The authors wish to thank Adam Sobel of Columbia University for sharing his expertise and insights into this problem and two anonymous reviewers for providing useful comments and suggestions for improvement of the manuscript. The authors also thank David Neelin and the Climate Systems Interactions Group at UCLA for use of the QTCM and Hui Su and Matt Munnich of UCLA for computational assistance. Funding for this research was provided by NOAA CLIVAR-Pacific Grant NA03OAR4310066.
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