| 运城市PM2.5时空分布特征和潜在源区季节分析 |
| 摘要点击 2725 全文点击 966 投稿时间：2021-04-16 修订日期：2021-07-06 |
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| 中文关键词 PM2.5 时空分布 后向轨迹 输送路径 潜在源区 |
| 英文关键词 PM2.5 spatiotemporal distribution backward trajectory transport pathway potential source contribution |
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| 中文摘要 |
| 基于2019年3月~2020年2月环境空气质量监测数据，分析了运城市PM2.5污染的时空分布特征，并利用HYSPLIT后向轨迹模型和聚类分析等方法探讨不同季节运城市PM2.5污染的输送路径和潜在源区.结果表明，运城市ρ（PM2.5）冬季最高（111.24 μg·m-3），夏季最低（30.02 μg·m-3），PM2.5/PM10秋冬季均大于0.6，表明运城市秋冬两季颗粒物污染以细颗粒物为主；空间上ρ（PM2.5）年均值呈现北部和中部高、东部和西部低的分布特征，高值区PM2.5与SO2、NO2和CO呈显著强相关，表明本地排放对高值区ρ（PM2.5）影响较大，春季和冬季最高值分别位于河津市（58.50 μg·m-3）和稷山县（142.33 μg·m-3），夏季最高值位于南部的平陆县（36.92 μg·m-3），秋季则为中部的盐湖区（62.94 μg·m-3）.输送分析表明，春季和冬季主要受西北向输送气团的影响，其占比可达58.69%和55.77%，夏季主要为偏东和偏南向气团，秋季来自河南西南部的短距离输送气团污染占比最大，为32.89%；潜在源区范围春夏最小，秋季开始变大，冬季范围最广且贡献最大，最主要源区春夏位于河南西部和中部，秋冬集中在陕西、河南和山西这3省交界区域以及陕西西部. |
| 英文摘要 |
| The spatiotemporal distribution characteristics of PM2.5 pollution in Yuncheng City were analyzed based on the ambient air quality monitoring data from March 2019 to February 2020, and the hybrid single-particle Lagrangian integrated trajectory (HYSPLIT) and cluster analysis were used to discuss the contamination transportation pathway and the distribution of potential pollution sources affecting PM2.5 in Yuncheng City in different seasons. The results showed that the PM2.5 concentration in Yuncheng was the highest in winter (111.24 μg·m-3) and the lowest in summer (30.02 μg·m-3). PM2.5/PM10 was greater than 0.6 in autumn and winter, indicating that the particulate matter pollution in Yuncheng City in autumn and winter was mainly fine particulate matter; spatially, the annual mean value of PM2.5 presented distribution characteristics that were high in the northern and central regions and low in the eastern and western regions. The high-value areas of PM2.5 were significantly and strongly correlated with SO2, NO2, and CO, indicating that local emissions contributed to the high values. The highest values in spring and winter were located in Hejin City (58.50 μg·m-3) and Jishan County (142.33 μg·m-3), and the highest values in summer and autumn were located in Pinglu County (36.92 μg·m-3) and the Salt Lake area (62.94 μg·m-3), respectively. Transportation analysis showed that spring and winter were mainly affected by air masses transporting northwestward, accounting for 58.69% and 55.77%. In summer, air masses were mainly eastward and southward, and in autumn, pollution was from short-distance transport air masses from southwestern Henan. The largest ratio was 32.89%; the potential source area was the smallest in spring and summer; it then began to grow in autumn, and it was the widest in the winter and had the highest contribution. The main source area in spring and summer was located in western and central Henan, and in autumn and winter, source areas were concentrated at the junction of Shaanxi, Shanxi, and Henan and west of Shaanxi. |
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