The study was supported by the U.S. Department of Energy under Atmospheric Radiation Measurement (ARM) Grant DE-FG02-97ER2361. The authors are grateful to Dr. H. Barker for the provision of some ground-based surface radiation data. The use of data from the ARM program, the NASA Langley Research Center EOSDIS Distributed Active Archive Center, CNES (France), NCAR–NCEP, as well as WMO BRSN and NOAA SURFRAD radiation archives should also be acknowledged. We are thankful to Dr. J. Michalsky (Atmospheric Sciences Research Center, The University at Albany, State University of New York) for making available a dataset used for retrieving aerosol optical depth over the ARM SGP site in Oklahoma.
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