Evidence of Tropospheric 90 Day Oscillations in the Thermosphere
Evidence of Tropospheric 90 Day Oscillations in the Thermosphere
复制标题
热层中对流层 90 天振荡的证据
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
Y. Zhao
中科院分区：
文献类型：
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作者：
F. Gasperini;M. E. Hagan;Y. Zhao
在过去的十年中，有证据表明，陆地天气通过小尺度重力波和全球尺度太阳潮汐传播和耗散效应极大地影响了热层的动力学和平均状态。虽然观测表明，中层上层平均风存在明显的季节内变化，但对卫星高度（1250 -400公里）的这种变化知之甚少。使用跨轨道风测量从小卫星有效载荷和重力场和稳态海洋环流探测器卫星，风从现代回顾分析的研究和应用/热层-电离层-中间层-电动力学一般循环模型模拟，和传出长波辐射数据，我们证明了在热层纬向平均风和具有纬向平均风的日向东传播潮汐中存在显著的全球尺度90天振荡。2009-2010年期间的第3波（DE 3），并提供其与对流层对流活动变化相关的证据。这项研究表明，对流层和热层之间的强耦合发生在季节内的时间尺度。
In the last decade evidence demonstrated that terrestrial weather greatly impacts the dynamics and mean state of the thermosphere via small‐scale gravity waves and global‐scale solar tidal propagation and dissipation effects. While observations have shown significant intraseasonal variability in the upper mesospheric mean winds, relatively little is known about this variability at satellite altitudes (∼250–400 km). Using cross‐track wind measurements from the Challenging Minisatellite Payload and Gravity field and steady‐state Ocean Circulation Explorer satellites, winds from a Modern‐Era Retrospective Analysis for Research and Applications/Thermosphere‐Ionosphere‐Mesosphere‐Electrodynamics General Circulation Model simulation, and outgoing longwave radiation data, we demonstrate the existence of a prominent and global‐scale 90 day oscillation in the thermospheric zonal mean winds and in the diurnal eastward propagating tide with zonal wave number 3 (DE3) during 2009–2010 and present evidence of its connection to variability in tropospheric convective activity. This study suggests that strong coupling between the troposphere and the thermosphere occurs on intraseasonal timescales.
影响因子：
2.6
作者：
Erdal Yiğit;A. Medvedev
通讯作者：
Erdal Yiğit;A. Medvedev