Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions
Aging of biogenic secondary organic aerosol via gas-phase OH radical reactions
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DOI：
10.1073/pnas.1115186109
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发表时间：
2012-08-21
影响因子：
11.1
通讯作者：
Baltensperger, Urs
中科院分区：
文献类型：
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作者：
Donahue, Neil M.;Henry, Kaytlin M.;Baltensperger, Urs
多室气溶胶化学老化研究(MUCHACHAS)验证了羟基自由基(OH)老化显著增加第一代生物次生有机气溶胶(SOA)浓度的假设。OH是主要的大气氧化剂，而MUCHACH使用了设计非常不同的环境室，使用多个OH源来探索一系列化学条件和潜在的系统误差来源。我们分离了OH老化的影响，证实了我们的假设，同时观察到了SOA属性的相应变化。大量的增长与全球SOA源和模型中预测的源之间的现有差距是一致的，并且可以通过适合在这些模型中实现的机制来描述。
The Multiple Chamber Aerosol Chemical Aging Study (MUCHACHAS) tested the hypothesis that hydroxyl radical (OH) aging significantly increases the concentration of first-generation biogenic secondary organic aerosol (SOA). OH is the dominant atmospheric oxidant, and MUCHACHAS employed environmental chambers of very different designs, using multiple OH sources to explore a range of chemical conditions and potential sources of systematic error. We isolated the effect of OH aging, confirming our hypothesis while observing corresponding changes in SOA properties. The mass increases are consistent with an existing gap between global SOA sources and those predicted in models, and can be described by a mechanism suitable for implementation in those models.