2023年2月5日南宁吴圩国际机场初雷天气过程分析  

作　　者：曾翔宇 刘箩石 梁宸 肖称根 

机构地区：[1]民航广西空中交通管理分局,南宁530048

出　　处：《科技创新与应用》2024年第1期93-97,共5页Technology Innovation and Application

摘　　要：该文利用EC再分析资料ERA5(0.25°×0.25°)、自动气象观测站资料、多普勒天气雷达资料、探空资料、风廓线雷达资料,对2023年2月5日南宁吴圩国际机场发生的初雷天气过程进行分析。结果表明,此次初雷天气过程具有出现时间偏早、持续时间偏短的特点,且雷雨发生前的天气形势及天气实况更符合冬春季连阴雨天气的情况,容易忽略雷暴的产生。此次初雷天气过程发生时近地面受冷空气控制,雷暴在近地层的逆温层以上发展,属于典型的高架雷暴。中低层持续的暖平流造成垂直温度递减率加大,不稳定层结加强,同时中低层水汽充足且存在辐合,是此次高架雷暴产生的主要条件。中低层的强西南暖湿气流叠加在近地层锋区上,沿锋区做斜升运动,低空急流加强产生的辐合以及925 hPa高度的切变辐合为此次初雷的发生提供了初始抬升条件,可能是此次对流形成的触发机制。风廓线雷达最大探测高度、低空急流指数的突然增大,对流参数中的K指数、SI指数、θ_(se850)-θ_(se500)、T_(850)-T_(500)以及订正后的CAPE值,均对此次雷暴天气的预报有较好的指示作用。In this paper,EC reanalysis data ERA5(0.25°×0.25°),automated weather observing station data,Doppler weather radar data,radiosonde data and wind profile radar data are used to analyze the weather process of the initial thunderstorm that occurred at Nanning Wuwei International Airport on February 5,2023.The results show,the initial thunder weather process has the characteristics of early occurrence time and short duration,and the weather situation and weather reality before the thunderstorm are more consistent with the situation of continuous rainy weather in winter and spring,so it is easy to ignore the occurrence of thunderstorms.When the initial thunder weather process occurred,the near ground was controlled by cold air,and the thunderstorm developed above the near-ground inversion layer,which was a typical elevated thunderstorm.The continuous warm advection in the middle and low levels caused the increase of vertical temperature lapse rate,the strengthening of unstable stratification,and the sufficient water vapor and convergence in the middle and low levels were the main conditions for the generation of this elevated thunderstorm.The strong southwest warm and humid air in the middle and low layers superimposed on the near formation front and moved oblique upward along the front.The convergence caused by the strengthening of the low-level jet and the shear convergence at the height of 925 hPa provided the initial lifting conditions for the occurrence of the initial thunder,which may be the triggering mechanism for the formation of the convection.The maximum detection height of wind profiler radar,the sudden increase of low level jet stream index,the K index,SI index,θ_(se850)-θ_(se500),T_(850)-T_(500) and the revised CAPE value of convective parameters all have good indications for the forecast of this thunderstorm weather.

关 键 词：初雷 高架雷暴 暖平流 低空急流 对流参数 

分 类 号：V321.2[航空宇航科学与技术—人机与环境工程]