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Gravity-Wave Refraction by Three-Dimensional Winds: New Effects and a New
Parametrization Scheme
Oliver Buhler
Courant Intitute of Mathematical Sciences
Abstract
Current parametrizations of gravity-wave drag in general circulation
models of the Earth's atmosphere explicitly conserve wave
pseudomomentum flux. This approach assumes a basic- state flow that
is horizontally uniform and it allows a direct connection between wave
dissipation and wave-induced forcing of the flow. However, when the
horizontal structure of the basic-state flow is no longer uniform this
approach fails. In this instance the more fundamental principle of
wave action conservation must be invoked and one can no longer
associate all wave-induced forcing with wave dissipation. This gives
rise to new interaction effects (joint work with ME McIntyre), which
can be accounted for in a new parametrization scheme (joint work with
JF Scinocca). Both will be described in this talk.
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