Scientific Assessment of Ozone Depletion: 2010

The 2010 WMO/UNEP assessment, Scientific Assessment of Ozone Depletion: 2010, contains the most up-to-date understanding of ozone depletion. It reflects the thinking of hundreds of international scientific experts who contributed to its preparation and review. Cochairs of this Ozone Assessment were Dr. A.R. Ravishankara of the NOAA ESRL Chemical Sciences Division, Dr. Paul A. Newman of the NASA Goddard Space Flight Center, Dr. John A. Pyle of the University of Cambridge, and Dr. Ayité-Lô Nohende Ajavon of the Université de Lomé. Other members of the ESRL Chemical Sciences Division made substantial contributions to the report, serving as lead authors, co-authors, contributors, reviewers, coordinating editor, and editorial and computing support staff.

This Ozone Assessment consists of an Executive Summary, five detailed chapters, and Twenty Questions and Answers About the Ozone Layer: 2010 Update.

Contents

Preface

Prologue: State of the Science through the 2006 WMO/UNEP Assessment

Executive Summary

• Introduction
• Changes in Gases that Affect Stratospheric Ozone and Climate
  • Ozone-Depleting Substances and Substitutes: Tropospheric Abundances and Emissions
  • CFCs, HCFCs, HFCs, and Climate Change
  • Total Chlorine and Bromine and Implications for Ozone Depletion
  • Figure ES-1: Emissions of ODSs and Their Substitutes
• Ozone and Climate: Antarctic
• Ozone and Climate: Global and Arctic
  • Figure ES-2: Schematic of the Influence of Ozone-Depleting Substances and Climate Change on the Stratospheric Ozone Layer, and the Influence of Ozone Changes on Surface Ultraviolet Radiation
• Information for Policymakers and Options for Policy Formulation
  • Information for Policymakers
  • Options for Policy Formulation
    • Table ES-1: Hypothetical Cases

Scientific Summaries of the Chapters

• Chapter 1: Ozone-Depleting Substances (ODSs) and Related Chemicals
  • Figure S1-1: Stratospheric EESC Relative to Peak Abundances Versus Time
  • Table S1-1: Radiative Forcings of ODSs and Other Gases and Their Recent Changes
• Chapter 2: Stratospheric Ozone and Surface Ultraviolet Radiation
  • Table S2-1: Summary of Ozone Changes Estimated from Observations
• Chapter 3: Future Ozone and Its Impact on Surface UV
• Chapter 4: Stratospheric Changes and Climate
• Chapter 5: A Focus on Information and Options for Policymakers
  • Table S5-1: Summary of Hypothetical Cases for Accelerating the Recovery of the Ozone Layer and Reducing Carbon-Equivalent Emissions

Twenty Questions and Answers About the Ozone Layer: 2010 Update