| 河北南部城市臭氧和VOCs的污染特征及传输贡献 |
| 摘要点击 4801 全文点击 1102 投稿时间：2022-08-27 修订日期：2022-11-21 |
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| 中文关键词 石家庄 邢台 邯郸 臭氧(O3) 挥发性有机物(VOCs) 空间传输贡献 |
| 英文关键词 Shijiazhuang Xingtai Handan ozone (O3) volatile organic compounds (VOCs) space transmission contribution |
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| 中文摘要 |
| “十四五”时期是河北南部城市（石家庄、邢台和邯郸）退出空气质量综合指数排名后10位的关键阶段.基于2020年4~10月南部城市的15个国家环境质量监测站臭氧（O3）逐时数据和3个挥发性有机物（VOCs）组分监测站的逐时数据及同期气象资料，采用时空演替、O3生成潜势（OFP）、后向轨迹模式和空间统计模型进行分析.结果表明：①南部城市4~10月O3变化呈倒"U"型分布，空间呈南高北低的格局，6月O3污染最重，其ρ（O3）依次为：邢台（233.8 μg ·m-3）>邯郸（225.2 μg ·m-3）>石家庄（224.8 μg ·m-3），O3与温度和风速呈正相关、与湿度和VOCs呈反相关；②4~10月ρ（TVOC）依次为：邢台（274 μg ·m-3）>石家庄（266 μg ·m-3）>邯郸（218 μg ·m-3），烯烃和芳香烃的总OFP占比均超过一半；③南部城市O3污染轨迹具有空间方向性和关联性，经过石家庄到邢台的轨迹ρ（O3）均值（198.92 μg ·m-3）最高，经过邯郸到达邢台的O3污染轨迹频数最多；④南部城市传输贡献上，邢台对石家庄的O3传输贡献率最高（27.39%），邯郸对邢台的VOCs传输贡献率最高（32.76%）. |
| 英文摘要 |
| The "14th Five-Year Plan" period is the key stage for southern Hebei cities (Shijiazhuang, Xingtai, and Handan) to be removed from the bottom ten of the Air Quality Composite Index. The hourly ozone (O3) data of 15 country-controlled monitoring stations in the southern cities of Hebei Province from April to October 2020, hourly data of three volatile organic compound (VOCs) supersites, and the meteorological data of the same period were used for analysis, combined with the spatiotemporal succession, O3 formation potential (OFP), backward trajectory modeling, and spatial statistical modeling. The results showed the following:firstly, the temporal variations in O3 in southern cities of Hebei Province from April to October presented an inverted "U" shape, and the spatial distribution was high in the south and low in the north. O3 pollution was the most serious in June, with Xingtai (233.8 μg·m-3)>Handan (225.2 μg·m-3)>Shijiazhuang (224.8 μg·m-3). O3 was positively correlated with temperature and wind speed and negatively correlated with humidity and VOCs; furthermore, the ρ(TVOC) from April to October followed the order of Xingtai (274 μg·m-3)>Shijiazhuang (266 μg·m-3)>Handan (218 μg·m-3). The total OFP of alkenes and aromatics accounted for more than half; moreover, the trajectory of O3 pollution in southern cities of Hebei Province showed spatial directionality and relevance. The highest mass concentration of O3 (198.92 μg·m-3) was in the trajectory from Shijiazhuang to Xingtai, and the highest frequency of O3 pollution was in the trajectory from Handan to Xingtai. Moreover, the transmission contributions of O3from Xingtai to Shijiazhuang agglomerations were high (27.39%), and Handan played a significant role in the transmission contribution of O3 to Xingtai (32.76%). |
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