTUATION OF TEMPERATURE IN HUBEI AND ITS ASSOCIATION WITH ATMOSPHERICAL LOW-FREQUENCY FLUCTUATION

Based on the monthly mean data, the characteristics of 3-5 year period of air temperature in Hubei Province and its association with 3 - 5 year low-frequency variation of the 500hpa height field in the Northern Hemisphere are analysed. It is shown that the 3- 5 year period fluctuation of interannual temperatUre variation is significant, and is related to 3 - 5 year fluctuation of N. H. 500hPa circulation. The relationship between the two 3- 5 year period components is closer than that between the two total amounts. It is also found the relationship between the interannual low-frequency variations of the temperature and teleconnections of the atmosphere is clear, particularly for the relationship between the air temperature in January and PNA anomaly. The correlation analySis betWeen the PNA index in Januny and the 3- 5 year SST fluctuation over the NOrthern Pacific shows that the SST anomaly can result in the anomalious PNA pattern of circulation over the Pacific-North America 3-4 months later, which Causes the air temperature anomaly in January over Hubei.