ENVR 200 Lecture Notes - Lecture 24: Tropospheric Ozone, Trichlorofluoromethane, Ozone Depletion

• School: McGill University
• Department: Environment
• Course: ENVR 200
• Professor: George Mc Court

Document Summary

Not wanted near ground level because it is harmful to organisms. O2 is split into o then combined with another o2 to create o3. Ozone can be destroyed in the opposite reaction. React with uv light in the stratosphere to form cl. Ozone can be destroyed more easily in liquids or solids. Extremely cold antarctic conditions form stratospheric ice clouds and sulphuric acid. No light in the winter means there is no reaction. Light returning in the summer rapidly destroys ozone, creating the ozone hole . The ozone hole vanishes as temperature warms and circumpolar circulation dissolves. Cfcs have been phased out through binding international agreements. International recognition of a problem with observable effects (skin cancer)