季节内西太平洋副高异常进退的诊断研究

DIAGNOSTIC STUDY OF INTRASEASONAL ANOMALOUS PROGRESSION AND RETROGRESSION OF SUBTROPICAL HIGH OVER WESTERN PACIFIC

采用ＥＣＭＷＦ１９８０年和１９８３年７、８月份逐日２．５°×２．５°网格点资料对两次季节内西太平洋副高的异常进退进行了诊断研究。揭示出：季节内西太平洋副高异常进退是整个北太平洋副高异常进退的结果；这种异常进退表现为东太平洋副高的活动，相应西太平洋副高也有一次活动过程，并表现为北太平洋地区存在一纬向波列，低频波沿此波列西传以实现东、西太平洋副高异常进退的遥相关关系；而东太平洋刻高的异常进退则是被南亚季风区到太平洋信风区的异常加热造成的东太平洋对流层上部辐散风场汇合下沉区的变化所激发。

By means of diagnostic study on two intraseasonal progressivel retrogressive processes of anomalous Subtropical High in West pacific using daily 2. 5°×2. 5°grid point data of ECMWF in Julies and Augusts, 1980 and 1983, a number of interesting facts are revealed. The anomalous progression and retrogression of this high is intraseasonally teleconnected with the one in the eastern Pacific, shown as low-frequency waves propagating westward along a latitudinal wave train across the northern Pacifici the same oscillatary displacement of the eastern Subtropical High is again triggered by the variation of convergent sink of upper tropospheric divergent wind field in the eastern Pacific, resulted from anomalous heating through the monsoon area in South Asia and trade-wind zone in the Pacific Ocean.