The authors thank Peter Gent and Justin Small for helpful comments that improved this manuscript. This work was supported under the Advanced Study Program at the National Center for Atmospheric Research (NCAR). NCAR is supported by the National Science Foundation (NSF). We also thank Randy Watts, Kathy Donohue, and Karen Tracey for their processing of the KESS data. KESS was supported by NSF Grants OCE02-21008 and OCE08-51246.
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