| 武汉军运会前后大气PM2.5化学组分和来源 |
| 摘要点击 1595 全文点击 427 投稿时间：2022-12-06 修订日期：2023-02-17 |
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| 中文关键词 武汉军运会 细颗粒物 管控措施 实时源解析 浓度权重轨迹 区域传输 |
| 英文关键词 Wuhan Military World Games fine particulate matter control measure real-time source apportionment concentration weighted trajectory regional transportation |
| 作者 | 单位 | E-mail | | 刘世豪 | 中国地质大学(武汉)环境学院, 武汉 430074 | shihao@cug.edu.cn | | 孔少飞 | 中国地质大学(武汉)环境学院, 武汉 430074
湖北省大气复合污染研究中心, 武汉 430074 | kongshaofei@cug.edu.cn | | 郑煌 | 中国地质大学(武汉)环境学院, 武汉 430074
湖北省大气复合污染研究中心, 武汉 430074 | | | 陈楠 | 湖北省大气复合污染研究中心, 武汉 430074
湖北省生态环境监测中心站, 武汉 430074 | | | 祝波 | 湖北省大气复合污染研究中心, 武汉 430074
湖北省生态环境监测中心站, 武汉 430074 | | | 祁士华 | 中国地质大学(武汉)环境学院, 武汉 430074
湖北省大气复合污染研究中心, 武汉 430074 | |
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| 中文摘要 |
| 基于第七届世界军人运动会前后武汉大气细颗粒物（PM2.5）及其化学组分的在线监测数据，分析了管控前、管控期和管控后PM2.5的质量浓度和化学组分，并通过PMF结合后向轨迹的聚类分析和浓度权重轨迹开展来源解析.研究揭示了军运会前后武汉市PM2.5对本地和周边区域管控措施的响应，可为PM2.5的区域精准防控提供依据.在减排措施影响下，管控期间ρ（PM2.5）为（31.3±12.0）μg·m-3，比管控前降低14.7%；而二次组分有明显生成，其中硫酸盐、硝酸盐和铵盐（SNA）质量浓度升高25.6%.管控后由于湿度降低和西北气团的影响，SNA的质量浓度降低36.9%，矿质元素的质量浓度升高4.7倍.源解析表明管控前后机动车尾气的整体贡献率变化不显著（P<0.05）.管控期工业排放和燃煤贡献分别较非管控期降低68.1%和43.7%，二次源贡献上升89.5%.由于并未针对机动车尾气采取大规模控制，管控期NO3-和NOx的质量浓度分别升高了6.13 μg·m-3和3.56 μg·m-3，机动车尾气的峰值[（10.9±3.67）μg·m-3]出现在21：00，与管控期间货运车辆仅在夜间被允许通行有关.长江武汉段的禁航导致长江中下游航道船舶排放降低48.8%.长江安徽段附近存在开放源和工业排放的高值区域，反映了沿江密集分布的工业活动和道路运输.管控后开放源贡献量升高6.6倍，源区主要分布在襄阳和荆门. |
| 英文摘要 |
| Hourly monitoring datasets of PM2.5 mass concentration and associated chemical compositions were used to investigate the variations in their mass concentrations before, during, and after the 7th Military World Games held in Wuhan. Furthermore, the source analysis was conducted through PMF combined with the backward trajectory and concentration weighted trajectory cluster analysis. The study revealed the variations in PM2.5 compositions and sources around the Wuhan Military Games period and their response to local and surrounding regional control measures. This can provide a reference for regional precise prevention and control of PM2.5. Under the influence of emission reduction measures, PM2.5 mass concentration during the control period [(31.3±12.0) μg·m-3] decreased by 14.7% compared with that before the control period, whereas the secondary components were obviously formed, in which sulfate, nitrate, and ammonium(SNA) increased by 25.6% in total. After the control period, owing to the decrease in humidity and the influence of the northwest air mass, the mass concentration of SNA decreased by 36.9%, whereas the mass concentration of mineral elements increased by 4.7 times. The source apportionment results indicated that there was no significant difference between the vehicle emissions before and after the control(P<0.05). Compared with that in the non-control period, the contributions of industrial emission and coal burning decreased by 68.1% and 43.7%, respectively, whereas the contribution of secondary inorganic aerosol increased by 89.5%. With the lack of large-scale control of vehicle emissions, the mass concentrations of NO3- and NOx increased by 6.13 μg·m-3 and 3.56 μg·m-3, respectively. The vehicle emissions peaked at 21:00 [(10.9±3.67) μg·m-3], reflecting the emissions of cargo vehicles, which were only allowed to pass at night during the control period. With the banning of ship navigation, the ship emission in the middle and lower reaches of the Yangtze River significantly decreased(48.8%). There were also high values of fugitive dust and industrial emissions near the Anhui section of the Yangtze River waterway, which reflected the dense distribution of industrial activities and road transportation along the Yangtze River. After the control period, the fugitive dust increased by 6.6 times, and the source areas were mainly distributed in Xiangyang and Jingmen. |
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