We thank Drs. Mark Serreze and James Maslanik for helpful discussions. We also thank an anonymous reviewer and Professor J. M. Wallace for encouraging us to pursue the summer sea ice variability. Drs. M. Alexander, U. Bhatt, J. Hurrell, S. Peng, D. Thompson, and K. Trenberth provided helpful comments on an earlier version of the manuscript. Dr. Jim Hurrell kindly provided the NAO record. The graphics were produced with the GrADS software package developed by Brian Doty. This study was supported in part by grants from NSF Physical Oceanography “Atlantic Circulation and Climate Experiment” to C. Deser and M. Alexander and from NASA Grant POLAR97-0015 to J. Walsh.
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