Response of migrating tides to the stratospheric sudden warming in 2009 and their effects on the ionosphere studied by a whole atmosphere-ionosphere model GAIA with COSMIC and TIMED/SABER observations
Response of migrating tides to the stratospheric sudden warming in 2009 and their effects on the ionosphere studied by a whole atmosphere-ionosphere model GAIA with COSMIC and TIMED/SABER observations
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DOI：
10.1029/2012ja017650
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发表时间：
2012-10-24
影响因子：
2.8
通讯作者：
Shinagawa, H.
中科院分区：
文献类型：
--
作者：
Jin, H.;Miyoshi, Y.;Shinagawa, H.
本文将整个大气-电离层耦合模型 GAIA 的结果与 2008/2009 年北方冬季的 COSMIC 和 TIMED/SABER 观测结果进行了比较。 GAIA 模型通过微移方法吸收了气象再分析数据。比较结果表明，从平流层到电离层的主要特征，包括2009年主要平流层突然变暖（SSW）事件的增长和衰变，都基本一致。在此期间，模型和COSMIC观测再现了与先前观测结果类似的F区电子密度及其局时相移的明显半日变化。该模型表明，电子密度变化是由 E x B 漂移的半日变化增强引起的，这可能与低层热层中半日迁移潮（SW2）的放大有关。模型和TIMED/SABER观测表明，SW2潮汐在低纬度从平流层到热层以及相位变化都会放大。低纬度平流层中 SW2 变化的可能机制可能是由于纬向背景风和经向温度梯度的变化而导致其传播条件的变化，特别是 (2, 2) 模式，和/或由于平流层臭氧的重新分布而导致其来源的增强。目前的结果还表明，电离层和大气中的昼夜迁移成分（TW3）存在显着的长期变化。
This paper compares results from a whole atmosphere-ionosphere coupled model, GAIA, with the COSMIC and TIMED/SABER observations during the 2008/2009 northern winter season. The GAIA model has assimilated meteorological reanalysis data by a nudging method. The comparison shows general agreement in the major features from the stratosphere to the ionosphere including the growth and decay of the major stratospheric sudden warming (SSW) event in 2009. During this period, a pronounced semidiurnal variation in the F region electron density and its local-time phase shift similar to the previous observations are reproduced by the model and COSMIC observation. The model suggests that the electron density variation is caused by an enhanced semidiurnal variation in the E x B drift, which is probably related to an amplified semidiurnal migrating tide (SW2) in the lower thermosphere. The model and TIMED/SABER observation show that the SW2 tide amplifies at low latitudes from the stratosphere to the thermosphere as well as the phase variation. Possible mechanisms for the SW2 variability in the low latitude stratosphere could be the change of its propagation condition, especially the (2, 2) mode, due to changing zonal background wind and meridional temperature gradient, and/or an enhancement of its source due to redistribution of stratospheric ozone. Present results also show a prominent long-term variation of the terdiurnal migrating component (TW3) in the ionosphere and atmosphere.