An estimate of strong local body forcing and gravity wave radiation based on OH airglow and meteor radar observations
An estimate of strong local body forcing and gravity wave radiation based on OH airglow and meteor radar observations
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DOI：
10.1029/2001gl013753
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发表时间：
2002-05
影响因子：
5.2
通讯作者：
D. Fritts;S. Vadas;Yoshinori Yamada
中科院分区：
文献类型：
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作者：
D. Fritts;S. Vadas;Yoshinori Yamada
重力波和小尺度流动特征的气辉测量与其他大尺度风的测量一起使用，提供了量化中层顶高度重力波动力学的独特能力。我们在这里考虑使用日本 MU 天文台的 OH 气辉成像仪和流星雷达观测到的事件。这是一次振幅和动量通量异常大的波浪破碎事件。我们的假设是，此类事件相对常见，并且由此产生的平均流的局部强迫代表了二次重力波的有力来源，可以很好地渗透到热层中。我们的分析表明，重力波动量通量为 ∼900 m2s−2，远大于其他技术估计的值，不到一小时的平均流速为 ∼80 ms−1。我们还估计了由局部物体强迫产生的次级波的规模和频率。
Airglow measurements of gravity wave and smaller‐scale flow features, used together with other measurements of larger‐scale winds, provide a unique ability to quantify gravity wave dynamics at mesopause altitudes. We consider here an event observed with an OH airglow imager and the meteor radar at the MU Observatory in Japan. This was a wave breaking event of unusually large amplitude and momentum flux. Our hypothesis is that such events are relatively common, and that the resulting local forcing of the mean flow represents a vigorous source of secondary gravity waves that penetrate well into the thermosphere. Our analysis suggests a gravity wave momentum flux of ∼900 m2s−2, far larger than estimated by other techniques, and a mean flow acceleration of ∼80 ms−1 in less than an hour. We also estimate the scales and frequencies of the secondary waves resulting from this local body forcing.