We thank R. Molinari for providing us with the subsurface temperature data and W. Sturges for providing us preprints of his papers prior to publication. Comments by G. Mellor and two anonymous reviewers were most helpful to improve the manuscript. The research was supported by the NOAA’s Atlantic Climate Change Program, Grant NA36GP0262, the Office for Naval Research Grant N00014-93-1-0037, and by the NOAA’s Geophysical Fluid Dynamics Laboratory.
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