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Diffusion Deposition

Diffusion Deposition. Diffusion Deposition. Diffusion Deposition. At a given temperature, the vapor pressure over a water surface is greater than that over an ice surface.

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Diffusion Deposition

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  1. Diffusion Deposition Diffusion Deposition Diffusion Deposition • At a given temperature, the vapor pressure over a water surface is greater than that over an ice surface. • Due to this gradient, water vapor moves from the higher pressure surrounding the droplets to the lower pressure surrounding the crystals. • Thus, the ice crystals grow at the droplets' expense. This process creates sub-saturation with respect to water, and the droplets evaporate to maintain water saturation, making additional water vapor available for ice crystal growth. • Eventually the pool of liquid water diminishes and the cloud becomes glaciated.

  2. Diffusion Deposition (cont.) • The rate of diffusion is highest where the difference between the saturation vapor pressure between ice and supercooled liquid water is greatest. Optimal growth rates occur near -15°C.

  3. Summary • Layer 1 (Ice Producing): -12C for ice. • Layer 2 (Warm Layer?) • Evaporation or Sublimation Layer? • Layer 3 (Surface) ●0C at surface or lower? ●Can FZRA turn to IP (trend to colder/deeper air)? SN? -12C? ●Tw > 33F possibly rain (greater than 1000ft)

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