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Dong L. Wu and Stephen D. Eckermann

component of propagation of subtropical GWs observable by MLS in the lower stratosphere in January 2005 is equatorward in both hemispheres. However, the situation is quite different in January 2006 when the descending variances at 21.7 km exceed the ascending variances almost everywhere in the tropics (see also Fig. 8 ), implying widespread northward propagation components, and thus possible GW–quasi-biennial oscillation (QBO) interactions here (e.g., Eckermann et al. 1995 ; Vincent and Alexander

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Chris Snyder, David J. Muraki, Riwal Plougonven, and Fuqing Zhang

spontaneously from the larger-scale jet. We examine that possibility in the present paper using numerical simulations of a dipole vortex in a rotating, stratified fluid. Because it possesses a localized jet between the two counter-rotating constituent vortices, the dipole vortex is a natural idealization of atmospheric “jet streaks” ( Houghton et al. 1981 ; Van Tuyl and Young 1982 ; Cunningham and Keyser 2004 ). Large-scale atmospheric and oceanic flows outside the Tropics are nearly balanced; that is

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