Ionospheric Variability during the 2020–2021 SSW: COSMIC-2 Observations and WACCM-X Simulations
Ionospheric Variability during the 2020–2021 SSW: COSMIC-2 Observations and WACCM-X Simulations
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DOI：
10.3390/atmos13030368
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发表时间：
2022-02
期刊：
影响因子：
2.9
通讯作者：
N. Pedatella
中科院分区：
文献类型：
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作者：
N. Pedatella
利用气象、电离层和气候2号星座观测系统（COSMIC-2）的观测数据和全大气层电离层扩展气候模式（WACCM-X）的模拟结果，研究了2020-2021年平流层突然变暖（SSW）期间电离层的变化。COSMIC-2对低纬度电离层进行了前所未有的时空采样，能够研究SSW事件期间电离层的短期（<5天）变化。COSMIC-2的观测结果表明，在周日和纬向平均电离层总电子含量（ITEC）的减少和减少的振幅的日变化在电离层在SSW。还观测到了半日太阳和月球迁移潮以及纬向波数为3的向西传半日潮的ITEC振幅增强。WACCM-X模拟表明，这些变化是由2020-2021年SSW事件期间平流层-中间层的变化驱动的。结果显示了2020-2021年SSW对电离层平均状态、日变化和半日变化的影响，以及COSMIC-2使命观测电离层短期变化的能力，电离层短期变化是由低层大气中的气象变化驱动的。
Variability in the ionosphere during the 2020–2021 sudden stratospheric warming (SSW) is investigated using a combination of Constellation Observing System for Meteorology, Ionosphere, and Climate-2 (COSMIC-2) observations and the Whole Atmosphere Community Climate Model with thermosphere–ionosphere eXtension (WACCM-X) simulations. The unprecedented spatial–temporal sampling of the low latitude ionosphere afforded by COSMIC-2 enables investigating the short-term (<5 days) variability in the ionosphere during the SSW event. The COSMIC-2 observations reveal a reduction in the diurnal and zonal mean ionosphere total electron content (ITEC) and reduced amplitude of the diurnal variation in the ionosphere during the SSW. Enhanced ITEC amplitudes of the semidiurnal solar and lunar migrating tides and the westward propagating semidiurnal tide with zonal wavenumber 3 are also observed. The WACCM-X simulations demonstrate that these variations are driven by variability in the stratosphere–mesosphere during the 2020–2021 SSW event. The results show the impact of the 2020–2021 SSW on the mean state, diurnal, and semidiurnal variations in the ionosphere, as well as the capabilities of the COSMIC-2 mission to observe short-term variability in the ionosphere that is driven by meteorological variability in the lower atmosphere.