台风“达维”进入渤海后定位、路径及强度分析

为了研究北上台风的移动路径特点、台风中心的定位方法以及产生台风暴雨的主要影响因子，利用辽宁省热带气旋历史资料库检索系统及卫星、高空和地面的实况资料，分析2012 年第10 号台风“达维”进入渤海后的定位、路径和强度变化及其在天气学和动力学角度的成因。结果表明：（1）当台风云系不显著时，台风中心位置可以通过地面风场出现气旋性的辐合流场，同时配合流场内出现的低气压区来主观定位；（2）台风“达维”的路径变化一方面受到中高纬度西风槽与之相互牵引并结合的影响，另一方面副高南侧的双台风系统加强了副高西南侧的急流带，“达维”的移动路径主要受副高边缘流场影响；（3）低海温及低层冷空气入侵是“达维”强度减弱的2个主要因素。

Features on Location, Track and Intensity of Typhoon Damrey After It Entering into Bohai Sea

The study aims to identify the characteristics of the path of typhoon northward, the method to locate typhoon center and the major factors of storms caused by typhoon. Based on historical database retrieval system as well as high level and surface data, the author analyzed features of the location, track and intensity changes of typhoon Damrey after it entered into Bohai sea and its synoptic and dynamic mechanism. Results showed that: (1) typhoon center location could be subjectively determined by surface wind convergence along with depression when typhoon cloud was not significant; (2) Track of typhoon Damrey was influenced, on one hand by interaction and combination with westerly trough in mid and high latitudes, and on the other hand by jet stream over the southwest side of subtropical high (SH), which was enhanced by the binary typhoons on the south side of SH, and the path of typhoon Damrey was mainly affected by the edge flow of SH; (3) Damrey was mainly weakened by low SST and invasion of lower level cold air.