Keiichi   Ishioka	Graduate School of Mathematical Sciences, University of Tokyo
	3-8-1 Komaba Meguro-ku, Tokyo, 153-8914, Japan.
	e-mail: ishioka@ms.u-tokyo.ac.jp

Michio   Ymada	Graduate School of Mathematical Sciences, University of Tokyo
	3-8-1 Komaba Meguro-ku, Tokyo, 153-8914, Japan.
	e-mail: yamada@ms.u-tokyo.ac.jp

Yoshi-Yuki   Hayashi	Department of Sciences, Hokkaido University
	Kita-10 Nishi-8 Kita-ku, Sapporo, 060-0810, Japan,
	e-mail: shosuke@gfd-dennou.org

Shigeo   Yoden	Department of Geophysics, Kyoto University
	Kitashirakawaoiwake-cho, Sakyo-ku, Kyoto-shi, 606-8502, Japan.
	e-mail: yoden@kugi.kyoto-u.ac.jp

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