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Estimation of the contribution of secondary organic aerosol to PM2.0 concentration in aircraft cabins

机译：估算机舱中次级有机气溶胶对PM2.0浓度的贡献

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摘要

Ozone (O_3) and many kinds of reactive organic compounds (ROGs) are commonly found in aircraft cabins. Thus the secondary organic aerosol (SOA) which form as the products of oxidative reactions with ROGs may be an important potential source of fine particles in aircraft cabins. This study aims to estimate the contribution of SOA to the concentration of PM2.0 (particles with aerodynamic diameter less than 2.0 μm) in aircraft cabins. Based on the measurements of O_3 and ROGs concentration in the aircraft cabins of five flights in China, a SOA formation model was employed to estimate the concentration of SOA generated from the oxidation of ROGs. O_3 concentration, the fraction of organic aerosol (OA) mass (sum of organic aerosol components from outdoor sources (OOA), organic aerosol components emitted by primary indoor sources (POA) and SOA), the concentration of the PM2.0 and the deposition rate of particle matter (PM) that affecting SOA generation were investigated. The results show that the SOA contribution could reach to 56% in some cases, the average SOA contribution ranges from zero to 20% for the five studied flights. The O_3 concentration, POA mass fraction and the concentration of PM2.0 are all important factors influencing the SOA contribution. The deposition rate of PM has little effect on the SOA generation.
机译：臭氧（O_3）和多种反应性有机化合物（ROG）通常在机舱中发现。因此，作为与ROG发生氧化反应的产物而形成的次级有机气溶胶（SOA）可能是机舱中细颗粒的重要潜在来源。这项研究旨在评估SOA对机舱中PM2.0（空气动力学直径小于2.0μm的颗粒）浓度的贡献。基于对中国五次飞行的机舱中O_3和ROGs浓度的测量，采用SOA形成模型估算了ROGs氧化产生的SOA浓度。 O_3浓度，有机气溶胶（OA）质量分数（室外来源（OOA）的有机气溶胶成分之和，室内主要来源（POA）和SOA排放的有机气溶胶成分之和），PM2.0的浓度和沉积研究了影响SOA生成的颗粒物（PM）速率。结果表明，在某些情况下，五个研究航班的SOA贡献率可能达到56％，平均SOA贡献率从零到20％不等。 O_3浓度，POA质量分数和PM2.0浓度都是影响SOA贡献的重要因素。 PM的沉积速率对SOA的产生影响很小。

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