Dynamics of Zonally Averaged Circulation Characteristics in the Middle Atmosphere

The ERA-Interim archive data and circulation calculations using a middle and upper atmosphere model (MUAM) have been used to study dynamic processes in the middle atmosphere. Variations in zonally averaged atmospheric characteristics have been analyzed based on observational data and model calculations. In the middle atmosphere within a range of 10–30 days, synchronous temperature variations are observed within zones extended horizontally and vertically. Horizontally, the sign of such variations changes in the region of jet streams (and remains unchanged at the equator) and, vertically, their sign changes within the stratopause and mesopause regions. The nature of these variations is almost independent of the phase of the quasi-biennial cycle in the equatorial stratosphere. These variations are global in nature and similar to oscillations in meridional circulation cells.