摘要
应用天气学与动力学相结合的方法,分析发现:鞍型场、西风槽和双热带气旋形势是热带气旋移速突变的环流背景。在上述环流背景的条件下,涡度、涡度平流、流函数、850—200hPa垂直切变以及不对称配置的演变与热带气旋移速突变有超前相关;概括出的一些判据可供业务实践参考。
It is found that the surrounding fields with a saddle point, westerly trough or binary tropical storms are favourable to the sudden change in moving speed of tropical cyclones. Under the condition of the above surrounding fields, some leading correlation to such sudden changes have been revealed in the development of vorticity, vorticity advection, stream function and vertical wind shear between 850hPa and 200hPa, as well as in the evolution of asymmetric structure of storms Finally, some criteria which may be helpful to operational prediction have been suggested in this paper.
出处
《热带海洋》
CSCD
1992年第2期17-24,共8页
基金
国家气象局台风基金
关键词
热带气旋
移速突变
环境流场
南海
Abrupt change in movement speed, Shear of stream function, Ambient flow field, Vorticty advection, Tropical cyclone, South China Sea
