1992年AndreW飓风的中尺度特征

根据PSU-NCAR中尺度模式(MM5)对1992年Andrew飓风数值试验的高分辨率输出资料,分析了Andrew飓风的中尺度特征,研究飓风中的眼区、眼壁区及螺旋性雨带区不同的热力学和动力学结构.轴对称的物理量分布展现了眼壁区区别于眼区和螺旋性雨带区的动力学特征,非对称的物理量分布则表明眼壁区的强风暴天气发生在飓风的西北侧区域,揭示了飓风眼壁区的强倾斜上升气流与外围的螺旋性雨带具有不同发展机制的天气学概念模型.

Mesoscale Characters of the 1992 Hurricane Andrew

Based on the high resolution output of the numerical simulation of the 1992 Hurricane Andrew with a mesoscale model MM5 of PSU-NCAR, the paper represents the mesoscale characters of the Hurricane Andrew and the differences in thermodynamic and dynamic structures among the eye, eyewall and spiral rainbands. The axisymmetrical distribution of physical variables discloses the dynam- ic characters of the eyewall different from the eye and spiral rainbands, while the asymmetrical distribu- tion reveals that the weather of strong storm takes place in the northwest of the hurricane. At the same time, the asymmetrical distribution also shows a synoptic conceptual model, where there is different de- veloping mechanism between the strong slant ascending flow in the eyewall and the spiral rainbands.