05clouddev.big

05clouddev.big - 1 Ch 5 Cloud Development • Cloud vs Fog...

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Unformatted text preview: 1 Ch. 5: Cloud Development • Cloud vs. Fog Formation • Air Parcel Dynamics ! Adiabatic Expansion and Rising Air ! Equilibrium States/Stability ! Lapse Rates ! Dry and Moist Adiabatic Processes • Clouds and Atmospheric Stability ! Atmospheric Stability ! Cloud Lifting Mechanisms ! Cloud Formation and Stability • Cloud Types (Ch. 4) 2 Clouds and Fog The Basics: Condensed water droplets Water vapor + Air • Get condensation to occur by reducing air temperature ! Air temperature must decrease to the dew point temperature 3 Cooling of Air to Get Condensation Diabatic Adiabatic Cold ground cools air by conduction ! Heat transfer involved Fog No heat transfer between air parcel and environment 4 Adiabatic Process • Adiabatic: no heat exchange between a system and its surroundings ! Adiabatic expansion: P " , T " ! Adiabatic compression: P # , T # 5 Parcel Motion Dynamics Environmental pressure decreases as altitude increases Parcel expands, loses pressure Parcel starts with same pressure as environment Rising parcel ! adiabatic expansion ! temperature decreases 6...
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This document was uploaded on 09/03/2009.

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05clouddev.big - 1 Ch 5 Cloud Development • Cloud vs Fog...

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