Lecture13_EAS1600_Fall08

Lecture13_EAS1600_Fall08 - EAS 1600 Introduction to...

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EAS 1600 Introduction to Environmental Sciences ____________________________ Lecture 13 Air Pollution and Climate ____________________________
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Background: Intro to Air Pollution Light + Water + Sulfur Dioxide (SO 2 ) Acidic PM PM = particulate matter also called ‘aerosols’ i.e. small liquid or solid particles suspended in the atmosphere. PM is primarily composed of sulfuric acid, water, and ammonia plus organic material often from coal-burning
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Background: Intro to Air Pollution The Most Obvious Indication of Smog: Haze And PM is responsible for this haze.
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Bejing August 1, 2007
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Bejing August 6, 2007 same camera, same view
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Particles are Visible PM : The visible component of smog From EPA Trends Report, 1998. All r values are in microns or micrometers
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Typically Divided Into: ¾ Ultra-fine particles ¾ (D < 0.1 μ m) ¾ Large or ‘Accumulation Mode’ Aerosol ¾ (0.1 μ m < D < 1 μ m) ¾ Giant or Coarse Aerosol ¾ (D > 1 μ m) Accumulation mode particles are so-called because of their tendency to accumulate in the atmosphere due to their relatively long lifetime. Ultrafine/Aitken nuclei are rapidly removed via coagulation onto larger particles because of their relatively high Brownian- motion velocities. Giant/coarse particles are rapidly removed via
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Lecture13_EAS1600_Fall08 - EAS 1600 Introduction to...

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