Vapour Growth of Ice Crystal between -40 and -90C

[摘要] Ice crystal growth from vapour was studied using a small, diffusion cold-box composed of thermoelectric cooling panels.Within a range of -40 to -90°C, the crystals have a prismatic habit of growth, either in solid prisms or in hollow sheaths, depending upon the saturation ratio of the vapour. Long prisms and whiskers are often observed at low supersaturation, between -45 and -50°C. Pyramidal faces appear at the end of prisms between -50 and -90°C.At very high supersaturation, around -90°C, the growth of a peculiar type of dendritic crystals are observed.

[学科分类] 大气科学