一次飓风过程的梯度风不平衡的中尺度动力诊断分析

飓风是中－α尺度系统，强风暴天气在飓风的分布不均匀，主要出现在眼墙区，眼墙区的气流结构及发生机理是飓风研究的重要问题，在张大林等用中尺度数值模式（MM5）对登陆美国的飓风Andrew(1992)过程的精确数值模拟基础上，使用高分辨率模式输出资料进行了中尺度运动学分析，进而动力诊断了飓风眼区，眼墙及螺旋雨带区的梯度风不平衡，指出眼墙内深厚径向外流的发展是由深厚超梯度加速度造成的，因此飓风的梯度风不平衡对飓风发展和维持起着重要作用。

Mesoscale Dynamical Diagnosis of Hurr icane Andrew

Hur ricane is one kind of meso-Ascale system. The severe w eather dist ributes unevenly in it , mainly ex ist ing in eyew all. The flow st ructure and its format ion mechanism ar e impartant subject s of hurricane research. This paper present s a mesoscale kinematic analysis o f one hurr icane case, w hich is based on the high reso lut ion output of an explicit simulat io n of Hurricane Andr ew landing on the U SA in 1992 w ith the mesoscale regional numerical model MM5. T he paper further do cument s the dynamical diagnosis of the g radient unbalance in the reg ion of the ey e, ey ew all and the spiral rainbands o f the hurricane. Based on the abo ve analy sis, the author po int s out that the dev elo pment of the deep radial out flow is due to the deep superg radient layer in the eyew all, therefore, the gradient unbalance play s an important r ole in the evolut io n of the hurricane.