中国东部夏季雨带类型与前期北半球500 hPa环流异常的关系

根据1951～1986年的资料，在文献1]对中国东部夏季（6～8月）雨带分布类型的基础上，分析了各雨型与前期北半球500 hPa环流异常的关系。重点研究了各雨型的长期天气过程。发现不同雨型前期环流有不同的长期演变过程。指出中高纬和低纬环流不同季节变异及其相互作用，可能是导致中国东部各种雨带分布类型的一个重要因素。并提出了一些预报线索，可供夏季我国大范围旱涝趋势的长期预报参考。

Relationship between Summer Rainbelt Patterns in the Eastern China and 500 hPa Circulation Anomalies over the Northern Hemisphere

In this paper, on the basis of the classification of summer rainbelt distribution in the eastern China, we using 1951-1986 monthly 500 hPa height data over the Northern Hemisphere analyze the relationship of summer rainbelt patterns with 500 hPa circulation anomalies of the previous stage. Here we put more attention to their long-range weather processes, especially to the seasonal variation anomalies of atmospheric circulation. The summer rainbelt patterns are found to have quite different characteristics in the persistent anomalies and their evolution of 500 hPa circulation during the previous stage. It is pointed out that the anomalies of seasonal variations in atmospheric circulation over extratropical and tropical latitudes and their interaction may be the important factors resulting in various summer rainbelt patterns in the eastern China. These results may provide some useful indexes for the prediction of summer main rainbelt distributions in the eastern China.