Abstract
Abstract. Stratospheric ozone profile measurements from the Stratospheric Aerosol and Gas Experiment~(SAGE) II satellite instrument (1984–2005) are combined with those from the Optical Spectrograph and InfraRed Imager System (OSIRIS) instrument on the Odin satellite (2001–Present) to quantify interannual variability and decadal trends in stratospheric ozone between 60° S and 60° N. These data are merged into a multi-instrument, long-term stratospheric ozone record (1984–present) by analyzing the measurements during the overlap period of 2002–2005 when both satellite instruments were operational. The variability in the deseasonalized time series is fit using multiple linear regression with predictor basis functions including the quasi-biennial oscillation, El Niño–Southern Oscillation index, solar activity proxy, and the pressure at the tropical tropopause, in addition to two linear trends (one before and one after 1997), from which the decadal trends in ozone are derived. From 1984 to 1997, there are statistically significant negative trends of 5–10% per decade throughout the stratosphere between approximately 30 and 50 km. From 1997 to present, a statistically significant recovery of 3–8% per decade has taken place throughout most of the stratosphere with the notable exception between 40° S and 40° N below approximately 22 km where the negative trend continues. The recovery is not significant between 25 and 35 km altitudes when accounting for a conservative estimate of instrument drift.
Highlights
The variability of stratospheric ozone and the trends observed in past decades continue to be of importance for understanding the future evolution of ozone and its interaction with changing climate
These results derived from the merged Stratospheric Aerosol and Gas Experiment (SAGE) II–Optical Spectrograph and InfraRed Imaging System (OSIRIS) data agree in general with the results from the SAGE II– Global Ozone Monitoring by Occultation of Stars (GOMOS) time series analysis performed by Kyrölä et al, 2013
The asymmetry in the recovery in our result is not in the GOMOS result and the magnitude of the recovery is not as high as we find with the OSIRIS data set
Summary
The variability of stratospheric ozone and the trends observed in past decades continue to be of importance for understanding the future evolution of ozone and its interaction with changing climate. Several recent studies have highlighted the need for high-quality, altitude-resolved profile measurements to quantify the different aspects of atmospheric variability and trends throughout the global stratosphere. One of the key data sets in many past studies is that of ozone profile measurements made by the Stratospheric Aerosol and Gas (SAGE) II satellite instrument, which obtained high-quality, vertical profiles of the global stratosphere by solar occultation from 1984 to 2005. The goal of this paper is twofold: to demonstrate the feasibility of merging the SAGE II and OSIRIS ozone measurements into a single time series through comparative analysis of the two time series and, secondly, to use the merged time series to quantify interannual variability and trends in stratospheric ozone from 1984 to 2013 over the latitude range 60◦ S–60◦ N. This work follows directly from the recent results of Sioris et al, 2013, who analyzed the SAGE II and OSIRIS time series in the tropical lower stratosphere only
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