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Rainwater_and_Aerosols_-_Lect05_S10

Rainwater_and_Aerosols_-_Lect05_S10 - Rainwater and...

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1 Rainwater and Aerosols Advanced Environmental Geochemistry – Lecture 5 Spring 2010
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Condensation Condensation results from nucleation of water droplets, from two sources: Homogeneous nucleation Nucleation on a foreign substance 2
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Natural Nucleators Mineral and salt dusts from terrestrial sources Volcanic smoke and dust Smoke from forest fires Meteoric dust Salt spray from oceans In-situ particles formed by chemical reactions 3
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Anthropogenic Nucleators Particulates from combustion Materials handling Loading and unloading sand, gravel, etc. Crushing and grinding of ores Fertilizer production and packaging Cutting and forming of wood products, wallboard, plastics and many similar sources 4
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Size of Particles Giant (> 1 micron) Large (0.1 to 1 micron) Aitken ( < 0.1 micron) 5
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Aerosol Particulate Distributions Background Purest air – less than 700 particles per cm 3 Typical particle size is about 0.2 microns Ocean Sea-spray particulates in the 0.5 to 20 micron range added to the background Continental Particle density of 10 4 /cm 3 in rural areas, 10 5 in polluted urban areas 6
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