Abstract
A numerical simulation of the nonlinear evolution of an upward propagating gravity wave shows that overturning is responsible for limiting the growth of the wave via cellular convection in the moving unstable phase of the wave. Convection provides a rapid stabilization of the stratification. Wave kinetic energy reaches a level of slow growth during the nonlinear growth of the wave, while wave available potential energy increases monotonically until convection begins, at which time it exceeds wave kinetic energy by a large amount. Wave transience is responsible for generating a substantial mean wind that persists in the region of wave breakdown. Because wave breakdown occurs during the transient buildup of the wave, wave amplitude varies with height approximately as if the wave had reached saturation, even prior to breakdown. Therefore, observations of limited wave growth with height may reflect the natural and gradual nonlinear evolution of upward propagating gravity waves before breakdown.
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© 1993 Springer Science+Business Media Dordrecht
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Walterscheid, R.L., Schubert, G. (1993). Nonlinear Evolution of an Upward Propagating Gravity Wave: A Numerical Case Study. In: Thrane, E.V., Blix, T.A., Fritts, D.C. (eds) Coupling Processes in the Lower and Middle Atmosphere. NATO ASI Series, vol 387. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1594-0_14
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DOI: https://doi.org/10.1007/978-94-011-1594-0_14
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