We express our sincere thanks to Captain M. Akamine and his crew for their skillful operation of the R/V Mirai. Technical staffs of Global Ocean Development, Inc., are also acknowledged for their continuous support for meteorological observations. We greatly appreciate helpful comments of the anonymous reviewer. The authors also thank Mr. Nishi for helpful discussions. All of the figures were drawn using GrADS (http://www.iges.org/grads/) and GFD-DENNOU Library (http://www.gfd-dennou.org/index.html.en).
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