EH acknowledges the support of the Office of Naval Research (ONR) Program Element (PE) 0602435N, and the NRL base program. BM acknowledges the support of the National Oceanographic Partnership Program (NOPP) through ONR Contract N00014-08-1-0250. WS acknowledges the support of NOPP through ONR Contract N00014-10-1-0145 as well as the National Science Foundation (NSF) through Grant ATM-0837932. The authors thank Jim Kossin and an anonymous reviewer for insightful comments that led to improvements in this manuscript. The authors also thank Scott Fulton, John Knaff, Mark DeMaria, Melinda Peng, and Jim Doyle for their comments and assistance.
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