Chemical transport of neutral atmospheric constituents by waves and turbulence: Theory and observations
Chemical transport of neutral atmospheric constituents by waves and turbulence: Theory and observations
复制标题
波浪和湍流对中性大气成分的化学传输：理论和观察
DOI：
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
A. Liu
中科院分区：
文献类型：
--
作者：
C. Gardner;A. Liu
当某个物种的化学扰动引起的密度波动与垂直风波动密切相关时，就会发生垂直化学输送。化学传递可以超过化学活性物质的动力和涡流传递。推导了化学通量和传输速度的理论表达式，并用于表征 85 至 100 km 之间中层 O3 以及大气 Na 和 Fe 的垂直传输。化学传输取决于温度波动的固有频谱和物种的化学截止期。对于 O3，只有高频波动有助于化学传输，因为较慢、较大振幅的密度扰动会被化学物质抑制。 O3 的截止时间范围从光解作用很重要的白天约 15 分钟到夜间约 200 分钟。 Na和Fe的化学传输速度与85km以上的O3、O2+和NO+密度成正比。对于 O3、Na 和 Fe，垂直传输速度的大小可高达 10cm/s，并且它们表现出强烈的昼夜变化。 O3 化学输送在夜间向下，白天向上。 Na和Fe的化学输送主要是向上的，在夜间接近85和100公里时向上的速度最强。
Vertical chemical transport occurs when the density fluctuations of a species, caused by perturbations of its chemistry, are strongly correlated with the vertical wind fluctuations. Chemical transport can exceed dynamical and eddy transport of chemically active species. Theoretical expressions are derived for the chemical fluxes and transport velocities and used to characterize the vertical transport of mesospheric O3 and meteoric Na and Fe between 85 and 100 km. Chemical transport is dependent on the intrinsic frequency spectrum of the temperature fluctuations and on the chemical cutoff periods of the species. For O3 only high‐frequency fluctuations contribute to chemical transport because slower, larger‐amplitude density perturbations are damped by chemistry. The cutoff periods for O3 range from ~15 min during the day when photolysis is important to ~200 min at night. The chemical transport velocities of Na and Fe are proportional to the O3, O2+, and NO+ densities above 85 km. For O3, Na, and Fe the magnitudes of the vertical transport velocity can be as large as 10 cm/s, and they exhibit strong diurnal variations. O3 chemical transport is downward at night and upward during the day. Na and Fe chemical transport are largely upward with the strongest upward velocities at night near 85 and 100 km.
DOI：
10.1002/jgrd.50708
发表时间：
2013-08
期刊：
Journal of Geophysical Research: Atmospheres
影响因子：
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作者：
W. Feng;D. Marsh;M. Chipperfield;D. Janches;J. Höffner;F. Yi;J. Plane
通讯作者：
W. Feng;D. Marsh;M. Chipperfield;D. Janches;J. Höffner;F. Yi;J. Plane
流星烧蚀的化学模型
影响因子：
6.3
作者：
Vondrak T
通讯作者：
Vondrak T