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Support for this study was provided by the National Aeronautics and Space Administration under contract number NNX08AB07G, the National Oceanic and Atmospheric Administration under contract number NA08OAR4310740, and the National Science Foundation under contract number ATM-0809051. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the sponsors or any of their sub agencies.

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