We appreciate the three anonymous reviewers for their helpful comments. The GFD-DENNOU library (SGKS Group 2001) was used for graphical output. This work was supported in part by the Grant-in-Aid for Scientific Research of the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan, and by the Kyoto University Active Geosphere Investigations for the 21st Century COE (KAGI 21), which was approved by the MEXT of Japan.
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