| Term: | Glaze |
| Definition: |
A coating of ice, generally clear and smooth but usually containing some air pockets, formed on exposed objects by freezing of a film of super-cooled water deposited by rain, drizzle, fog, or possibly condensed from super-cooled water vapor ; glaze is denser, harder and more transparent, than either rime or hoarfrost. NSIDCCryosphere
(1) A solid surface deposit formed by the freezing of supercooled raindrops or possibly of condensed water vapour, distinguished from rime by having a density near that of ice. See also hoar. In this sense, glaze represents accumulation. (2) A surface deposit of ice formed by a short episode of melting that results only in recrystallization and not in percolation and is followed by a return to sub-freezing temperatures. In this sense, glaze is largely responsible for the creation of the summer surface. IHPGlacierMassBalance A coating of ice, generally clear and smooth, formed on exposed objects by the freezing of a film of supercooled water deposited by rain, drizzle, fog, or possibly condensed from supercooled water vapour. IACSSnow A coating of ice, generally clear and smooth, formed on exposed objects by the freezing of a film of supercooled water deposited by rain, drizzle, fog, or possibly condensed from supercooled water vapor. Glaze is denser, harder, and more transparent than either rime or hoarfrost. Its density may be as high as 0.8 or 0.9 g/cm^3. Factors that favor glaze formation are large drop size, rapid accretion, slight supercooling, and slow dissipation of heat of fusion. The opposite effects favor rime formation. The accretion of glaze on terrestrial objects constitutes an ice storm; as a type of aircraft icing it is called clear ice. Glaze, as well as rime, may form on ice particles in the atmosphere. Ordinary hail is composed entirely (or nearly so) of glaze; the alternating clear and opaque layers of some hailstones represent glaze and rime, deposited under varying conditions around the growing hailstone. (Also called glaze ice, glazed frost, verglas.) AMSglossary Coating of ice that forms when rain falls on a surface with a temperature below freezing. PhysicalGeography A generally homogeneous and transparent deposit of ice formed by the freezing of supercooled drizzle droplets or raindrops on objects the surface temperature of which is below or slightly above 0 C. It may also be produced by the freezing of non-supercooled drizzle droplets or raindrops immediately after impact with surfaces the temperature of which is well below 0 C. SPRI GCW |