08precipitation.big

08precipitation.big - Ch. 5: Precipitation Terminal...

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1 Ch. 5: Precipitation • Terminal Velocity • Condensation Growth Cloud Droplets Ice Crystal Process (WBF) • Collision Growth Collision/Coalescence, Accretion, Aggregation • Precipitation Types • Precipitation Measurement • Precipitation Modification
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2 Terminal Velocity Gravity Air Drag Drag force Speed Falling object increases speed until drag force = gravitational force Steady-state fall Speed = Terminal velocity
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3 Condensation Growth of Droplets Vapor Cloud droplet 100x increase in diameter 10 6 x increase in volume to grow up to drizzle drop size Drizzle drop
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4 Condensation Growth of Ice Crystals “Ice Crystal Process” Supersaturated for crystals Subsaturated for droplets e sat,i < e sat,w T < 0°C Supercooled droplets Ice crystal
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5 Condensation Growth of Ice Crystals “Ice Crystal Process” Droplets evaporate Crystals grow Water transfers from droplets to crystal
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Collision/Coalescence Growth of Raindrops Faster growth than condensation! • Conditions favoring growth
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This document was uploaded on 09/03/2009.

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08precipitation.big - Ch. 5: Precipitation Terminal...

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