Resonant transient atmospheric waves—A possible mechanism of connection between lower atmosphere, stratosphere and mesosphere

Abstract

2-D model runs based on numerical quasigeostrophic transient wave's model has revealed the possibility of the middle atmosphere (MA) resonant excitation as a whole for special(resonant) periods of a periodical external forcing. The reaction of the MA looks like large-scale transient waves (Rossby waves) and depends on a zonal-mean wind structure,zonal wavenumber and the structure of source. Such transient waves excited at lower boundary penetrate to mesospheric levels. The periodogram analysis of temperature lidar data for Haute Provance has shown the characteristic dominant periods (5–7, and 9–12 days) between 30–80 km for winter 1993, and with vertical structure similar to numerical simulation results.