2009年江苏一次强对流天气过程的遥感监测

Observation of a strong convective system in Jiangsu Province in 2009 by remote sensing monitor

以卫星水汽图为主,结合可见光云图、雷达资料和常规天气观测资料,分析2009年6月5日发生在江苏徐州沛县的一次冰雹、龙卷天气,结果表明:卫星水汽图中动力异常区与对流系统的交界处和可见光云图上两个对流云团出流边界处触发的新的雷暴云团区域容易产生龙卷等强对流天气;水汽图上的水汽输送带与可见光云图的对流云系相一致,并且水汽图像特征与导致垂直运动和气流变形场的大尺度天气过程有关系,代表着对流层中上部的动力特征;强对流天气发生在低亮温对流云团中。高时空分辨率的卫星和雷达遥感资料很好地反映了短时强对流天气系统的发展与演变,有效地补充了常规天气资料分析的不足,为短时天气预报提供一种思路。

Based on the satellite water vapor image combining with visible picture and radar data and conventional observation, the paper analyzed the strong convective system in Peixian of Jiangsu Province on 5 June 2009. The results show that the junctions of satellite water vapor imagery abnormal dynamic areas and convection systems as well as the two convection cloud clusters effluent boundary in the visible image produced the strong convection weather such as tornado easily. The water vapor conveyors in the water vapor imagery were consistent with convection cloud systems in the visible image. Water vapor imagery feature is connected with the large scale weather process which resulted in vertical motion and air current deformation field. The water vapor imagery stands for dynamic feature of hightroposphere. Strong convection often occurs in the low brightness temperature cloud clusters. High spacetime resolution satellite and radar image can reflect the strong convective system very well and offset the insufficiency of conventional observation to provide a reference for the short-time weather forecasting.