Unusual Quasi 10‐Day Planetary Wave Activity and the Ionospheric Response During the 2019 Southern Hemisphere Sudden Stratospheric Warming
Unusual Quasi 10‐Day Planetary Wave Activity and the Ionospheric Response During the 2019 Southern Hemisphere Sudden Stratospheric Warming
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DOI：
10.1029/2021ja029286
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发表时间：
2021-06
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影响因子：
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通讯作者：
Jack C. Wang;S. Palo;J. Forbes;J. Marino;T. Moffat‐Griffin;N. Mitchell
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作者：
Jack C. Wang;S. Palo;J. Forbes;J. Marino;T. Moffat‐Griffin;N. Mitchell
2019年9月，南半球发生了异常的平流层变暖（SSW）。基于地面和卫星的观测表明，在SSW期间，瞬时向东和向西的准跨质量行星驱动器（q10dws）存在在SSW发作后约10天，波动活动在中层和较低的热层区域中最大化。 Q10DW具有Zonal波数S = 1的Q10DW主要是关于等效器的对称，这与理论形成了鲜明的对比，该理论预测了这种行星波的存在反对称正常模式，并使用微波肢体的声音结合了大气。通过来自南极洲的流星雷达风测量，在此SSW期间，南半球的Q10DW波活性提供了全面的视野。分析表明，各种波数的Q10DW可能是从非线性波浪相互作用中激发的，这些相互作用也涉及s = 1和s = 2的固定行星波。电离层中的准10天振荡（Q10DOS）是现代的，在相对较低的太阳能时期，在中性气氛中Q10DW和地磁活动表明，Q10DW在SSW SSW事件期间在驱动电离层Q10DOS方面起着关键作用。
An unusual sudden stratospheric warming (SSW) event occurred in the Southern Hemisphere in September 2019. Ground‐based and satellite observations show the presence of transient eastward‐ and westward‐propagating quasi‐10 day planetary waves (Q10DWs) during the SSW. The planetary wave activity maximizes in the mesosphere and lower thermosphere region approximately 10 days after the SSW onset. Analysis indicates that the westward‐propagating Q10DW with zonal wave number s = 1 is mainly symmetric about the equator, which is contrary to theory which predicts the presence of an antisymmetric normal mode for such planetary wave. Observations from microwave limb sounder and sounding of the atmosphere using broadband emission radiometry are combined with meteor radar wind measurements from Antarctica, providing a comprehensive view of Q10DW wave activity in the Southern Hemisphere during this SSW. Analysis suggests that the Q10DWs of various wavenumbers are potentially excited from nonlinear wave‐wave interactions that also involve stationary planetary waves with s = 1 and s = 2. The Q10DWs are also found to couple the ionosphere with the neutral atmosphere. The timing of the quasi‐10‐day oscillations (Q10DOs) in the ionosphere are contemporaneous with the Q10DWs in the neutral atmosphere during a period of relatively low solar and geomagnetic activity, suggesting that the Q10DWs play a key role in driving the ionospheric Q10DOs during the Southern SSW event. This study provides observational evidence for coupling between the neutral atmosphere and ionosphere through the upward propagation of global scale planetary waves.