The authors thank Zuojun Yu and Jim Potemra for helpful discussions about the IAB eddy field, and Ming Feng for providing Fig. 1. We are also indebted to Lynne Talley, Doron Nof, and an anonymous reviewer for perceptive comments that significantly improved the manuscript.
This work was completed at the Woods Hole Oceanographic Institution while TS Durland was supported by the Ocean and Climate Change Institute. MA Spall was supported by NSF Grant OCE-0423975 and J Pedlosky by NSF Grant OCE-0451086. TS Durland acknowledges additional report preparation support from NASA Grant NNG05GN98G.
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