我国不同雨区的降水周期现象以及与夏季风的可能关系

OSCILLATION OF PRECIPITATION IN DIFFERENT RAINFALL AREAS OF CHINA AND ITS POSSIBLE RELATION WITH SUMMER MONSOON

摘要:

本文选1972、1979和1980年3年我国华南、西南地区以及长江流域夏季(6—8月)的逐日降水资料进行了谱分析,发现上述3地区的夏季降水都存在明显的准双周和单周周期振荡,分析了降水的周期振荡与夏季风之间的可能关系,并指出准双周现象的降水周期在我国传播的天气过程可能是西太平洋副热带高压的西伸北上的准双周变化。

Abstract:

Spectral analysis has been made of the daily precipitation from Juneto August of 1972, 1979 and 1980 in the South, the Southwest and theYangzi River valley of China. Quasi-two-week and one-week oscillations are obvious in these areas. Also, the possible relation between precipi-tatiun oscillation and summer monsoon has been analyzed, indicating thatthe weather process in which quasi-two-week oscillation propagates in China may be the quasi-two-week variation of the western extension and northward movement of the subtropical high.