【摘要】 基于地面气象观测数据和环境空气质量监测数据,对2015年12月6～13日石家庄市一次持续性重度霾污染过程进行分析,结果表明:空气湿度大、地面风速小、天气静稳为此次持续性霾的发生和维持提供了有利的气象条件;污染过程中逆温主要为不贴地逆温,逆温的形成滞后于污染的形成,霾严重时段逆温顶发展至高空1 km以上,逆温层厚大于1 km;污染的大部分时段,能见度在1 km以下波动,当PM_2.5质量浓度达到一定水平后,相对湿度对能见度的影响高于PM_2.5质量浓度;不同情景计算表明,重污染过程中降低相对湿度和控制PM_2.5质量浓度均能改善大气能见度,但相对湿度是影响能见度的关键.更多还原

【Abstract】 A long-term severe haze pollution process in Shijiazhuang was analyzed using meteorological observational data and air quality monitoring data during December 6～13,2015.Results showed that Shijiazhuang was dominated by low surface wind speed,high air humidity and static stable weather which provided favorable meteorological conditions for the long-lasting haze.The formation of inversion layer lagged behind the formation of haze pollution,and during the period of severe haze,the top height of inversion layer was greater than 1 km,and the thickness of inversion layer was greater than 1 km.During most of the pollution period,the visibility fluctuated below 1 km and when the concentration of PM_2.5 reached a certain level, the visibility was dominated by relative humidity.Calculations in different scenarios showed that reducing relative humidity and controlling the concentration of PM_2.5 during heavy pollution improved visibility,but relative humidity was the key to visibility.更多还原