AOSC200Lect7

AOSC200Lect7 - AOSC 200 Lesson 7 MOISTURE WATER VAPOR...

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AOSC 200 Lesson 7
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MOISTURE •WATER VAPOR CONSTITUTES ONLY A SMALL FRACTION OF THE ATMOSPHERE. •VARIES FROM 0 TO 4 PER CENT •HOWEVER WATER IS PROBABLY THE MOST IMPORTANT GAS IN THE ATMOSPHERE FOR UNDERSTANDING ATMOSPHERIC PROCESSES. THE SOURCE OF ATMOSPHERIC WATER IS EVAPORATION
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p. 83 Satellite picture of clouds over North America, early January, 1998 Yellow and red in this picture are clouds which covered Canada. These clouds produced freezing rain and produced up to 4 inches of ice Extensive damage was done to transmission lines.
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p. 83 Crumpled steel electrical transmission towers – Canada, Jan. 1998
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Fig. 4-1, p. 84 Sequence of events leading to saturation of water vapor in air
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Fig. 4-3, p. 87 Observations of vapor pressure as a function of temperature
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Fig. 4-5, p. 83
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HUMIDITY HUMIDITY DESCRIBES THE AMOUNT OF WATER VAPOR IN THE AIR. HUMIDITY IS DESCRIBED QUANTITATIVELY AS, ABSOLUTE HUMIDITY, MIXING RATIO AND RELATIVE HUMIDITY SATURATION IS ACHIEVED WHEN THE NUMBER OF WATER VAPOR MOLECULES LEAVING A WATER SURFACE IS EQUAL TO THE NUMBER RETURNING FROM THE ATMOSPHERE TO THE WATER SURFACE. SATURATION VAPOR PRESSURE IS THE PRESSURE EXERTED BY THE WATER VAPOR AT SATURATION. ABSOLUTE HUMIDITY IS THE MASS OF WATER PER UNIT VOLUME . UNITS ARE USUALLY GRAMS PER CUBIC METER. MIXING RATIO IS THE MASS OF WATER VAPOR IN AN UNIT MASS OF AIR. USUALLY EXPRESSED IN GRAMS PER KILOGRAM. RELATIVE HUMIDITY IS THE ACTUAL AMOUNT OF WATER
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AOSC200Lect7 - AOSC 200 Lesson 7 MOISTURE WATER VAPOR...

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