The authors thank Jason Cole for his analysis of the Nauru99 radiometer data, which are presented in Fig. 1; Kevin Widener for his work on the installation and operation of the NIES site; and Robin Perez for her initial analysis of the NIES radiometer data. We also thank three anonymous reviewers for their helpful comments on the manuscript. This research was supported by the Office of Biological and Environment Research of the U.S. Department of Energy under contract DE-AC06-76RL01830 to the Pacific Northwest National Laboratory as part of the Atmospheric Radiation Measurement Program.
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