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Daniel B. Whitt and Leif N. Thomas

end of the 5-day simulation shown in Fig. 13a , more than three quarters of the wave kinetic energy is in the interior (below 40 m). As revealed by a diagnostic calculation of the wave energy flux from the simulations (e.g., Fig. 14 ), more than twice as much wave kinetic energy has radiated from the surface to the interior when ω w = 0.5 f and θ w = 0 than when ω w = 0.5 f and θ w = π /2 (cf. Figs. 13a and 14a to Figs. 13b and 14b ). The enhancement of interior wave energy

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Daniel B. Whitt, Leif N. Thomas, Jody M. Klymak, Craig M. Lee, and Eric A. D’Asaro

. 10b ; between −5 and 0 km and 0 and 10 km). While trapping could lead to amplification of the superinertial waves, wave shoaling could play a role as well. The magnitude of the group velocity [defined in (13) ] varies significantly along ray paths ( Fig. 10b ) and at the separatrix the magnitude of the group velocity equals zero since ω = ω min and α = − s b . Consequently, as wave packets approach the separatrix their energy density should increase to conserve the energy flux, namely, the

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