The research described in this manuscript was carried out at the Jet Propulsion Laboratory (JPL), California Institute of Technology, under a contract with the National Aeronautics and Space Administration (NASA). Support from NASA High Performance Computing and Communication (HPCC) is also acknowledged. Computations were performed on the Cray J-90 through the JPL Supercomputing project. Thanks to P. D. Killworth and N. R. Edwards for providing their BBL code and valuable discussions, and to L.-L. Fu at JPL for his continuous support. Comments from two anonymous reviewers helped to improve the original manuscript.
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