Atmos. Chem. Phys. Discuss., 13, 20239-20274, 2013
© Author(s) 2013. This work is distributed
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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.
Decadal-scale responses in middle and upper stratospheric ozone from SAGE II Version 7 data
E. E. Remsberg
NASA Langley Research Center, 21 Langley Blvd., Mail Stop 401B, Hampton, VA 23681, USA

Abstract. Stratospheric Aerosol and Gas Experiment (SAGE II) version 7 (v7) ozone profiles are analyzed for their decadal-scale responses and linear trends in the middle and upper stratosphere for the two periods of 1984 to 1998 and 1991 to 2005. Multiple linear regression (MLR) analysis is applied to time series of the v7 ozone number density vs. altitude data for a range of latitudes and altitudes. The MLR models that are fit to the data include a periodic 11 yr term, and it is in-phase with that of the 11-yr, solar uv-flux throughout most of the latitude/altitude domain of the middle and upper stratosphere. Max minus min, solar cycle (SC-like) responses for the SAGE II ozone at those altitudes and for the low to middle latitudes are similar for 1984–1998 and for 1991–2005 and of the order of 5 to 2.5% from 35 to 50 km. This finding is important because the associated linear trend terms are clearly different from the MLR models of those two time spans. The SAGE II results for the upper stratosphere are also compared with those of the Halogen Occultation Experiment (HALOE) in terms of mixing ratio vs. pressure. The shapes of their respective, SC-like response profiles agree well for a time series from late 1992–2005, or after excluding the first 14 months of data following the Pinatubo eruption. Max minus min, SC-like responses from the SAGE II and HALOE time series vary from 2 to 4% and from 0 to 2%, respectively, and their differences in the upper stratosphere can be accounted for using the analyzed, SC-like response of the HALOE temperatures. The linear ozone trends of the upper stratosphere for 1992–2005 vary from about 0 to −4% decade−1 from the Southern to the Northern Hemisphere from SAGE II, while they vary from 0 to −2% decade−1 and are more nearly symmetric about the Equator from HALOE.

Citation: Remsberg, E. E.: Decadal-scale responses in middle and upper stratospheric ozone from SAGE II Version 7 data, Atmos. Chem. Phys. Discuss., 13, 20239-20274, doi:10.5194/acpd-13-20239-2013, 2013.
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