We are grateful to Robert H. Whritner and Elizabeth A. Nelson of the Arctic and Antarctic Research Center for their help with satellite data collection and processing, to Si-Chee Tsay at NASA/Goddard Space Flight Research Center for help with the radiative transfer model, and to Kevin Engle at University of Alaska, Fairbanks, for his help with the use of the TeraScan system. We thank Steve Warren and two anonymous reviewers for constructive criticism that helped improve the quality of this paper. This work was supported by the National Science Foundation through Grant OPP91-140010 to the University of Alaska and by the Environmental Sciences Division of the U.S. Department of Energy (DOE Contract 091574-A-Q1 to the University of Alaska) as part of the Atmospheric Radiation Measurement program.
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