Acknowledgements
The authors wish to thank Profs. M. Kawabe and A. Kubokawa for helpful comments. We also thank the members of Kanagawa Prefecture Fisheries Institute for help with the observations, and Mr. K. Segawa for advice on making the NOAA images. We are thankful for the various constructive comments of the anonymous reviewer. Comments by Dr. K. Stansfield greatly helped in improving the manuscript. The current data at station HI were offered from the National Research Institute for Earth Science and Disaster. The sea level data were obtained from the Japan Ocean Data Center. This study is partly supported by Grant-in-Aid for Scientific Research 10640420 from the Japan Ministry of Education, Science and Culture.
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