This research was supported in part by the Department of Energy through Grant Battelle 327421-A-N4; the Department of Energy through Grant DE-FG02-90ER61071; and in part by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research, Environmental Sciences Division, under Contract W-31-109-Eng-38, as part of the Atmospheric Radiation Measurement Program. We thank Ed Westwater and Roger Marchand for stimulating discussions.
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