2013年1-2月华北雾、霾天气边界层特征对比分析

Analysis on Boundary Layer Characteristics in Fog and Haze Processes in North China from January to February 2013

利用地面观测资料、中国气象局PM_(2.5)质量浓度数据、L波段探空秒数据等,对华北地区三个大城市(北京、石家庄和太原)的雾、霾及晴天天气的地面风场特征及PM_(2.5)浓度分布情况进行了统计分析。同时分析了典型雾、霾天气过程中的边界层气象要素垂直结构及逆温层特征,并与晴天过程做了对比。通过对不同强度雾、霾天气过程的边界层动力、热力学结构差异的讨论,发现逆温强度与雾、霾天气的能见度有负相关关系,并对雾、霾天气的发生有一定的预报指示意义。

Surface observation, CMA PM2.5 concentration, L-band sounding second data and other informa- tion are used to analyze surface wind characteristics and mass concentration of PM2.5 on fog,haze and clear days in Beijing, Shijiazhuang and Taiyuan from January to February 2013. Typical fog-haze processes are selected to analyze vertical structure of boundary layer and inversion layer characteristics, which are also compared with those of clear days. Dynamical and thermal differences in boundary layer are summarized according to different intensities in fog-haze processes. Analysis result shows that inversion intensity has a negative correlation with visibility, which has some indicating importance in fog and haze predictions.