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Stratospheric Aerosol and Gas Experiment (SAGE II)Version 6.2 ozone profiles are analyzed for their decadal-scale responses inthe middle and upper stratosphere from September 1991 to August 2005. Theprofile data are averaged within twelve, 20°-wide latitude bins from55° S to 55° N and at twelve altitudes from 27.5 to 55.0 km. Theseparate, 14-yr data time series are analyzed using multiple linearregression (MLR) models that include seasonal, 28 and 21-month, 11-yrsinusoid, and linear trend terms. Proxies are not used for the 28-mo(QBO-like), 11-yr solar uv-flux, or reactive chlorine terms. Instead, thepresent analysis focuses on the periodic 11-yr terms to see whether they arein-phase with that of a direct, uv-flux forcing or are dominated by someother decadal-scale influence. It is shown that they are in-phase over mostof the latitude/altitude domain and that they have max minus min variationsbetween 25° S and 25° N that peak near 4% between 30 and 40 km.Model simulations of the direct effects of uv-flux forcings agree with thisfinding. The shape of the 11-yr ozone response profile from SAGE II alsoagrees with that diagnosed for the stratosphere over the same time periodfrom the HALOE data. Ozone in the middle stratosphere of the northernsubtropics is perturbed during 1991−1992 following the eruption of Pinatubo,and there are pronounced decadal-scale variations in the ozone of the upperstratosphere for the northern middle latitudes presumably due to dynamicalforcings. The 11-yr ozone responses of the southern hemisphere appear to befree of those extra influences. The associated linear trend terms from theSAGE II analyses are slightly negative (−2 to −4%/decade) between 35 and45 km and nearly constant across latitude. This finding is consistent withthe fact that ozone is estimated to have decreased by no more than 1.5%due to the increasing chlorine from mid-1992 to about 2000 but with littlechange thereafter. It is concluded that a satellite, solar occultationmeasurement provides both the signal sensitivity and the vertical resolutionto record the stratospheric ozone response to the forcing from the solaruv-flux, as well as those due to any other long-term changes

Analysis of SAGE II ozone of the middle and upper stratosphere for its response to a decadal-scale forcing