中文摘要：

利用NCEP／NCAR1958～1999年月平均再分析数据集，本文分析了7-8月东亚大气环流季节演变异常，包括提前和延迟这两种情形，及其与沿副热带西风急流的内部动力学过程的联系，比较了与气候季节演变进程的差异．结果表明，存在着两个地理位置固定的遥相关型，探讨了二者位相与副热带西风急流的关系，讨论了此类波列的出现与内部动力学过程的可能联系．

英文摘要：

Based on the NCEP/NCAR monthly reanalysis dataset of 1958 - 1999, anomalies of seasonal evolution of summer atmospheric circulation in East Asia in July and August, including advanced and delayed cases, and their relationships with the internal dynamical processes along the midsummer subtropical jet stream are analyzed and compared with those of the climatology. The results show that two geographically fixed teleconnection patterns exist and their phase related to the subtropical jet stream is confirmed. A possible linkage between the internal dynamics and the appearance of these wave trains is discussed.