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重力波是中间层大气的重要能量来源,气辉观测为研究中间层重力波特性提供了极好的方法。本文利用最新的 OH 气辉激发机制,建立了一个较完整的光化、动力模式来分析重力波传播对 OH 气辉的影响。结果表明,化学反应速率系数不定性对 Krassovsky 比振幅的影响较小,但淬灭过程的影响必须考虑。Krassovsky 比的振幅和相位均依赖于波周期,其振幅在2.1和10.3之间变化;这表明 OH 气辉亮度的相对变化大于温度的相对变化。一般情况下,重力波引起的温度扰动超前于气辉亮度的变化。与实测资料比较发现,两者变化趋势基本一致,在短周期波时吻合较好。
Gravity wave is an important energy source of the middle layer atmosphere, and the airspeak observation provides an excellent method for studying the gravity wave characteristics of the middle layer. In this paper, a new photochemical and kinetic model has been established to analyze the influence of gravity wave propagation on the OH gas radiance using the latest OH gas-lift excitation mechanism. The results show that the uncertainty of chemical reaction rate coefficient has less influence on the Krassovsky than the amplitude, but the influence of quenching process must be considered. The amplitude and phase of the Krassovsky ratio all depend on the wave period, and the amplitude of the Krassovsky ratio varies between 2.1 and 10.3; this indicates that the relative change in brightness of the OH gas is greater than the relative change in temperature. Under normal circumstances, the temperature fluctuations caused by gravity waves ahead of the changes in the brightness of the gas. Compared with the measured data, the trend of the two is basically the same, which is in good agreement with the short-period wave.