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Dong L. Wu and Stephen D. Eckermann

Radiometry; Preusse et al. 2006 ). These techniques deduce atmospheric pressure and/or temperature from optically thin radiances and can measure GW-induced temperature perturbations with slightly better vertical resolution but relatively poorer horizontal resolution than MLS. Thus, the resolved GW-induced temperature variances from these instruments correspond to different portions of the three-dimensional (3D) GW wavenumber spectrum than those based on saturated radiances ( Wu et al. 2006a ). Second

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Y. D. Afanasyev, P. B. Rhines, and E. G. Lindahl

were performed using the optical thickness of a dyed thin interfacial layer. A natural choice of flow for investigating the spontaneous imbalance is a baroclinic jet. A few recent numerical simulations ( O’Sullivan and Dunkerton 1995 ; Zhang 2004 ; Viudez and Dritschel 2006 ) describe the emission of inertia–gravity waves by unstable baroclinic jet. In simulations by Viudez and Dritschel (2006) the emission is highly localized in space and occurs only “at the largest curvature side of the

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Paul D. Williams, Thomas W. N. Haine, and Peter L. Read

inertia–gravity waves are energized ( Warn et al. 1995 ; Vallis 1996 ; Wirosoetisno et al. 2002 ). Furthermore, the waves may be sufficiently weak that they merely perturb the slow manifold into a fuzzy manifold ( Warn and Menard 1986 ), which retains many of its useful properties. The amplitude of inertia–gravity waves and its dependence on the bulk flow properties are therefore of great interest. Despite general agreement that the amplitude should decrease with decreasing Rossby number, Ro

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