摘要
从湿大气的绝热、无粘、包辛内斯克近似的二维线性化方程组出发 ,考虑基本气流热成风不平衡 ,在经典的对称不稳定理论基础上推导出修正了的对称不稳定判据 ,发现基流热成风不平衡在一定条件下有利于对称不稳定发展。同时根据推导出的判据 ,利用高分辨率的模式输出资料 ,对一次飓风过程作了对称不稳定的动力诊断 ,发现对称不稳定是飓风眼壁中深厚倾斜上升运动产生的可能机制。
In this paper, a modified symmetry instability criterion for thermal wind non equilibrium basic flow is deduced by using two dimensional liner equations with Boussinesq approximation of moist air. It is found that the thermal wind non equilibrium of the basic flow is favourable for the development of symmetry instability under certain conditions. Then, the symmetry instability of a hurricane with this criterion is diagnosed, and the results show that the symmetry instability may serve as the mechanism for the development of the slantwise updraft in the eyewall.
出处
《解放军理工大学学报（自然科学版）》
EI
2000年第6期86-91,共6页
Journal of PLA University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(49875009)。
关键词
非热成风平衡
对称不稳定
倾斜上升运动
thermal wind non equilibrium
symmetry instability
slantwise ascending motion
