04humidity.big

04humidity.big - Ch. 4: Humidity Hydrologic Cycle...

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1 Ch. 4: Humidity • Hydrologic Cycle • Saturation • Humidity Vapor Pressure Relative Humidity Dew Point Temperature • Heat Index • Measurement of Humidity
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2 • Condensation Dew and Frost Condensation Nuclei Haze and Fogs • Haze • Radiation Fog • Advection Fog • Evaporation Fog
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3 Hydrologic Cycle Land Ocean Evaporation Condensation Precipitation Precipitation Runoff
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4 Basic Concepts • Evaporation: Adds vapor to the air • Condensation: Removes vapor from the air • Case: liquid water inside a closed container with no air. Water begins to evaporate into the air space. . .
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5 Saturation of Air With Water Vapor Subsaturation Evaporation rate > Condensation rate Net evaporation
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6 Saturation of Air With Water Vapor Saturation Evaporation rate = Condensation rate Equilibrium
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7 Vapor Pressure (e) Unit of pressure: millibar (mb) = 0.001 bar N 2 O 2 H 2 O Total: 1000 mb 780 mb 210 mb 10 mb Dalton’s Law: The total pressure exerted by a mixture of gases is the sum of the partial pressures of each gas
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04humidity.big - Ch. 4: Humidity Hydrologic Cycle...

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