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We present measurements of the growth of long columnar ice crystals fromwater vapor over a broad range of temperatures and supersaturation levels inair. Starting with thin, c-axis ice needle crystals, we observed theirsubsequent growth behavior in a vapor diffusion chamber, extracting the initialradial growth velocities of the needles under controlled conditions.Approximating the hexagonal needle crystals as infinitely long cylinders, wecreated an analytical growth model that includes effects from particlediffusion of water molecules through the surrounding air along with thediffusion of heat generated by solidification. With only minimal adjustment ofmodel parameters, we obtained excellent agreement with our experimental data.To our knowledge, this is the first time that the combined effects fromparticle and heat diffusion have been measured in ice growth from water vapor.This analysis further provides an accurate method for calibration of thewater-vapor supersaturation levels in experimental growth chambers.

Measurements of Cylindrical Ice Crystal Growth Limited by Combined Particle and Heat Diffusion