气溶形成的依赖性在潮湿条件下来自m-烯的OH基源
Qun Zhang1, Yongfu Xu2, Long Jia3
1State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; Department of Atmospheric Chemistry and Environmental Sciences, College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; School of Environment, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou, 310024, China.
基基 (OH) 的来源显著影响二次有机气溶 (SOA) 的形成. 作为OH前体的过氧化 (H2O2),在高湿度下降SOA产量,与臭氧 (O3) 不同.
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:
- 基 (OH) 对于二次有机气溶 (SOA) 的形成至关重要.
- 不同OH前体在不同湿度下对SOA产生的影响尚不清楚.
研究的目的:
- 为了研究两个OH前体,过氧化 (H2O2) 和臭氧 (O3) 对SOA产量和由m-xylen光氧化产生的成分的影响.
- 在干燥和潮湿条件下比较SOA形成.
主要方法:
- 光氧化实验是在使用m-xylen与H2O2或O3.3进行的特龙反应堆中进行的.
- 使用Orbitrap质谱仪分析了SOA产量和化学成分.
- 实验在一系列相对湿度 (RH) 水平上进行.
主要成果:
- 在m-xylen-H2O2系统中,随着RH的增加,SOA产量显著下降 (29.8%在6%RH下降至3.8%在78%RH下降).
- 在m-xylen-O3系统中,SOA产量在RH变化中保持相对稳定 (7.0-9.6%在5-6%RH和8.6-9.9%在68-87%RH).
- H2O2系统的产量减少是由于溶解的H2O2光解中的OH过量增加的碎片化和挥发性.
结论:
- 选择OH前体对SOA形成路径和湿度依赖产生了关键影响.
- 臭氧驱动的SOA形成似乎比H2O2驱动的形成更适应湿度变化.
- 这些发现对于准确的大气建模和了解空气质量影响至关重要.
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