aerosols - Atmospheric particles (aerosols) = small solid...

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Atmospheric particles (aerosols) = small solid or liquid particles suspended in air (1 nm - 100 μm) I. Chemical components A. SO 4 2- , NO 3 - , NH 4 + B. carbon: elemental carbon (soot); hydrocarbons; partially oxidized organic compounds (aldehydes, carboxylic acids) C. major (Si, Na, K, Fe, Ca, Al, Mg) and trace elements (As, Cd, Cu, Fe, Pb, V): -northeast U.S. regional (Vermont) fine aerosol composition (Polissar et al., 2001 ES&T 35:4604-4621) II. Sources of primary particulate matter to the atmosphere A. natural B. anthropogenic III. Formation of secondary aerosols from gases IV. Particle size distributions (Box 3-2, p.139-140) A. By number of particles: 0.01 μm – nuclei mode 0.1 μm – accumulation mode 1 μm – coarse mode B. By residence time: 0.01 μm – 30 min 0.1 μm – 2 days 1 μm – 10 days 10 μm – 1 day 100 μm – 30 min C. By volume/mass of particles:
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1. fine particles (PM2.5): < 2.5 μm, direct emissions or chemical formation in the atmosphere (gas to particle conversions)
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This note was uploaded on 10/25/2011 for the course ENVSCI 202 taught by Professor Staff during the Spring '11 term at Rutgers.

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aerosols - Atmospheric particles (aerosols) = small solid...

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