Lidar observation of gravity and tidal waves in the stratosphere and mesosphere
Lidar observation of gravity and tidal waves in the stratosphere and mesosphere
复制标题
平流层和中间层重力和潮汐波的激光雷达观测
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
Alain Hauchecorne
中科院分区：
文献类型：
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作者：
M. Chanin;Alain Hauchecorne
在过去两年中，在普罗旺斯上海站(北纬44°，经度6°)用激光雷达测量了30-80公里高度范围内的大气密度和温度。给出了该技术在研究中层大气结构方面的潜力，并讨论了波传播的初步结果。结果表明，在该高度范围内可以系统地观察到波状结构。傅立叶分析表明，大部分能量是由8到15公里量级的垂直波长的波传输的。密度变化的幅度在70公里内服从ρ−-L/2定律。观测到的密度波的特征表明，它们是由对流层向上传播的内重力波和30-50公里范围内的日潮分量叠加而成的。这样的波动能够引起大气密度的相当大的扰动，因此每小时的温度也会引起相当大的扰动。激光雷达技术首次能够从连续运行的地面站监测到这些变化。
Lidar measurements of atmospheric density and temperature in the altitude range 30-to 80 km have been performed during the last 2 years from the Observatory of Haute-Provence (latitude 44°N, longitude, 6°E). The potential of this technique for studying the middle atmospheric structure is presented and preliminary results on wave propagation are discussed. It is shown that wave-like structures are observed systematically in this height range. Fourier analysis indicates that most of the energy is transported by waves of vertical wavelengths on the order of 8 to 15 km. The amplitude of the density variations is shown to follow a ρ−l/2 law up to 70 km. The characteristics of the observed density waves suggest that they are caused by a superposition of internal gravity waves propagating upward from the troposphere and a diurnal tide component in the range 30–50 km. Such waves are able to induce quite significant perturbations in atmospheric density and therefore temperature on an hourly basis. The Lidar technique is able to monitor those variations for the first time from a ground station operating continuously.