| 京津冀地区2015~2022年PM2.5-O3复合污染特征及影响因素分析 |
| 摘要点击 4041 全文点击 686 投稿时间：2024-07-12 修订日期：2024-09-21 |
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| 中文关键词 PM2.5-O3复合污染 京津冀（BTH）地区 气象 通风系数 二次PM2.5 |
| 英文关键词 PM2.5-O3 complex pollution Beijing-Tianjin-Hebei（BTH） region meteorology ventilation coefficient secondary PM2.5 |
| DOI 10.13227/j.hjkx.202407125 |
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| 中文摘要 |
| 基于2015~2022年PM2.5和臭氧（O3）每小时浓度数据和气象再分析数据,在出现O3污染的情况下,根据PM2.5浓度将复合污染天分为轻度、中度和重度,研究了京津冀地区不同程度复合污染的时间演化和气象条件特征. 结果表明,轻度、中度和重度复合污染天数分别为149、120和52 d,主要集中在4月和6月. 气象因子的变化能影响污染物浓度,类似于O3生成条件,高温、强太阳辐射和低湿度条件也能促进复合污染. 此外,大范围和高强度的下沉气流进一步加重复合污染. 重度复合污染的通风系数大于中度复合污染,表明外来污染物的输入可能是加重复合污染的重要因素,复合污染强度增强的同时还会伴随着二次PM2.5贡献率的显著上升. |
| 英文摘要 |
| Based on hourly concentration data of PM2.5 and ozone （O3） from 2015 to 2022, as well as meteorological reanalysis data, this study categorized complex pollution days into light, moderate, and severe based on PM2.5 concentration in the presence of O3 pollution. It examined the temporal evolution and meteorological characteristics of different levels of complex pollution in the Beijing-Tianjin-Hebei （BTH） Region. The results indicated that the number of light, moderate, and severe complex pollution days were 149, 120, and 52, respectively, primarily concentrated in April and June. Changes in meteorological factors can affect pollutant concentrations, similar to O3 formation conditions, high temperatures, strong solar radiation, and low humidity-facilitated complex pollution as well. Additionally, extensive and intense downdrafts further exacerbated complex pollution. The ventilation coefficient for severe complex pollution was higher than that for moderate pollution, suggesting that the transportation of pollutants may be a key factor in exacerbating complex pollution. The intensification of complex pollution was accompanied by a substantial increase in the contrabution rate of secondary PM2.5. |
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