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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Tidal Variations in the Mesosphere and Lower Thermosphere Before, During, and After the 2009 Sudden Stratospheric Warming
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Tidal Variations in the Mesosphere and Lower Thermosphere Before, During, and After the 2009 Sudden Stratospheric Warming

机译：潮汐中间层和较低的变化2009年热大气层之前、期间和之后突然的变暖

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摘要

This work presents a comprehensive evaluation of tides in the mesosphere and lower thermosphere (MLT) of the Whole Atmosphere Community Climate Model with thermosphereionosphere eXtension (WACCMX) and data assimilation provided by the Data Assimilation Research Testbed (DART) ensemble Kalman filter. A total of 26 diurnal and semidiurnal tidal components are calculated using the latest hourly data assimilation cycling during January 12–March 15, 2009 time period. When averaged over this entire yaw cycle, most tidal components display a latitudinal and vertical structures similar to that observed by the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER). However, WACCMX + DART amplitudes of some diurnal tidal components are a factor of ~1.2–2 times smaller and the peak altitudes and latitudes are shifted compared to SABER. The amplitudes of semidiurnal tides are likewise underestimated in the model, as well as being shifted in altitude and latitude, and some wavenumbers are not captured. Daily tidal variations are calculated in the model and compared with SABER and Super Dual Auroral Radar Network (SuperDARN) radar observations. Both the model and the radars show an amplification of the migrating semidiurnal tide during the week following the peak SSW. Enhancements in nonmigrating diurnal tides are also shown around the SSW peak, which could be produced by the nonlinear interaction between migrating tides and planetary waves. This study finds that, despite using data assimilation to constrain model dynamics, more work is needed in order to accurately simulate the full tidal spectrum and responses to SSWs in the MLT region.
机译：这项工作提出了一个综合评价潮汐在中间层和降低热大气层(MLT)整个氛围的社区环境模型与thermosphereionosphere扩展(WACCMX)和提供的数据同化数据同化研究试验台(DART)集合卡尔曼滤波。半日潮汐组件计算使用最新的每小时的数据同化循环在2009年3月12日1月15日。当平均在这整个偏航周期,最大显示一个纬度和潮汐组件垂直结构与所观察到的相似大气的探测使用宽带发射辐射测量(剑)。飞镖振幅的全日潮组件小~ 1.2倍2倍和峰值海拔和纬度相比转向军刀。同样被低估的模型,以及在海拔和纬度转变,一些波数不捕获。计算模型和变化相比之下,军刀和超级双极光雷达网络(SuperDARN)雷达观测。模型和雷达显示的放大在这个星期的迁移半日潮量峰值。nonmigrating周日潮汐也参观量峰值,可能产生的非线性迁移潮汐和之间的相互作用行星波。利用数据同化约束模型动态,需要更多的工作来准确地模拟完整的潮汐谱和反应量在MLT地区。

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