2006～2015年北京市不同地区O_3浓度变化  

Variation of O_3 Concentration in Different Regions of Beijing from 2006-2015

作　　者：王占山[1,2] 李云婷 安欣欣[1,2] 李倩 孙乃迪[1,2] 王步英 潘锦秀[1,2] 

机构地区：[1]北京市环境保护监测中心,北京100048 [2]大气颗粒物监测技术北京市重点实验室,北京100048

出　　处：《环境科学》2018年第1期1-8,共8页Environmental Science

基　　金：国家科技支撑计划项目(2014BAC23B03);北京市优秀人才培养资助项目(2016000021733G168);国家自然科学基金青年科学基金项目(41705112)

摘　　要：对2006~2015年北京市定陵、官园、琉璃河和前门这4个站点的O_3连续监测数据进行分析,探讨其浓度水平、变化趋势、时间变化规律以及和前体物、气象要素的关系.结果表明,定陵站十年平均浓度水平最高(65.2μg·m^(-3)),其次为琉璃河(53.4μg·m^(-3))、官园(49.6μg·m^(-3))和前门(40.4μg·m^(-3)).定陵O_3浓度呈下降趋势[0.5μg·(m^3·a)^(-1)],而官园[0.9μg·(m^3·a)^(-1)]、琉璃河[0.3μg·(m^3·a)^(-1)]和前门[0.3μg·(m^3·a)^(-1)]均呈上升趋势.从月变化来看,各站点O_3浓度最高值均出现在6~8月,出现频次最高的为7月(17次),平均月均浓度为99.8μg·m^(-3);最低值均出现在11、12月和1、2月,出现频次最高的为1月(14次),平均月均浓度为16.6μg·m^(-3).从日变化来看,近年来O_3浓度峰值出现的时间明显提前,近3年峰值均在15:00~16:00出现,提前了1~2 h.2015年定陵站O_3重污染天数达到11 d,比2013年增加了10 d,表明近年来夏季北京下风向山区的O_3重污染状况愈发严重.与前体物的相关性分析表明,定陵站O_3浓度与NO2浓度呈正相关,其余站点两者浓度均呈负相关,暗示定陵站O_3生成的前体物控制区可能为NO2控制区,而其他站点为VOCs控制区.与气象要素的相关性分析表明,O_3浓度与温度呈正相关关系,与湿度和气压呈负相关关系,温度对O_3浓度的影响最大,其次是气压和湿度.当日最高温度超过30℃,相对湿度介于30%至70%之间时,北京市O_3日最大8 h滑动平均浓度超过200μg·m^(-3)的概率较高,空气质量级别会达到轻度至中度污染的级别.O3 continuous monitoring data for the Dingling,Guanyuan,Liulihe,and Qianmen sites from 2006-2015 were analyzed to investigate concentration levels,variation trends,temporal variations,and relationships with precursors and meteorological factors.The results showed that the ten year average concentrations of O_3 at the Dingling site were the highest at 65.2 μg·m^（-3）,followed by concentrations at Liulihe（53.4 μg·m^（-3））,Guanyuan（49.6 μg·m^（-3）） and Qianmen（40.4 μg·m^（-3））.The O_3 concentrations at Dingling showed a decreasing trend [0.5 μg·（m^3·a）^-1],while O_3 concentrations at Guanyuan [0.9 μg·（m^3·a）^-1],Liulihe [0.3μg·（m^3·a）^-1],and Qianmen [0.3 μg·（m^3·a）^-1] showed an increasing trend.The highest monthly average concentrations appeared during June and August,and the highest frequency occurred in July（17 times） with average concentrations of 99.8 μg·m^（-3）.The lowest monthly average concentrations appeared during November and February,and the highest frequency occurred in January（14 times） with an average concentration of 16.6 μg·m^（-3）.Notably,the time for the peak concentrations of O_3 appeared earlier in the day in recent years.The peak concentrations of O_3 appeared at 15：00-16：00 during 2013-2015,which was 1-2 hours earlier than previous years.The heavy air pollution of O_3 occurred on 11 days at the Dingling site in 2015,which was ten days more than in 2013,indicating O_3 pollution in the downwind suburban regions of Beijing in summer became more and more serious.The concentrations of O_3 and NO2 at Dingling showed a positive correlation,while the concentrations of O_3 and NO2 at the other sites showed a negative correlation,indicating O_3 formation in Dingling was sensitive to NO2 chemistry,while O_3 formation at the other sites was sensitive to VOC chemistry.The concentrations of O_3 showed a positive correlation with temperature and negative correlations with humidity and surface pressure.Temperature had the great

关 键 词：北京 O3 长期 前体物 气象条件 控制区 

分 类 号：X515[环境科学与工程—环境工程]