Preprints
https://doi.org/10.5194/amt-2022-7
https://doi.org/10.5194/amt-2022-7

  12 Jan 2022

12 Jan 2022

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

Homogenization of the Observatoire de Haute Provence ECC ozonesonde data record: comparison with lidar and satellite observations

Gérard Ancellet1, Sophie Godin-Beekmann1, Herman G. J. Smit2, Ryan M. Stauffer3, Roeland Van Malderen4, Renaud Bodichon5, and Andrea Pazmiño1 Gérard Ancellet et al.
  • 1LATMOS, Sorbonne Université, Université Versailles St-Quentin, CNRS/INSU, Paris, France
  • 2Forschungszentrum Jülich IEK-8, Jülich, Germany
  • 3NASA Goddard Space Flight Center, Atmospheric Chemistry and Dynamics Lab, Greenbelt, Md, USA
  • 4Royal Meteorological Institute, Uccle, Belgium
  • 5IPSL, Sorbonne Université, Université Versailles St-Quentin, CNRS/INSU, Paris, France

Abstract. The Observatoire de Haute Provence (OHP) weekly Electrochemical Concentration Cell (ECC) ozonesonde data have been homogenized for the time period 1991–2020 according to the recommendations of the Ozonesonde Data Quality Assessment (O3S-DQA) panel. The assessment of the ECC homogenization benefit has been carried out using comparisons with ground based instruments also measuring ozone at the same station (lidar, surface measurements) and with collocated satellite observations of the O3 vertical profile by Microwave Limb Sounder (MLS). The major differences between uncorrected and homogenized ECC are related to a change of ozonesonde type in 1997, removal of the pressure dependency of the ECC background current and correction of internal ozonesonde temperature. The 3–4 ppbv positive bias between ECC and lidar in the troposphere is corrected with the homogenization. The ECC 30-years trends of the seasonally adjusted ozone concentrations are also significantly improved both in the troposphere and the stratosphere when the ECC concentrations are homogenized, as shown by the ECC/lidar or ECC/surface ozone trend comparisons. A −0.29 % per year negative trend of the normalization factor (NT) calculated using independent measurements of the total ozone column (TOC) at OHP disappears after homogenization of the ECC. There is however a remaining −5 % negative bias in the TOC which is likely related to an underestimate of the ECC concentrations in the stratosphere above 50 hPa as shown by direct comparison with the OHP lidar and MLS. The reason for this bias is still unclear, but a possible explanation might be related to freezing or evaporation of the sonde solution in the stratosphere. Both the comparisons with lidar and satellite observations suggest that homogenization increases the negative bias of the ECC up to 10 % above 28 km.

Gérard Ancellet et al.

Status: open (until 17 Feb 2022)

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Gérard Ancellet et al.

Data sets

Tropospheric and stratospheric O3 profiles data using ECC ozonesonde measurements at the OHP G. Ancellet https://doi.org/10.25326/293

Gérard Ancellet et al.

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Short summary
The 1991–2020 Observatoire de Haute Provence Electrochemical Concentration Cell (ECC) ozonesonde data have been homogenized according to the recommendations of the Ozonesonde Data Quality Assessment panel. Comparisons with ground based instruments also measuring ozone at the same station (lidar, surface measurements) and with collocated satellite observations show the benefits of this homogenization. Remaining differences between ECC and other observations in the stratosphere are also discussed.