关于芳香碳化合物氧化产品的无依赖产量的实验见解
Mengdi Song1,2, Xin Li1,3, Hendrik Fuchs4,5
1State Key Laboratory of Regional Environment and Sustainability, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, P. R. China.
低氧化物 (NO) 条件显著影响芳香碳化合物的氧化,影响城市空气质量. 这项研究揭示了关键产品产量,并突出了与当前大气模型的差异.
科学领域:
- 大气化学 大气化学
- 空气污染研究研究
- 有机地化学 有机地化学
背景情况:
- 芳香碳化合物是城市臭氧和二次有机气溶的关键前体.
- 它们的氧化机制,特别是在低氧化 (NO) 条件下,尚未完全理解.
- 了解这些反应对于空气质量和气候变化缓解至关重要.
研究的目的:
- 为了研究在不同低NO度下的主要芳香碳化合物氧化产物的产量.
- 为了评估这些产品产量的NO依赖性.
- 将实验结果与主化学机制 (MCMv3.3.1) 进行比较,并确定模型的差异.
主要方法:
- 利用SAPHIR室进行受控氧化实验.
- 最初的氧化 (NO) 度从每万亿分之150 (ppt) 到每十亿分之20 (ppb) 变化.
- 托卢和m-xylen的特定氧化产物的量化产量,包括来自有机过氧基的双循环和H转移路径 (RO2) 的产量.
主要成果:
- 二烯氧化产品的低NO产量包括甲 (8%),类产品 (21%),双环开放 (45%),双环保持 (6%) 和H转移 (6%).
- 来自自行车路径的产量对NO度表现出最强的敏感性.
- 在实验产量和MCMv3.3.1模拟之间观察到大量的差异,包括和m-xylen氧化产品.
- 在模型中缺少的H转移RO2反应产物对碳封闭有很大 (5-8%) 的贡献.
结论:
- 这项研究揭示了在低NO条件下关键的芳碳化合物氧化途径,这对于准确的空气质量建模至关重要.
- 现有的大气模型,如MCMv3.3.1,需要改进以捕捉观察到的产品分布,特别是关于H转移反应.
- 这些机制的准确表现对于预测城市臭氧和二次有机气溶形成至关重要.
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