HR: 1340h
AN: A13D-0964    [Abstracts]
TI: The influence of loss saturation effects on the assessment of polar ozone changes
AU: Cunnold, D M
EM: cunnold@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332 United States
AU: * Yang, E
EM: yes@eas.gatech.edu
AF: Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332 United States
AU: Salawitch, R J
EM: rjs@caesar.jpl.nasa.gov
AF: Jet Propulsion Laboratory, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Newchurch, M J
EM: mike@nsstc.uah.edu
AF: University of Alabama in Huntsville, 320 Sparkman Drive, Huntsville, AL 35805 United States
AB: Newman et al. (2004) have shown that the maximum area of ozone depletion in the Antarctic vortex, after accounting for year to year temperature changes, has been constant since approximately 2000. Yang et al. (2005) have derived a similar result by considering the year to year ozone changes at 60-70S. The frequency distribution of ozone values in this latitude region from SAGE, HALOE and ozonesonde measurements in Septembers and Octobers in recent years are compared against the distributions measured by SAGE about 15 years ago. This comparison indicates that the saturation of ozone loss (e.g., occurrence of near-zero values) has played only a minor role in the lack of ozone changes in recent years. Hence, the recent leveling off of ozone is likely due to near constant chlorine and bromine loading. Additional analysis of the 60-70S behavior using an equivalent latitude approach is presented and the results are compared against the springtime behavior in the 60-70N region.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0340 Middle atmosphere: composition and chemistry
DE: 0341 Middle atmosphere: constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005