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Yuji Kitamura and Keiichi Ishioka

geopotential anomaly, and ( U , V ) = ( u , υ ) 1 − μ 2 ( u and υ are zonal and meridional velocity components, respectively). These equations are characterized by two nondimensional parameters: Rossby number Ro = U 0 /2 a Ω and Froude number Fr = U 0 / Φ 0 . Here, U 0 is the representative velocity scale, a is the radius of the sphere, Ω is the planetary angular velocity, and Φ 0 is the mean value of geopotential. No forcing term is included in the equations, because our focus is on decaying

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Shin Takehiro, Michio Yamada, and Yoshi-Yuki Hayashi

maintained by small-scale forcing, the zonal flows may prevent the propagation of the Rossby waves to higher latitudes and the subsequent accumulation of kinetic energy into the circumpolar jets. The forced turbulence cases on a rotating sphere exemplified by Nozawa and Yoden (1997a , b ) and Huang and Robinson (1998) might be such cases. Continuously excited vortices might enhance in situ jets and cause homogeneous global banded structures. Acknowledgments All comments by reviewers are greatly

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