CHEM 2610 Lecture 9: Atmospheric Aerosols - Rain, Snow and Fog
26 Dec 2015
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Document Summary
Week 9 - atmospheric aerosols: rain, snow and fog. Formation of ozone in stratosphere and troposphere (photolytic cycle with respects to no 2) Play an important role in the reactions that occur in the troposphere and stratosphere. Acts as heterogeneous catalysts that can change the rates of chemical reactions. Most common are water droplets or ice crystals. D: dewpoint: the temperature to which the air would have to be cooled in order for the saturation to occur. Homogeneous condensation of supersaturated water vapor into water droplets, in dust free air. Heterogeneous condensation of supersaturated water vapor on solid particles (sea salt, dust) or individual ions (na+, cl-, nh4. Saturation levels affect frequency of precipitation and size of water droplets. Solid or liquid particles suspended in the air. Condensation aerosols - clouds, fog, sulfate and nitrate (smog) 0. 01 m < x < 1 m - suspended for long periods of time. Aerosol particles possess large surface to volume ratio.
