atmos - Lecture12 AirPollution...

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Lecture 12
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Air Pollution Air pollutants come from a variety of sources: Human released – burning of fuels and other substances,  industrial wastes Naturally released – dust, volcanoes, seawater
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Air Pollution and Air Quality Like water, air can dilute pollutants Amount diluted depends on many factors: air characteristics – moving or stagnant, humidity topography – lay of the land type of pollutant and their behavior when released
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Urban areas often  suffer from  concentrated  pollution Emissions are high  from transportation  and industry Local conditions  can trap pollutants Urban Air Pollution
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Mexico City Microclimate
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Temperature Inversion Normally, air  temperature  decreases with  altitude Air near the ground  warms and rises Occasionally, an  inversion occurs: a  warm layer forms  above cold air This traps the  denser cold air  below
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Subsidence Inversion Descending air in high pressure system warms as it compresses Cold air trapped underneath Typically affects large areas – e.g. Eastern Seaboard of US
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Radiation Inversion In clear weather, ground radiates heat back into atmosphere Air near ground cools, atmosphere above remains warm e.g. Mexico City, Denver
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This note was uploaded on 10/16/2011 for the course GEOGRAPHY 211 taught by Professor Smith during the Spring '11 term at Rutgers.

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atmos - Lecture12 AirPollution...

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