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Stable Equilibrium Unstable
?_________ ? Equilibrium
? ______ ? Equilibrium
Adiabatic cooling Adiabatic warming Unsaturated Air
Adiabatic cooling Adiabatic warming Saturated Air (on the way up) 30 o C 24 o C 18 o C 28 o C 38 o C
Stable Atmosphere Lifted, unsaturated air at each level is colder and heavier than the air around it. If given the chance the parcel would return to its original position Dry air
Stable Atmosphere Moist air
Unstable Atmosphere Dry air
Unstable Atmosphere Moist Air air
Stable Atmosphere Dry air
Unstable Atmosphere Moist air
Making the air more stable Warm the air above Cool the air below Do Both
Making the air more unstable cool the air above warm the air below Do Both
Subsidence Inversion (creating a stable environment through sinking air) +4.6 km = + 46 °C +4.2 km = + 42 °C
More or Less Stable?
Convective instability (creating an unstable environment through rising air)
If θ/z = 0, the atmosphere is said to be neutral,or neutrally stratified, and the lapse rate is equal to the dry adiabatic lapse rate (DALR) Γ d ~= 10.
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[ORIGIN from Greek anemos wind][ORIGIN from Greek baros weight]
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