Comments from Michael Ghil are gratefully acknowledged. Suggestions made by anonymous reviewers also led to significant improvement of this work. Funding for this work came from NSF Grants OCE 02-221066 and OCE 03-44094. Additional funding for PB was provided by the U.K. Royal Society Fellowship and by WHOI Grants 27100056 and 52990035. Also, Ms. S. Elsner is gratefully acknowledged for assistance in manuscript preparation.
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