[1] Hokkaido Univ, Inst Low Temp Sci, Pan Okhotsk Res Ctr, Kita Ku, Sapporo, Hokkaido 0600819, Japan
[2] Univ Tokyo, Atmosphere & Ocean Res Inst, Kashiwa, Chiba 2778564, Japan
[3] Cent Res Inst Elect Power Ind, Environm Res Lab, Abiko, Chiba 2701194, Japan