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Record 1 of 480
Detecting the Recovery of the Antarctic Ozone Hole
Author and Affiliation:
Newman, Paul A.(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Nash, Eric R.(Science Systems and Applications, Inc., Landover, MD, United States)
Kawa, S. Randolph(NASA Goddard Space Flight Center, Greenbelt, MD, United States)
Montzka, Steve(National Oceanic and Atmospheric Administraion)
Abstract: The Antarctic ozone hole develops each year and culminates by early Spring. Antarctic ozone values have been monitored since 1979 using satellite observations from the TOMS instrument. The severity of the hole has been assessed from TOMS using the minimum total ozone value from the October monthly mean (depth of the hole) and by calculating the average size during the September-October period. Ozone is mainly destroyed by halogen catalytic cycles, and these losses are modulated by temperature variations in the collar of the polar lower stratospheric vortex. In this presentation, we show the relationships of halogens and temperature to both the size and depth of the hole. Because atmospheric halogen levels are responding to international agreements that limit or phase out production, the amount of halogens in the stratosphere should decrease over the next few decades. Using projections of halogen levels combined with age-of-air estimates, we find that the ozone hole is recovering at an extremely slow rate and that large ozone holes will regularly recur over the next 2 decades. We will show estimates of both when the ozone hole will begin to show first signs of recovery, and when the hole will fully recover to pre-1980 levels.
Publication Date: Dec 01, 2004
Document ID:
20040182463
(Acquired Dec 13, 2004)
Subject Category: ENVIRONMENT POLLUTION
Document Type: Preprint
Meeting Information: 2004 Fall American Geophysical Union Meeting; 13-17 Dec. 2004; San Francisco, CA; United States
Meeting Sponsor: American Geophysical Union; Washington, DC, United States
Financial Sponsor: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Organization Source: NASA Goddard Space Flight Center; Greenbelt, MD, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: No Copyright
NASA Terms: ANTARCTIC REGIONS; DETECTION; OZONE DEPLETION; AIR POLLUTION; SATELLITE OBSERVATION; STRATOSPHERE; TOTAL OZONE MAPPING SPECTROMETER; HALOGENS
Availability Source: Other Sources
Availability Notes: Abstract Only
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