Coupling processes between atmospheric vortical perturbations and acoustic-gravity waves in the mesosphere-thermosphere regions

Details Coupling processes between atmospheric vortical perturbations and acoustic-gravity waves in the mesosphere-thermosphere regions Coupling processes between atmospheric vortical perturbations and acoustic-gravity waves in the mesosphere-thermosphere regions

Apr 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004jastp..66..715d&link_type=abstract

Journal of Atmospheric and Solar-Terrestrial Physics, Volume 66, Issue 6-9, p. 715-732.

Physics

5

Acoustic-Gravity Waves, Molecular Viscosity, Horizontal Shear Flow

Scientific paper

The importance of the horizontal wind with horizontal shear for the formation of short-period acoustic-gravity waves (AGWs), as well as for their mutual coupling processes in the mesosphere-thermosphere regions, is considered. The linear equation describing the coupling and temporal development between these waves in the horizontal wind with constant horizontal shear (horizontal shear flow) is obtained for the isothermal atmosphere. The presence of vortical perturbations (shear waves) and short-period AGWs as well as their mutual coupling in the horizontal shear flow are considered by analytic and numerical solutions of this equation. The acoustic-gravity wave frequency obtained depends on the analogue of the Richardson number Rh for horizontal shear flow. For the values of Rh=O(10) the importance of coupling between acoustic, gravity and shear waves is demonstrated numerically. The damping of acoustic, gravity and shear waves due to molecular viscosity in the horizontal shear flow is also demonstrated. On the basis of the new properties of atmospheric waves obtained, the horizontal wind with horizontal shear is considered as a possible reason for the formation of the short-period gravity waves as well as accompanying thermal processes during equinox and on magnetically disturbed days at mesosphere-thermosphere heights.

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