Chapter_4_notes - GEOG 101 Chapter 4 Atmospheric Moisture...

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Unformatted text preview: GEOG 101 Chapter 4 Atmospheric Moisture and Precipitation 1 ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ The Hydrosphere Hydrosphere water in the earth-atmosphere system Oceans and Salt Lakes 97.6% Ice Caps and Glaciers 1.9% (Not available for humans) 99.5% Subsurface Water (soil, groundwater) 0.5% Surface Water (rivers, freshwater lakes) 0.02% Atmosphere 0.0001% If all land were flat, the oceans would cover it to a depth of 3 km If all atmospheric water were precipitated, it would cover the earth to a depth of 25 mm (1 inch) Holt, MO -- 12 inches of rain in 42 minutes! ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ GEOG 101 Chapter 4 Atmospheric Moisture and Precipitation 2 Atmospheric Humidity Humidity the amount of water vapor in the air When saturated, warm air contains more water vapor than cold air Thus, we erroneously say that warm air can hold more water vapor than cold air So, we would expect deserts near the poles due to the cold air temperatures ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ Atmospheric Humidity Relative Humidity the amount of water vapor in the air relative to the amount at saturation If air is saturated, we say that it has a relative humidity of 100% A relative humidity of 50% implies that the air has only half as much water vapor as it would have when saturated ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ ___________________________________ GEOG 101 Chapter 4 Atmospheric Moisture and Precipitation 3 Atmospheric Humidity Since at saturation, warm air contains more water vapor than cold air, relative humidity is inversely related to air temperature As air temperature rises and the amount of...
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This note was uploaded on 10/28/2009 for the course GEOG 101 taught by Professor Lavin during the Fall '08 term at University of Delaware.

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Chapter_4_notes - GEOG 101 Chapter 4 Atmospheric Moisture...

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