Simulated variability of the high‐latitude thermosphere induced by small‐scale gravity waves during a sudden stratospheric warming
Simulated variability of the high‐latitude thermosphere induced by small‐scale gravity waves during a sudden stratospheric warming
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平流层突然变暖期间小尺度重力波引起的高纬度热层的模拟变化
DOI：
10.1002/2013ja019283
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T. Immel
中科院分区：
文献类型：
--
作者：
Erdal Yiğit;A. Medvedev;S. England;T. Immel
我们首次研究了源自低层大气的小尺度重力波（GWs）在平流层突然变暖（SSW）期间对高纬热层变率的影响。我们使用了一个综合了Yiğit等人（2008）的光谱GW参数化的大气环流模型。在变暖期间，高纬度热层的GW穿透和由此产生的动量沉积速率增加了3-6倍。在~250 km处，GW动力效应的相关时间变率增加了~10倍，表现出复杂的地理变化。局地GW阻力时间变异性的峰值幅度超过平均GW阻力2倍以上。与热层GW效应不存在的情况相比，允许GW传播到热层时，小尺度热层风变率更大。这些结果表明，在ssw期间，GW引起的变化是高纬度热层变率的一个重要来源。
We present the results of the first investigation of the influence of small‐scale gravity waves (GWs) originating in the lower atmosphere on the variability of the high‐latitude thermosphere during a sudden stratospheric warming (SSW). We use a general circulation model that incorporates the spectral GW parameterization of Yiğit et al. (2008). During the warming, the GW penetration into the thermosphere and resulting momentum deposition rates increase by up to a factor of 3–6 in the high‐latitude thermosphere. The associated temporal variability of GW dynamical effects at ~250 km are enhanced by up to a factor of ~10, exhibiting complex geographical variations. The peak magnitude of the GW drag temporal variability locally exceeds the mean GW drag by more than a factor of 2. The small‐scale thermospheric wind variability is larger when GW propagation into the thermosphere is allowed compared to the case when thermospheric GW effects are absent. These results suggest that GW‐induced variations during SSWs constitute a significant source of high‐latitude thermospheric variability.
影响因子：
5.2
作者：
A. Medvedev;Erdal Yiğit
通讯作者：
A. Medvedev;Erdal Yiğit
影响因子：
5.2
作者：
E. Yiğit;A. S. Medvedev
通讯作者：
A. S. Medvedev