09 Sep 2020

09 Sep 2020

Review status: this preprint is currently under review for the journal ESSD.

A Global Total Column Ozone Climate Data Record

Greg E. Bodeker1,2, Jan Nitzbon1,3, Jordis S. Tradowsky1, Stefanie Kremser1, Alexander Schwertheim1, and Jared Lewis1 Greg E. Bodeker et al.
  • 1Bodeker Scientific, 42 Russell Street, Alexandra, 9320, New Zealand
  • 2School of Geography, Environment and Earth Sciences, Victoria University of Wellington, New Zealand
  • 3Permafrost Research Section, Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research, Potsdam, Germany

Abstract. Total column ozone (TCO) data from multiple satellite-based instruments have been combined to create a single near-global daily time series of ozone fields at 1.25° longitude by 1° latitude spanning the period 31 October 1978 to 31 December 2016. Comparisons against TCO measurements from the ground-based Dobson and Brewer spectrophotometer networks are used to remove offsets and drifts between the ground-based measurements and a subset of the satellite-based measurements. The corrected subset is then used as a basis for homogenising the remaining data sets. The construction of this database improves on earlier versions of the database maintained first by the National Institute of Water and Atmospheric Research (NIWA) and now by Bodeker Scientific (BS), referred to as the NIWA-BS TCO database. The intention is that the NIWA-BS TCO database serves as a climate data record for TCO and, to this end, the requirements for constructing climate data records, as detailed by GCOS (the Global Climate Observing System) have been followed as closely as possible. This new version includes a wider range of satellite-based instruments, uses updated sources of satellite data, extends the period covered, uses improved statistical methods to model the difference fields when homogenising the data sets, and, perhaps most importantly, robustly tracks uncertainties from the source data sets through to the final climate data record which is now accompanied by associated uncertainty fields. Furthermore, a gap-free TCO database (referred to as the BS-filled TCO database) has been created and is documented in this paper. The utility of the NIWA-BS TCO database is demon strated through an analysis of ozone trends from November 1978 to December 2016. Both databases are freely available for non-commercial purposes: the doi for the NIWA-BS TCO database is 10.5281/zenodo.1346424 (Bodeker et al., 2018) and is available from The doi for the BS-filled TCO database is 10.5281/zenodo.3908787 (Bodeker et al., 2020) and is available from In addition, both data sets are available from

Greg E. Bodeker et al.

Status: final response (author comments only)
Status: final response (author comments only)
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Greg E. Bodeker et al.

Data sets

BS Filled Total Column Ozone Database Bodeker, G.E., Kremser, S. and Tradowsky, J.S.

NIWA-BS Total Column Ozone Database Bodeker, G.E., Nitzbon, J., Lewis, J., Schwertheim, A., Tradowsky, J.S. and Kremser, S.

Greg E. Bodeker et al.


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Short summary
Ozone in Earth's atmosphere has undergone significant changes since first measured systematically from space in the late 1970s. The purpose of the paper is to present a new, spatially filled, global total column ozone climate data record spanning October 1978 to December 2016. The database is compiled from measurements from 17 different satellite-based instruments where offsets and drifts between the instruments have been corrected using ground-based measurements.