在现实驾驶条件下,来自车辆非尾管排放的二次有机气溶形成潜力
Jinsheng Zhang1, Jianfei Peng1, Ainan Song1
1Tianjin Key Laboratory of Urban Transport Emission Research, College of Environmental Science and Engineering, Nankai University, Tianjin 300071, China.
Environmental science & technology
|February 23, 2024
概括
非尾管交通排放有助于城市二次有机气溶 (SOA). 现实世界的研究显示,SOA的形成比实验室测试高,强调了被忽视的排放来源.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 气溶科学 气溶科学
背景情况:
- 交通排放是城市地区二次有机气溶 (SOA) 的主要来源.
- 现有的研究主要集中在排气管排放上,对非排气管排放对SOA形成的影响不太了解.
研究的目的:
- 调查和量化非排气管排放对城市环境中SOA形成的贡献.
- 在现实城市环境和实验室模拟中观察到的SOA形成之间的差异.
主要方法:
- 进行了封闭研究,结合城市道实验和动力计测试.
- 使用氧化流反应堆进行现场光氧化实验.
- 分析了排放档案,包括特定的有机气体,以确定来源.
主要成果:
- 现实世界车队SOA形成潜力 (639 ± 156毫克/公斤燃料-1) 显著高于重建的实验室结果 (188毫克/公斤燃料-1).
- 在道排放中确定了不同的有机气体配置文件,包括C6-C9芳香物,C11-C16物种和,表明非尾管来源.
- 高排放事件 (14%),蒸发排放 (20%) 和青/轮胎磨损 (10%) 对SOA预算的估计贡献.
结论:
- 非尾管排放在城市SOA形成中起着关键的,被低估的作用.
- 高排放事件和各种非排气管来源对SOA负担作出了重大贡献,解释了现场和实验室研究之间的差距.
- 未来的研究和排放控制战略应针对非尾管排放源,以有效地管理城市空气质量.
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