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Unformatted text preview: 3/25/2008 1 ESM 236: The Mountain ESM 236: The Mountain Snowpack Snowpack Snow Metamorphism Water vapor movement in snow Water vapor movement in snow Vapor flow depends on vapor pressure gradient and how the pore space and ice interconnect Transfer is from small crystals to large ones, and from warm surfaces to colder surfaces 2 For a given temperature, equilibrium vapor pressure is higher over a convex surface and lower over concave surface Only important at radii << 1 m Hand-to-hand diffusion across pore spaces Depositing vapor raises temperature of receiving grain Saturation vapor pressure Saturation vapor pressure 10 pressure, mb water ice 3 0.1 1-40-35-30-25-20-15-10-5 temperature, C saturation vapor Temperature and growth rate Temperature and growth rate Changes are more rapid at higher temperatures Under-saturated environment: crystals sublimate Supersaturated environment: crystals grow Large crystals grow at expense of small ones 4 Large crystals grow at expense of small ones Equilibrium growtheffects of curvature and modest temperature gradient cause rapid destruction of original snow crystal shape and bonding between grains Kinetic growthhigh T gradient, possibly leading to depth hoar, with poor bonding Depth hoar and thin section Depth hoar and thin section 5 Crystal types and properties...
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This note was uploaded on 08/06/2008 for the course ESM 236 taught by Professor Dozier during the Spring '08 term at UCSB.
- Spring '08