HR: 10:25h
AN: A22A-01 INVITED     [Abstracts]
TI: Chemical Loss of Polar Ozone: Present Understanding and Remaining Uncertainties
AU: * Salawitch, R J
EM: Ross.Salawitch@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Drive Drive M.S. 183-601, Pasadena, CA 91109 United States
AU: Canty, T
A22A-01 AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Drive Drive M.S. 183-601, Pasadena, CA 91109 United States
AU: Cunnold, D
A22A-01 AF: Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA 30332 United States
AU: Dorf, M
A22A-01 AF: University of Heidelberg, Institute of Environmental Physics Im Neuenheimer Feld 229, Heidelberg, D-69120 Germany
AU: Frieler, K
A22A-01 AF: Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A43, Potsdam, D-14473 Germany
AU: Godin-Beekman, S
A22A-01 AF: Service d'Aeronomie - CNRS, UPMC-Boite 102-4 Place Jussieu 75252 Cedex 05, Paris, 75252 France
AU: Newchurch, M J
A22A-01 AF: University of Alabama in Hunstville, Atmospheric Science Department, Hunstville, AL 35805 United States
AU: Pfeilsticker, K
A22A-01 AF: University of Heidelberg, Institute of Environmental Physics Im Neuenheimer Feld 229, Heidelberg, D-69120 Germany
AU: Rex, M
A22A-01 AF: Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A43, Potsdam, D-14473 Germany
AU: Stimpfle, R M
A22A-01 AF: Harvard University, Deprtment of Chemistry and Chemical Biology 12 Oxford St., Cambridge, MA 02138 United States
AU: Streibel, M
A22A-01 AF: University of Cambridge, European Ozone Research Coordinating Unit 14 Union Road, Cambridge, CB2 1EW United Kingdom
AU: von der Gathen, P
A22A-01 AF: Alfred Wegener Institute for Polar and Marine Research, Telegrafenberg A43, Potsdam, D-14473 Germany
AU: Weisenstein, D K
A22A-01 AF: Atmospheric and Environmental Research, Inc, 131 Hartwell Ave., Lexington, MA 02421 United States
AU: Yang, E
A22A-01 AF: Georgia Institute of Technology, School of Earth and Atmospheric Sciences, Atlanta, GA 30332 United States
AB: Not long after the discovery of the Antarctic ozone hole, it was established that halogen compounds, supplied to the atmosphere mainly by anthropogenic activities, are the primary driver of polar ozone loss. We will briefly review the chemical mechanisms that cause polar ozone loss and the early evidence showing the key role played by anthropogenic halogens. Recently, stratospheric halogen loading has leveled off, due to adherence to the Montreal Protocol and its amendments that has essentially banned CFCs (chlorofluorocarbons) and other halocarbons. We will describe recent reports of the first stage of recovery of the Antarctic ozone hole (e.g., a statistically significant slowing of the downward trend), associated with the leveling off of stratospheric halogens. Despite this degree of understanding, we will discuss the tendency of photochemical models to underestimate the observed rate of polar ozone loss and a hypothesis that has recently been put forth that might resolve this discrepancy. Finally, we will briefly discuss chemical loss of Arctic ozone, which also involves anthropogenic halogens but is governed primarily by year-to-year variability in stratospheric temperature.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0317 Chemical kinetic and photochemical properties
DE: 0340 Middle atmosphere: composition and chemistry
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005