Transient gravity wave-critical layer interaction. I Convective adjustment and the mean zonal acceleration

Details Transient gravity wave-critical layer interaction. I Convective adjustment and the mean zonal acceleration Transient gravity wave-critical layer interaction. I Convective adjustment and the mean zonal acceleration

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jats...41..992d&link_type=abstract

Journal of the Atmospheric Sciences (ISSN 0022-4928), vol. 41, March 15, 1984, p. 992-1007.

Physics

31

Atmospheric Circulation, Atmospheric Models, Convective Flow, Gravity Waves, Wind Shear, Wind Velocity, Atmospheric Temperature, Atmospheric Turbulence, Boundary Layer Stability, Critical Flow, Wave Interaction, Wentzel-Kramer-Brillouin Method

Scientific paper

Atmospheric gravity waves have been recognized as an important dynamical mechanism by which horizontal momentum is transported upward over many scale heights, resulting in significant mean flow accelerations in the stratosphere, mesosphere, and lower thermosphere. The relevant dissipative process appears to involve the unstable breakdown of the waves via convective and/or dynamical instabilities. The present investigation is concerned with mean zonal wind accelerations due to wavebreaking. The attempt is made to test the accuracy of a semianalytic model of gravity wave-mean flow interaction advanced by Grimshaw (1975), Dunkerton (1981, 1982) and Coy (1983). The accuracy of this model, called GDC model, with respect to the accuracy of the Wentzel-Kramers-Brillouin approximation is considered, and attention is given to the validity of the global amplitude balance model of Lindzen (1981) as a 'saturation' criterion in the GDC model.

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