Lecture14_Aerosols (1) - EAS 1600 Introduction to...

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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 nd Global Climate Change 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 ondon smog London smog [historic] Biomass-burning smog [prehistoric, historic, modern] hotochemical smog Photochemical smog [modern] Background: Intro to Air Pollution SMOG : Not great for the lungs Historical Smog 000 die in Photochemical 4000 die in London smog of 1952. Smog ~60,000 CPD- lated deaths in Biomass-Burning mog related deaths in U.S. Smog Indonesian fires of 1997/98 caused 100’s of deaths, ~15,000 hospitalizations. Background: Intro to Air Pollution London Smog often from al urning Fog + Smoke + Sulfur Dioxide Acidic PM coal-burning PM = particulate matter = also called ‘aerosols’ (we’ll talk more about PM later) Background: Intro to Air Pollution Modern-Day Smog roduced From Photochemical Reactions Produced From Photochemical Reactions that’s why its called “photochemical smog” Lower Atmosphere mostly from fossil-fuel burning VOC + NO x + Sunlight = Ozone + PM PM = particulate matter
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Sources of VOC and NO X • VOC nburned gasoline and similar fuels Unburned gasoline and similar fuels • Controls: Catalytic Converters – Trees: Isoprene and -Pinene p •NO X O 2NO – N 2 + O 2 + 2 NO Background: Intro to Air Pollution Atmospheric Ozone = O 3 h G d h B d d h U l 50 Altitude (km) (The Good, The Bad , and The Ugly ) Stratospheric O 3 protects life from harmful effects 20 30 of UV radiation from sun. Upper tropospheric O is an 5 10 3 effective Greenhouse Gas. Increases in concentrations may have already had significant climatic impact. 2 3 Ground-level O 3 reacts with living tissue. Concentrations above 50-70 ppbv decrease net productivity of rops trees etc U S NAAQS (i e 10 100 1,000 10,000 1 Ozone (ppbv) crops, trees etc. U.S. NAAQS (i.e., health standard) is ??? { 120 ppbv for one hour } { 80 ppbv for eight hours } Background: Intro to Air Pollution The Most Obvious Indication of Smog: Haze And PM is responsible for this haze.
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This note was uploaded on 02/15/2012 for the course EAS 1601 taught by Professor Lynch during the Spring '08 term at Georgia Institute of Technology.

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Lecture14_Aerosols (1) - EAS 1600 Introduction to...

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