龙卷过程中雷达合成切变产品的分析

Analysis of Radar Composite Shear Products in the Process of Tornado

低空风切变是飞机起飞和着陆时最重要的危险因素,龙卷是低空风切变的一种,是由雷暴云底伸展至地面的漏斗状云产生的强风涡旋,龙卷位置和强度的识别对于飞行安全的保障有重要意义。使用最小二乘法根据多普勒天气雷达径向速度信息计算合成切变,进而对龙卷过程中的合成切变产品进行分析,得出以下结论:合成切变产品有助于识别龙卷所在位置,并能定量给出龙卷所在位置的风切变值。

Wind shear is the most important risk factors for take-off and landing,the tornado is a low-level wind shear,it is a vortex of strong winds produced by funnel clouds extending from the bottom of the storm cloud to the ground,Identify the position and intensity of the tornado has important significance to protect the safety of the flight. In this paper,using the least square method to calculate shear combination according to the Doppler weather radar radial velocity information,Further analysis of combined shear features in the process of the tornado,draw the following conclusions： combined shear products help to identify the location of the tornado,and tornados＇ wind shear are given quantitatively.