This study is based in part on Jan Hafner’s Ph.D. dissertation at the University of Alabama in Huntsville. The authors wish to thank Drs. Toby N. Carlson and Robert D. Bornstein for helpful discussion and suggestions. Dr. J. L. Aaron Song is thanked for his help with model runs. This research was funded by the U.S. Department of Energy’s National Institute for Global Environmental Change (NIGEC) through the Southeast Regional Center at the University of Alabama–Tuscaloosa (DOE Cooperative Agreement DE-FC03-90ER61010). (Financial support does not constitute an endorsement by DOE of the views expressed in this work.) The Czech Academy of Science and the National Aeronautics and Space Administration (Grant NAS8-97082) are acknowledged for supporting the preparation and publication of the manuscript.
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