moisture clouds precip

moisture clouds precip - Environmental Lapse Rate = the...

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Unformatted text preview: 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 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: sat e T T T ( ) . exp( . . ) = + 611 17 3 23 73 where T is in C and e sat is in mb Exp is exponentialexp(x) is he same as e x where e in this case is the natural log Saturation vapor pressure is slightly less over ice 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)Rv is gas constant for water vapor (4....
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This note was uploaded on 05/04/2008 for the course EAES 101 taught by Professor Doran during the Spring '08 term at Ill. Chicago.

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moisture clouds precip - Environmental Lapse Rate = the...

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