Energetic particle induced intra-seasonal variability of ozone inside the Antarctic polar vortex observed in satellite data
2014
Measurements from 2002 to 2011 by three inde-
pendent satellite instruments, namely MIPAS, SABER, and
SMR on board the ENVISAT, TIMED, and Odin satellites
are used to investigate the intra-seasonal variability of strato-
spheric and mesospheric O3 volume mixing ratio (vmr) in-
side the Antarctic polar vortex due to solar and geomagnetic
activity. In this study, we individually analysed the relative
O3 vmr variations between maximum and minimum condi-
tions of a number of solar and geomagnetic indices (F10.7
cm solar radio flux, Ap index, ≥2 MeV electron flux). The
indices are 26-day averages centred at 1 April, 1 May, and
1 June while O3 is based on 26-day running means from
1 April to 1 November at altitudes from 20 to 70 km. Dur-
ing solar quiet time from 2005 to 2010, the composite of
all three instruments reveals an apparent negative O3 sig-
nal associated to the geomagnetic activity (Ap index) around
1 April, on average reaching amplitudes between −5 and
−10 % of the respective O3 background. The O3 response
exceeds the significance level of 95 % and propagates down-
wards throughout the polar winter from the stratopause down
to ∼ 25 km. These observed results are in good qualitative
agreement with the O3 vmr pattern simulated with a three-
dimensional chemistry-transport model, which includes par-
ticle impact ionisation.
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