| 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 |
| 摘要点击 2351 全文点击 581 投稿时间：2023-08-25 修订日期：2023-10-29 |
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| 中文关键词 臭氧（O3） 时空分布特征 气象条件 海陆风 环渤海地区 |
| 英文关键词 ozone（O3） spatiotemporal distribution characteristics meteorological condition sea-land breeze Bohai Rim |
| 作者 | 单位 | E-mail | | 安聪 | 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 | ancong_22@163.com | | 纪元元 | 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 | | | 储王辉 | 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 | | | 颜晓宇 | 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
吉林大学地球科学学院, 长春 130061 | | | 毕方 | 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 | | | 高锐 | 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 | | | 薛丽坤 | 山东大学环境研究院, 青岛 266237 | | | 尚凡一 | 东营市生态环境局, 东营 257091 | | | 李吉东 | 东营市生态环境局, 东营 257091 | | | 李红 | 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 | lihong@craes.org.cn |
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| 中文摘要 |
| 近年来环渤海地区城市环境空气臭氧（O3）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O3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O3浓度的影响.结果表明：①2017~2022年,东营市O3年评价值呈波动上升趋势,以O3为首要污染物的污染天数增加. O3污染主要出现在春夏秋三季,其中5~6月最为严重,且O3污染季持续时间变长. O3浓度日最大8 h滑动平均值（MDA8 O3）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O3浓度也表现出明显增加的趋势. ②气象因素对东营市O3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O3高值.研究期间东营市气象因素贡献了MDA8 O3变化的30%；在O3中度污染与重度污染的情况下,气象因素对MDA8 O3变化的贡献率可高达40%. ③海陆风对O3超标日的发生具有一定贡献.海陆风日午后O3浓度比非海陆风日高20 μg·m-3左右.在O3中度及重度污染日,海陆风日10：00~16：00的O3浓度比非海陆风日O3浓度高,且20：00~23：00 O3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O3浓度,为该地区的O3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O3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. |
| 英文摘要 |
| In recent years, ground-level-ozone（O3） pollution in urban areas in the Bohai Rim has attracted wide attention. Based on the analysis of the spatiotemporal distribution characteristics of O3 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 O3 concentration were evaluated. The results showed that： ① From 2017 to 2022, the annual assessment value of O3 concentration in Dongying showed a fluctuating upward trend, and the pollution days with O3 as the primary pollutant increased. O3 pollution mainly occurred in spring, summer, and autumn, with the most severe O3 pollution episodes typically occurring in May and June, and the duration of O3 pollution season tended to be longer. The monthly variation in the daily maximum 8-h average ozone （MDA8 O3） 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 O3 concentration in recent years in Dongying also showed a significant increase trend. ② Meteorological factors greatly influenced O3 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 O3 value was more likely to occur. Meteorological factors contributed 30% of the MDA8 O3 variation in Dongying during the study period. In the case of moderate and severe O3 pollution, the contribution of meteorological factors to the change in MDA8 O3 could be as high as 40%. ③ To some extent, sea-land breeze contributed to the occurrence of MDA8 O3 exceeding the secondary standard limit value of the National Ambient Air Quality Standard. In the afternoon, the hourly concentration of O3 during the sea-land breeze days was approximately 20 μg·m-3 higher than that during the non-sea-land breeze days. On the days of moderate and severe O3 pollution, the O3 concentration during the sea-land breeze days from 10：00 to 16：00 was higher than that during non-sea-land breeze days, and the O3 concentration was also at a high level from 20：00 to 23：00 on sea-land breeze days. In the O3 pollution season, the sea-land breeze could significantly affect the O3 level in coastal cities, which could bring significant challenges for O3 pollution prevention and control in this region. In the future, cities in the Bohai Rim need to further strengthen regional joint prevention and control of O3 pollution and increase emission reduction efforts of nitrogen oxides and volatile organic compounds. This strategy could effectively lower pollutant concentrations within the land breeze air mass, consequently reducing the impact of the sea breeze air mass on air quality in cities in the Bohai Rim. |
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