"Lec 32 - The Ozone Layer" The Atmosphere, the Ocean and Environmental Change (GG 140) Stratospheric ozone is important as protection from harmful ultraviolet solar radiation. Ozone in the stratosphere blocks almost all UVC radiation, which is extremely energetic and harmful. Ozone within the ozone layer is destroyed through chemical reactions involving chlorine atoms and the ozone molecules. The main anthropogenic source of chlorine in the atmosphere is chlorofluorocarbons (CFCs). Emissions of CFCs began to increase after 1960 and continued to increase until the 1990s. The 1987 Montreal Protocol banned the emission of CFCs as of 1994, and currently CFC emissions are nearly zero. 00:00 - Chapter 1. Terminology for Stratospheric Ozone 00:01 - Chapter 2. The Ozone Layer 11:06 - Chapter 3. The Dobson Unit 15:05 - Chapter 4. Origin and Maintenance of Ozone in the Stratosphere 26:22 - Chapter 5. The Ozone Hole 37:51 - Chapter 6. The Montreal Protocol Complete course materials are available at the Open Yale Courses website: http://oyc.yale.edu This course was recorded in Fall 2011.
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Lec 1 - Introduction to Atmospheres
Lec 2 - Retaining an Atmosphere
Lec 4 - Vertical Structure of the atmosphere; Residence Time
Lec 5 - Earth Systems Analysis (Tank Experiment)
Lec 6 - Greenhouse Effect, Habitability
Lec 9 - Water in the Atmosphere I
Lec 10 - Water in the Atmosphere II
Lec 11 - Clouds and Precipitation (cloud chamber experiment)
Lec 12 - Circulation of the Atmosphere (Exam I review)
Lec 13 - Global Climate and the Coriolis Force
Lec 14 - Coriolis Force and Storms
Lec 18 - Seasons and Climate Classification
Lec 19 - Ocean Bathymetry and Water Properties
Lec 20 - Ocean Water Density and Atmospheric Forcing
Lec 22 - Ocean Currents and Productivity
Lec 24 - Ice in the Climate System
Lec 25 - Ice and climate change
Lec 26 - Isotope Evidence for Climate Change
Lec 28 - Global Warming (continued)
Lec 29 - Global Warming (continued)
Lec 30 - Climate Sensitivity and Human Population
Lec 31 - The Two Ozone Problems
Lec 33 - Energy Resources, Renewable Energy