This work was supported by the National Oceanic and Atmospheric Administration (NOAA) Arctic Research Office and the National Science Foundation (NSF; Grants OPP-0240827 and OPP-0230317). We thank C. Fowler, J. Maslanik, T. Scambos, and T. Haran for their work on the AVHRR Polar Pathfinder dataset. The National Snow and Ice Data Center (NSIDC) provided the standard APP dataset. The NCEP–NCAR reanalysis global profile dataset was provided by the NOAA–CIRES Climate Diagnostics Center. The NASA Langley Research Center provided the ISCCP D2 ozone dataset. Thanks also go to the two anonymous reviewers for their helpful comments and suggestions. The views, opinions, and findings contained in this report are those of the author(s) and should not be construed as an official National Oceanic and Atmospheric Administration or U.S. Government position, policy, or decision.
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