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首页> 外文期刊>Annales Geophysicae >On the evaluation of the phase relation between temperature and wind tides based on ground-based measurements and reanalysis data in the middle atmosphere
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On the evaluation of the phase relation between temperature and wind tides based on ground-based measurements and reanalysis data in the middle atmosphere

机译：基于地基测量和中部大气中的再分析数据的温度和风潮之间的相关系评价

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The?variability in the middle atmosphere is driven by a variety of waves covering different spatial and temporal scales. We diagnose the variability in the thermal tides due to changes in the background wind by an adaptive spectral filter, which takes the intermittency of tides into account. We apply this diagnostic to temperature observations from daylight-capable lidar at midlatitudes (54° N, 12° E) as well as to reanalysis data of horizontal winds from Modern-Era Retrospective analysis for Research and Applications, Version?2 (MERRA-2). These reanalysis data provide additional wind information in the altitude range between 30 and 70 km at the location of the lidar as well as on a global scale. Using the global data gives information on the tidal modes seen at one location. A comparison of the temperature and wind information affirms whether there is a fixed phase relation of the tidal waves in the temperature and the wind data. We found that in general the local tidal signatures are dominated by migrating tidal modes, and the signature is weaker in temperatures than in winds. While the meridional wind tide leads the zonal wind tide by 90°, the phase relation between the temperature and the wind tide is more complex. At certain altitudes the temperature tide follows the zonal wind tide. This knowledge helps in improving the interpretation of the seasonal variation in tides from different observables, especially when only data from single locations are used. The findings provide additional information about the phase stability of tidal waves, and the results clearly show the importance of a measurement acquisition on a routine basis with high temporal and spatial resolution.
机译：中间大气中的变异性是由覆盖不同空间和时间尺度的各种波驱动。我们通过自适应光谱滤波器诊断由于背景风的变化而导致的热潮汐的可变性，这将潮汐间隔考虑到潮汐。我们将这种诊断应用于中阵容（54°N，12°E）的夏令时的温度观察，以及从现代时代回顾性的研究和应用程序的水平风的再分析数据，版本？2（Merra-2 ）。这些重新分析数据在LIDAR位置的海拔高度范围内提供额外的风信息以及全球范围内的位置。使用全局数据提供有关在一个位置看到的潮汐模式的信息。温度和风信息的比较确认是否存在潮汐波在温度和风数据中的固定相位关系。我们发现，一般来说，本地潮汐签名通过迁移潮汐模式来支配，而且签名在温度下比风较弱。虽然化学风潮导致区域风潮90°，但温度与风潮之间的相位关系更复杂。在某些海拔高度，温度潮汐沿着区域风潮。这种知识有助于改善来自不同观察到的潮汐季节变化的解释，特别是当使用单个位置的数据时。该研究结果提供了有关潮汐波的相位稳定性的额外信息，结果清楚地表明了在常规基础上具有高时和空间分辨率的测量采集的重要性。

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