Natural_Depletion_and_Current_Status_S11

Natural_Depletion_and_Current_Status_S11 - OZONE LAYER:...

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1 OZONE LAYER: NATURAL DEPLETION AND CURRENT STATUS GLY 4240 - Lecture 7 Spring, 2011
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2 1997 Montserrat Eruption
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3 Sulfur Dioxide Conversion
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4 Aerosol Optical Depth Analyses BRW is Pt. Barrow, Alaska MLO is Mauna Loa, Hawaii
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5 Pinatubo Aerosol Decay
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6 Surface Catalysis
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7 1998 Prediction Observed (solid lines, Cape Grim data) and predicted (dashed lines, Montreal Protocol) cumulative atmospheric concentrations (ppb effective chlorine) of CFCs, chlorinated solvents, HCFCs and halons
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Atmospheric Chlorine Levels Chlorine and bromine levels are starting to decrease 8
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9 Ozone Hole Data, 1998 - 2010
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10 2003 Southern Hemisphere Observations Ozone hole reached maximum size of greater than 27 million km 2 , with an average size in September of 25.8 million km 2 , larger than for any previous year South Pole total ozone minimum value was 106 Dobson Units Warming over Antarctica in early October limited further severe ozone destruction and limited the extent and duration of the ozone hole in 2003
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Ozone Depleting Gas Concentrations 11
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12
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Natural_Depletion_and_Current_Status_S11 - OZONE LAYER:...

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