GG140: The Atmosphere, The Ocean, and Environmental Change
Lecture 32 - The Ozone Layer. 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.
(from oyc.yale.edu)
| Lecture 32 - The Ozone Layer |
| Time | Lecture Chapters |
| [00:00:00] | 1. Ozone in the Atmosphere |
| [00:01:09] | 2. Terminology for Stratospheric Ozone |
| [00:01:42] | 3. The Ozone Layer |
| [00:11:06] | 4. The Dobson Unit |
| [00:15:05] | 5. Origin and Maintenance of Ozone in the Stratosphere |
| [00:26:22] | 6. The Ozone Hole |
| [00:37:51] | 7. The Montreal Protocol |
| References |
| Lecture 32 - The Ozone Layer Instructor: Professor Ronald B Smith. Resources: Credit List [PDF]. Transcript [html]. Audio [mp3]. Download Video [mov]. |
Go to the Course Home or watch other lectures: