This material is based upon work supported by the National Science Foundation (NSF) Division of Arctic Sciences under Cooperative Agreement ATM-0301213/CSA ARC-0733058, by the NSF Division of Atmospheric and Geospace Sciences under Cooperative Agreement AGS-0918398/CSA AGS-0939962, and by the National Aeronautics and Space Administration under Award NNX08AN57G issued through the Earth Science Division, Science Mission Directorate. One of the authors is supported by the Global R&D Center Program (GRDC) of the National Research Foundation of Korea (NRF) sponsored by the Korea Ministry of Education, Science and Technology (MEST). We thank the ECMWF and the Data Support Section of NCAR for providing the ERA-Interim data.
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