may 14 - Outline • Gases to particles • Gas or...

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Unformatted text preview: Outline • Gases to particles • Gas or particle? • T and RH dependence • Examples of atmospheric aerosols – Dust + smoke • Sizes and modes • Formation processes • Size metrics • Chemistry vs. size • Lifetime • Environmental impacts 100% Particle Vapor pressure 100% Gas phase Aerosol = gas + particle High Low Boiling Point Low High Gases-Particles NH 3 NH 3 NH 3 NH 3 NH 3 NH 3 NH 3 NH 3 NH 3 NH 3 SO 2 SO 2 SO 2 SO 2 SO 2 SO 2 SO 2 SO 2 SO 2 SO 2 SO 2 SO 2 NH 4 + NH 4 + NH 4 + NH 4 + NH 4 + HSO 4- HSO 4- HSO 4- HSO 4- HSO 4- H 2 O H 2 O H 2 O H 2 O H 2 O H 2 O H 2 O HNO 3 HNO 3 HNO 3 HNO 3 HNO 3 HNO 3 HNO 3 HNO 3 HNO 3 NO 3- HNO 3 NO 3- NO 3- NO 3- NO 3- NO 3- Gas phase OC OC OC OC OC OC OC OC OC Particle H 2 O H 2 O H 2 O H 2 O H 2 O H 2 O Distribution of atmospheric species • Volatile—gas phase • Non-volatile—particle phase • Semivolatile—both phases • Distribution changes with temperature For a given ambient temperature as/particle distribution for polluted urban atmosphere Vapor Pressure Low High T and RH dependence...
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This note was uploaded on 10/28/2010 for the course CHEM 173 taught by Professor Dr.dancziczo during the Spring '10 term at UC Riverside.

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may 14 - Outline • Gases to particles • Gas or...

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