ATMO 201 Lecture Notes - Cumulonimbus Cloud, De-Ice, Rain Shadow
25 Feb 2014
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Document Summary
At a given subfreezing temperature, the saturation vapor pressure over water is greater than that over ice (more molecules, more vapor pressure) Along with wegener and findeisen, discovered that ice crystals grow to form precipitation because of the different saturation vapor pressures above supercooled water and ice. Growth of ice crystals (fig 3) a. b. c. d. The ice crystal reaches its terminal velocity and starts to fall. It can collide with supercooled water drops, which freeze to it accretion or riming. It can collide with other ice crystals, and break apart, forming even more ice crystals. It can collide with other ice crystals, which can stick to it aggregation this produces snowflakes. As it gets near the ground, these might fall as snow, or melt and fall as rain. Precipitation and cloud types (fig 2) a. b. c. Precipitation in cold convection clouds () starts quickly/ cc or bergeron.
