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Discussion papers
https://doi.org/10.5194/acp-2019-1144
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-1144
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 29 Jan 2020

Submitted as: research article | 29 Jan 2020

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This preprint is currently under review for the journal ACP.

Seasonal stratospheric ozone trends over 2000–2018 derived from several merged data sets

Monika E. Szeląg1, Viktoria F. Sofieva1, Doug Degenstein2, Chris Roth2, Sean Davis3, and Lucien Froidevaux4 Monika E. Szeląg et al.
  • 1Finnish Meteorological Institute, Helsinki, Finland
  • 2University of Saskatchewan, Canada
  • 3NOAA Earth System Research Laboratory Chemical Sciences Division, Boulder, CO, USA
  • 4Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California, USA

Abstract. In this work, we analyse the seasonal dependence of ozone trends in the stratosphere using four long-term merged datasets: SAGE-CCI-OMPS, SAGE-OSIRIS-OMPS, GOZCARDS and SWOOSH which provide more than 30 years of monthly zonal mean ozone profiles in the stratosphere. We focus here on trends between 2000 and 2018. All datasets show similar results, although some discrepancies are observed. In the upper stratosphere, the trends are positive throughout all seasons and the majority of latitudes. The largest upper stratospheric ozone trends are observed during local winter (up to 6 % dec−1) and equinox (up to 3 % dec−1) at mid-latitudes. In the equatorial region, we find a very strong seasonal dependence of ozone trends at all altitudes: the trends vary from positive to negative, with the sign of transition depending on altitude and season. The trends are negative in the upper stratospheric winter (−1 to −2 % dec−1) and in the lower stratospheric spring (−2 to −4 % dec−1), but positive (2–3 % dec−1) at 30–35 km in spring, while the opposite pattern is observed in summer. The tropical trends below 25 km are negative and maximize during summer (up to −2 % dec−1) and spring (up to −3 % dec−1). In the lower mid-latitude stratosphere, our analysis indicates hemispheric asymmetry: during local summers and equinoxes, positive trends are observed in the South (+1 to +2 % dec−1) while negative trends are observed in the North (−1 to −2 % dec−1).

We compare the seasonal dependence of ozone trends with available analyses of the seasonal dependence of stratospheric temperature trends. We find that ozone and temperature trends show positive correlation in the dynamically controlled lower stratosphere, and negative correlation above 30 km, where photochemistry dominates.

Seasonal trend analysis gives information beyond that contained in annual mean trends, which can be helpful in order to better understand the role of dynamical variability in short-term trends and future ozone recovery predictions.

Monika E. Szeląg et al.

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Monika E. Szeląg et al.

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Short summary
We analyse seasonal dependence of stratospheric ozone trends over 2000–2018. We demonstrate that the mid-latitude upper stratospheric ozone recovery maximises during local winters and equinoxes. In the tropics, a very strong seasonal dependence of ozone trends is observed at all altitudes. We found hemispheric asymmetry of summer-time ozone trend patterns below 35 km. The seasonal dependence of ozone trends and stratospheric temperature trends shows a clear inter-relation of the trend patterns.
We analyse seasonal dependence of stratospheric ozone trends over 2000–2018. We demonstrate that...
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