F2011GEOG1112AtmosphericStabilityLecture copy

F2011GEOG1112AtmosphericStabilityLecture copy - 1...

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1 Atmospheric Stability: Maybe the Hardest Topic of the Semester Basic question: when will air rise, and how does moisture affect this process? Price: involves math (arithmetic) and several difficult concepts. Would be a lot easier without water vapor in the air, but then we’d be toast. Payoff: explains a lot about temperature and precipitation, even about pollution (below)
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2 Ways Air Goes Up Air rises if warmer than surroundings: CONVECTION Air rises if forced up a mountain: OROGRAPHIC LIFTING So, to understand if air will “bubble up,” we need to understand temperature, how it changes in the vertical, and how to compare the temperature of a bubble of air with its surroundings. (The latter isn’t important in the forced-up-mountain case )
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3 One Process By Which Temperature Changes First, a definition: Lapse Rate: How temperature changes as you go up Adiabatic process: due only to expansion or compression of air; occurring without loss or gain of energy DEMO example: Expanding air coming out of a can of compressed air. What happens to the temperature, and why? Meteorological example: lift a “parcel” or bubble of air, the higher it goes the less air is around it to press in on it--so it expands! As it expands, it cools.
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4 THE DRY ADIABATIC LAPSE RATE (DALR) better name: dry unsaturated adiabatic lapse rate Definitions: DALR: how much temp changes as a dry air parcel goes up/down due only to the fact that the atmospheric pressure on the outside of the air parcel changes as you go up/down. Numerical value:
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F2011GEOG1112AtmosphericStabilityLecture copy - 1...

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