中文摘要：

强热带风暴“碧利斯”（Bilis）于2006年7月14日12：50在福建省霞浦县北壁镇再次登陆,与南海季风相互作用,在福建省引发特大暴雨。作者利用双多普勒雷达三维风场反演技术对厦门和龙岩新一代多普勒雷达时间同步探测资料进行了风场反演,综合利用雷达回波强度资料,对造成长泰、漳州特大暴雨的中尺度对流系统的三维结构及其演变特征进行了详细分析。结果表明：（1）此次特大暴雨主要是由中低层西南-东北走向的β中尺度辐合线引发的,辐合线对于水汽输送以及暴雨的形成、触发、维持具有重要作用,辐合线在暴雨的整个生命史过程中经历了由弱变强、由强变弱的演变过程,变化过程与降水的强弱演变过程基本同步。（2）由于丰富的水汽供应和中低层辐合线的动力抬升作用,西南-东北走向的β中尺度回波带的西南不断有新的γ中尺度对流单体生成,在沿着辐合线向东北移动过程中进一步发展、合并形成β中尺度对流线,造成持续的强降水。最后,还给出了此次特大暴雨的三维云系结构模型。

英文摘要：

The severe tropical storm No. 0604 （Bilis） lands again on Beibi village of Xiapu, Fujian Province at 1250 LST 14 July 2006. It causes heavy rainfall in Fujian Province due to the interaction between the severe tropical storm and the South China Sea monsoon surge. The three-dimensional wind fields are retrieved from Xiamen and Longyan Doppler radar data using dual-Doppler radar wind retrieval technology. The 3D structure of the mesoscale convective system producing the most severe heavy rainfall at Changtai and Zhangzhou is analyzed with dual-Doppler radar retrieved wind and radar reflectivity observed by Xiamen Doppler radar. The dual-Doppler radar retrieved wind fields indicate that the SW- NE oriented mesoscale convergence lines at the lower and middle levels play an important role in the heavy rainfall. The convergence line is an important kinematic mechanism for the moisture transportation. It is quite important for the formation, breakout and maintenance of the heavy rainfall too. In the formation stage of the heavy rainfall, the convergence line evolves from weak to strong. On the other hand, the convergence line dissipates according as precipitation weakens. Due to the effect of the southwest moist flow and the mesoscale convergence line, meso-γ convective cells occur frequently in the southwest of the mesoscale convective echo band. These cells move in the SW to NE direction along the convergence line. The cells develop and merge to each other quickly. These mergences make the mesoscale convective system more strong. The mesoscale convective line and the cells embedded in it produce the severe rainfall at Changtai and Zhangzhou. The 3D dynamic conceptual model of the cloud system structure of the heavy rainfall is also proposed in this paper.