EGU2020-3571, updated on 01 Dec 2021
EGU General Assembly 2020
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.

Total ozone loss during the 2019/20 Arctic winter and comparison to previous years

Florence Goutail1, Jean-Pierre Pommereau1, Andrea Pazmino1, Franck Lefevre1, Cathy Clerbaux1, Anne Boynard1, Juliette Hadji-Lazaro1, Martyn Chipperfield2, Wuhu Feng2, Michel Van Roozendael3, Nis Jepsen4, Georg Hansen5, Rigel Kivi6, Kristof Bognar7, Kimberly Strong7, and Kaley Walker7
Florence Goutail et al.
  • 1LATMOS/CNRS/UVSQ, Guyancourt, France (
  • 2Institute of Atmospheric Science, School of Earth and Environment, University of Leeds, Leeds, UK,
  • 3Belgian Institute for Space Aeronomy (BIRA), Brussels, Belgium,
  • 4Danish Meteorological Institute, Copenhagen, Denmark,
  • 5Norwegian Institute for Air Research, Kjeller, Norway,
  • 6Finnish Meteorological Institute, Sodankylä, Finland,
  • 7Department of Physics, University of Toronto, Toronto, Canada.

The amplitude of ozone depletion in the Arctic is monitored every year since 1990 by comparison between total ozone measurements of SAOZ / NDACC UV-Vis spectrometers deployed in the Arctic and 3-D chemical transport model simulations in which ozone is considered as a passive tracer.

When SAOZ measurements are missing for various reasons, lack of sunlight, station closed or instrument failure, they are replaced since 2017 by IASI/Metop overpasses above the station. These measurements in the thermal Infrared are available all year around, at all latitudes even in the polar night. IASI data have been compared to SAOZ and to 3-D CTM REPROBUS and the agreement is better than 3% at the latitude of the polar circle.

The method allows determining the evolution of the daily rate of the ozone destruction and the amplitude of the cumulative loss at the end of the winter. The amplitude of the destruction varies between 0-10% in relatively warm and short vortex duration years up to 25-39% in colder and longer ones.

Since a strong and large vortex centred at the North Pole, PSCs and activated chlorine are still present at all levels in the lower stratosphere on January 9, 2020, there is a good probability that a significant O3 loss may happen in 2020. But since, as shown by the unprecedented depletion of 39% in 2010/11, the loss depends on the vortex duration, strength and possible re-noxification, it is difficult to predict in advance the amplitude of the cumulative loss at the end of the winter.

Shown in this presentation will be the evolution of ozone loss and re-noxification in the Arctic vortex during the winter 2019/20 compared to previous winters and REPROBUS and SLIMCAT CTM simulations.

How to cite: Goutail, F., Pommereau, J.-P., Pazmino, A., Lefevre, F., Clerbaux, C., Boynard, A., Hadji-Lazaro, J., Chipperfield, M., Feng, W., Van Roozendael, M., Jepsen, N., Hansen, G., Kivi, R., Bognar, K., Strong, K., and Walker, K.: Total ozone loss during the 2019/20 Arctic winter and comparison to previous years, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-3571,, 2020.


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displays version 1 – uploaded on 02 May 2020
  • CC1: Comment on EGU2020-3571, Sören Johansson, 04 May 2020

    Hi Florence,
    sorry, I missed the chat time of your display due to technical problems (I guess the server was too busy), so I post my question here: On Slide 7, you compare measurements of the ozone sonde from Sodankyla to the passive ozone of the model. Did you also compare to "active" ozone of the model? This might be interesting to get an idea of how well the model reproduces the measurement (in case the ozone depleting processes are well captured in the model).


    • AC1: How reprobus is simulating the sonde, Florence Goutail, 04 May 2020

      thanks for your comment

      Reprobus is doing a nice job (I have levelled the sonde by 300m)

      I will try to upload the plot in another reply!!!!!!

    • AC2: Reply to CC1, Florence Goutail, 04 May 2020

      • CC2: Reply to AC2, Sören Johansson, 04 May 2020

        Thanks a lot for your answer and the new figure! It's a bit hard to see everything, but that's probably due to image limitations by the platform here...
        So for me it looks like the model matches the sonde very well in the middle stratosphere, but not really in the UTLS region. But of course your work focusses on the region of the ozone maximum, so your model demonstrated to work well there. Thanks again!