摘要
O_(3)污染危害人体健康、影响气候变化,已成为中国城市大气中的重要环境问题.近年来,河南省濮阳市石化产业规模发展扩大,大气O_(3)污染严重.本文利用统计分析的手段,基于2021年5—9月逐时污染物、气象数据,研究了濮阳市O_(3)污染特征及O_(3)生成的影响因素(前体物、细颗粒物、气象条件).结果表明,濮阳市O_(3)污染最严重的时间出现在6月,小时浓度最大值达到483μg·m^(-3),各站点浓度最大值基本上大于250μg·m^(-3).O_(3)浓度日变化单峰型特征明显,在13:00—16:00达到峰值.O_(3)与氮氧化物(NOx)呈显著负相关(相关系数为-0.45~-0.3),与挥发性有机物(VOCs)呈显著正相关(相关系数为0.23~0.31),其中,己烯、异戊二烯、乙醛的O_(3)生成潜势最大;O_(3)与细颗粒物(PM_(2.5))呈负相关,但不同站点相关显著性存在差异;O_(3)污染随着温度上升、相对湿度下降而加剧,与偏南风风速之间呈显著正相关.进一步选取两段重污染个例分析O_(3)与气象条件的关系,发现高温低湿的天气条件会明显加剧O_(3)污染.可见,濮阳市O_(3)污染情况严重,主要受VOCs控制,可能存在来自南方的污染物输送.
Ozone pollution has emerged as a significant environmental concern in the urban atmosphere of China,posing threats to human health and exerting impacts on climate change.In recent years,the petrochemical industry in Puyang City,Henan Province has experienced considerable expansion,resulting in a notable enhancement of ozone pollution.Using hourly pollutant concentration and meteorological data collected between May to September 2021 in Puyang,we employed statistical analysis to investigate the characteristics of ozone pollution and the factors influencing ozone formation,including precursors,fine particles and meteorological conditions.Investigations showed that the ozone peak in Puyang City occurred in June,with the maximum hourly concentration reaching 483μg·m^(-3).Moreover,the maximum concentration observed at most monitoring stations exceeded 250μg·m^(-3).The diurnal variation of ozone exhibited distinct single-peak with the highest value observed between 13:00 and 16:00.Ozone showed a negative correlation with nitrogen oxides(NO_(x))(r=-0.45~-0.3),and a positive correlation with volatile organic compounds(VOCs)(r=0.23~0.31).Among the VOCs,hexene,isoprene and acetaldehyde were identified as the primary contributors to ozone pollution.There was a negative correlation between O_(3)and PM_(2.5),although the correlation varies significantly among different monitoring sites.Ozone pollution was exacerbated by increasing temperature and decreasing relative humidity,while it exhibited a positive correlation with southerly wind speed.The relationship between ozone and meteorological conditions was further analyzed by investigating two heavy pollution cases.It was found that high temperature and dry weather conditions significantly exacerbated ozone pollution.In summary,Puyang experiences significant ozone pollution,particularly during high temperature and low humidity weather conditions.This pollution is primarily influenced by VOCs,and there is a possibility of pollutant transport from southern regions.
作者
李裕文
王体健
燕鸥
任倩宇
王红丽
乔利平
严茹莎
李源昊
王慎阳
LI Yuwen;WANG Tijian;YAN Ou;REN Qianyu;WANG Hongli;QIAO Liping;YAN Rusha;LI Yuanhao;WANG Shenyang(School of Atmospheric Sciences,Nanjing University,Nanjing 210023;School of the Environment,Nanjing University,Nanjing 210023;Shanghai Academy of Environmental Science,Shanghai 200233;Puyang Ecological Environment Monitoring Center,Puyang 457000)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第10期226-235,共10页
Acta Scientiae Circumstantiae
基金
濮阳市细颗粒物和臭氧协同防控综合解决方案研究项目(No.DQGG202135)。
关键词
O_(3)
濮阳
污染特征
相关分析
生成潜势
影响因素
ozone pollution
Puyang
pollution characteristics
correlation analysis
formation potential
influence factor
