This work was supported by NASA Headquarters through Earth System Science Fellowship Grant NGT5-30405. Data were obtained from the Atmospheric Radiation Measurement Program sponsored by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research, Environmental Sciences Division. Many thanks are given to the reviewers of this manuscript who provided extremely helpful and thorough recommendations and to Guido Salvucci and Bruce Anderson for their comments and suggestions.
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