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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Horizontal and vertical propagation and dissipation of gravity waves in the thermosphere from lower atmospheric and thermospheric sources
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Horizontal and vertical propagation and dissipation of gravity waves in the thermosphere from lower atmospheric and thermospheric sources

机译：水平和垂直传播重力波的耗散热大气层降低大气和thermospheric来源

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摘要

The dissipation of high-frequency gravity waves (GWs) in the thermosphere is primarily due to kinematic viscosity and thermal diffusivity. Recently, an anelastic GW dispersion relation was derived which includes the damping effects of kinematic viscosity and thermal diffusivity in the thermosphere and which is valid before and during dissipation. Using a ray trace model which incorporates this new dispersion relation, we explore many GW properties that result from this dispersion relation for a wide range of thermospheric temperatures. We calculate the dissipation altitudes, horizontal distances traveled, times taken, and maximum vertical wavelengths prior to dissipation in the thermosphere for a wide range of upward-propagating GWs that originate in the lower atmosphere and at several altitudes in the thermosphere. We show that the vertical wavelengths of dissipating GWs, λ z (z diss), increases exponentially with altitude, although with a smaller slope for z > 200 km. We also show how the horizontal wavelength, λ H, and wave period spectra change with altitude for dissipating GWs. We find that a new dissipation condition can predict our results for λ z (z diss) very well up to altitudes of ～500 km. We also find that a GW spectrum excited from convection shifts to increasingly larger λ z and λ H with altitude in the thermosphere that are not characteristic of the initial convective scales. Additionally, a lower thermospheric shear shifts this spectrum to even larger λ z , consistent with observations. Finally, we show that our results agree well with observations.
机译：高频引力波的耗散(千瓦)热电离层是主要原因运动粘度和热扩散率。最近,一个滞弹的GW色散关系推导出包括阻尼的影响运动粘度和热扩散率和之前热电离层,哪些是有效的在耗散。包含了这个新的色散关系,我们探索许多GW属性,从这个结果为广泛的色散关系thermospheric温度。耗散高度、水平距离旅行,乘,和最大垂直的波长耗散在前为广泛的热大气层upward-propagating千瓦制成低层大气和几个高度热大气层。波长的消散取而代之,λz (z迪斯),与高度成指数增加,尽管小坡的z > 200公里。水平如何波长λH波期光谱变化与高度驱散千瓦。条件可以预测我们的结果为λz (z迪斯)很好~ 500公里的高度。还发现一个千瓦频谱兴奋对流转移到越来越大的λz和λ与高度H运转不是最初的对流的特征鳞片。这个频谱转移到更大的λz,与观测一致。我们的结果与观测一致。

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