S.J.D.D. wishes to acknowledge the Natural Sciences and Engineering Research Council of Canada for financial support in the form of a Visiting Postdoctoral Fellowship. Also, we wish to express our thanks to Paul J. Martin of the Naval Ocean Research and Development Activity for providing us with the OWS data for stations N and P and also for helpful discussions. Last, we thank Greg Flato and two anonymous referees for insightful comments that helped improve the paper.
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