2017~2022年环渤海地区代表性城市臭氧时空分布特征及气象条件的影响  

Spatiotemporal Distribution Characteristics of Ground-level-ozone and Its Relationship with Meteorological Conditions in a Representative City in the Bohai Rim from 2017 to 2022

作　　者：安聪 纪元元 储王辉 颜晓宇 毕方[1] 高锐 薛丽坤 尚凡一 李吉东 李红[1] AN Cong;JI Yuan-yuan;CHU Wang-hui;YAN Xiao-yu;BI Fang;GAO Rui;XUE Li-kun;SHANG Fan-yi;LI Ji-dong;LI Hong(State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China;College of Earth Sciences,Jilin University,Changchun 130061,China;Environment Research Institute,Shandong University,Qingdao 266237,China;Dongying Ecological and Environmental Bureau,Dongying 257091,China)

机构地区：[1]中国环境科学研究院环境基准与风险评估国家重点实验室,北京100012 [2]吉林大学地球科学学院,长春130061 [3]山东大学环境研究院,青岛266237 [4]东营市生态环境局,东营257091

出　　处：《环境科学》2024年第8期4398-4410,共13页Environmental Science

基　　金：大气重污染成因与治理攻关项目(DQGG202121);东营市生态环境局细颗粒物和臭氧污染协同防控“一市一策”驻点跟踪研究项目(2021-地方科研-0779)。

摘　　要：近年来环渤海地区城市环境空气臭氧(O_(3))污染问题引起广泛关注.在对2017~2022年环渤海地区代表性城市东营市O_(3)浓度时空分布特征进行分析的基础上,评估了气象因素及海陆风环流对O_(3)浓度的影响.结果表明:(1)2017~2022年,东营市O_(3)年评价值呈波动上升趋势,以O_(3)为首要污染物的污染天数增加.O_(3)污染主要出现在春夏秋三季,其中5~6月最为严重,且O_(3)污染季持续时间变长.O_(3)浓度日最大8 h滑动平均值(MDA8 O_(3))的月际变化呈双峰分布,第5和25百分位数增加明显,空间分布呈现“南北高,中部低”的特征.此外,近年来东营市夜间O_(3)浓度也表现出明显增加的趋势.(2)气象因素对东营市O_(3)浓度变化有较大影响.在温度>30℃、相对湿度<50%、风向为西南偏南或东北偏东时易出现O_(3)高值.研究期间东营市气象因素贡献了MDA8 O_(3)变化的30%;在O_(3)中度污染与重度污染的情况下,气象因素对MDA8 O_(3)变化的贡献率可高达40%.(3)海陆风对O_(3)超标日的发生具有一定贡献.海陆风日午后O_(3)浓度比非海陆风日高20μg·m^(-3)左右.在O_(3)中度及重度污染日,海陆风日10:00~16:00的O_(3)浓度比非海陆风日O_(3)浓度高,且20:00~23:00 O_(3)浓度也处于较高水平.可见海陆风能够显著影响沿海地区城市O_(3)浓度,为该地区的O_(3)污染防控带来极大的挑战.建议未来环渤海地区城市进一步加强区域O_(3)污染联防联控联治,加大氮氧化物和挥发性有机物的减排力度,以减少陆风气团中污染物浓度,从而降低海风气团对环渤海地区城市空气质量的影响.In recent years,ground-level-ozone(O_(3))pollution in urban areas in the Bohai Rim has attracted wide attention.Based on the analysis of the spatiotemporal distribution characteristics of O_(3)concentration in Dongying,a representative city in the Bohai Rim from 2017 to 2022,the effects of meteorological factors and sea-land breeze circulation on O_(3)concentration were evaluated.The results showed that:①From 2017 to 2022,the annual assessment value of O_(3)concentration in Dongying showed a fluctuating upward trend,and the pollution days with O_(3)as the primary pollutant increased.O_(3)pollution mainly occurred in spring,summer,and autumn,with the most severe O_(3)pollution episodes typically occurring in May and June,and the duration of O_(3)pollution season tended to be longer.The monthly variation in the daily maximum 8-h average ozone(MDA8 O_(3))presented a bimodal distribution,with significant increases in the 5th and 25th percentiles,and the spatial distribution was“high in the north and south,low in the middle.”In addition,the nocturnal O_(3)concentration in recent years in Dongying also showed a significant increase trend.②Meteorological factors greatly influenced O_(3)concentration in Dongying.When the temperature was greater than 30℃,the relative humidity was less than 50%,and the wind direction was south-southwest or east-northeast,a high O_(3)value was more likely to occur.Meteorological factors contributed 30%of the MDA8 O_(3)variation in Dongying during the study period.In the case of moderate and severe O_(3)pollution,the contribution of meteorological factors to the change in MDA8 O_(3)could be as high as 40%.③To some extent,sea-land breeze contributed to the occurrence of MDA8 O_(3)exceeding the secondary standard limit value of the National Ambient Air Quality Standard.In the afternoon,the hourly concentration of O_(3)during the sea-land breeze days was approximately 20µg·m^(-3)higher than that during the non-sea-land breeze days.On the days of moderate and severe O_(3)pollution,

关 键 词：臭氧(O_(3)) 时空分布特征 气象条件 海陆风 环渤海地区 

分 类 号：X515[环境科学与工程—环境工程]