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https://doi.org/10.5194/acp-2020-1095
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2020-1095
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  17 Nov 2020

17 Nov 2020

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This preprint is currently under review for the journal ACP.

Indicators of Antarctic ozone depletion: 1979 to 2019

Greg E. Bodeker1,2 and Stefanie Kremser1 Greg E. Bodeker and Stefanie Kremser
  • 1Bodeker Scientific, 42 Russell Street, Alexandra, 9320, New Zealand
  • 2School of Geography, Environment and Earth Sciences, Victoria University of Wellington, New Zealand

Abstract. The National Institute of Water and Atmospheric Research/Bodeker Scientific (NIWA-BS) total column ozone (TCO) database, and the associated BS-filled TCO database, have been updated to cover the period 1979 to 2019, bringing both to version 3.5.1 (V3.5.1). The BS-filled database builds on the NIWA-BS database by using a machine-learning algorithm to fill spatial and temporal data gaps to provide gap-free TCO fields over Antarctic. These filled TCO fields then provide a more complete picture of winter-time changes in the ozone layer over Antarctica. The BS-filled database has been used to calculate continuous, homogeneous time series of indicators of Antarctic ozone depletion from 1979 to 2019, including (i) daily values of the ozone mass deficit based on TCO below a 220 DU threshold, (ii) daily measures of the area over Antarctica where TCO levels are below 150 DU, below 220 DU, more than 30 % below 1979 to 1981 climatological means, and more than 50 % below 1979 to 1981 climatological means, (iii) the date of disappearance of 150 DU TCO values, 220 DU TCO values, values 30 % or more below 1979 to 1981 climatological means, and values 50 % or more below 1979 to 1981 climatological means, for each year, and (iv) daily minimum TCO values over the range 75° S to 90° S equivalent latitude. Since both the NIWA-BS and BS-filled databases provide uncertainties on every TCO value, the Antarctic ozone depletion metrics are provided, for the first time, with fully traceable uncertainties. To gain insight into how the vertical distribution of ozone over Antarctica has changed over the past 36 years, ozone concentrations, combined and homogenized from several satellite-based ozone monitoring instruments as well as the global ozonesonde network, were also analysed. A robust attribution to changes in the drivers of long-term secular variability in these metrics has not been performed in this analysis. As a result, statements about the recovery of Antarctic TCO from the effects of ozone depleting substances cannot be made. That said, there are clear indications of a change in trend in many of the metrics reported on here around the turn of the century, close to when Antarctic stratospheric concentrations of chlorine and bromine peaked.

Greg E. Bodeker and Stefanie Kremser

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Greg E. Bodeker and Stefanie Kremser

Data sets

NIWA-BS Total Column Ozone Database Greg E. Bodeker, Jan Nitzbon, Jared Lewis, Alexander Schwertheim, Jordis S. Tradowsky, and Stefanie Kremser https://doi.org/10.5281/zenodo.1346424

BS Filled Total Column Ozone Database Greg E. Bodeker, Stefanie Kremser, and Jordis S. Tradowsky https://doi.org/10.5281/zenodo.3908787

Greg E. Bodeker and Stefanie Kremser

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Short summary
This paper presents measures of the severity of the Antarctic ozone hole covering the period 1979 to 2019. The paper shows that while the severity of Antarctic ozone depletion grew rapidly through the last two decades of the 20th century, the severity declined thereafter, and faster than expected from declines in stratospheric concentrations of the chlorine and bromine containing chemical compounds that destroy ozone.
This paper presents measures of the severity of the Antarctic ozone hole covering the period...
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