中文摘要：

利用JRA逐日风场资料、NOAA/NCEP的逐日OLR场资料以及美国联合台风预报中心的热带气旋（TC）数据,通过对西北太平洋（WNP）上空10-20天大气准双周振荡（QBWO）不同位相的划分,深入分析了QBWO对WNP区域生成TC的调制作用。研究结果表明：在西北太平洋准双周尺度上,对流与纬向风表现出沿热带地区向西偏北传播的特性。不同位相合成的季风槽位置和强度也发生相应的改变,由此可见,QBWO是WNP上空季风槽季内变化的重要影响因子。当处于位相1、4时,WNP生成TC的概率较低,且登陆我国TC的数量也较少;当处于位相2、3时,WNP发生TC的概率较高,特别是处于位相3时,不仅TC发生概率最高,而且登陆我国的TC数量也最多。沿热带地区西传的天气尺度波动（周期10天以下）在WNP通过季风槽的纬向风辐合作用,易于转变为波数较大、波长较短的热带低压（TD）型扰动,这种扰动在季风槽区通过能量的转换有利于发展成为TC。

英文摘要：

This paper explores the modulation of quasi-biweekly oscillation （QBWO） on tropical cyclogenesis over the western North Pacific （WNP）, using the Japanese reanalysis （JRA） daily data, NOAA/NCEP data and tropical cyclones （TCs） dataset obtained from the Joint Typhoon Warming Center. Through the classification of four phases, the composites indicate that the zonal wind and convective activity on 10 - 20-day scale propagate northwestward. During phases 1 and 4, the number and the occurrence probability of the TCs are lower. In contrast, the number of the TCs is relatively large and the occurrence probability of the TCs is higher during phases 2 and 3. Moreover, during phase 3, the number of the TCs landing in China is largest. From phases 1 to 4, the location of monsoon trough shifts westward over the WNP. The westward-propagating synoptic-scale disturbances due to the convergence of zonal wind on the eastern flank of the monsoon trough over the WNP are prone to translating to TD-type （tropical depression-type） disturbances, which is favorable for developing into TC by means of kinetic energy conversion from basic state in the monsoon trough.