Stable Equilibrium Unstable.

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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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Presentation transcript:

Stable Equilibrium Unstable

Neutral Equilibrium

?_________ ? Equilibrium

? ______ ? Equilibrium

Unsaturated Air Adiabatic cooling Adiabatic warming

Saturated Air (on the way up) Adiabatic cooling Adiabatic warming 18 oC 18 oC Adiabatic warming 24 oC 28 oC 30 oC 38 oC

Stable Atmosphere Dry air 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

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 Do Both Warm the air above Cool the air below

Making the air more unstable Do Both cool the air above warm the air below

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)

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