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首页> 外文期刊>Atmospheric chemistry and physics >Effects of NOsubix/i/sub and SOsub2/sub on the secondary organic aerosol formation from photooxidation of iα/i-pinene and limonene
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Effects of NOsubix/i/sub and SOsub2/sub on the secondary organic aerosol formation from photooxidation of iα/i-pinene and limonene

机译：NO X / s> 和SO 2 在二级有机气溶胶中形成的效果α - 戊烯和柠檬烯的光氧化

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Anthropogenic emissions such as NOsubix/i/sub and SOsub2/sub influence the biogenic secondary organic aerosol (SOA) formation, but detailed mechanisms and effects are still elusive. We studied the effects of NOsubix/i/sub and SOsub2/sub on the SOA formation from the photooxidation of iα/i-pinene and limonene at ambient relevant NOsubix/i/sub and SOsub2/sub concentrations (NOsubix/i/sub: &?1to 20?ppb, SOsub2/sub: &?0.05 to 15?ppb). In these experiments, monoterpene oxidation was dominated by OH oxidation. We found that SOsub2/sub induced nucleation and enhanced SOA mass formation. NOsubix/i/sub strongly suppressed not only new particle formation but also SOA mass yield. However, in the presence of SOsub2/sub which induced a high number concentration of particles after oxidation to Hsub2/subSOsub4/sub, the suppression of the mass yield of SOA by NOsubix/i/sub was completely or partly compensated for. This indicates that the suppression of SOA yield by NOsubix/i/sub was largely due to the suppressed new particle formation, leading to a lack of particle surface for the organics to condense on and thus a significant influence of vapor wall loss on SOA mass yield. By compensating for the suppressing effect on nucleation of NOsubix/i/sub, SOsub2/sub also compensated for the suppressing effect on SOA yield. Aerosol mass spectrometer data show that increasing NOsubix/i/sub enhanced nitrate formation. The majority of the nitrate was organic nitrate (57–77?%), even in low-NOsubix/i/sub conditions (&??～??1?ppb). Organic nitrate contributed 7–26?% of total organics assuming a molecular weight of 200?g?molsup?1/sup. SOA from iα/i-pinene photooxidation at high NOsubix/i/sub had a generally lower hydrogen to carbon ratio (H?∕?C), compared to low NOsubix/i/sub. The NOsubix/i/sub dependence of the chemical composition can be attributed to the NOsubix/i/sub dependence of the branching ratio of the ROsub2/sub loss reactions, leading to a lower fraction of organic hydroperoxides and higher fractions of organic nitrates at high NOsubix/i/sub. While NOsubix/i/sub suppressed new particle formation and SOA mass formation, SOsub2/sub can compensate for such effects, and the combining effect of SOsub2/sub and NOsubix/i/sub may have an important influence on SOA formation affected by interactions of biogenic volatile organic compounds (VOCs) with anthropogenic emissions.
机译：诸如No x x / sex 等的人为排放，因此 2 影响生物学二次有机气溶胶（SOA）形成，但细致的机制和效果仍然难以捉摸。我们研究了NO x 和SO 2 从SOA形成的效果从α - 戊烯的光氧化和柠檬烯在环境中，相关NO x 等 2 浓度（no x ：＆lt ; 1至20？ppb，所以<亚> 2 ：＆Δ05至15？ppb）。在这些实验中，单萜氧化由OH氧化占据主导。我们发现所以 2 诱导的成核和增强的SOA大规模形成。 NO x 强烈抑制不仅是新的颗粒形成，还强制抑制SOA质量产量。然而，在SO 2 的情况下，氧化在氧化到H 2 SO 4 ，抑制质量的抑制后诱导大数量的颗粒通过NO x 的SOA产量完全或部分地补偿。这表明抑制不 X / X / s> 的SOA产量主要是由于抑制的新颗粒形成，导致有机物缺少颗粒表面，以冷凝并因此凝结蒸气壁损失对SOA质量产量的显着影响。通过补偿对NO X / s> 的成核的抑制作用，因此 2 还补偿了对SOA产量的抑制作用。气溶胶质谱仪数据显示，不增加NO x 增强型硝酸盐形成。大多数硝酸盐是有机硝酸盐（57-77〜％），即使在低 x / s>条件下也是如此（＆Δ?1？ppb）。有机硝酸盐占总有机物的7-26倍，假设分子量为200μm≤molβ1。从α - 高NO x 的SOA具有通常较低的氢气与碳比（H？/αc），与低没有 x 。化学组合物的NO x 依赖性可归因于NO x 依赖性的分支比RO 2 损失反应，导致在高NO x / s> 中的有机氢过氧化物和较高分数的有机硝酸盐。虽然NO x 抑制了新的粒子形成和SOA质量形成，因此 2 可以补偿这种效果，以及所以的结合效果2 和NO x 对受与人类发射的生物挥发性有机化合物（VOC）相互作用影响的SOA形成有重要影响。

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