This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2013-0004008), and by the Korea Meteorological Administration Research and Development Program under Grant CATER 2012-3084. The authors would like to acknowledge the support from KISTI supercomputing center through the strategic support program for the supercomputing application research (KSC-2012-G3-07).
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