The authors would like to thank Shafer Smith, Paul Kushner, and Geoff Vallis for helpful comments about this work. All simulations were performed on the supercomputers at NOAA's Geophysical Fluid Dynamics Laboratory, using a quasigeostrophic code originally written by S. Smith and G. Vallis and parallelized by GL and S. Smith. GL was funded under a grant/cooperative agreement with the National Oceanic and Atmospheric Administration (NA07RG0002).
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