HEIGHT STRUCTURE OF PREVAILING WINDS AND WAVE ACTIVITY IN MIDDLE ATMOSPHERE

The atmosphere of the Earth is a complicated dynamic system in which a broad spatio-temporal spectrum of motions is observed. The investigation of the altitude variability of zonal and meridional circulation in the interval of heights of the tropo-stratosphere and upper mesosphere - lower thermosphere was carried out. It is well known that the noticeable time variability of thermodynamic parameters due to internal gravity waves, tides and planetary waves is typical. Vertically propagating in the atmosphere and interacting with zonal movements the waves of these scales takes a part in generation of circulation in the height interval of middle atmosphere. In this paper the atmospheric planetary waves intensity (with scales 2-30 days) as well as intensity of tides and internal gravity waves (IGW)(with scales 1-24 hours) in the interval of heights 0- 55 km and 80-110 km for the region of Kazan (56N,49E) were investigated. The character of inter-annual variations of planetary wave intensity changes in dependence on height and is determined by the source of wave perturbation, by the conditions of propagation in the atmosphere and by the wave interactions. We estimate planetary wave intensity having the temporal scales 2-30 days on basis of mean- square deviation σ from 30-day mean value of wind velocity: () ∑ = 〉 〈 − = N i i x x N 1 2 1 σ