太平洋海-气热通量与长江流域降水及东亚500hPa环流的遥相关

Teleconnection between Air-Sea Heat Flux over the Pacific and Precipitation over the Yangtze River Valley and 500 hPa Circulation over East Asia

本文采用对两种气象要素场的相关场作EOF分解的方法，对1951－1979年太平洋海-气感热、潜热通量与长江流域降水和东亚500hPa环流作了分析。结果表明，太平洋海-气感热、潜热通量与后期（τ=6）长江流域降水存在显著相关区，感热和潜热的异常分布能造成长江流域降水分布不均。同时，冬季（12－2月）太平洋潜热通量的变化与夏季（6－8月）对流层中层的赤道辐会带、副热带高压等系统有较密切的联系。

In this paper.the EOF technique is utilized to analyze the field of time cross-correlationcoefticients between two meteorological fields, such as the correlations between the air-sea latent andsensible heat flux in the Pacific and the precipitation over the Yangtze River valley and the 500 hPa cir-culation in the period of 1951-1979.The results show that there exists teleconnectionship between thesensible and latent heat flux in the Pacific and the precipitation over the Yangtze River valley for thelags (τ=6). The anomalies of the latent and sensible heat flux in the eastern equatorial Pacific may causethe uneven distribution of precipitation over the above mentioned area.Moreover, the variations of la-tent heat flux in the winter (DJF) are also associated with the variations of equatorial convergence belt,subtropical anticyclone etc. over the mid-troposphere in the summer (JJA).