| 京津冀典型城市冬季人为源减排与气象条件对PM2.5污染影响 |
| 摘要点击 2868 全文点击 846 投稿时间：2020-11-25 修订日期：2021-03-07 |
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| 中文关键词 PM2.5 水溶性无机离子 区域传输 来源解析 气象影响 |
| 英文关键词 PM2.5 water soluble inorganic ions regional transport source apportionment meteorological changes |
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| 中文摘要 |
| 本研究基于采样分析与WRF-CAMx-PSAT模式分析了2018年1月北京和唐山PM2.5的组分特征、传输特征和来源解析.结果表明，2018年1月北京和唐山水溶性无机离子占PM2.5质量浓度的49.59%和39.13%，两地NO3-/SO42-分别为2.02和1.51，均受移动源主导，北京和唐山PM2.5外来贡献分别占总浓度的48.74%和30.67%，除此之外主要受到邻近局地、西北通道和西南通道这3个方面的污染输送.在污染日时段，两地受西南通道污染贡献分别上升9.65%和15.02%.北京PM2.5污染浓度贡献最大的是移动源和扬尘源，二次离子受区域输入影响较为明显，唐山则以移动源和工业源为主，且一次颗粒物和SO42-的本地贡献十分显著.与2013年相比，水溶性离子主导组分由SO42-向NO3-转变，主要污染源由燃煤源和工业源向移动源和扬尘源转变，同时2018年气象条件对于污染的缓解也比2013年更为有利，其中二次离子的气象影响变化与这两年的相对湿度变化差异紧密相关. |
| 英文摘要 |
| This study used sampling analysis and a CAMx-PSAT coupling model to analyze the components, transmission, and source apportionment of PM2.5 in Beijing and Tangshan in January 2018. The results showed that in January 2018, water-soluble inorganic ions (WSⅡs) accounted for 49.59% and 39.13% of PM2.5 mass concentrations in Beijing and Tangshan, respectively. The ratios of NO3- to SO42- were 2.02 and 1.51, respectively, indicating that pollution in both cities was dominated by mobile sources. In Beijing and Tangshan, PM2.5 accounted for 48.74% and 30.67% of transmission, respectively. Regional transmissions were mainly contributed by neighboring areas, northwest masses, and southwest masses. However, the contribution of the southwest passage to pollution in the respective cities increased by 9.65% and 15.02% during pollution periods. The principal sources contributing to PM2.5 pollution in Beijing were mobile and dust sources. Secondary ions were more obviously affected by regional contributions, mobile and industrial sources had the most significant effect in Tangshan, and most particulate matter and sulfate were contributed by local emissions. From 2013 to 2018, the dominant component of WSⅡs changed from sulfate to nitrate while the main pollution sources changed from coal-fired and industrial sources to mobile and dust sources. Meanwhile, in January 2018, the meteorological factors were more favorable for pollution mitigation than in 2013. The meteorological impact of secondary ions is closely related to the lower relative humidity in 2018, compared to 2013. |
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