北京地区两次重污染过程中PM2.5浓度爆发性增长及维持的气象条件 吴进;李琛;孙兆彬;王华;马小会 【期刊名称】《干旱气象》 【年(卷),期】2017(035)005 【摘 要】基于京津冀地区80个环境监测站PM2.5浓度逐时监测资料和气象观测资料,以2016年12月16-21日和2017年1月1-7日雾和霾天气为例,分析PM2.5浓度演变的气象条件.结果表明:气象条件在北京地区污染物浓度爆发性增长过程中具有重要作用.北京地区12月19-20日PM2.5浓度出现爆发性增长,小时浓度在8h内上升201 μg·m-3,主要是边界层南风分量由地面增厚至700 m,700 m以上弱下沉抑制作用,结合地面辐合线维持所致;20-21日北京地区PM2.5浓度维持高值且无日变化,是由于低空1.5 km出现弱回暖,逆温层显著增厚增强且无明显日变化,导致高浓度气溶胶无法有效扩散.综合来看,2016年12月16-21日污染物浓度爆发性增长的原因以外源性污染物输送为主;2017年1月3-4日污染物浓度爆发性增长原因与局地极端不利扩散条件及污染排放等其他因素有关.%Based on hourly PM2.5 concentration data observed at 80 environmental monitoring stations and meteorological observation data in the Beijing-Tianjin-Hebei region,meteorological conditions were analyzed for the fog and haze events during 16-21 December 2016 and 1-7 January 2017.The results show that the meteorological conditions were more favourable for accumulation and transport of pollutants.The PM2.5 concentration increased sharply in Beijing from 19 to 20 December 2016,which was mainly due to the strengthening of southerly wind in the boundary layer from the surface to 700 meters height,the low level weak sink inhibition and maintenance of the ground convergence.During 20-21 December 2016,weak warming occurred in the atmospheric boundary layer below 1.5 km,and the inversion layer thickened and enhanced and there was no obviously diurnal variation,which led to weak diurnal variation of the mixed layer thickness and aerosol concentration and thus high value and weak diurnal variation of PM2.5 concentration.On the whole,during 16-21 December 2016,the explosive growth of pollutant concentration was dominated by exogenous pollutants transport.And during 3-4 January 2017,the explosive growth of the pollutant concentration was due to the local extreme adverse weather conditions,which was not conducive to the diffusion of pollutants. 【总页数】9页(P830-838) 【作 者】吴进;李琛;孙兆彬;王华;马小会 【作者单位】京津冀环境气象预报预警中心,北京100089;中国气象局北京城市气象研究所,北京100089;北京市气象服务中心,北京100089;中国气象局北京城市气象研究所,北京100089;京津冀环境气象预报预警中心,北京100089;京津冀环境气象预报预警中心,北京100089 【正文语种】中 文 【中图分类】X16 【相关文献】 1.北京两次沙尘污染过程中PM2.5浓度变化特征 [J], 徐文帅;张大伟;李云婷;陈添;吴其重 2.北京地区供暖季两次重污染过程气象条件对比 [J], 吴进;马志强;熊亚军;乔林;李琛;; 3.北京地区供暖季两次重污染过程气象条件对比 [J], 吴进;马志强;熊亚军;乔林;李琛 4.威海PM2.5和PM10造成重污染个例的气象条件对比分析 [J], 丛美环;周淑玲;周丹 5.北京地区气象条件与区域传输对PM2.5浓度影响研究 [J], 刘瑞琪;贾海鹰 因版权原因，仅展示原文概要，查看原文内容请购买 本文来源：https://www.wddqw.com/doc/6986206a4835eefdc8d376eeaeaad1f3469311f7.html