Two reviewers provide us with valuable advice and comments. The authors also received considerable assistance from Dr. Satoshi Sakai, the editor, with the preparation of text, figures, and tables in the html environment. In addition, the authors also wish to acknowledge the assistance of phys_admin members of the Graduate School of Environmental Science , Hokkaido University, who provided us with a great deal of cooperation and advice on software installation and setup. The authors would like to express their deep appreciation to the above-mentioned individuals. The numerical simulations is conducted on the NEC SX-3 supercomputer of the Center for Global Environmental Research of the National Institute for Environmental Studies. The figures in the present work are drawn with the use of 1) the GFD-DENNOU club library, which is developed under the leadership of Assistant Professors Masato Shiotani and Satoshi Sakai and 2) gtool3, the grid data analysis tool developed by Dr. Atsushi Numaguti. The present article is prepared with the following conversion filters:
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