1. Antarctic Ozone Depletion

2. Average vertical temperature structure of atmosphere
FIGURE 1.11 Layers of the atmosphere as
related to the average profile of air temperature above
the earth’s surface. The heavy line illustrates how the
average temperature varies in each layer.

3. Ozone Measurement in Dobson Units (DUs)

11. Antarctic Ozone Seasonality

12. Sources of Stratospheric Chlorine
About 80% anthropogenic
About 20% natural
(but some natural HCl from
human-induced biomass
burning)
Based on early 1990s estimates (UNEP/WMO)