Chapter05a - Dew Frost and Fog RECAP Hydrologicalcycle: Humidity:absolutehumidity,specifichumidity,watermixingratio relativehumidity

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Dew, Frost and Fog
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RECAP Hydrological cycle : transport of water and energy. Humidity : absolute humidity, specific humidity, water mixing ratio,  relative humidity. Saturation pressure : the maximum vapor pressure at a given T. Dew point : the temperature to which air would have to be cooled in  order to get saturated. The effect of large water bodies on the humidity of a climate (Florida/ California). The effect of cooling/heating systems on the humidity in the house. Heat index : what the air temperature “feels like” to the average person  for different combinations of temperature and  relative humidity
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Condensation As air cools, it becomes first saturated and then  supersaturated -> condensation/deposition Condensation requires some initiator surface (dew, frost) nuclei (haze, fog, clouds) Classification of condensation nuclei according  to size (not important) properties hygroscopic: “water-seeking”,  condensation at RH<100% hydrophobic: “water-repelling”,  condensation at RH>100%. unsaturated Super- saturated saturated
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Dew Condensation of water vapor on cool surfaces. Usually forms at ground level (air is coldest there). Frozen dew: air temperature drops below zero after dew has formed Atmospheric conditions: clear, calm nights. Clear air: the ground emits IR radiation to space. There are
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This note was uploaded on 05/29/2011 for the course MET 1010 taught by Professor Matchev during the Spring '08 term at University of Florida.

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Chapter05a - Dew Frost and Fog RECAP Hydrologicalcycle: Humidity:absolutehumidity,specifichumidity,watermixingratio relativehumidity

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