HR: 0800h
AN: A51D-0813    [Abstracts]
TI: Observed versus Modeled Arctic Ozone Loss during the 2002-2003 Winter
AU: * Singleton, C S
EM: shaw@lasp.colorado.edu
AF: Laboratory for Atmospheric Space Physics, University of Colorado UCB 392, Boulder, CO 80309-0392 United States
AU: Randall, C E
EM: randall@lasp.colorado.edu
AF: Laboratory for Atmospheric Space Physics, University of Colorado UCB 392, Boulder, CO 80309-0392 United States
AU: Harvey, V L
EM: harvey@lasp.colorado.edu
AF: Laboratory for Atmospheric Space Physics, University of Colorado UCB 392, Boulder, CO 80309-0392 United States
AU: Chipperfield, M P
EM: martyn@env.leeds.ac.uk
AF: Institute of Atmospheric Science University of Leeds, LS2, Leeds, UK 9JT
AU: Davies, S
EM: stewart@env.leeds.ac.uk
AF: Institute of Atmospheric Science University of Leeds, LS2, Leeds, UK 9JT
AU: Kinnison, D E
EM: dkin@ucar.edu
AF: National Center for Atmospheric Research, P.O. Box 3000, Boulder, CO 80307-3000 United States
AU: Bevilacqua, R M
EM: bevilacqua@nrl.navy.mil
AF: Naval Research Laboratory, Code 7220, Washington, DC 20375-5320 United States
AU: Manney, G L
EM: manney@mls.jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109 United States
AU: Manney, G L
EM: manney@mls.jpl.nasa.gov
AF: New Mexico Highlands University, Department of Natural Sciences, Las Vegas, NM 87701 United States
AU: Hoppel, K W
AF: Naval Research Laboratory, Code 7220, Washington, DC 20375-5320 United States
AU: Feng, W
EM: feng@env.leeds.ac.uk
AF: Institute of Atmospheric Science University of Leeds, LS2, Leeds, UK 9JT
AB: In the work presented here, results from the MOZART and SLIMCAT global three-dimensional chemical transport models(CTMs) are used to infer chemical ozone loss from Polar Ozone and Aerosol Measurement (POAM) III observations of stratospheric ozone during the 2002-2003 Arctic winter. Comparisons between observed ozone loss, loss inferred from model simulations, and theoretical estimates will be shown along with possible explanations for the differences. As the abundances of ozone-destroying chemicals decrease, accurately quantifying polar ozone loss is key to predicting the timing of ozone recovery. In spite of numerous investigations, numerical models routinely underestimate ozone loss in the lower polar stratosphere. Modeling discrepancies arise due to the inadequate representation of both chemical (i.e.dentrification, chlorine activation, and the sensitivity of ozone loss at high solar zenith angles) and dynamical (sub-grid scale mixing) processes. Comparisons between relevant chemical species and dynamical quantities will be used to understand the differences between observed and modeled ozone loss rates. Trajectory simulations will also be used to explore differences between ozone loss due to chemistry versus vertical and horizontal transport.
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: 2004 AGU Fall Meeting