• April 2020 - Unprecedented low Arctic ozone in March 2020 (see Figure below).
  • December 2018 WMO/UNEP Scientific Ozone Assessment 2018 is published with contributions from UVSAT (M. Weber as Chapter Review Editor ("Global stratospheric ozone: Past, present, and future") and contributing author ("Polar stratospheric ozone: Past, present, and future"), John P. Burrows as reviewer)
  • September 2017 - Publication of a  Nature paper and peer-review article on ozone recovery commemorating 30 years since signing the Montreal Protocol on phasing out ozone depleting substances


March 2020 total ozone

Unprecedented very low total ozone was observed above the Arctic in March 2020. In this Arctic winter the stratospheric polar vortex (a stratospheric cyclone) was very strong and large, exhibiting very cold temperatures. Such cold temperature lead to large chemical ozone depletion that are simiilar to ozone losses seen in the ozone hole above Antarctica. This figure shows the total ozone from S5P/TROPOMI in March 2020 (top) and for comparison in March 2019 (middle). In 2019 polar stratospheric temperatures were much higher. The data from both years very nicely demonstrate the large year-to-year variability observed in Arctic spring time. Differences between both years were as high as 200 DU (blueish color) as shown in the bottom panel. The total ozone data was derived from TROPOMI using our retrieval algorithms.


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