在印度-河平原稳定Criegee中间体的来源,水槽和化学成分
Muhammed Shabin1, Ashish Kumar1, Haseeb Hakkim1
1Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S Nagar, Manauli PO, Punjab 140306, India.
The Science of the total environment
|July 5, 2023
概括
南亚的夜间氧化受稳定基基介质 (SCI) 的影响,乙烯和等基是关键的前体. 农作物燃烧事件显著提高SCI的生产,影响硫酸盐气溶的形成.
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:
- 夜间的氧化对空气质量至关重要,但在南亚地区人们对其了解甚少.
- 稳定Criegee中间体 (SCI) 在大气氧化过程中发挥着重要作用.
- 关于SCI前体及其在印度河平原 (IGP) 的影响的数据有限.
研究的目的:
- 调查夏季印度-河流平原 (IGP) 中稳定介质 (SCI) 的化学成分和丰富性.
- 确定主要的烯前体及其对SCI形成的贡献.
- 评估污染事件,如作物燃烧对SCI度和化学的影响.
主要方法:
- 在IGP大气中对SCI前体和沉积物的全面测量.
- 应用化学稳定状态模型来计算SCI度.
- 分析烯物种化及其在正常和受污染时期在SCI生产中的作用.
主要成果:
- 在IGP中首次报告了各种 (乙烯,烯,丁烯,烯,六) 的夏季水平.
- 平均计算的SCI度为4.4×103分子cm−3,主要物种为Z-CH3CHOO.
- 在作物燃烧期间,SCI生产率显著上升 (2.1 倍),其中转2-丁烯是关键贡献者.
- SCI 主导的二氧化硫氧化,可能形成显著的微型硫酸盐气溶.
结论:
- 基,特别是乙烯,基和1-丁基,是IGP中SCI的重要前体.
- 农作物燃烧的污染大大提高了SCI的产量,并影响了大气化学.
- 由SCI驱动的SO2氧化是IGP中硫酸盐气溶形成的主要途径,特别是在生物质燃烧过程中.
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