Ozone hole looms large, but not as big as it was

Commonwealth of Australia  Bureau of Meteorology

26 September 2007

MEDIA RELEASE

The Antarctic ozone hole is back and although it’s almost as big as previous years, the long term outlook for a return to better ozone levels remains good.

Over the past ten years the destruction of ozone has resulted in large ozone holes appearing over the Antarctic each spring with almost all growing to an area of more than 25 million square kilometres (about three times the size of Australia). This year, the Bureau of Meteorology reports that the hole has already reached that size but has not grown as large as the record 28 million square kilometre holes that developed during 2000, 2003 and 2006.

Ozone holes develop during spring because sunlight returning to the polar regions trigger chemical reactions that have remained dormant during the darkness of winter. The size and depth of the hole is determined by factors including the concentrations of ozone-depleting chemicals such as Chlorofluorocarbons (CFCs), as well as the temperature of the lower stratosphere. It is also influenced by broad scale atmospheric circulation patterns which vary significantly from year to year.

Though recent Antarctic ozone holes have been very large, measurements show that the concentrations of ozone-depleting substances in the lower atmosphere, such as CFCs, have peaked and are now slowly declining. In its most recent assessment of ozone depletion, compiled last year, the World Meteorological Organization stated that ozone levels are expected to return to pre-ozone-hole conditions between 2060 and 2075.

More information is available from the World Meteorological Organization:
http://www.wmo.ch/pages/prog/arep/documents/ant-bulletin-2-2007.pdf
http://www.wmo.int/pages/prog/arep/gaw/ozone_2006/ozone_asst_report.html

Further information:
Dr Matt Tully, Leader Ozone Science Team, Bureau of Meteorology
(03) 9669 4139, mob: 0431 638 060
Media assistance:
David Grant, Media Relations Adviser, Bureau of Meteorology, mob: 0439 452 424

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• 24 April 2008 Ozone Hole Recovery May Reshape Southern Hemisphere Climate Change

• 7 April 2008-Nuclear Conflict Would Create Near-Global Ozone Hole

• 8 March 2008 -Stratospheric ozone  and atmospheric airflow patterns

• 27 January 2008-Ozone hole discoverer issues another global warning

• 1 November 2007-Antarctic Ozone Hole Returns to Near Average Levels

• 3 October 2007 -The “ozone hole” is not shrinking

Data compiled from The British Antarctic Study, NASA, Environment Canada, UNEP, NOAA, USEPA and other sources as stated and credited 

Updated Daily-Researched By Charles Welch- 

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