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JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 95, NO. D10, PAGES 16,529–16,543, 1990

Evolution of the total ozone field during the breakdown of the Antarctic circumpolar vortex

Kenneth P. Bowman

Department of Atmospheric Sciences, University of Illinois at Urbana-Champaign, Urbana


Abstract

Nine years of total ozone measurements from the Total Ozone Mapping Spectrometer (TOMS) on Nimbus 7 are used to study the evolution of the southern hemisphere total ozone field during the breakdown of the Antarctic circumpolar vortex. The TOMS data provide detailed maps of the morphology of the ozone field and reliable estimates of the vertically integrated meridional transport of ozone during the springtime period when the breakdown occurs (September, October, November). In estimating the ozone transport, chemical effects, including those thought to be responsible for the Antarctic ozone hole, are neglected. This approximation appears to be valid for times scales of a few days to a week. On this time scale, local ozone changes are primarily due to transport. Planetary-scale waves, especially zonal wave numbers 1 and 2 dominate the eddy variance and ozone transport. Wave number 1 is quasistationary, while wave number 2 is eastward moving with a period of ∼10 days. Before the breakdown the planetary-scale waves transport ozone poleward (equatorward) as their amplitude increases (decreases). During the vortex breakdown and filling of the ozone hole, when poleward ozone transport is large, planetary wave amplitudes generally decrease. © American Geophysical Union 1990

Index Terms: 0365 Atmospheric Composition and Structure: Troposphere—composition and chemistry.

Citation: Bowman, K. P. (1990), Evolution of the total ozone field during the breakdown of the Antarctic circumpolar vortex, J. Geophys. Res., 95(D10), 16,529–16,543.