HR: 08:15h
AN: A31B-02    [PDF]
TI: Large-Scale Equatorward Transport of Ozone in the Subtropical Lower Stratosphere
AU: * Richard, E C
EM: richard@al.noaa.gov
AF: CIRES-University of Colorado, Boulder, UCB 216, Boulder, CO 80309 United States
AU: Aikin, K C
EM: aikin@al.noaa.gov
AF: CIRES-University of Colorado, Boulder, UCB 216, Boulder, CO 80309 United States
AU: Ray, E A
EM: eray@al.noaa.gov
AF: CIRES-University of Colorado, Boulder, UCB 216, Boulder, CO 80309 United States
AU: Rosenlof, K H
EM: rosenlof@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Thompson, T L
EM: tlt@al.noaa.gov
AF: NOAA Aeronomy Laboratory, 325 Broadway, Boulder, CO 80305 United States
AU: Weinheimer, A
EM: wein@ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305 United States
AU: Montzka, D
EM: montzka@acd.ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305 United States
AU: Knapp, D
EM: david@acd.ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305 United States
AU: Ridley, B
EM: ridley@acd.ucar.edu
AF: Atmospheric Chemistry Division, National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305 United States
AU: Gettelman, A
EM: andrew@ucar.edu
AF: National Center for Atmospheric Research, 1850 Table Mesa Drive, Boulder, CO 80305 United States
AB: Anomalous vertical profiles of ozone were observed in the sub-tropical lower stratosphere (near South Florida) in July 2002 during the NASA sponsored Cirrus Regional Study of Tropical Anvils and Cirrus Layers - Florida Area Cirrus Experiment (CRYSTAL-FACE) measurement campaign. It is shown that there is an enhancement of ozone (initially $>$ 150 %) above the tropopause extending up to 410 K potential temperature. This ozone increase is the result of recent transport of mid and high latitude lower stratospheric air into the sub-tropics. This meridional transport was a consequence of a geostrophic flow pattern established by a quasi-stationary anticyclone centered over the South-central US that persisted for much of July 2002. We show the spatial and temporal extent of meridional isentropic transport into the sub-tropics by examining the ozone vertical profiles in combination with the O3:NOy correlations as well as isentropic back trajectory calculations. The anomalous ozone profiles are also reproduced in a global chemical transport model.
DE: 0300 ATMOSPHERIC COMPOSITION AND STRUCTURE
DE: 0340 Middle atmosphere--composition and chemistry
DE: 0341 Middle atmosphere--constituent transport and chemistry (3334)
SC: Atmospheric Sciences [A]
MN: 2003 Fall Meeting