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Chapter_3_notes - Chapter 3 Air Temperature and Air...

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Chapter 3 Air Temperature and Air Temperature Cycles ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Vertical Distribution of the Atmosphere ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ The Troposphere Layer of the atmosphere in contact with the surface Temperature decreases with height because the troposphere is heated from below (atmosphere is generally transparent to shortwave radiation) Layer that contains all weather and all clouds Extends to about 12 to 15 km; actual height varies with latitude and season (thicker as temperature increases) Much water vapor and dust from interactions with the surface Contains about 80% of the mass of the atmosphere ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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The Tropopause Small, isothermal layer above the troposphere Isothermal no temperature change with height About 12 to 15 km in height actual height varies with latitude and season ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ The Stratosphere Layer of the atmosphere above the troposphere Temperature increases with height because of absorption of ultraviolet light by ozone (O 3 ) Extends up to about 50 km in height Little exchange of air between troposphere and stratosphere little dust or water vapor Stable air layer little vertical motions because of the increasing temperature with height -- inversion ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ The Stratopause Small, isothermal layer above the stratosphere Isothermal no temperature change with height About 50 km in height ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________
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The Mesosphere Layer of the atmosphere above the stratosphere Temperature decreases with height because of a lack of contact with the ground and a lack of ozone Extends up to about 80 km in height ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ The Mesopause Small, isothermal layer above the mesosphere Isothermal no temperature change with height About 80 km in height ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ The Thermosphere Layer of the atmosphere above the mesosphere Temperature increases with height because of energy from gamma and x-ray absorption due to the earth’s magnetic field (van Allen radiation belt) Density of air at this altitude is very thin and the
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