We thank Halldór Björnsson for his input and assistance with the EOF and SVD analyses and Michael Mann for valuable discussions and help with the spectral analyses. Special thanks go to Yochanan Kushnir for kindly reviewing the first draft of the manuscript. We also thank Shiling Peng, John Fyfe, David Enfield, and the two anonymous reviewers for their help and suggestions. This work was supported by research grants awarded to LAM and DNS from the Canadian Natural Sciences and Engineering Research Council and Fonds FCAR (Quebec.)
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