Possible High Ice Particle Production during Graupel–Graupel Collisions

Tsutomu Takahashi Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan

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Yoshihiro Nagao Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan

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Yuzuru Kushiyama Department of Earth and Planetary Sciences, Kyushu University, Fukuoka, Japan

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Abstract

In a cold room collisions of two ice spheres having different growth modes were studied to examine ice production. The production of ice particles through this process was high, with a maximum rate more than 800 per collision at −16°C. This ice particle production mechanism is different from the Hallett–Mossop ice multiplication process and may help to explain the high concentrations of ice crystals observed in maritime winter cumuli.

Abstract

In a cold room collisions of two ice spheres having different growth modes were studied to examine ice production. The production of ice particles through this process was high, with a maximum rate more than 800 per collision at −16°C. This ice particle production mechanism is different from the Hallett–Mossop ice multiplication process and may help to explain the high concentrations of ice crystals observed in maritime winter cumuli.

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