中文关键词北京O₃长期前体物气象条件控制区 英文关键词BeijingO₃long-termprecursormeteorological conditionozone-precursor sensitivity regimes

作者	单位	E-mail
王占山	北京市环境保护监测中心,北京 100048 大气颗粒物监测技术北京市重点实验室,北京 100048	18701650609@163.com
李云婷	北京市环境保护监测中心,北京 100048 大气颗粒物监测技术北京市重点实验室,北京 100048	lee_yunting@163.com
安欣欣	北京市环境保护监测中心,北京 100048 大气颗粒物监测技术北京市重点实验室,北京 100048
李倩	北京市环境保护监测中心,北京 100048 大气颗粒物监测技术北京市重点实验室,北京 100048
孙乃迪	北京市环境保护监测中心,北京 100048 大气颗粒物监测技术北京市重点实验室,北京 100048
王步英	北京市环境保护监测中心,北京 100048 大气颗粒物监测技术北京市重点实验室,北京 100048
潘锦秀	北京市环境保护监测中心,北京 100048 大气颗粒物监测技术北京市重点实验室,北京 100048

中文摘要 对2006~2015年北京市定陵、官园、琉璃河和前门这4个站点的O₃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（65.2 μg·m^-3），其次为琉璃河（53.4 μg·m^-3）、官园（49.6 μg·m^-3）和前门（40.4 μg·m^-3）.定陵O₃浓度呈下降趋势［0.5 μg·（m³·a）^-1］，而官园［0.9 μg·（m³·a）^-1］、琉璃河［0.3 μg·（m³·a）^-1］和前门［0.3 μg·（m³·a）^-1］均呈上升趋势.从月变化来看，各站点O₃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99.8 μg·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16.6 μg·m^-3.从日变化来看，近年来O₃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O₃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O₃重污染状况愈发严重.与前体物的相关性分析表明，定陵站O₃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O₃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，O₃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O₃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O₃日最大8 h滑动平均浓度超过200 μg·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. 英文摘要 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 O₃ 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 O₃ concentrations at Dingling showed a decreasing trend[0.5 μg·(m³·a)^-1], while O₃ concentrations at Guanyuan[0.9 μg·(m³·a)^-1], Liulihe[0.3 μg·(m³·a)^-1], and Qianmen[0.3 μg·(m³·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 O₃ appeared earlier in the day in recent years. The peak concentrations of O₃ appeared at 15:00-16:00 during 2013-2015, which was 1-2 hours earlier than previous years. The heavy air pollution of O₃ occurred on 11 days at the Dingling site in 2015, which was ten days more than in 2013, indicating O₃ pollution in the downwind suburban regions of Beijing in summer became more and more serious. The concentrations of O₃ and NO₂ at Dingling showed a positive correlation, while the concentrations of O₃ and NO₂ at the other sites showed a negative correlation, indicating O₃ formation in Dingling was sensitive to NO₂ chemistry, while O₃ formation at the other sites was sensitive to VOC chemistry. The concentrations of O₃ showed a positive correlation with temperature and negative correlations with humidity and surface pressure. Temperature had the greatest influence on O₃ concentration, followed by surface pressure and humidity. For cases when daily maximum temperature exceeded 30℃ and relative humidity was between 30% and 70%, the probability of the O₃ daily maximum 8 h concentration exceeding 200 μg·m^-3 was high, indicating the air quality level reached levels for light pollution and moderate pollution.

PDF全文下载地址:

https://www.hjkx.ac.cn/hjkx/ch/reader/create_pdf.aspx?file_no=20180101&flag=1&journal_id=hjkx&year_id=2018