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A numerical study on amplitude characteristics of the terdiurnal tide excited by nonlinear interaction between the diurnal and semidiurnal tides

机译：日潮和半日潮之间非线性相互作用激发的二日潮振幅特征的数值研究

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A fully nonlinear numerical tidal model has been developed with the aim of presenting amplitude features of the terdiurnal tide excited by nonlinear interaction between the diurnal and semidiurnal tides. Since the superposition of the migrating diurnal and semidiurnal tidal solutions from the GSWM-00 (Global Scale Wave Model 2000) is taken as the initial disturbance for this nonlinear model, the diurnal and semidiurnal tides are allowed to nonlinearly interact with each other. The analyses on the simulations show that the migrating terdiurnal tide can be significantly excited by the nonlinear interaction between the diurnal and semidiurnal tides in the mesosphere and lower thermosphere (MLT) region, especially above 90 km, and have pronounced amplitudes (wind speeds over 15 m s-1 and temperature over 10 K) in the lower thermosphere (90-110 km). In addition, its amplitudes vary strongly with season and maximize during equinoctial months at low and middle latitudes, and its zonal wind component is larger than the meridional wind component. Simultaneously, the diurnal and semidiurnal tides exhibit evident variations, indicating that the wave-wave and wave-mean flow interactions are the important cause of the tidal variability. Our calculations also illustrate the remarkable alteration of the background fields induced by the mean flow/tidal interaction, implying this interaction should be comprehensively considered in describing global atmospheric dynamic and thermal structures in the MLT region.
机译：已经开发了一个完全非线性的数值潮汐模型，其目的是呈现由日潮和半日潮之间的非线性相互作用激发的地潮的振幅特征。由于来自GSWM-00（全球尺度波动模型2000）的日变化潮汐和半日潮汐解的叠加被认为是该非线性模型的初始扰动，因此，日潮和半日潮汐之间可以进行非线性相互作用。模拟分析表明，中层和下热层（MLT）区域（尤其是90 km以上）的日潮和半日潮之间的非线性相互作用可以极大地激发迁徙的潮汐潮，并且振幅明显（风速超过15较低的热层（90-110 km）中的ms -1 和温度超过10 K）。此外，其振幅随季节变化很大，在中低纬度的等月月份最大。其纬向风分量大于子午风分量。同时，日潮和半日潮表现出明显的变化，表明波-波和波均流相互作用是潮汐变化的重要原因。我们的计算还说明了由平均流量/潮汐相互作用引起的背景场的显着变化，这意味着在描述MLT地区的全球大气动力和热结构时应综合考虑这种相互作用。

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