Role of aircraft soot emissions in contrail formation
Role of aircraft soot emissions in contrail formation
复制标题
飞机烟灰排放在尾迹形成中的作用
DOI：
10.1029/2008gl036649
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发表时间：
2009
影响因子：
5.2
通讯作者：
Fangqun Yu
中科院分区：
文献类型：
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作者：
B. Kärcher;Fangqun Yu
利用羽流微物理模型研究了年轻尾迹微物理特性对飞机烟尘排放变化的敏感性。液体羽流和周围的颗粒与排气烟灰颗粒竞争形成尾迹冰颗粒，假设烟灰颗粒被激活成水滴之前均匀冻结。烟灰控制冰的形成，在凝结尾迹的高数量的排放指数，包括目前的全球舰队的价值观的范围。从平均水平5 × 1014 − 1015（kg − fuel）−1减少五倍的碳烟排放量大约使初始轨迹的可见光深度减半。进一步的烟灰减少在远低于形成阈值温度的温度下逆转了这一趋势，除非硫和有机物的排放量大幅减少。是否以及在何种程度上减少烟尘排放有助于减轻尾迹气候影响取决于随后的飞机尾涡处理的尾迹和他们的发展成为尾迹卷云。
The susceptibility of microphysical properties of young contrails to changes in aircraft soot emissions is studied with a microphysical plume model. Liquid plume and ambient particles compete with exhaust soot particles for the formation of contrail ice particles, assuming that soot particles are activated into water droplets prior to homogeneous freezing. Soot controls ice formation in contrails for high number emission indices including the range of current global fleet values. A fivefold reduction of soot emissions from average levels of 5 × 1014 − 1015 (kg‐fuel)−1 approximately halves the initial contrail visible optical depth. Further soot reduction reverses this trend at temperatures well below the formation threshold temperature unless emissions of sulfur and organics are cut substantially. Whether and to which degree reductions in soot emissions help mitigate the contrail climate impact depends on subsequent aircraft wake vortex processing of contrails and their development into contrail cirrus.