风廓线雷达资料在聊城霾天气过程分析中的应用

Application of Wind Profile Radar Data in the Analysis of Haze Weather in Liaocheng

【目的】通过分析CLC-11-D型边界层风廓线雷达资料,以期提高环境气象预报水平。【方法】统计2015—2020年霾天气过程中的大气边界层高度和风场特征。【结果】霾日数年平均为62d,呈逐年减少趋势;霾在冬季发生最多,其次是春季,冬春季霾日数占全年霾日数的82.1%;地面~1000 m大气层霾出现的概率随风速增大而减小,风速≤6 m·s^(-1)最有利于霾的形成、维持和发展,6m·s^(-1)<风速≤8 m·s^(-1)时霾减弱,风速>8 m·s^(-1)有利于霾的消散;1000~1500 m大气层风速≤8 m·s^(-1)最有利于霾的形成、维持和发展;1500~2100 m大气层2.1m·s^(-1)<风速≤6m·s^(-1)最有利于霾的形成、维持和发展;2100~3000 m大气层4.1 m·s^(-1)<风速≤8 m·s^(-1)最有利于霾的形成、维持和发展;地面~1500 m大气层霾出现时风向没有明显的规律,1500 m以上大气层西北风、西风最有利于霾的生成;925 hPa和850 hPa天气系统演变对霾天气的生成、发展、维持和消散具有指示意义。【结论】风廓线雷达在分析聊城霾天气过程中有重要应用,其资料特征可为环境天气预报预警和研究提供参考依据。

[Purposess]The research aimed to improve the level of environmental meteorological forecast by analyzing the CLC-11-D boundary layer wind profile radar data.[Methods]The atmospheric boundary layer height and wind field characteristics during haze weather from 2015 to 2020 were analyzed.[Findings]The results showed that:Annual average number of hazes is 62,it is decreasing year by year;haze occurs most frequently in winter,spring secondary to it,and the day number of haze in winter and spring account for 82.1%of the total number in the whole year;the probability of hazes occurrence decreases as the wind speed increased in the atmosphere from the ground to 1000 m,wind speed which less than orequal 6 m·s^(-1) is most conducive to the formation,maintenance and development;haze abates when the wind speed is greater than 6 m·s^(-1) and less than or equal to 8 m·s^(-1),and the haze dissipates when wind speed is greater than 8 m·s^(-1);the atmospheric wind speed which less than or equal to 8 m·s^(-1) from 1000 m to 1500 m is most conducive to the formation,maintenance and development;the atmospheric wind speed which greater than 2.1 m·s^(-1) and less than or equal to 6 m·s^(-1) from 1500 m to 2100 m is most conducive to the formation,maintenance and development;the atmospheric wind speed which greater than 4.1 m·s^(-1) and less than or equal to 8 m·s^(-1) from 2100 m to 3000 m is most conducive to the formation,maintenance and development;there is no obvious law of wind direction when haze appears in the atmosphere from the surface to 1500 m,the northwest wind and westerly wind above 1500 m are most favorable for haze formation;the evolution of 925 hPa and 850 hPa weather system is of significance to the generation,development,maintenance and dissipation of haze weather.[Conclusions]Wind profile radar has an important application in the analysis of Liaocheng haze weather process,and its data characteristics provide a reference basis for environmental weather forecast,early warning and research.