Scientific Assessment of Ozone Depletion: 2002

The 2002 WMO/UNEP assessment, Scientific Assessment of Ozone Depletion: 2002, contains the most up-to-date understanding of ozone depletion at the time and reflects the thinking of 275 international scientific experts who contributed to its preparation and review. Co-chairs of the Assessment were Dr. Daniel L. Albritton of the NOAA Aeronomy Laboratory, Dr. Ayité-Lô Nohende Ajavon of the Université de Lomé, Dr. Gérard Mégie of the Centre National de la Recherche Scientifique, and Dr. Robert T. Watson of the World Bank. Other members of the Aeronomy Laboratory made substantial contributions to the report, serving as lead authors, co-authors, contributors, reviewers, coordinating editor, and editorial and computing support staff.

The Assessment consists of the Executive Summary, five detailed chapters and "Twenty Questions and Answers About the Ozone Layer", listed with the names of the Lead Authors:

Chapter 1. Controlled Substances and Other Source Gases Stephen A. Montzka and Paul J. Fraser

Chapter 2. Very Short-Lived Halogen and Sulfur Substances Malcolm K.W. Ko and Gilles Poulet

Chapter 3. Polar Stratospheric Ozone: Past and Future Paul A. Newman and John A. Pyle

Chapter 4. Global Ozone: Past and Future Martyn P. Chipperfield and William J. Randel

Chapter 5. Surface Ultraviolet Radiation: Past and Future James B. Kerr and Gunther Seckmeyer

Twenty Questions and Answers About the Ozone Layer David W. Fahey

Text of the Executive Summary

A full formatted copy of the Executive Summary PDF file
The Executive Summary gives a synopsis of major scientific findings of the five chapters of the full 2002 Assessment. This includes:

"Twenty Questions and Answers About the Ozone Layer"

In the 2002 Assessment, the international scientific community included this section to answer several of the general questions that are most frequently asked by students, the general public, and leaders in industry and government. A draft of this component of the 2002 Assessment was reviewed and discussed by the 74 scientists who attended the Panel Review Meeting PDF file for the 2002 report in June 2002. In addition, subsequent contributions, reviews, or comments were made by individuals listed on the publication's inside cover PDF file.

A full formatted copy of the "Twenty Questions and Answers About the Ozone Layer" PDF file
Individual components, including each question and associated figures:


    1. What is ozone and where is it in the atmosphere?
    2. How is ozone formed in the atmosphere?
    3. Why do we care about atmospheric ozone?
    4. Is total ozone uniform over the globe?
    5. How is ozone measured in the atmosphere?
    1. What are the principal steps in stratospheric ozone depletion caused by human activities?
    2. What emissions from human activities lead to ozone depletion?
    3. What are the reactive halogen gases that destroy stratospheric ozone?
    4. What are the chlorine and bromine reactions that destroy stratospheric ozone?
    5. Why has an "ozone hole" appeared over Antarctica when ozone-depleting gases are present throughout the stratosphere?
    1. How severe is the depletion of the Antarctic ozone layer?
    2. Is there depletion of the Arctic ozone layer?
    3. How large is the depletion of the global ozone layer?
    4. Do changes in the Sun and volcanic eruptions affect the ozone layer?
    1. Are there regulations on the production of ozone-depleting gases?
    2. Has the Montreal Protocol been successful in reducing ozone-depleting gases in the atmosphere?
    1. Does depletion of the ozone layer increase ground-level ultraviolet radiation?
    2. Is depletion of the ozone layer the principal cause of climate change?
    1. How will recovery of the ozone layer be detected?
    2. When is the ozone layer expected to recover?


List of International Authors, Contributors, and Reviewers of the 2002 Assessment

Hundreds of scientists from around the world write and review the periodic WMO/UNEP "state-of-the-science" assessments of ozone depletion; hundreds of additional scientists author the studies that are referenced within them. As a result, the WMO/UNEP assessments are truly "global" documents, reflecting the thinking of the international scientific community.

275 international scientists from the developed and developing world contributed to the preparation and review of the latest WMO/UNEP assessment, Scientific Assessment of Ozone Depletion: 2002. Listed are the names of those individuals and the supporting organizations and staff.