银川河东机场2次低空风切变天气过程的对比分析

Comparative Analysis of Two Low-altitude Windshear Weather Processes in Yinchuan Hedong Airport

银川河东机场目前可用于低空风切变探测的设备有风廓线雷达、多普勒天气雷达、国产测风激光雷达及自观测风系统。该文选取了2次低空风切变天气过程,通过分析形势场及物理量场资料,并利用各探测设备资料进行分析对比。激光雷达的下滑道和PPI对于局部水平风场不均匀,风向变化导致的风切变天气,可进行有效告警。多普勒雷达低仰角速度图上的零速度线对风切变的发生有一定指示作用。风廓线雷达资料中风切变发生时刻前后对应着垂直风的上升运动,以及水平风的风向、风速的明显切变。

At present,the low-altitude windshear detection equipment available in Yinchuan Hedong Airport are wind profile radar,Doppler weather radar,domestic wind LiDAR and self-observation wind system.In this paper,two low-level windshear weather processes are selected,and the data of potential field and physical quantity field are analyzed and compared using the data of various detection equipment.The glide path and PPI of LiDAR can effectively warn the windshear weather caused by the uneven local horizontal wind field and the change of wind direction.The zero velocity line on the low elevation velocity map of Doppler radar can indicate the occurrence of windshear to a certain extent.Wind profile radar data before and after the occurrence of stroke shear corresponds to the rising movement of vertical wind,as well as the obvious shear of wind direction and wind speed of horizontal wind.