Meteorology - I. The Atmosphere a. Air Pressure - Force of...

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I. The Atmosphere a. Air Pressure - Force of weight of air column i. Varies with altitude – decreases as altitude increases 1. Average pressure at sea level is 1013.25 mb ii. Common altitude – mean sea level b. Moisture i. Vapor pressure 1. Ranges from near zero in a dry cold atmosphere to about 60 mb  in a humid tropical atmosphere ii. Saturation 1. Invisible vapor condenses into visible cloud droplets a. Saturation vapor pressure b. Atmosphere’s capacity for water vapor and saturation vapor  pressure depends on temperature iii. Relative humidity – describes the atmospheric moisture 1. Dependant on the amount of moisture in the air (vapor pressure)  and the amount of moisture the air can contain when it is  saturated (saturation vapor pressure) a. Saturated air has 100% relative humidity 2. Relative humidity = (vapor pressure/saturation vapor pressure) x  100% iv. Water phase change 1. Latent heat is required for phase change 2. Gas changes a. Condensation (liquid) heats atmosphere
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b. Deposition (solid) heats atmosphere
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This note was uploaded on 09/14/2008 for the course GEOG 120 taught by Professor Garrity during the Fall '08 term at SUNY Geneseo.

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Meteorology - I. The Atmosphere a. Air Pressure - Force of...

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