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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Ultrafine particle size distributions measured in aircraft exhaust plumes
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Ultrafine particle size distributions measured in aircraft exhaust plumes

机译：在飞机尾气羽流中测量的超细粒度分布

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摘要

Fast-response measurements of particle size distributions were made for the first time in the near-field plume of a Boeing 737-300 aircraft burning fuel with fuel sulfur (S) contents (FSCs) of 56 and 2.6 ppmm, as well as in fresh and dissipating contrails from the same aircraft, using nine particle counters operating in parallel. Nonsoot particles were present in high concentrations, with number maxima at diameters less than or equal to3 nm. From these and ancillary measurements we determined the apparent emission index, EI*, or amount produced per kilogram of fuel burned, for particle number, surface, and volume, and the value of eta*, the apparent fraction of fuel S found in the particulate phase in the plume assuming the particles were composed of sulfuric acid and water. All of these parameters were functions of the age of the plume since emission, FSC, and presence or absence of contrail. The measurements support the use of values of eta* of <10% in numerical models of the effects of the current aircraft fleet on the atmosphere, suggest that non-S species become important contributors to particulate mass at very low FSCs, and place significant constraints on numerical models of plume microphysical processes. [References: 47]
机译：波音737-300飞机的近场羽流首次快速测量了粒径分布，该飞机燃烧的燃料中硫（S）含量（FSC）分别为56和2.6 ppmm，以及新鲜的并使用9个并行运行的粒子计数器消散同一架飞机上的凝结尾迹。非烟灰颗粒以高浓度存在，最大直径小于或等于3 nm。通过这些和辅助测量，我们确定了表观排放指数，EI *或每千克燃烧的燃料的生产量，包括颗粒数量，表面和体积，以及eta *的值，即颗粒中燃料S的表观分数假设颗粒由硫酸和水组成，则羽流中的气相。由于排放，FSC和存在或不存在转换轨迹，所有这些参数都是羽流年龄的函数。这些测量结果支持在当前飞机机队对大气影响的数值模型中使用eta * <10％的值，表明非S物种在非常低的FSC时成为颗粒质量的重要贡献者，并施加了明显的限制羽微物理过程的数值模型。 [参考：47]

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