Unexpected connections between the stratosphere and ionosphere
Unexpected connections between the stratosphere and ionosphere
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DOI：
10.1029/2010gl043125
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发表时间：
2010-05
影响因子：
5.2
通讯作者：
L. Goncharenko;Jorge L. Chau;Han L. Liu;A. Coster
中科院分区：
文献类型：
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作者：
L. Goncharenko;Jorge L. Chau;Han L. Liu;A. Coster
电离层与下方过程的耦合仍然是一个难以捉摸的难题，因为上方快速变化的外部驱动因素掩盖了与低层大气源有关的变化。在这里，我们使用叠加的独特情况，当前的深太阳极小期和破纪录的平流层变暖事件，以获得新的见解电离层扰动的原因。我们发现，在高纬度冬季平流层（1030公里）突然变暖事件发生后几天，低纬度电离层（200-1000公里）出现了大（50-150%）的持续变化。我们排除了太阳辐照度和地磁活动作为观测到的变化的解释。使用大气环流模型，我们解释这些观测在大气潮汐的大的变化，从他们的非线性相互作用与行星波，加强在突然变暖。我们预计，进一步了解与行星波的耦合过程，在平流层突然变暖事件期间加剧，有可能提前几天预报低纬电离层天气。
The coupling of the ionosphere to processes from below remains an elusive and difficult problem, as rapidly changing external drivers from above mask variations related to lower atmospheric sources. Here we use superposition of unique circumstances, current deep solar minimum and a record‐breaking stratospheric warming event, to gain new insights into causes of ionospheric perturbations. We show large (50–150%) persistent variations in the low‐latitude ionosphere (200–1000 km) that occur several days after a sudden warming event in the high‐latitude winter stratosphere (∼30 km). We rule out solar irradiance and geomagnetic activity as explanations of the observed variation. Using a general circulation model, we interpret these observations in terms of large changes in atmospheric tides from their nonlinear interaction with planetary waves that are strengthened during sudden warmings. We anticipate that further understanding of the coupling processes with planetary waves, accentuated during the stratospheric sudden warming events, has the potential of enabling the forecast of low‐latitude ionospheric weather up to several days in advance.