Lecture 13-15 Atmospheric Instability

L what happens if they are dierent l global movement

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Unformatted text preview: Understanding that T proporAonal to height (Lapse rate = - dT/dh) •  Specific heat capacity of air •  Natural gas laws Dry and Saturated AdiabaAc Lapse Rates 11 l༆  Therefore approximately 10°C in unsaturated air l༆  Approx. 6°C in saturated air l༆  Average air temperature on Mt. Everest: - 19°C to - 60°C (avg. - 36°C winter) Environmental Lapse Rate l༆  Actual temperature change measurement is the Environmental Lapse Rate l༆  NOT necessarily the same as the adiabaAc lapse rate 12 Why does Enviro Lapse Rate Change? l༆  What happens if they are different? l༆  Global movement of air can introduce new colder air higher up, radiaAve cooling to space l༆  Intense heaAng on ground due to the sun means higher lapse rate l༆  Approach of cold dense air forces warmer air upwards l༆  Eddies in the atmosphere can prevent what nature wants from happening 13 Determining Atmospheric Stability Al2tude (m)) 0 100 200 300 400 Adiaba2c Lapse Environmental Rate (10°C/1,000m) Lapse Rate (5°C/ 1,000m) 20 20 Environmental Lapse Rate (20°C/ 1,000m) 20 14 Determining Atmospheric Stability Al2tude (m)) Adiaba2c Lapse Environmental Rate (10°C/1,000m) Lapse Rate (5°C/ 1,000m) Environmental Lapse Rate (20°C/ 1,000m) 0 20 20 20 100 19 19.5 18 200 18 19 16 300 17 18.5 14 400 16 18 12 15 Environmental Lapse Rate l༆  What happens to a pocket of air that’s rising adiabaAcally (e.g. due to solar gain from below)? l༆  DEPENDS on the relaAonship btn the Environmental and the Ad...
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This document was uploaded on 01/17/2014.

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