The Arctic Ozone Layer How the Arctic Ozone Layer is Responding to Ozone-Depleting Chemicals and Climate Change Photographs are the property of the EC ARQX picture archive. Special permission was obtained from Mike Harwood (p. vii: Muskoxen on Ellesmere Island), Richard Mittermeier (pp. vii, 12: Sunset from the Polar Environment Atmospheric Research Laboratory), Angus Fergusson (p. 4: Iqaluit; p. 8: Baffin Island), Yukio Makino (p. vii: Instrumentation and scientist on top of the Polar Environment Atmospheric Research Laboratory), Tomohiro Nagai (p. 25: Figure 20), and John Bird (p. 30: Polar Environment Atmospheric Research Laboratory). To obtain additional copies of this report, write to: Angus Fergusson Science Assessments Section Science & Technology Integration Division Environment Canada 4905 Dufferin Street Toronto ON M3H 5T4 Canada Please send feedback, comments and suggestions to
[email protected] © Her Majesty the Queen in Right of Canada, represented by the Minister of the Environment, 2010. Catalogue No.: En164-18/2010E ISBN: 978-1-100-10787-5 Aussi disponible en français The Arctic Ozone Layer How the Arctic Ozone Layer is Responding to Ozone-Depleting Chemicals and Climate Change by Angus Fergusson Acknowledgements The author wishes to thank David Wardle, Ted Shepherd, Norm McFarlane, Nathan Gillett, John Scinocca, Darrell Piekarz, Ed Hare, Elizabeth Bush, Jacinthe Lacroix and Hans Fast for their valuable advice and assistance during the preparation of this manuscript. i Contents Summary ....................................................................................................................................................