References

ACP

Atmospheric Chemistry and Physics

ACP

Atmos. Chem. Phys.

1680-7324

Copernicus Publications

Göttingen, Germany

10.5194/acp-15-3021-2015

Intercomparison of vertically resolved merged satellite ozone data sets: interannual variability and long-term trends

Tummon

¹ Hassler

https://orcid.org/0000-0003-2724-709X

² ³ Harris

N. R. P.

https://orcid.org/0000-0003-1256-3006

⁴ Staehelin

https://orcid.org/0000-0001-7861-1889

¹ Steinbrecht

https://orcid.org/0000-0003-0680-6729

⁵ Anderson

⁶ Bodeker

G. E.

https://orcid.org/0000-0003-1094-5852

⁷ Bourassa

⁸ Davis

S. M.

https://orcid.org/0000-0001-9276-6158

² ³ Degenstein

⁸ Frith

S. M.

⁹ Froidevaux

¹⁰ Kyrölä

https://orcid.org/0000-0001-9197-9549

¹¹ Laine

https://orcid.org/0000-0002-5914-6747

¹¹ Long

¹² Penckwitt

A. A.

⁷ Sioris

C. E.

⁸ Rosenlof

K. H.

https://orcid.org/0000-0002-0903-8270

³ Roth

https://orcid.org/0000-0002-0805-4578

⁸ Wang

H.-J.

¹³ Wild

¹² ¹⁴

ETH Zurich, Zurich, Switzerland

Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA

Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, Colorado, USA

University of Cambridge, Chemistry Department, Cambridge, UK

Deutscher Wetterdienst, Hohenpeissenberg, Germany

Department of Atmospheric and Planetary Science, Hampton University, Hampton, Virginia, USA

Bodeker Scientific, Alexandra, New Zealand

Institute of Space and Atmospheric Studies, University of Saskatchewan, Saskatoon, Saskatchewan, Canada

Science Systems and Applications, Inc., Lanham, Maryland, USA

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

Finnish Meteorological Institute, Helsinki, Finland

NOAA/NWS/NCEP/Climate Prediction Center, College Park, Maryland, USA

Georgia Institute of Technology, Atlanta, Georgia, USA

Innovim, Greenbelt, Maryland, USA

17 03 2015

15 6 3021 3043

2015

This work is licensed under the Creative Commons Attribution 3.0 Unported License. To view a copy of this licence, visit https://creativecommons.org/licenses/by/3.0/

This article is available from https://acp.copernicus.org/articles/15/3021/2015/acp-15-3021-2015.html

The full text article is available as a PDF file from https://acp.copernicus.org/articles/15/3021/2015/acp-15-3021-2015.pdf

In the framework of the SI2N (SPARC (Stratosphere-troposphere Processes And their Role in Climate)/IO3C (International Ozone Commission)/IGACO-O3 (Integrated Global Atmospheric Chemistry Observations – Ozone)/NDACC (Network for the Detection of Atmospheric Composition Change)) initiative, several long-term vertically resolved merged ozone data sets produced from satellite measurements have been analysed and compared. This paper presents an overview of the methods, assumptions, and challenges involved in constructing such merged data sets, as well as the first thorough intercomparison of seven new long-term satellite data sets. The analysis focuses on the representation of the annual cycle, interannual variability, and long-term trends for the period 1984–2011, which is common to all data sets. Overall, the best agreement amongst data sets is seen in the mid-latitude lower and middle stratosphere, with larger differences in the equatorial lower stratosphere and the upper stratosphere globally. In most cases, differences in the choice of underlying instrument records that were merged produced larger differences between data sets than the use of different merging techniques. Long-term ozone trends were calculated for the period 1984–2011 using a piecewise linear regression with a change in trend prescribed at the end of 1997. For the 1984–1997 period, trends tend to be most similar between data sets (with largest negative trends ranging from −4 to −8% decade−1 in the mid-latitude upper stratosphere), in large part due to the fact that most data sets are predominantly (or only) based on the SAGE-II record. Trends in the middle and lower stratosphere are much smaller, and, particularly for the lower stratosphere, large uncertainties remain. For the later period (1998–2011), trends vary to a greater extent, ranging from approximately −1 to +5% decade−1 in the upper stratosphere. Again, middle and lower stratospheric trends are smaller and for most data sets not significantly different from zero. Overall, however, there is a clear shift from mostly negative to mostly positive trends between the two periods over much of the profile.

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