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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 8, 3923-3940, 2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
24 Sep 2015
The GOME-type Total Ozone Essential Climate Variable (GTO-ECV) data record from the ESA Climate Change Initiative
M. Coldewey-Egbers1, D. G. Loyola1, M. Koukouli2, D. Balis2, J.-C. Lambert3, T. Verhoelst3, J. Granville3, M. van Roozendael3, C. Lerot3, R. Spurr4, S. M. Frith5, and C. Zehner6 1German Aerospace Center (DLR), Wessling, Germany
2Aristotle University of Thessaloniki (AUTH), Thessaloniki, Greece
3Belgian Institute for Space Aeronomy (BIRA), Brussels, Belgium
4RT Solutions Inc., Cambridge, Massachusetts, USA
5Science Systems and Applications Inc., National Aeronautics and Space Administration/Goddard Space Flight Center (NASA/GSFC), Greenbelt, Maryland, USA
6European Space Agency/European Space Research Institute (ESA/ESRIN), Frascati, Italy
Abstract. We present the new GOME-type Total Ozone Essential Climate Variable (GTO-ECV) data record which has been created within the framework of the European Space Agency's Climate Change Initiative (ESA-CCI). Total ozone column observations – based on the GOME-type Direct Fitting version 3 algorithm – from GOME (Global Ozone Monitoring Experiment), SCIAMACHY (SCanning Imaging Absorption SpectroMeter for Atmospheric CHartographY), and GOME-2 have been combined into one homogeneous time series, thereby taking advantage of the high inter-sensor consistency. The data record spans the 15-year period from March 1996 to June 2011 and it contains global monthly mean total ozone columns on a 1°× 1° grid. Geophysical ground-based validation using Brewer, Dobson, and UV–visible instruments has shown that the GTO-ECV level 3 data record is of the same high quality as the equivalent individual level 2 data products that constitute it. Both absolute agreement and long-term stability are excellent with respect to the ground-based data, for almost all latitudes apart from a few outliers which are mostly due to sampling differences between the level 2 and level 3 data. We conclude that the GTO-ECV data record is valuable for a variety of climate applications such as the long-term monitoring of the past evolution of the ozone layer, trend analysis and the evaluation of chemistry–climate model simulations.

Citation: Coldewey-Egbers, M., Loyola, D. G., Koukouli, M., Balis, D., Lambert, J.-C., Verhoelst, T., Granville, J., van Roozendael, M., Lerot, C., Spurr, R., Frith, S. M., and Zehner, C.: The GOME-type Total Ozone Essential Climate Variable (GTO-ECV) data record from the ESA Climate Change Initiative, Atmos. Meas. Tech., 8, 3923-3940,, 2015.
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