The comments and suggestions provided by two anonymous reviewers were extremely useful and helped the authors to improve and focus this paper. The first author also would like to thank Dr. Jimmy M. Ferng and other staff at the Computer Center and Information Technology, University of Arizona, for their help and support. Primary support for this research was provided under the NASA/EOS Interdisciplinary Research Program (NAG5-11044), the NOAA GAPP Program (NA16GP1605), and the NSF-STC Program (Agreement EAR-9876800).
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