Chapter06b - Atmospheric Stability and Cloud Formation...

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Atmospheric Stability and Cloud Formation
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RECAP Mechanical equilibrium : stable, unstable, neutral. Adiabatic expansion/compression : no heat exchange. Adiabatic lapse rate Dry adiabatic lapse rate ~ 10 K/km Moist adiabatic lapse rate ~ 6 K/km Remember: Dry > Moist always Environmental lapse rate. Atmospheric stability : Absolutely stable atmosphere Absolutely unstable atmosphere Neutrally stable atmosphere Conditionally unstable atmosphere
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Midchapter summary The air temperature in a rising parcel of unsaturated air decreases at the dry adiabatic rate , while the air temperature in a rising parcel of saturated air decreases at the moist adiabatic rate . The dry adiabatic rate and moist adiabatic rate of cooling are different due to the fact that latent heat is released in a rising parcel of saturated air. In a stable atmosphere, a lifted parcel of air will be cooler (heavier) than the air surrounding it, and will tend to sink back to its original position. In an unstable atmosphere, a lifted parcel of air will be warmer (lighter) than the air
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Chapter06b - Atmospheric Stability and Cloud Formation...

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