双流机场一次低能见度天气过程分析

Analysis of A Low Visibility Weather Process in Shuangliu Airport

利用机场常规观测资料(METAR报文)、ERA-Interim(1°×1°)再分析资料和温江气象站一日两次的探空资料,对2016年12月7~8日双流机场一次持续性低能见度天气过程进行了研究分析。结果表明:500hPa环流背景与此次低能见度天气过程的变化密切相关;逆温层高度及厚度的变化对整个演变过程起主导作用,同时逆温层的长期存在直接导致此次天气过程持续时间较长;晴朗的夜空、逆温层、地面冷却辐射、水汽饱和以及近地面的微风状况,共同作用致使生成辐射雾导致7日15时能见度急剧下降;整个过程地面风场处于微风条件且气压逐渐降低,两者对能见度的变化未起到决定性的作用。

Using airport conventional observation data(METAR messages),ERA-Interim(1°× 1°)reanalysis data and twice-a-day sounding data from Wenjiang Meteorological Station,a continuous low visibility weather process was carried out Research and analysis at Shuangliu Airport from December 7 to 8,2016.The results show th a t:①The 500hPa circulation background is closely related to the changes in the low-visibility weather process;②The changes in the height and thickness of the inversion layer play a leading role in the entire evolution process,and the long-term existence of the inversion layer directly leads to the duration of the weather process Longer;③The clear night sky,inversion layer,ground cooling radiation,water vapor saturation,and the breeze near the ground,combined to generate radiation fog,resulting in a sharp drop in visibility at 15:00 on the 7 th;④The surface wind field was under breeze conditions during the whole process.The air pressure gradually decreased,and the two did not play a decisive role in the change of visibility.