The authors greatly appreciate the comments by the anonymous reviewers, especially for pointing out the difficulty in naive derivation of the Rhines scale. This work was supported by the Grants-in-Aid for Scientific Research of the Japan Society for the Promotion of Science. Numerical computations were carried out at the Astronomical Data Analysis Center of the National Astronomical Observatory, Japan, and at the Academic Center for Computing and Media Studies of Kyoto University, Japan. Data analysis and visualization were done using the software products of the GFD Dennou Ruby project (http://ruby.gfd-dennou.org/).
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