Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 16 2009 10.5194/acp-9-6055-2009 http://www.atmos-chem-phys.net/9/6055/2009/ http://www.atmos-chem-phys.net/9/6055/2009/acp-9-6055-2009.html http://www.atmos-chem-phys.net/9/6055/2009/acp-9-6055-2009.pdf 6055 6075 2009-08-20 Evolution of stratospheric ozone and water vapour time series studied with satellite measurements A. Jones ashley@rss.chalmers.se J. Urban D. P. Murtagh P. Eriksson S. Brohede C. Haley D. Degenstein A. Bourassa C. von Savigny T. Sonkaew A. Rozanov H. Bovensmann J. Burrows Department of Radio and Space Science, Chalmers University of Technology, Gothenburg, Sweden Department of Earth and Atmospheric Sciences, York University, Toronto, Canada University of Saskatchewan, Saskatoon, Canada Institute of Environmental Physics, University of Bremen, Germany The long term evolution of stratospheric ozone and water vapour has been investigated by extending satellite time series to April 2008. For ozone, we examine monthly average ozone values from various satellite data sets for nine latitude and altitude bins covering 60° S to 60° N and 20–45 km and covering the time period of 1979–2008. Data are from the Stratospheric Aerosol and Gas Experiment (SAGE I+II), the HALogen Occultation Experiment (HALOE), the Solar BackscatterUltraViolet-2 (SBUV/2) instrument, the Sub-Millimetre Radiometer (SMR), the Optical Spectrograph InfraRed Imager System (OSIRIS), and the SCanning Imaging Absorption spectroMeter for Atmospheric CHartograpY (SCIAMACHY). Monthly ozone anomalies are calculated by utilising a linear regression model, which also models the solar, quasi-biennial oscillation (QBO), and seasonal cycle contributions. Individual instrument ozone anomalies are combined producing an all instrument average. Assuming a turning point of 1997 and that the all instrument average is represented by good instrumental long term stability, the largest statistically significant ozone declines (at two sigma) from 1979–1997 are seen at the mid-latitudes between 35 and 45 km, namely −7.2%±0.9%/decade in the Northern Hemisphere and −7.1%±0.9%/in the Southern Hemisphere. Furthermore, for the period 1997 to 2008 we find that the same locations show the largest ozone recovery (+1.4% and +0.8%/decade respectively) compared to other global regions, although the estimated trend model errors indicate that the trend estimates are not significantly different from a zero trend at the 2 sigma level. An all instrument average is also constructed from water vapour anomalies during 1991–2008, using the SAGE II, HALOE, SMR, and the Microwave Limb Sounder (Aura/MLS) measurements. 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