An update on ozone profile trends for the period 2000 to 2016
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Published:2017-09-11
Issue:17
Volume:17
Page:10675-10690
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Steinbrecht WolfgangORCID, Froidevaux Lucien, Fuller Ryan, Wang RayORCID, Anderson John, Roth Chris, Bourassa Adam, Degenstein Doug, Damadeo RobertORCID, Zawodny Joe, Frith Stacey, McPeters Richard, Bhartia Pawan, Wild Jeannette, Long Craig, Davis SeanORCID, Rosenlof KarenORCID, Sofieva ViktoriaORCID, Walker KaleyORCID, Rahpoe NabizORCID, Rozanov Alexei, Weber MarkORCID, Laeng Alexandra, von Clarmann Thomas, Stiller GabrieleORCID, Kramarova NatalyaORCID, Godin-Beekmann Sophie, Leblanc Thierry, Querel RichardORCID, Swart DaanORCID, Boyd Ian, Hocke KlemensORCID, Kämpfer Niklaus, Maillard Barras ElianeORCID, Moreira LorenaORCID, Nedoluha Gerald, Vigouroux Corinne, Blumenstock Thomas, Schneider MatthiasORCID, García Omaira, Jones Nicholas, Mahieu EmmanuelORCID, Smale DanORCID, Kotkamp Michael, Robinson John, Petropavlovskikh IrinaORCID, Harris NeilORCID, Hassler BirgitORCID, Hubert DaanORCID, Tummon Fiona
Abstract
Abstract. Ozone profile trends over the period 2000 to 2016 from several merged satellite ozone data sets and from ground-based data measured 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. 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). Compared to those studies, three to four additional years of observations, updated and improved data sets with reduced drift, and the fact that nearly all individual data sets indicate ozone increase in the upper stratosphere, all give enhanced confidence. Uncertainties have been reduced, for example for the trend near 2 hPa in the 35 to 60° latitude bands from about ±5 % (2σ) in Harris et al. (2015) to less than ±2 % (2σ). 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.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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