Atmospheric Stability, Clouds and Lapse Rates
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Transcript of Atmospheric Stability, Clouds and Lapse Rates
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Atmospheric Stability, Clouds and Lapse Rates
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Hot Air Rises
http://www.youtube.com/watch?v=YsCXw2bQU50&list=PL4D17D18D91FA431E&index=13 or
http://www.youtube.com/watch?v=0Hv07HLRlbc
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PV/T=constant
http://www.metlink.org/pdf/teenagers/experiments/candle-water.pdf
http://www.youtube.com/watch?v=cNh3N_1e4wQ&list=PL4D17D18D91FA431E
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Dry Adiabatic Lapse Rate
The rate at which dry air cools as rises through the atmosphere
DALR=9.8°C/km
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Stability
unstable stable
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How Clouds Form
http://www.youtube.com/watch?v=-nbU1TXT3Bg&list=PL4D17D18D91FA431E
When the rate of condensation is faster than the rate of evaporation, and the air is dirty, cloud droplets form. The rate of evaporation falls as the air gets colder, so there will be a certain temperature, called the dew point, at which cloud drops form.
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Latent Heat ReleaseSaturated Adiabatic Lapse Rate
• When water vapour condenses to form cloud droplets, latent heat is released
• This heat warms the air around• So, when cloud droplets are forming, the
rate at which air cools as it rises is less than the DALR
• Typically, the SALR is usually between 4°C/ km and 9°C/km, but on average its 5°C/km.
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Cloud Base Height