【摘要】 本文利用美国NMC多年北半球夏季500hPa逐日高度场的经纬度网格点资料,计算了基点位于20°N,120°E的北半球夏季扰动高度场的点相关.计算结果表明,北半球夏季在南亚、东亚与北美地区存在着一个大气环流的遥相关型. 本文还计算了这个环流异常遥相关型的年际变化,计算结果表明这个遥相关型有很大的年际变化.1972/73年ENSO事件中,这个相关型尤其明显,而其它正常年份则不明显. 本文还利用IAP-GCM与1973年夏季实际的太平洋SST距平分布模拟了由于热带西太平洋海表温度升高而产生的北半球大气环流遥相关,其模拟结果与观测事实所得的结果相似.更多还原

【Abstract】 One-point correlation maps between 500 hPa disturbance height at the basic point 20°N, 120 °E and 500 hPa disturbance height at every other grid point are computed by using the observations of daily 500 hPa height field at the network points of longitude-latitude from NMC of the U.S.A. The computed results show that there is a teleconnection pattern in the atmospheric circulation anomalies in South Asia,East Asia and North America during the Northern Hemisphere Summer.Interannual variation of the teleconnection pattern is also computed. The results show that the interannual variation of the pattern is large. This pattern is obvious during the summers of the 1972/1973 ENSO event, and it is not obvious during other summers.In this paper, the IAP - GCM and the SST anomaly in the western tropical Pacific in the summer of 1973 are used to simulate the teleconnection of the summer circulation over the Northern Hemisphere due to the warming of SST in the western tropical Pacific.The simulated result is similar to the result obtained from the observational facts.更多还原