9-8 notes - Geography 1111 9/8/08 Clouds, Fog, and P...

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Geography 1111 9/8/08 Clouds, Fog, and Precipitation 1. Lifting mechanisms 2. Cloud classification 3. Fog formation 4. Types of precipitation Lifting mechanisms Orographic lifting: found over a mtn. Dynamic convergence: wind field seems to naturally converge. Winds from opposite directions blow together at Earth’s surface. Thermal convection: warm air at Earth’s surface it will rise/expand. o First Law of Thermodynamics: Change in Heat= Change in Temp + Change amount of Work o If heat is added to an air parcel it can: Increase temp. Expand in size (decrease density) As density is reduced, warmed air is more buoyant, and it rises. (increase surface temp more unstable!) Frontal wedging: When warm and cold air collide along a front, warm air rises above the wedge of cold air. o First Law of Thermodynamics Change in Heat= Change in Temp + Change in work If heat is removed from an air parcel it can: Decrease temp Decrease work (shrink, or increase density)
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9-8 notes - Geography 1111 9/8/08 Clouds, Fog, and P...

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