摘要
选取长江中下游地区一次梅雨期低涡暴雨过程，对实测资料作带通滤波后，分别应用天气尺度和次天气尺度涡度方程，计算方程各项在对流层各层次的量值，表明天气尺度涡旋场的演变，绝对涡度通量散度项是主要动力过程，而次天气尺度涡旋场的演变则决定于对流层低层两类尺度涡旋系统非线性相互作用．
y using a horizontal filtering scheme after a self-adaptive technique, meteorological variables are separated into synoptic and subsynoptic scale components. The vorticity equations for both scales are developed in this paper. Figure 1-2 displays the values of equation terms in the vertical cross sections (115°E) throush the rainfall area from south to north. The results show that the flux di-vergence of absolute vorticity is the main dynamic processes for the evolution of synoptic scale vortex and the interaction term plays an important role in the development of a subsynoptic scale system in lower tropocphere.
关键词
梅雨期
暴雨
天气尺度
涡旋系统
scale interaction
vortex energy budgets
Met-Yu rainstorm
