Internal dynamics related to anomalies of seasonal evolution of summer circulations in East Asia during July-August
东亚地区夏季7～8月大气环流季节演变异常的内部动力学过程

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.