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moisture clouds precip

moisture clouds precip - Moisture Precipitation Clouds...

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Environmental Lapse Rate = the temperature profile in the troposphere (varies) - about 6.5 ° C/km - measured Dry Adiabatic Lapse rate = rate a dry parcel of air cools when forced upward - ca. 10 ° C/km Wet (moist) adiabatic lapse rate = rate a parcel of air cools when forced upward after reaching the dew point - ca. 5 ° C/km - varies according to how much moisture in air Moisture, Precipitation, Clouds
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Precipitation Definitions: Vapor pressure - through motion and collisions every gas exerts pressure, called a partial pressure - when we sum all the partial pressures we arrive at the atmospheric pressure - the partial pressure exerted by water vapor is called the vapor pressure (e) - saturation vapor pressure (e sat ) is the maximum vapor pressure that is thermodynamically stable and is related solely to temperature: s a t e T T T ( ) . e x p ( . . ) = + 6 1 1 1 7 3 2 3 7 3 where T is in °C and e sat is in mb Exp is “exponential”…exp(x) is he same as e x where e in this case is the natural log
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Saturation vapor pressure is slightly less over ice
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Absolute Humidity (also vapor density) in g/m3 where T a is temperature in Kelvin Rv is gas constant for water vapor (4.63x10-3)
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