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R. K. Scott and L. M. Polvani

-selective hyper- and hypodiffusion, acting at small and large scales, respectively: The subscripts h and l refer to the dissipation acting on high and low wavenumbers, respectively. For the small scales we use δ h = 4 and ν h = 10/[ N ( N + 1)] δ h (i.e., a damping time scale of 0.1 on the highest wavenumbers). For the large-scale dissipation, three choices are discussed in section 4: (i) a Rayleigh friction with δ l = 0; (ii) a radiative relaxation, again with δ l = 0 but applied only to the

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Yohai Kaspi and Glenn R. Flierl

have studied zonal jets appearing from geostrophic turbulence ( Cho and Polvani 1996 ; Huang et al. 2001 ; Huang and Robinson 1998 ; Lee 2005 ; Manifori and Young 1999 ; Smith 2004 ; Vallis and Maltrud 1993 ). Panetta (1993) showed that jets can emerge from baroclinic instability in a two-layer model that has an imposed thermal gradient. This model allows transfer of energy from the upper to the lower layer and results in an equivalent barotropic jet. These jets seem persistent and stable

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