Why Does The Ozone Hole Form?
Module written by Tricia Ferrett and Sharon Anthony
Quicktime Movies by G. C. Lisensky and S. C. Thorp
Session 1: Why worry about the ozone hole?
Introduction, data analysis, scientific argumentation, Web research skills, UV spectroscopy and experimental design
Exploration 1A: When did the ozone hole form?
Exploration 1B: Why should ozone scientists communicate with the public?
Exploration 1C: Is ozone decreasing in other parts of the world?
Exploration 1D: What else would you like to know?
Exploration 1E: Why do we need ozone?
Session 2: Does oxygen chemistry explain the ozone hole?
Chemical mechanisms, rate laws and calculations, experimenal rate laws, evaluating a model
Exploration 2A: How is ozone made & destroyed?
Exploration 2B: Why is less ozone produced in the troposphere than in the
Exploration 2C: Which oxygen reaction dominates ozone destruction?
Exploration 2D: How do we measure reaction rates?
Looking Back: Does oxygen chemistry explain the ozone hole?
Thinking Further: How does UV light vary with altitude?
Session 3: Does gaseous chlorine chemistry explain the
Cause and effect relationships, reaction coordinate diagrams, catalysis, activation energy, Arrhenius theory, atmospheric transport, evaluating a model
Exploration 3A: Why worry about chlorine?
Exploration 3B: Why is chlorine an efficient ozone destroyer?
Exploration 3C: How does chlorine get to the polar stratosphere?
Exploration 3D: Does gaseous chlorine chemistry explain the ozone hole?
Session 4: Why have we replaced CFCs?
Solubility, acid/base and reactive properties of refrigerant gases, atmospheric gas transport & photochemistry, international CFC treaties, CFC replacement gases, C-F and C-H bond chemistry
Exploration 4A: Why were CFCs once wonder chemicals?
Exploration 4B: Are CFC regulations adequate?
Exploration 4C: Why are CFC replacements better?
Session 5: How Is Antarctic Ozone Chemistry Unique?
Heterogeneous cloud chemistry, Antarctic catalytic cycles
Session 6: Why Does The Ozone Hole Form in the Antarctic
Written responses to ozone arguments, applying chemical kinetics to the ozone hole, teaching others about the ozone hole
Project 1: Supporting a scientific argument with evidence
Project 2: Chemical reaction rates & the ozone hole
Project 3: Teaching the community about ozone.