Decay times of transitionally dense specularly reflecting meteor trails and potential chemical impact on trail lifetimes
Decay times of transitionally dense specularly reflecting meteor trails and potential chemical impact on trail lifetimes
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DOI：
10.5194/angeo-34-1119-2016
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发表时间：
2016-12
影响因子：
1.9
通讯作者：
W. Hocking;R. Silber;J. Plane;W. Feng;Marcial Garbanzo-Salas
中科院分区：
文献类型：
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作者：
W. Hocking;R. Silber;J. Plane;W. Feng;Marcial Garbanzo-Salas
抽象的。使用镜面反射干涉技术的雷达对过渡致密流星轨迹的研究表明，在这些流星轨迹形成后十分之几秒的时间尺度上，存在可测量的高温化学物质。这是一个与环境温度化学不同的过程，在长寿命的轨迹中，已知的环境温度化学存在于数十秒或更长的时间尺度上。因此，如果扩散是降低平均尾迹电子密度的唯一机制，这些过渡致密的轨迹的寿命可能会比预期的要短。用4台SKiYMET雷达在纬度从10°N到75°N范围内每天24小时研究了这一过程，历时10多年。在本文中，我们提出了用来表示这一行为的最佳参数，并展示了这些参数的时间和纬度变化的特征。季节、昼夜和纬度的变化与中上层臭氧的相应变化密切相关。对这些影响的可能原因进行了讨论，但对任何因果关系的进一步调查仍是正在进行的研究的主题。
Abstract. Studies of transitionally dense meteor trails using radars which employ specularly reflecting interferometric techniques are used to show that measurable high-temperature chemistry exists at timescales of a few tenths of a second after the formation of these trails. This is a process which is distinct from the ambient-temperature chemistry that is already known to exist at timescales of tens of seconds and longer in long-lived trails. As a consequence, these transitionally dense trails have smaller lifetimes than might be expected if diffusion were the only mechanism for reducing the mean trail electron density. The process has been studied with four SKiYMET radars at latitudes varying from 10 to 75° N, over a period of more than 10 years, 24 h per day. In this paper we present the best parameters to use to represent this behaviour and demonstrate the characteristics of the temporal and latitudinal variability in these parameters. The seasonal, day–night and latitudinal variations correlate reasonably closely with the corresponding variations of ozone in the upper mesosphere. Possible reasons for these effects are discussed, but further investigations of any causative relation are still the subject of ongoing studies.