【摘要】 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 ;反之 ,频率愈高 ,低频降水愈趋向于由高原向高原东侧和南侧传播。低频降水的传播路径倾向于与其上空 1 5 0 h Pa低频辐散带的传播路径相一致 ,但强度则不完全一致。高原中南部低频降水强度远大于高原北部 ,且与其周围平原和海洋地区的低频降水具有相对独立性更多还原

【Abstract】 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.The low frequency rainfall propagation trends to follow the path of propagation of the overhead low frequency divergence at 150 hPa.The intensity of low frequency rainfall,which is somewhat different from that of low frequency divergence,is far more strong over center and south of the plateau than over north of the plateau and is relatively independent of the plateau’s vicinities.更多还原