“珍珠”(0601)异常急翘路径和内核结构变化的诊断分析及数值研究  

A Diagnosis and Numerical Study of an Abrupt Recurved Typhoon Chanchu and Its Inner Core Structure Evolution

作　　者：李勋[1,2] 李泽椿 赵声蓉 曾智华[4] 王勇[1] 

机构地区：[1]南京信息工程大学,南京210044 [2]海南省气象台,海口570203 [3]国家气象中心,北京100081 [4]中国气象局上海台风研究所,中国气象局台风预报技术重点开放实验室,上海200030

出　　处：《气象》2010年第9期1-8,共8页Meteorological Monthly

基　　金：国家自然科学基金面上项目(40875039);国家自然科学基金重点项目(40730948);中国气象局上海台风研究所台风研究基金项目(2006STB07)共同资助

摘　　要：使用FY2卫星TBB资料、NCEP最终分析资料(1°×1°)和中尺度模式WRF,对0601号强台风"珍珠"的"急翘"异常转向路径和内核结构变化进行诊断分析和数值模拟。结果表明:"珍珠"移向变化与环境引导气流和位涡倾向1波分量正异常有关,"急翘"前12小时,环境引导气流向北偏转,位涡倾向1波分量正异常对应着"珍珠"移动方向变化;内核非对称结构发展与环境风垂直切变演变有关,垂直切变使得涡旋倾斜,涡旋倾斜方向出现较强的上升运动,导致"珍珠"内核偏南象限对流活动较强。The abrupt recurved severe typhoon Chanchu and its inner core structure evolution are documen- ted by using FY-2 TBB images, NCEP final analysis and the new generation mesoscale weather research and forecasting （WRF） model. Results show that the surrounding large-scale steering flow and potential vorticity tendency play important roles in Chanchu movement. The rightward deflection of Chanchu is indi- cated by the surrounding large-scale steering flow in advance. Chanchu is likely to move toward an area of maximum wavenumber-1 potential vorticity tendency. The evolution of inner core asymmetric structure is closely related to the environmental vertical wind shear. The shear-induced tilt of the vortex has a domi- nant influence on the maximum upward motion in the southerly quadrant of Chanchu.

关 键 词：热带气旋 异常路径 位涡倾向 涡旋倾斜 

分 类 号：P642.14[天文地球—工程地质学]