energetic particle induced intra-seasonal variability of ozone inside the antarctic polar vortex observed in satellite data
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2015
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Abstract
Measurements from 2002 to 2011 by three independent satellite instruments,
namely MIPAS, SABER, and SMR on board the ENVISAT, TIMED, and Odin satellites
are used to investigate the intra-seasonal variability of stratospheric and
mesospheric O3 volume mixing ratio (vmr) inside 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
conditions 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.
During solar quiet time from 2005 to 2010, the composite of all three
instruments reveals an apparent negative O3 signal 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 downwards 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 particle impact ionisation.
| Reference Key |
fytterer2015atmosphericenergetic
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|---|---|
| Authors | ;T. Fytterer;M. G. Mlynczak;H. Nieder;K. Pérot;M. Sinnhuber;G. Stiller;J. Urban |
| Journal | Journal of agricultural and food chemistry |
| Year | 2015 |
| DOI |
10.5194/acp-15-3327-2015
|
| URL | |
| Keywords |
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