The authors are grateful to Chris Bretherton, David Battisti, Peter Huybers, Carl Wunsch, Richard Alley, and Ed Sarachik for insightful conversations; to two reviewers, both of whom pointed out the integral connection between the records; and to Andrew Weaver, the editor. EJS was supported in part by NSF, and GHR acknowledges support from the Joint Institute for the Study of the Atmosphere and Ocean, and the Program on Climate Change at the University of Washington.
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