1 -- INTRODUCTION

1.1 Discussion Objectives

2 -- LIFE CYCLE OF AN OZONE MOLECULE: BASIC PHOTOCHEMISTRY

2.1 Chapman Cycle for Ozone Production

2.2 Chapman Cycle for Ozone Loss

      2.2.1 Beyond the Chapman Cycle: Additional Chemical and Transport Processes

3 -- OZONE UV RADIATION SHIELDING AND PHOTOLYSIS

3.1 The Concept of Absorption Cross-Section

3.2 Ozone Shielding of UV Radiation From the Surface

3.3 Ozone Photolysis

      3.3.1 Ozone Photolysis: Dependence on Altitude

      3.3.2 Ozone Photolysis: Dependence on Latitude

      3.3.3 Ozone Photolysis: Seasonal Dependence

      3.3.4 Ozone Photolysis: Diurnal Dependence

3.4 Lifetimes of Odd Oxygen Molecules

      3.4.1 Ox Partitioning 4 -- CATALYTIC LOSS AND LIFE CYCLE OF FAMILIES

4.1 Chapman Chemistry

4.2 Catalytic Loss (Gas Phase)

      4.2.1 Hydrogen Catalytic Loss

      4.2.2 Methane Photodissociation Reactions

      4.2.3 HOx Catalytic Cycles

      4.2.4 NOx Catalytic Cycles

      4.2.5 Temperature Dependence of NOx Catalytic Reactions

      4.2.6 Interference Cycles

      4.2.7 Chlorine Sources

      4.2.8 Clx Catalytic Reactions

      4.2.9 Clx Catalytic Reactions and the Antarctic Ozone Hole

      4.2.10 Bromine Sources

      4.2.11 Brx Catalytic Reactions

5 -- HETEROGENEOUS CHEMISTRY

5.1 Introduction

5.2 Stratospheric Particles

      5.2.1 Sulfate Aerosols

      5.2.2 Polar Stratospheric Clouds (PSCs)

5.3 Heterogeneous Reactions

      5.3.1 Destruction of Ozone Via the ClO-ClO Reaction

      5.3.2 Chlorine and Nitrogen Activation/Deactivation

SUMMARY

REVIEW QUESTIONS