It is found that there exist quasi 45 d,quasi 23 d and quasi 14 d low frequency precipitation over the plateau and that the lower of the frequency,the more likely of their propagation from south and east side of the plateau to the plateau itself,and v. v.

• 研究表明 ,准 45 d、准 2 3d和准 1 4d等 3类低频降水的频率愈低 ,低频降水愈趋向于从高原东侧和南侧向高原传播 ;