The authors thank Jason Cole, Chuck Pavloski, and Douglas Mast for helpful discussions and advice during the conduct of this research. The majority of this project was carried out while the first author was a graduate student at the Pennsylvania State University, supported in part under a National Science Foundation Graduate Fellowship. Additional funding was provided by the Environmental Sciences Division of the U.S. Department of Energy (Grants DE-FG02-90ER-61071 and DE-A1005-90ER-61069) as part of the Atmospheric Radiation Measurement Program, Battelle, Inc. (Contracts 354048-AQ5 and 354879-AQ5), and NASA’s Science Mission Directorate through the GEWEX SRB and CERES projects.
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