珠三角城市近地面臭氧污染分布特征及变化趋势
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摘要
利用2013—2017年珠三角城市空气质量监测站的大气常规污染物逐时监测数据,探究珠三角区域臭氧(O3)污染年际变化、季节变化、日变化特征。结果表明,珠三角O3浓度秋季高冬春低,在一年之内呈现2月、5月、9—11月从低到高3个峰值;在一天之内呈现昼高夜低的单峰结构,峰值大多出现在午后15:00时。珠三角中部城市超标天数较多,沿海城市超标天数较少,大部分城市每年O3超标天数逐渐增多。O3月变化和日变化与NO2呈现负相关。总体而言,NO2平均浓度越高的城市,O3昼夜爬升值越高。
The continuous observation O_3 concentration in monitoring stations of the Pearl River Delta from2013 to 2017 were used to study the annual,seasonal and diurnal distribution.The results showed that O_3 concentration of the Pearl River Delta is high in autumn and low in winter and spring,with three peaks in February,May and September to November from low to high,which made autumn the heaviest polluted season.Diurnal variations of O_3 concentration indicated high concentration during the day and low concentration at night,showing a single peak at 15:00.There were more O_3 polluted days in central cities of Pearl River Delta,while less polluted days in the coastal cities.The number of annual polluted days increased in most cities.Monthly and diurnal O_3 changes were inversely related to NO2.In general,cities with higher NO2 concentration had a larger daily variation range of O_3.
The continuous observation O_3 concentration in monitoring stations of the Pearl River Delta from2013 to 2017 were used to study the annual,seasonal and diurnal distribution.The results showed that O_3 concentration of the Pearl River Delta is high in autumn and low in winter and spring,with three peaks in February,May and September to November from low to high,which made autumn the heaviest polluted season.Diurnal variations of O_3 concentration indicated high concentration during the day and low concentration at night,showing a single peak at 15:00.There were more O_3 polluted days in central cities of Pearl River Delta,while less polluted days in the coastal cities.The number of annual polluted days increased in most cities.Monthly and diurnal O_3 changes were inversely related to NO2.In general,cities with higher NO2 concentration had a larger daily variation range of O_3.
引文
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[5]刘建,吴兑,范绍佳,等.前体物与气象因子对珠江三角洲臭氧污染的影响[J].中国环境科学,2017,37(3):813-820.
[6]安俊琳,王跃思,孙扬.气象因素对北京臭氧的影响[J].生态环境学报,2009,18(3):944-951.
[7]潘月云,陈多宏,叶斯琪,等.2015年9月珠江三角洲一次区域大气污染过程特征分析[J].环境科学与技术,2017,40(1):188-192.
[8] CHAN C K,YAO X H.Air pollution in mega cities in China[J].Atmospheric Environment,2008,42(1):1-42.
[9]嵇萍,汪宇,陈多宏,等.台风登陆前珠三角地区近地面O3浓度升高的原因初探[J].环境污染与防治,2018,40(3):296-300.
[10]王宇骏,黄新雨,裴成磊,等.广州市近地面臭氧时空变化及其生成对前体物的敏感性初步分析[J].安全与环境工程,2016,23(3):83-88.
[11]李泽琨.珠江三角洲地区臭氧及其前体物非线性响应特征及控制对策研究[D].广州:华南理工大学,2015.
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