煤炭燃烧所产生的有机气溶减少部分被北京煤炭燃烧禁令期间增强的二次形成所抵消
Haiyan Ni1,2,3, Haobin Zhong4, Ying Wang1
1State Key Laboratory of Loess and Quaternary Geology, Key Laboratory of Aerosol Chemistry and Physics, CAS Center for Excellence in Quaternary Science and Global Change, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710061, China.
Environmental science & technology
|May 5, 2025
概括
2017年中国北部的煤炭禁令显著减少了煤炭燃烧排放,减少了初级有机气溶 (OA),但由于增强的光化学生产,增加了二次OA形成.
科学领域:
- 大气化学 大气化学
- 环境科学 环境科学
- 空气污染研究研究
背景情况:
- 2017年,中国北部的煤炭禁令要求将住宅供暖从煤炭转换为天然气或电力.
- 这一政策转变为评估减少燃煤对有机气溶 (OA) 的影响提供了独特的研究机会.
研究的目的:
- 调查煤炭禁令对北京的OA成分,来源和大气转变的影响.
- 量化初级和二级OA分数及其贡献来源的变化.
主要方法:
- 利用在线气溶化学规范监测器 (ACSM) 进行实时OA分析.
- 采用离线14C测量来确定碳来源和转换.
- 将OA分解为主要因素 (类似碳化合物,,燃烧生物质,燃烧煤炭) 和次要因素 (氧化OA,OOA).
主要成果:
- 整体OA度下降,观察到的最显著的减少是燃煤OA.
- 有氧化OA (OOA) 的比例大幅增加 (45%至72%),表明二次气溶形成有所增强.
- 化石碳对OA的贡献下降了 (67%至55%),得到了C数据的支持,该数据显示化石OA中的水溶性碳增加.
- 在禁令期间,臭氧 (O3) 度翻了一番,与OOA正相关,表明光化学OA产量增加.
结论:
- 严格的清洁空气行动,比如煤炭禁令,有效地减少了初级有机气溶 (POA).
- 然而,POA的减少可以通过增加的二次OA形成来部分抵消.
- 光化学过程在OA形成中起着重要作用,特别是在减少初级排放的情况下.
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