Atmospheric Chemistry and Physics, vol. 12, issue 5 (2012) pp. 2603-2614
A large zonal asymmetry of ozone has been observed over Antarctica
during winter-spring, when the ozone hole develops. It is caused by a
planetary wave-driven displacement of the polar vortex. The total ozone
data by OMI (Ozone Monitoring Instrument) and the ozone profiles by MLS
(Microwave Limb Sounder) and GOMOS (Global Ozone Monitoring by
Occultation of Stars) were analysed to characterize the ozone zonal
asymmetry and the wave activity during Antarctic spring. Both total
ozone and profile data have shown a persistent zonal asymmetry over the
last years, which is usually observed from September to mid-December.
The largest amplitudes of planetary waves at 65A degrees S (the
perturbations can achieve up to 50% of zonal mean values) is observed
in October. The wave activity is dominated by the quasi-stationary wave
1 component, while the wave 2 is mainly an eastward travelling wave.
Wave numbers 1 and 2 generally explain more than the 90% of the ozone
longitudinal variations. Both GOMOS and MLS ozone profile data show that
ozone zonal asymmetry covers the whole stratosphere and extends up to
the altitudes of 60-65 km. The wave amplitudes in ozone mixing ratio
decay with altitude, with maxima (up to 50%) below 30 km.
The characterization of the ozone zonal asymmetry has become important
in the climate research. The inclusion of the polar zonal asymmetry in
the climate models is essential for an accurate estimation of the future
temperature trends. This information might also be important for
retrieval algorithms that rely on ozone a priori information.
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