F2011GEOG1112WaterSecondLecture copy

# - 1 One More Big Drink of Water http/www.visualnarratives.com/pictures/ancient_mariner2 Water water everywhere And all the boards did shrink Water

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1 One More Big Drink of Water http://www.visualnarratives.com/pictures/ancient_mariner2.jpg “Water, water, everywhere And all the boards did shrink; Water, water, everywhere Nor any drop to drink.” Samuel Taylor Coleridge, The Rime of the Ancient Mariner (1797) S. T. Coleridge, Robert Downey Jr., Steve Harris, Iron Man of Poetry Iron Man of Movies Iron Maiden Bassist

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2 Absolute Measures of Water Vapor Vapor pressure: atmospheric pressure due ONLY to water vapor. Water vapor = 0-4% of atmosphere So vapor pressure = 0-4% of total atmospheric pressure And 0-4% of 1000 mb = 0-40 mb High vapor pressure = lots of water vapor in the air . Example above from relatively humid day in Athens (Test #1 day, Fall 2011). What’s the percent of water vapor in the air that day? Saturation vapor pressure: the vapor pressure in the case where the atmosphere has all the water vapor it can “hold.” Other absolute measures: mixing ratio, absolute & specific humidity (grams of water vapor/volume of air). Important for meteorologists, less so for ordinary citizens.
3 Dew Point: The Almost-Absolute, Very Useful Measure of Water Vapor What’s dew point? The temperature air must be cooled to, in order to become saturated . Examples: wet grass on fall mornings, water on the side of cold drink glass (left) If altitude doesn’t change, dew point is ~ absolute measure of water vapor in the air High dew point (~ 70°F): lots of water vapor in the air (If air can be cooled and water vapor condensed, tremendous energy release. Good for powering thunderstorms!) Low dew point (~ 20°F): little water vapor in the air

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## This note was uploaded on 09/09/2011 for the course GEOG 1112 taught by Professor Frye during the Spring '08 term at University of Georgia Athens.

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- 1 One More Big Drink of Water http/www.visualnarratives.com/pictures/ancient_mariner2 Water water everywhere And all the boards did shrink Water

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