Abstract: Wind shear incidences are always related to local downburst, gust front or other systems. An analysis of a low-level wind shear case at Guangzhou Baiyun airport on Jul 21, 2005 shows that this case was caused by downburst and gust front. The real-time wind data from local terminal Doppler radar and auto weather observation stations were calculated to obtain the degree of wind shear and turbulence. Flight data belong to one aircraft has verified the method to alert wind shear is feasible under the limited resources of Guangzhou Baiyun airport.

Key words: downbust, gust front, low-level wind shear, aircraft turbulence

摘要： 对2005年7月21日发生在广州白云机场的一次低空风切变飞行事件进行分析，发现此次过程是由超级单体风暴云产生的下击暴流和阵风锋造成的。利用机场实时的多普勒气象雷达和地面自动观测资料定量计算出风切变的大小，从而确定风切变和飞机颠簸的强度等级。并通过与飞行数据作检验分析，证实在广州白云机场现有的条件下，设计出的风切变预警方法是基本可行的。

关键词: 阵风锋, 低空风切变, 飞机颠簸, 下击暴流