lecture 6 - Composition/Characterstics of the Atmosphere...

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Composition/Characterstics of the Atmosphere 80% Nitrogen, 20% Oxygen- treated as a perfect gas Lower atmosphere extends up to 50 km. Lower atmosphere most active part of atmosphere where most of the mass and energy transfer (leading to earth’s weather patterns) occurs. It is divided into two parts distinguished by their temperature distribution -- the troposphere and the stratosphere. Upper atmosphere doesn’t play much of a role in the determination of weather.
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Characteristics of the Atmosphere Altitude (km) Temperature ° C 8 - 16 km 50 km 100 km upper atmosphere lower atmosphere Tropopause Stratopause Mesopause -80 -60 -40 -20 0 20 sharp change in temp. and pressure produce Jet Streams Troposphere Stratosphere Mesosphere Thermosphere poles equator
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Characteristics of the Troposphere Variable thickness (8 km poles, 16 km equator). Decreasing temperature with elevation (linear). Well defined pressure gradients (max. pressure at bottom). non-linear Well defined distribution of moisture and suspended particles (max. at bottom) Sharp air velocity gradient. At earth’s surface velocity is zero (no-slip condition) and velocity increases over 2700 m thick boundary layer according to a logarithmic velocity profile
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This note was uploaded on 03/27/2012 for the course AOE 4643 taught by Professor Graham during the Fall '11 term at University of Florida.

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lecture 6 - Composition/Characterstics of the Atmosphere...

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