The authors are grateful to George Boer, Virginie Lorant, Adam Monahan, and Ian Watterson for their comments on an initial draft of the paper. DJL was supported by NSF grant ATM-9873691 from the Climate Dynamics Program, Atmospheric Sciences Division.
Held, I. M., , and M. J. Suarez, 1994: A proposal for the intercomparison of dynamical cores of atmospheric general circulation models. Bull. Amer. Meteor. Soc., 75 , 1825–1830.
Lorenz, D. J., , and D. L. Hartmann, 2003: Eddy-zonal flow feedback in the Northern Hemisphere winter. J. Climate, 16 , 1212–1227.
Panetta, R. L., 1993: Zonal jets in wide baroclinically unstable regions: Persistence and scale selection. J. Atmos. Sci., 50 , 2073–2106.
Swanson, K. L., 2001: Upper-level potential vorticity fluctuations and the dynamical relevance of the time mean. J. Atmos. Sci., 58 , 1815–1826.
Thorncroft, B. J., , C. D. Hoskins, , and M. E. McIntyre, 1993: Two paradigms of baroclinic-wave life-cycle behavior. Quart. J. Roy. Meteor. Soc., 119 , 17–55.