Ice cyrstals grown from the vapor at temperatures lower than -15゜C

元データ 国立極地研究所

概要

By analyzing photomicrographs, the nature of ice crystals grown at temperatures lower than -15℃ was studied first. It was found that in the initial stage of growth, the frequency of occurrence of single-crystalline ice decreases as the temperature decreases although the type of nuclei and method of seedings affects it considerably, and that at temperatures below about -17℃, the lower the temperature the greater the growth rate of polycrystalline ice as compared to that of single-crystalline ice. Second, large ice crystals were grown in an unforced air flow cloud chamber and the nature of polycrystalline ice growing at temperatures lower than about -20℃ was investigated with the following findings : the most prominent polycrystals are those with a sharp growing tip and having a few or many side branches; the most abundant polycrystals are those having a smaller growth rate than the former and being composed of a single or several radially grown branches of assemblages of plates, columns or irregular crystals; radially grown polycrystals are very fragile.

著者

OHNO Takayuki Department of Cardiovascular Surgery, Mitsui Memorial Hospital
Wada Makoto National Institute For Polar Research
YAMASHITA Akira Department of Biostatistics, Graduate School, Kansai Medical University
Ohno Takayuki Department Of Cardiovascular Surgery Mitsui Memorial Hospital
Ohno Takayuki Department Of Earth Science Osaka Kyoiku University
Asano Asaharu Department of Earth Science, Osaka Kyoiku University
Asano Asaharu Department Of Earth Science Osaka Kyoiku University
Yamashita Akira Department Of Earth Science Osaka Kyoiku University
Yamashita Akira Department Of Anatomy Hamamatsu Medical University
Wada Makoto National Inst. Polar Res. Tokyo

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