A unified model for ultrafine aircraft particle emissions
A unified model for ultrafine aircraft particle emissions
复制标题
超细飞机颗粒排放的统一模型
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
R. Busen
中科院分区：
文献类型：
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作者：
B. Kärcher;R. Turco;F. Yu;M. Danilin;D. Weisenstein;R. Miake;R. Busen
为了预测商业航空对环境的影响，已经开展了深入的研究，以测量飞机排放物的性质和影响。这些观测结果表明，在排气羽流中产生的颗粒的数量和大小方面存在着极大的差异。分析参数化，解释了大部分的观测方差。结果表明，所观察到的挥发性颗粒物的排放指数的分散主要是由于羽烟年龄的变化，粒子计数器的检测阈值大小，和可冷凝的有机排放。挥发性颗粒浓度随燃料硫含量变化的主要趋势可以用硫在排放时转化为颗粒硫酸的比例在0.5 - 5%范围内来解释。一个新的评估平流层气溶胶层的扰动，未来的超音速飞机机队证实了以前的估计，并把这些模拟的一个健全的物理基础。
To predict the environmental impacts of commercial aviation, intensive studies have been launched to measure the properties and effects of aircraft emissions. These observations have revealed an extremely wide variance with respect to the number and sizes of the particles produced in the exhaust plumes. An analytic parameterization is presented that explains most of the observational variance. It is shown that the observed scatter in emission indices of volatile particles is due mainly to variations of plume age, the detection threshold size of the particle counters, and condensable organic emissions. The principle trend of the volatile particle concentrations with fuel sulfur content can be explained with conversion fractions of sulfur into particulate sulfuric acid at emission within the range 0.5 to 5%. A novel assessment of the perturbation of the stratospheric aerosol layer by a future supersonic aircraft fleet confirms previous estimates and puts these simulations on a sounder physical basis.