The authors thank an anonymous reviewer for insightful suggestions to a former version of the manuscript and two anonymous referees reviewing the present manuscript for their useful comments. This research was supported by the Spanish Ministry of Science under Grants CGL2008-06295, MTM2011-26696, ICMAT Severo Ochoa Project SEV-2011-0087, Spanish CSIC under Grant ILINK-0145, US NSF under Grant ATM-0732222, and US ONR N000140910418 and N000141010655. The computational part of this work has benefited from an ICTS-CESGA Project 109, which allowed priority access to supercomputer Finis Terrae. The first author was supported by the FPI-UCM fellowship program. Concordiasi was built by an international scientific group and is currently supported by the following agencies: Météo-France, CNES, IPEV, PNRA, CNRS/INSU, NSF, NCAR, Concordia consortium, University of Wyoming, and Purdue University. ECMWF also contributes to the project through computer resources and support and scientific expertise. The two operational polar agencies PNRA and IPEV are thanked for their support at Concordia station. Concordiasi is part of the THORPEX-IPY cluster within the International Polar Year effort.
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