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On the detection and attribution of gravity waves generated by the 20 March 2015 solar eclipse

机译:关于2015年3月20日日食产生的重力波的探测和归因

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摘要

Internal gravity waves are generated as adjustment radiation whenever a sudden change in forcing causes the atmosphere to depart from its large-scale balanced state. Such a forcing anomaly occurs during a solar eclipse, when the Moon’s shadow cools part of the Earth’s surface. The resulting atmospheric gravity waves are associated with pressure and temperature perturbations, which in principle are detectable both at the surface and aloft. In this study, surface pressure and temperature data from two UK sites at Reading and Lerwick are examined for eclipse-driven gravity wave perturbations during the 20 March 2015 solar eclipse over northwest Europe. Radiosonde wind data from the same two sites are also analysed using a moving parcel analysis method, to determine the periodicities of the waves aloft. On this occasion, the perturbations both at the surface and aloft are found not to be confidently attributable to eclipse-driven gravity waves. We conclude that the complex synoptic weather conditions over the UK at the time of this particular eclipse helped to mask any eclipse-driven gravity waves.This article is part of the themed issue ‘Atmospheric effects of solar eclipses stimulated by the 2015 UK eclipse’.
机译:每当强迫的突然变化导致大气偏离其大规模平衡状态时,就会产生内部重力波作为调节辐射。当日食发生在月食阴影使地球表面的一部分冷却时,就会发生这种强迫异常。产生的大气重力波与压力和温度扰动有关,原则上在地面和高空都可以检测到。在这项研究中,研究了来自英国雷丁和勒威克两个站点的表面压力和温度数据,以研究在2015年3月20日西北欧发生的日食引起的重力波扰动。还使用移动包裹分析方法分析了来自相同两个地点的探空仪风数据,以确定高空波的周期性。在这种情况下,发现地表和高空的扰动都不能确定地归因于日蚀驱动的重力波。我们得出的结论是,在这种特殊月食时英国的复杂天气状况有助于掩盖任何由日食驱动的重力波。本文是“ 2015年英国日食刺激的日食对大气的影响”这一主题的一部分。

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