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To quantitatively study the effects of nonlinear interactions on tidestructure, a nonlinear numerical tidal model is developed, and thereliability and convergence of the adopted algorithm and coding are checkedby numerical experiments. Under the same conditions as those employed by theGSWM-00 (Global Scale Wave Model 2000), our model provides the nonlinearquasi-steady solution of the migrating semidiurnal tide, which differs fromthe GSWM-00 result (the linear steady solution) in the MLT region,especially above 100 km. Additionally, their amplitude difference displays aremarkable month-to-month variation, and its significant magnitudes occurduring the month with strong semidiurnal tide. A quantitative analysissuggests that the main cause for the amplitude difference is that theinitial migrating 12-h tide will interact with the mean flow as well as thenonlinearity-excited 6-h tide, and subsequently yield a new 12-h tidalpart. Furthermore, our simulations also show that the mean flow/tidalinteraction will significantly alter the background wind and temperaturefields. The large magnitudes of the tidal amplitude difference and thebackground alteration indicate that the nonlinear processes involved intidal propagations should be comprehensively considered in the descriptionof global atmospheric dynamics in the MLT region. The comparisons among oursimulations, the GSWMs and some observations of tides suggest that thenonlinearity-induced tidal structure variation could be a possible mechanismto account for some discrepancies between the GSWMs and the observations

A numerical study on the impact of nonlinear interactions on the amplitude of the migrating semidiurnal tide