北京地区夏末秋初不同天气形势对NOxO和PM和PM浓度的影响修改稿.docVIP

北京地区夏末秋初不同天气形势对NOx、O3和PM2.5/10浓度的影响 王莉莉1,王跃思1*,王迎红1,辛金元1,吉东生1,李亮1,任玉芬2（1.中国科学院大气物理研究所,北京 100029；2.中国科学院生态环境研究中心,北京 100085） 污染物浓度由排放源和天气过程共同决定,天气形势的变化决定区域大气环境的周期性、区域性和一致性.本文根据地面、850hpa和500hpa天气图,结合主要气象要素将夏末秋初(8月和9月)影响北京地区的主要天气系统分为2类,即高污染的积累天气型(包括4种基本型——槽前无降水、槽后脊前、脊、副高)和清洁的清除天气型(包括2种基本型——槽或槽前有降水、槽后有降水或偏北风).北京地区4站2007年在积累天气型控制时NOx、O3(日小时均值最大值)、PM2.5和PM10分别为38.1×10-9(体积分数)、115.2×10-9(体积分数)、90.6μg/m3、212.5μg/m3,清除天气型控制时4种污染物分别为36.3×10-9(体积分数)、68.9×10-9(体积分数)、39.3μg/m3、125.4μg/m3;2008年施行了北京奥运空气质量保障措施,上述4种污染物在积累天气型控制时分别为19.3×10-9(体积分数)、87.1×10-9(体积分数)、66.3μg/m3、99.6μg/m3,清除天气型控制时分别为19.0×10-9(体积分数)、62.5×10-9(体积分数)、41.0μg/m3、65.2μg/m3;尽管施行了源减排措施,积累天气型控制时北京地区污染物浓度仍相对较高,因此关注此天气形势下污染物的变化对预测重污染天气以及制订更为有效的减排措施意义重大.天气形势；NOx；O3；PM2.5/10；北京中图分类号X703.5 文献标识码A 文章编号 Relationship between different synoptic weather patterns and concentrations of NOx、O3 and PM2.5/10 in Beijing during Summer and Autumn1,WANG Yue-si1*,WANG Ying-hong1,XIN Jinyuan1,Li Liang1,JI Dongsheng1,YU Wen-peng1,REN Yufen2 (1. LAPC, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China; 2. Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China) Abstract：Pollution concentrations are controlled by source emission and weather situations, and the evolvement of synoptic systems influences the regional characteristic、periodic evolvements and consistency of atmospheric environment. Based on analyzing surface and 850500hpa level synoptic maps and primary meteorological factors in Beijing during summer and autumn, two group synoptic weather patterns were divided, that was accumulation synoptic pattern with higher pollutions including four basic types and dispersion synoptic pattern with lower pollution including two basic types. In 2007, concentrations of NOx、O3(hourly maximum)、PM2.5 and PM10 averaged from four sites in Beijng were 38.1×10-9(V/V)、115.2×10-9(V/V)、90.6μg/m3、212.5μg/m3 under accumulation synoptic pattern, respectively, while 36.