Mechanism of the NO3 induced Oxidation of Terpenes in air: formation of Organic Nitrates and Secondary organic aerosol (MONOTONS)

生物排放的萜烯的夜间氧化在很大程度上是通过与NO3自由基（本身主要是人为来源）反应而引发的，并且是有机硝酸盐和二次有机气溶胶（SOA）的重要来源。因此，生物圈排放和人为污染物排放的这种结合对气候和人类健康都有影响。到目前为止，确定有机硝酸盐和二次有机气溶胶的产量的复杂反应机制的定量描述是失踪的许多萜烯，并没有进行详细的实验研究，其中一个以上的萜烯是本，这是在真实的大气中的情况下的多组分系统。为了提高我们对硝酸根氧化萜烯的理解，我们提出了一系列实验室调查，使用连接到1000 L模拟室的最先进的分析工具。实验的目标萜烯的数据是稀疏或不存在的，对萜烯或萜烯/异戊二烯混合物的数据是不可用的。改变实验条件以改变所形成的中间体硝基-过氧自由基的命运，从而改变SOA的最终产物分布和产率。这两个申请人及其工作组在这一领域拥有丰富的专业知识，并汇集了一套大型仪器，以接近封闭的系统进行研究，包括用于表征气相和气溶胶相的质谱，光学和色谱工具。所获得的结果将使我们对夜间生物排放氧化的作用有新的认识，并将有助于分析和解释现有实地活动的数据。

The nighttime oxidation of biogenically emitted terpenes is initiated to a large extent by reaction with the NO3 radical (itself mainly of anthropogenic origin) and is an important source of both organic nitrates and secondary organic aerosol (SOA). This coupling of emissions from the biosphere and anthropogenic pollutants therefore has an impact both on climate and human health. To date, a quantitative description of the complex reaction mechanisms that determine the yields of organic nitrates and secondary organic aerosol is missing for many terpenes and has not been studied experimentally in detail for multi-component systems in which more than one terpene is present, which is the situation in the real atmosphere. In order to improve our understanding of the oxidation of terpenes by the nitrate radical we propose a series of laboratory investigations using state-of-the-art analytical tools connected to a 1000 L simulation chamber. The experiments target terpenes for which data are sparse or non-existent and pairs of terpenes or terpene / isoprene mixtures for which no data is available. The experimental conditions will be varied to modify the fate of the intermediate nitrooxy-peroxy radicals formed and thus the final product distribution and yields of SOA. The two applicants, together with their working groups, have great expertise in this area and bring together a large suite of instruments to provide near-closure on the systems to be investigated including mass-spectrometric, optical and chromatographic tools for characterization of both the gas- and aerosol phases. The results obtained will give us new insight into the role of nighttime oxidation of biogenic emissions and will help analyze and interpret the data from existing field campaigns.