豫中地区一次雷雨过程特征分析

Analysis of the Characteristics of a Thunderstorm in the Central Henan Province

利用ERA再分析资料和郑州机场多普勒雷达及风廓线雷达资料等,对2019年8月6日导致郑州机场大面积航班延误的一次雷雨过程进行特征分析。结果表明,本次雷雨是一次低涡雷雨过程,受蒙古冷涡后部的干冷空气东移南下和中层伴有切变辐合共同影响。水汽来源主要通过西南暖湿气流和台风外围气流输入。高空冷槽叠加低层暖空气之上造成较强的层结不稳定性,地面辐合线和出流边界是本次过程的触发条件。本地的多普勒雷达和风廓线雷达产品可以较好地反应出短时强对流天气的降水和风切变的变化信息。

Using ERA reanalysis data,Doppler radar data and wind profile radar from Zhengzhou Airport,we analyzed a thunderstorm that occurred in Zhengzhou Airport which caused extensive flight delays on 6 August 2017.The results showed that this was a low-vortex thunderstorm process.It affected by the dry cold air in the rear of the Mongolian cold vortex moving eastward and southward and the middle layer with shear convergence.Southwest warm and humid air currents and water vapor around the typhoon became water vapor sources.Cold trough at high levels and warm air in lower levels lead to unstable stratification,the surface convergence line and outflow boundary triggered this process.The Doppler radar data and the wind profile radar data could well reflect the change information of precipitation and wind shear in short-term strong convective weather.