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John Marshall, David Ferreira, J-M. Campin, and Daniel Enderton

, yields an ocean circulation pattern that is very different from our own. It comprises zonal jets whose direction is set by that of the prevailing winds above. We observe easterlies in the tropical belt and westerlies in mid–high latitudes. The dynamics of these zonal jets is reminiscent of that of the present-day Antarctic Circumpolar Current. The structure of the thermocline is controlled by eddy processes that (due to the tiny Rossby deformation radius in the ocean) must be parameterized rather

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Adam P. Showman

1. Introduction The large-scale circulation and banded appearance of Jupiter and Saturn have been major puzzles since high-resolution images of these planets were returned by the Voyager and Pioneer spacecraft in the 1970s. Salient features include numerous zonal jets (∼30 on Jupiter and ∼20 on Saturn); strong prograde (eastward) equatorial flows, peaking at ∼150 m s −1 on Jupiter and ∼400 m s −1 on Saturn; and numerous coherent vortices ranging in size from the limit of image resolution

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D. G. Dritschel and M. E. McIntyre

pumped global-scale circulations such as the Brewer–Dobson circulation of the terrestrial stratosphere. 1 The range of such stresses is not limited to mixing lengths, but can reach out as far as waves can propagate. And, crucially, there is a strong dynamical interplay between the more wavelike and the more turbulent aspects, not unlike the wave–turbulence interplay and stress divergence that give rise to alongshore currents in an ocean beach surf zone. Among the consequences of such interplay, in

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