Acoustic-gravity waves in the atmosphere generated by infragravity waves in the ocean
Acoustic-gravity waves in the atmosphere generated by infragravity waves in the ocean
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DOI：
10.1186/s40623-015-0212-4
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发表时间：
2015-04-02
影响因子：
3
通讯作者：
Bullett, Terence W.
中科院分区：
文献类型：
--
作者：
Godin, Oleg A.;Zabotin, Nikolay A.;Bullett, Terence W.
海洋重力波是海洋中的表面重力波，其周期长于约30 s。超重力波传播越洋距离，并且由于其长波长，提供了在海洋、大气和固体地球中耦合波过程的机制。在这里，我们提出了一个严格的物理理由的假设，背景海浪可能会产生波在高层大气中。我们发现，在低于一定的过渡频率约3兆赫的频率，亚重力波不断辐射到高层大气中的声重力波的形式的能量。基于电离层观测和深海机械能和动量通量的估计，我们得出结论，海洋起源的声重力波可能对高层大气产生可观测的影响。我们预计我们的工作将成为详细分析海洋产生的背景声重力波的全球表现形式的起点。
Infragravity waves are surface gravity waves in the ocean with periods longer than approximately 30 s. Infragravity waves propagate transoceanic distances and, because of their long wavelengths, provide a mechanism for coupling wave processes in the ocean, atmosphere, and the solid Earth. Here, we present a strict physical justification for the hypothesis that background ocean waves may generate waves in the upper atmosphere. We show that, at frequencies below a certain transition frequency of about 3 mHz, infragravity waves continuously radiate their energy into the upper atmosphere in the form of acoustic-gravity waves. Based on ionospheric observations and estimates of the fluxes of the mechanical energy and momentum from the deep ocean, we conclude that acoustic-gravity waves of oceanic origin may have an observable impact on the upper atmosphere. We anticipate our work to be a starting point for a detailed analysis of global manifestations of the ocean-generated background acoustic-gravity waves.