在广西造成严重天气的中尺度系统概述

利用现有的常规资料和已有科学试验提供的有关资料,摸索那些在广西造成重大天气的中尺度系统的“踪迹”,企图从某些侧面揭示这些中尺度系统的“实体”,中尺度环流系统包括地形性中尺度环流和自由大气中尺度环流系统两大类。认为可以造成广西严重天气的中尺度系统中地形性的有2种,其一是区外地形原因形成的如锋面上的中尺度拢动、西南低涡、海南岛绕流辐合等,其二是广西境内地形原因形成的如热带气旋环流内的中尺度拢动、东（兰）巴（马）凤（山）气旋性涡旋、昭平辐合等;自由大气中的中尺度系统有低空西南急流上非地转风所激发出来的重力波、边界层内的惯性重力波、中尺度对流系统等。

SUMMARIZATION OF MESO-SCALE SYSTEM PRODUCING SEVERE WEARHER IN GUANGXI

The study of meso scale and micro scale meteorology is one of the foreland in the area of atmosphere science. Many kinds of disaster weather are related with the activity of meso scale system. For studying the meso scale circulation system. The authors attempt to explore the "track"of meso scale system, which produce severe weather in Guangxi, and reveals the essence of meso scale system in some respects, based on conventional data and those provided by scientific experimentation. The results show that there are two types of topographic meso scale system that bring severe weather, one is from outside Guangxi, such as meso scale disturbance on the frontal southwest depression and convergence caused by diffractive flow over Hainan island, the other is caused by local terrain, for example, meso scale disturbance in tropic cyclone circulation, vortex in Donglan, Bama, Fengshan counties, and convergence in Zhaoping. Free atmosphere meso scale system bringing severe weather include gravitational wave caused by ageostrophic wind in the southwest low level jet, inertial gravitational wave in the planetary boundary layer and meso scale convective system.