Atmos. Chem. Phys. Discuss., 13, 16661-16697, 2013
www.atmos-chem-phys-discuss.net/13/16661/2013/
doi:10.5194/acpd-13-16661-2013
© Author(s) 2013. This work is distributed
under the Creative Commons Attribution 3.0 License.
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This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). Please refer to the corresponding final paper in ACP.
Trend and variability in ozone in the tropical lower stratosphere over 2.5 solar cycles observed by SAGE II and OSIRIS
C. E. Sioris1, C. A. McLinden2, V. E. Fioletov2, C. Adams1, J. M. Zawodny3, A. E. Bourassa1, and D. A. Degenstein1
1Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
2Environment Canada, Toronto, Ontario, Canada
3NASA Langley Research Center, Hampton, Virginia, USA

Abstract. We are able to replicate previously reported decadal trends in the tropical lower stratospheric ozone anomaly based on Stratospheric Aerosol and Gas Experiment II observations. We have extended the satellite-based ozone anomaly time series to the present (December 2012) by merging SAGE II with OSIRIS (Optical Spectrograph and Infrared Imager System) and correcting for the small bias (~0.5%) between them, determined using their temporal overlap of 4 yr. Analysis of the merged dataset (1984–2012) shows a statistically significant negative trend at all altitudes in the 18–25 km range reaching (−6.5 ± 1.8)% decade−1 at 18.5 km, with underlying strong variations due to El Niño–Southern Oscillation, the Quasi–Biennial Oscillation, and tropopause height.

Citation: Sioris, C. E., McLinden, C. A., Fioletov, V. E., Adams, C., Zawodny, J. M., Bourassa, A. E., and Degenstein, D. A.: Trend and variability in ozone in the tropical lower stratosphere over 2.5 solar cycles observed by SAGE II and OSIRIS, Atmos. Chem. Phys. Discuss., 13, 16661-16697, doi:10.5194/acpd-13-16661-2013, 2013.
 
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