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Edwin P. Gerber and Geoffrey K. Vallis

maintain the existence of the jet. This self-maintenance mechanism reinforces the jet at the latitude of peak winds, and so could extend persistence of jet anomalies as well. In this paper, we use a dry primitive equation model of the atmosphere to focus on the interactions between eddies and the large-scale flow. It has been demonstrated that atmosphere-only models can well capture the essential dynamics of both the NAO and annular modes ( Limpasuvan and Hartmann 2000 ; Cash et al. 2002

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

1. Introduction In an attempt to improve our understanding of the nature of the interaction between the atmosphere and ocean in setting the climate of the planet, we have begun a series of highly idealized geophysical fluid dynamics (GFD) experiments with a numerical model of the coupled atmosphere–ocean–ice system. Our goal is not to simulate the present climate, or that of any other period in Earth history. Rather, it is to study the details of a coupled system in which complications of

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I. G. Watterson

in the response of climate models to greenhouse gas and aerosol forcings. Quart. J. Roy. Meteor. Soc. , 131 , 259 – 280 . Watterson , I. G. , and J. Syktus , 2007 : The influence of air–sea interaction on the Madden–Julian oscillation: The role of the seasonal mean state. Climate Dyn. , 28 , 703 – 722 . Yu , J-Y. , and D. L. Hartmann , 1993 : Zonal flow vacillation and eddy forcing in a simple GCM of the atmosphere. J. Atmos. Sci. , 50 , 3244 – 3259 . Fig . 1. Statistics

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