We are grateful to Prof. T. Yasunari, Dr. T. Tomita, Dr. S. Emori, and Dr. T. Enomoto of the Frontier Research System for Global Change for discussing our study. We would also express our thanks to Prof. T. Nakajima of the University of Tokyo, and Dr. A. Numaguti for providing valuable technical comments. The data used are provided by the European Centre for Medium-Range Weather Forecasts (ECMWF).
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