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An update on ozone profile trends for the period 2000 to 2016

Wolfgang Steinbrecht 1 Lucien Froidevaux 2 Ryan Fuller 2 Ray Wang 3 John Anderson 4 Chris Roth 5 Adam Bourassa 5 Doug Degenstein 5 Robert Damadeo 6 Joseph Zawodny 6 Stacey Frith 7, 8 Richard Mcpeters 8 Pawan Bhartia 8 Jeannette Wild 9, 10 Craig Long 9 Sean Davis 11, 12 Karen Rosenlof 12 Viktoria Sofieva 13 Kaley Walker 14 Nabiz Rahpoe 15 Alexei Rozanov 15 Mark Weber 15 Alexandra Laeng 16 Thomas von Clarmann 16 Gabriele Stiller 16 Natalya Kramarova 8, 7 Sophie Godin-Beekmann 17 Thierry Leblanc 2 Richard Querel 18 Daan Swart 19 Ian Boyd 20 Klemens Hocke 21, 22 Niklaus Kämpfer 22 Eliane Maillard Barras 23 Lorena Moreira 21, 22 Gerald Nedoluha 24 Corinne Vigouroux 25 Thomas Blumenstock 26 Matthias Schneider 26 Omaira Garcìa 27 Nicholas Jones 28 Emmanuel Mahieu 29 Dan Smale 18 Michael Kotkamp 18 John Robinson 18 Irina Petropavlovskikh 30, 11 Neil Harris 31 Birgit Hassler 32 Daan Hubert 25 Fiona Tummon 33 
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : Ozone profile trends over the period 2000 to 2016 from several merged satellite ozone data sets and from ground-based data by four techniques at stations of the Network for the Detection of Atmospheric Composition Change indicate significant ozone increases in the upper stratosphere, between 35 and 48 km altitude (5 and 1 hPa). Near 2 hPa (42 km), ozone has been increasing by about 1.5 % per decade in the tropics (20° S to 20° N), and by 2 to 2.5 % per decade in the 35° to 60° latitude bands of both hemispheres. At levels below 35 km (5 hPa), 2000 to 2016 ozone trends are smaller and not statistically significant. The observed trend profiles are consistent with expectations from chemistry climate model simulations. Using three to four more years of observations and updated data sets, this study confirms positive trends of upper stratospheric ozone already reported, e.g., in the WMO/UNEP Ozone Assessment 2014, or by Harris et al. (2015). The additional years, and the fact that nearly all individual data sets indicate these increases, give enhanced confidence. Nevertheless, a thorough analysis of possible drifts and differences between various data sources is still required, as is a detailed attribution of the observed increases to declining ozone depleting substances and to stratospheric cooling. Ongoing quality observations from multiple independent platforms are key for verifying that recovery of the ozone layer continues as expected.
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Wolfgang Steinbrecht, Lucien Froidevaux, Ryan Fuller, Ray Wang, John Anderson, et al.. An update on ozone profile trends for the period 2000 to 2016. Atmospheric Chemistry and Physics, European Geosciences Union, 2017, 17 (17), pp.10675-10690. ⟨10.5194/acp-17-10675-2017⟩. ⟨insu-01517245⟩



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