Atmospheric Aerosol

Atmospheric Aerosol - * sE 9/13/11 ENV 6130, Spring 2010...

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Unformatted text preview: * sE 9/13/11 ENV 6130, Spring 2010 Atmospheric Aerosols Jiaying Li 04/06/2010 9/13/11 11 ENV 6130, Spring 2010 9/13/11 ENV 6130, Spring 2010 Source Natural -- background aerosol Anthropogenic -- urban aerosol Size distribution three modes Life time Chemical composition Effects Global warming v.s. Whitehouse effects Atmospheric haze Precipitation 9/13/11 22 ENV 6130, Spring 2010 9/13/11 ENV 6130, Spring 2010 What is the largest and most important atmospheric aerosol? Clouds 9/13/11 33 ENV 6130, Spring 2010 9/13/11 ENV 6130, Spring 2010 Primary vs. Secondary Particles Mobile vs. Stationary Combustion vs. Noncombustion Outdoor vs. Indoor Natural vs. Anthropogenic Classification of Aerosol Sources 9/13/11 44 ENV 6130, Spring 2010 9/13/11 ENV 6130, Spring 2010 Natural Background Aerosol Natural Sources: volcano, sea salts, vegetation emission, forest fire, soil erosion, electrical storm, etc. http://desk.zol.com.cn/pic_292008.html http://tupian.hudong.com/a0_13_55_01300000201199122481551435311_jpg.html 9/13/11 55 ENV 6130, Spring 2010 9/13/11 ENV 6130, Spring 2010 Major volcanos can increase the stratospheric particulate concentration by two orders of magnitude. The Mount Pinatubo eruption in 1991 injected 14-20 Tg of SO2 into the stratosphere, causing the aerosol concentration to increase from 2-5 g/m3 to 20-100 g/m3. Before this eruption the particle size distribution had a CMD of 0.14m and a GSD of 1.6; after, it had a CMD of 0.66 m and a GSD of 1.5. The only significant anthropogenic source of particles in the stratosphere is soot from high-altitude aircraft. But this represents less than 1 percent of the total stratospheric aerosol. http://tupian.hudong.com/a0_13_55_01300 9/13/11 66 ENV 6130, Spring 2010 9/13/11 ENV 6130, Spring 2010 Over land, about 10 ion pairs (a positive and a negative ion) are formed in every cubic centimeter every second. These ions attach to aerosol particles and recombine with each other at a rate that yields an equilibrium concentration of small ions of 100- 5000/cm3 with an average value of 800/cm3. Most of the natural photochemical smog is formed by the action of sunlight on isoprene and monoterpene vapor emissions from trees. Total sea salt flux from ocean to atmosphere is estimated to be 3300 Tg/yr (IPCC). 9/13/11 77 ENV 6130, Spring 2010 9/13/11 ENV 6130, Spring 2010 Clean air?...
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This note was uploaded on 09/11/2011 for the course ENV 6130 taught by Professor Wu during the Spring '08 term at University of Florida.

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Atmospheric Aerosol - * sE 9/13/11 ENV 6130, Spring 2010...

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