Lecture13_Aerosols

Lecture13_Aerosols - EAS 1600 Introduction to Environmental...

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EAS 1600 Introduction to Environmental Sciences ____________________________ Class12- Air Pollution Meets Global Climate Change ____________________________ Before we leave the atmosphere, we take a look at one more subject of relevance to climate and climate change: The Link Between Air Pollution and Global Climate Change Background: Intro to Air Pollution Background: Intro to Air Pollution
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Background: Intro to Air Pollution The 3 Flavors of Smog London smog [historic] Biomass-burning smog [prehistoric, historic, modern] Photochemical smog [modern] Background: Intro to Air Pollution SMOG : Not great for the lungs Historical Smog ¾ 4000 die in London smog of 1952. Photochemical Smog ¾ ~60,000 CPD- related deaths in U.S. Biomass-Burning Smog ¾ Indonesian fires of 1997/98 caused 100’s of deaths, ~15,000 hospitalizations. Background: Intro to Air Pollution London Smog Fog + Smoke + Sulfur Dioxide Acidic PM PM = particulate matter = also called ‘aerosols’ (we’ll talk more about PM later) often from coal-burning Background: Intro to Air Pollution Lower Atmosphere VOC + NO x + Sunlight = Ozone + PM Modern-Day Smog Produced From Photochemical Reactions PM = particulate matter that’s why its called “photochemical smog” mostly from fossil-fuel burning
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Sources of VOC and NO X •VOC – Unburned gasoline and similar fuels • Controls: Catalytic Converters – Trees: Isoprene and α -Pinene •NO X –N 2 + O 2 + ? 2 NO Background: Intro to Air Pollution 10 100 1,000 10,000 1 2 3 5 10 20 30 50 Ozone (ppbv) Altitude (km) Atmospheric Ozone = O 3 (The Good, The Bad , and The Ugly ) Stratospheric O 3 protects life from harmful effects of UV radiation from sun. Upper tropospheric O 3 is an effective Greenhouse Gas. Increases in concentrations may have already had significant climatic impact. Ground-level O 3 reacts with living tissue. Concentrations above 50-70 ppbv decrease net productivity of crops, trees etc. U.S. NAAQS (i.e., health standard) is ??? { 120 ppbv for one hour
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This note was uploaded on 04/18/2008 for the course EAS 1600 taught by Professor Jimstjohn during the Spring '08 term at Georgia Tech.

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Lecture13_Aerosols - EAS 1600 Introduction to Environmental...

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