We thank M. Ortmeyer and A. Schweiger for their unfailing technical support. R. Colony, R. Lindsay, I. Rigor, and especially H. Stern provided insight into the workings of optimal interpolation, both theoretical and practical. Our understanding of the climatologies benefitted from conversations with S. Levitus and T. Boyer (WOA) and J. Morison, G. Holloway, and A. Proshutinsky (AOA). We also sincerely appreciate the valuable feedback provided by current users of this dataset. This project was funded by the NASA program POLES (Polar Exchange at the Sea Surface), Grant NAG5-4375, and by the Office of Naval Research’s High Latitude Program, Grant N00014-99-1-0780.
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