Microphysical Modeling of Ground-Level Aircraft-Emitted Aerosol Formation: Roles of Sulfur-Containing Species
Microphysical Modeling of Ground-Level Aircraft-Emitted Aerosol Formation: Roles of Sulfur-Containing Species
复制标题
地面飞机排放气溶胶形成的微物理模型：含硫物质的作用
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
I. Waitz
中科院分区：
文献类型：
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作者：
H. Wong;Paul E. Yelvington;M. Timko;T. Onasch;R. Miake;Jianye Zhang;I. Waitz
飞机发动机的颗粒物排放由于其对气候、健康和区域空气质量的影响而受到越来越多的关注。然而，对飞机排放物在地面形成颗粒物的认识仍然有限。在这项工作中，一个详细的，一维模型，包括羽流化学，尾流稀释，气溶胶微物理研究含硫气溶胶形成近场飞机羽流在地面水平。参数研究的环境条件和发动机运行参数进行了以下的中心线羽流轨迹下游1公里。还对最近一次实验测量活动（美国航天局APEX-1）中使用的取样系统进行了调查。结果表明，H2SO 4 -H2O二元均质成核对环境条件敏感，碳烟上的非均质凝结与发动机功率有关。结果还表明，在某些大气条件下，来自实验采样系统的观测结果在中等（例如，30 m）下游位置可能不代表更下游的颗粒演变。与实验数据的比较提供了一个有限的初步评估模型。这一评估表明，重要的物理被捕获，该模型可用于解释实验结果，并帮助指导未来的实地测量方向。
Particulate matter emissions from aircraft engines have received increased attention due to their impacts on climate, health, and regional air quality. However, understanding of particulate matter formation from aircraft emissions at ground level is still limited. In this work, a detailed, one-dimensional model consisting of plume chemistry, wake dilution, and aerosol microphysics was developed to study sulfur-containing aerosol formation in near-field aircraft plumes at ground level. Parametric studies of ambient conditions and engine operating parameters were performed following the centerline plume trajectories up to 1 km downstream. The sampling system used in a recent experimental measurement campaign (NASA APEX-1) was also investigated. Our results show that binary homogeneous nucleation of H 2 SO 4 -H 2 O is sensitive to ambient conditions, and heterogeneous condensation on soot is dependent on engine power. The results also suggest that at certain atmospheric conditions the observations from the experimental sampling system at moderate (e.g., 30 m) downstream locations may not represent the particle evolution further downstream. A comparison with experimental data provided a limited initial assessment of the model. This assessment suggests that the important physics are being captured, and the model may be used to interpret experimental results and help guide future directions of field measurements.