1992年Andrew飓风眼壁区倾斜上升运动发展的可能机制——非线性对流对称不稳定

在1992年Andrew飓风数值试验输出高分辨资料的中尺度扰动结构分析基础上,对眼壁区倾斜上升运动进行了动力分析,指出存在一种非线性对流-对称不稳定的发展机理.梯度风不平衡是涡旋大气中提供对称不稳定的物理基础,并用模式资料诊断研究了倾斜上升气流存在的这种发展机理的可能.

A Possible Developing Mechanism of the Slantwise Updraft in the Eyewall of the 1992 Hurricane Andrew -Nonlinear Convective and Symmetrical Instability

Based on the analyses of the mesoscale disturbing structure of the 1992 Hurricane Andrew with the high resolution output of numerical model, the authors make dynamic analyses of the slantwise updraft in the eyewall, and point out that there is one kind of developing mechanism-nonlinear convective and symmetrical instability. Last, the paper documents that the gradient unbalance is the physical ground of CSI in vortex atmosphere, and diagnoses the possibility of this kind of developing mechanism in the slantwise updraft.