The authors gratefully acknowledge the support of the Office of Naval Research under Grant N00014-89-J-1053 and the National Science Foundation under Award OCE-95-21468. We would also like to thank Markku Santala for the use of his surface wave bias model. Discussions with Susan Wijffels, Harry Bryden, Al Plueddemann, Pierre Mourad, Craig Lee, Meghan Cronin, and Dan Rudnick were very helpful, as were comments on the manuscript from Anand Gnanadesikan and an anonymous reviewer. Nancy Brink’s ongoing help with the LOTUS observations has been invaluable.
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