The study of wave motions in the atmosphere, in particular, atmospheric solar tides is considered in this research. Using the middle and upper atmosphere model (MUAM) data, the latitudinal-high cross-sections of the amplitude and phase of individual tidal components, as well as their temporal variability, were shown. The most suitable periods for the complex Morlet wavelet transform of data were specified for the further use. The results obtained were used to study nonlinear interactions both between atmospheric tides and the mean flow and with each other.
We studied the temperature and the emission of 557.7 nm in the MLT in the geophysical observatory “Tory” (51.8N, 103.1E) during winter 2018-2019. For analysis, we used the measurement data of the Fabry-Perot interferometer (FPI), the SABER/TIMED data, the data of the model of middle and upper atmosphere (MUAM) and the data of the ERAinterim archive. It turned out that MLT emission is decreases during an increase in the amplitude of a stationary planetary wave with a zonal wave number 1 in the stratosphere, as well as during sudden stratospheric warmings. However, the temperature according to the FPI data increases, and according to the SABER data temperature decreases during these events in the stratosphere. In this paper we discuss the reasons for these differences, which are caused by a variation in the height of the emission layer and by the features of the SABER observations. The MUAM data confirm our assumptions about the reasons for the differences between SABER and FPI temperature.
A parameterization of the dynamical and thermal effects of orographic gravity waves (OGWs) and assimilation quasibiennial oscillations (QBOs) of the zonal wind in the equatorial lower atmosphere are implemented into the numerical model of the general circulation of the middle and upper atmosphere MUAM. The sensitivity of vertical ozone fluxes to the effects of stationary OGWs at different QBO phases at altitudes up to 100 km for January is investigated. The simulated changes in vertical velocities produce respective changes in vertical ozone fluxes caused by the effects of the OGW parameterization and the transition from the easterly to the westerly QBO phase. These changes can reach 40 - 60% in the Northern Hemisphere at altitudes of the middle atmosphere.
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