Remote sensing of the large-scale circulation of atomic oxygen
Remote sensing of the large-scale circulation of atomic oxygen
复制标题
原子氧大范围环流的遥感
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
R. Roble
中科院分区：
文献类型：
--
作者：
G. Shepherd;Guiping Liu;R. Roble
对原子氧绿线气辉557.7 nm的观测始于1923年英国瑞利四世勋爵。大气的大尺度环流现在是众所周知的，它产生了一个冬冷冬暖的中气层顶。相应的原子氧输运应在冬季产生较高的气辉发射率，在夏季产生较低的气辉发射率。因此，遥感气辉观测有可能提供热层大尺度环流的记录。本文利用高层大气研究卫星上的风成像干涉仪（WINDII）的数据和TIME-GCM模式的模式结果，并利用早期的地面结果，对大尺度环流的特征进行了搜索。然而，这种循环的特征并不容易找到。在热带地区，确定了明确的排放率半年变化；这似乎是日潮半年变化的结果。在中高纬度地区，发现了明显的年变化，两个半球的排放率在秋季达到最大值。在更高的纬度地区，地面观测显示这种强烈的秋季最大值，在春季原子氧的深度耗尽。
Observations of the atomic oxygen green line airglow at 557.7 nm began in England with Lord Rayleigh IV in 1923. The large-scale circulation of the atmosphere is now well known, producing a mesopause that is cold in summer and warm in winter. The corresponding transport of atomic oxygen should produce high airglow emission rates in winter, and low values in summer. Thus remotely sensed airglow observations are potentially capable of providing a record of the large-scale circulation of the thermosphere. Here a search is made for the signature of the large-scale circulation using data from the WIND Imaging Interferometer (WINDII) on the Upper Atmosphere Research Satellite, and model results from the TIME-GCM model, making use of earlier ground-based results as well. However, the signature of this circulation is not readily found. In the tropical region a well-defined semi-annual variation of emission rate is identified; this appears to result from the semi-annual variation of the diurnal tide. At mid- and high latitudes a pronounced annual variation is found with an emission rate maximum in the autumn in both hemispheres. At still higher latitudes ground-based observations show this strong autumn maximum, with deep depletion of atomic oxygen in the springtime.