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arXiv 2202.00359physics.ao-ph
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地球大气自转对声-重力波频谱的影响

Influence of the Earth's atmosphere rotation on the spectrum of acoustic-gravity waves

O. K. Cheremnykh, S. O. Cheremnykh, D. I. Vlasov

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10 pages, 2 figures
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摘要：

Cheremnykh等人最近的一篇论文（《空间研究进展》，2022年）表明，考虑到地球大气的旋转，导致在声学诊断图上出现了一个新的具有连续频谱的消逝波区域--重力波。该区域位于重力波的下限以下，在所有波长下都等于$2Ω$，其中$Ω$是大气旋转的角频率。这一结果是在大气的高纬度地区得到的，在那里我们可以限制自己只考虑地球自转频率的垂直分量。在拟议的文件中，我们表明，考虑到这两个组件的矢量的大气旋转频率$\overrightarrowΩ$ -水平，$Ω\cosφ$，和垂直，$Ω\sinφ$，其中$φ$是地球的纬度，在声-重力波传播中起主导作用的垂直分量。结果表明，水平分量对声波和重力波区域边界诊断图的影响不大，可以忽略不计。还表明，最强的垂直分量的频率影响的下限的重力波，这取决于在所有波长上的纬度的观测站点，等于$2Ω\sinφ$。

英文摘要：

It was shown in a recent paper by Cheremnykh et al. (Advances in Space Research, 2022) that taking into account the rotation of the Earth's atmosphere leads to the appearance of a new region of evanescent waves with a continuous frequency spectrum on the diagnostic diagram of acoustic-gravity waves. The region is located below the lower limit of gravity waves, which is equal $2Ω$ at all wavelengths, where $Ω$ is the angular frequency of the atmosphere rotation. This result was obtained for high-latitude regions of the atmosphere, in which we can limit ourselves to considering only the vertical component of the Earth's rotation frequency. In the proposed paper we show that taking into account both components of the vector of the atmosphere rotation frequency $\overrightarrowΩ$ - horizontal, $Ω\cosφ$ , and vertical, $Ω\sinφ$, where $φ$ is the Earth`s latitude, the dominant role in the acoustic-gravity waves propagation is played by the vertical component. It is shown that the horizontal component leads to an insignificant modification on the diagnostic diagram of the boundaries of the areas of acoustic and gravity waves, which can be neglected. Also shown that the strongest vertical component of the frequency affects the lower limit of gravity waves, which depends at all wavelengths on the latitude of the observation site and is equal to $2Ω\sinφ$.

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