This work was supported by the National Science Foundation (NSF) Physical Meteorology Program Grant ATM-0752893 to Stevens Institute of Technology as well as through NSF Grant DGE-0742462 supporting GK-12 fellowships. The work was also supported by the Norwegian Research Council through its International Polar Year program and the project IPY-THORPEX (Grant 175992/S30, www.ipy-thorpex.no). The support of the National Science Foundation and the Norwegian Research Council is gratefully acknowledged. We have benefitted from constructive suggestions provided by two anonymous reviewers, which led to significant improvements of the paper.
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