Lecture 13-15 Atmospheric Instability

20 l straaform cloud stability reached 21

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Unformatted text preview: iabaAc lapse rates and the starAng temperature difference 16 Determining Atmospheric Stability Al2tude (m)) 0 200 400 600 800 1,000 1,200 Adiaba2c Lapse Environmental Rate (10°C/1,000m) Lapse Rate (5°C/ 1,000m) 30 25 Environmental Lapse Rate (20°C/ 1,000m) 25 17 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 30 25 25 200 28 24 21 400 26 23 17 600 24 22 13 800 22 21 9 1,000 20 20 5 1,200 18 19 1 18 Environmental Lapse Rate – Stable l༆  Environmental lapse rate < Adiaba2c lapse rate, ΔT decreases with height so rising air pocket’s meets local temperature sooner l༆  Atmosphere is therefore STABLE as a driver prohibits ability of air to rise 19 Can We See This? l༆  Atmospheric moisture and the dew point provide an excellent visual guide! 20 l༆  StraAform cloud – stability reached 21 Environmental Lapse Rate - Unstable l༆  Environmental lapse rate > Adiaba2c lapse rate, ΔT increases with height so rising air pocket’s temperature diverges from environment temperature l༆  Atmosphere is therefore UNSTABLE as a driver encourages ability of air to rise 22 l༆  Example of an unstable atmosphere (cumulonimbus cloud) 23 An Unstable Atmosphere in Two Rates 24 CondiAonal Stability l༆  The environmental lapse rate may be greater than and also less than the adiabaAc one….if the air mass moves from being unsaturated to saturated l༆  Happens as the air mass hits the dew point as it...
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